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  • 1.
    Brorsson, Sofia
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Bio- och miljösystemforskning (BLESS), Biomekanik och biomedicin.
    Lundgren, Lina
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Bio- och miljösystemforskning (BLESS).
    Olsson, Charlotte
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Bio- och miljösystemforskning (BLESS).
    Ett fysiologiskt perspektiv på fysisk aktivitet och hälsa2010Ingår i: Hälsa & Livsstil: forskning och praktiska tillämpningar / [ed] Lillemor R-M Hallberg, Lund: Studentlitteratur, 2010, 1, s. 87-112Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 2.
    Farley, Oliver R. L.
    et al.
    School of Exercise and Health Science, Edith Cowan University, Joondalup, Australia & Hurley Surfing Australia High Performance Center, Casuarina Beach, New South Wales, Australia & SPRINZ, Auckland University of Technology, Auckland, New Zealand.
    Secomb, Josh L.
    School of Exercise and Health Science, Edith Cowan University, Joondalup, Australia & Hurley Surfing Australia High Performance Center, Casuarina Beach, New South Wales, Australia & Queensland Academy of Sport, Brisbane, Australia.
    Raymond, Ellen
    Hurley Surfing Australia High Performance Center, Casuarina Beach, New South Wales, Australia & Department for Health, University of Bath, Bath, United Kingdom.
    Lundgren, Lina
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS). School of Exercise and Health Science, Edith Cowan University, Joondalup, Australia & Hurley Surfing Australia High Performance Center, Casuarina Beach, New South Wales, Australia.
    Ferrier, Brendon
    School of Exercise and Health Science, Edith Cowan University, Joondalup, Australia & England School of Applied Sciences, Edinburgh Napier University, Edinburgh, United Kingdom.
    Abbiss, Chris R.
    School of Exercise and Health Science, Edith Cowan University, Joondalup, Australia.
    Sheppard, Jeremy
    School of Exercise and Health Science, Edith Cowan University, Joondalup, Australia & Hurley Surfing Australia High Performance Center, Casuarina Beach, New South Wales, Australia & Canadian Sport Institute, Pacific Region, Richmond, British Columbia, Canada.
    Workloads of Competitive Surfing: Work-to-Relief Ratios, Surf-Break Demands, and Updated Analysis2018Ingår i: Journal of Strength and Conditioning Research, ISSN 1064-8011, E-ISSN 1533-4287, Vol. 32, nr 10, s. 2939-2948Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The study provides an in-depth descriptive and quantitative time-motion analysis of competitive surfing, using Global Positioning System (GPS) units and video synchronization, which serves to extend upon the results of Farley, Harris, and Kilding (Journal of Strength and Conditioning Research, 26, 7 [2012]). In addition, comparisons between locations and surfers competing in the same heats were performed. Global Positioning System and video data were collected from 41 male competitive surfers (23.2 ± 6.1 years, 71 ± 10.3 kg, 177.2 ± 6.4 cm) participating in 3 professional domestic surfing events, with competitive heats of 20-minute duration. Fifty data sets were analyzed across the 3 competitions, with velocities and distances covered, proportion of time spent performing various surfing activities, and total work-to-relief ratio determined. Results revealed surfers paddled 44% of the total time, followed by stationary periods (42%). Surfers performed at a significantly (p ≤ 0.05) higher work-to-relief ratio (1.7:1) at the beach-break (an exposed beach) compared with point-break 1 and 2 (waves breaking around a rocky point). Point-breaks 1 and 2 had longer continuous durations of paddling, with significantly longer rides at point-break 1 over the beach-break (p ≤ 0.01) and point-break 2 (p ≤ 0.01). The average maximal speed (24.8 km·h−1) from point-break 2 was significantly faster than point-break 1 (p ≤ 0.01) and beach-break (p ≤ 0.05). This information should influence surfing drills and conditioning methods to prepare these athletes for the disparate demands, such as training for a point-break competition involving longer durations of continuous paddling and short, high-intensity workloads for a beach-break. © 2018 National Strength and Conditioning Association

  • 3.
    Farley, Oliver R.L.
    et al.
    School of Exercise and Health Science, Edith Cowan University, Joondalup, Western Australia, Australia & Hurley Surfing Australia High Performance Center, Casuarina Beach, New South Wales, Australia & SPRINZ, Auckland University of Technology, Auckland, New Zealand.
    Secomb, Josh L.
    School of Exercise and Health Science, Edith Cowan University, Joondalup, Western Australia, Australia & Hurley Surfing Australia High Performance Center, Casuarina Beach, New South Wales, Australia & Queensland Academy of Sport, Brisbane, Queensland, Australia.
    Raymond, Ellen R.
    Hurley Surfing Australia High Performance Center, Casuarina Beach, New South Wales, Australia & Department for Health, University of Bath, Bath, United Kingdom.
    Lundgren, Lina E.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS). School of Exercise and Health Science, Edith Cowan University, Joondalup, Western Australia, Australia & Hurley Surfing Australia High Performance Center, Casuarina Beach, New South Wales, Australia.
    Ferrier, Brendon K.
    School of Exercise and Health Science, Edith Cowan University, Joondalup, Western Australia, Australia & England School of Applied Sciences, Edinburgh Napier University, Edinburgh, Scotland, United Kingdom.
    Abbiss, Chris R.
    School of Exercise and Health Science, Edith Cowan University, Joondalup, Western Australia, Australia.
    Sheppard, Jeremy M.
    School of Exercise and Health Science, Edith Cowan University, Joondalup, Western Australia, Australia & Hurley Surfing Australia High Performance Center, Casuarina Beach, New South Wales, Australia & Canadian Sport Institute, Pacific Region, Richmond, British Columbia, Canada.
    Workloads of Competitive Surfing: Work-to-Relief Ratios, Surf-Break Demands, and Updated Analysis2018Ingår i: Journal of Strength and Conditioning Research, ISSN 1064-8011, E-ISSN 1533-4287, Vol. 32, nr 10, s. 2939-2948Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The study provides an in-depth descriptive and quantitative time-motion analysis of competitive surfing, using Global Positioning System (GPS) units and video synchronization, which serves to extend upon the results of Farley, Harris, and Kilding (Journal of Strength and Conditioning Research, 26, 7 [2012]). In addition, comparisons between locations and surfers competing in the same heats were performed. Global Positioning System and video data were collected from 41 male competitive surfers (23.2 6 6.1 years, 71 6 10.3 kg, 177.2 6 6.4 cm) participating in 3 professional domestic surfing events, with competitive heats of 20-minute duration. Fifty data sets were analyzed across the 3 competitions, with velocities and distances covered, proportion of time spent performing various surfing activities, and total work-to-relief ratio determined. Results revealed surfers paddled 44% of the total time, followed by stationary periods (42%). Surfers performed at a significantly (p < 0.05) higher work-to- relief ratio (1.7:1) at the Beach-break (an exposed beach) com- pared with point-break 1 and 2 (waves breaking around a rocky point). Point-breaks 1 and 2 had longer continuous durations of paddling, with significantly longer rides at point-break 1 over the Beach-break (p < 0.01) and point-break 2 (p < 0.01). The average maximal speed (24.8 km/h) from point-break 2 was significantly faster than point-break 1 (p < 0.01) and Beach- break (p < 0.05). This information should influence surfing drills and conditioning methods to prepare these athletes for the dis- parate demands, such as training for a point-break competition involving longer durations of continuous paddling and short, high-intensity workloads for a Beach-break. 

  • 4.
    Khan, Taha
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Lundgren, Lina
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Anderson, David G.
    Donald Gordon Brain and Mind Centre, Johannesburg, South Africa & School of Electrical and Information Engineering, University of the Witwatersrand, Johannesburg, South Africa.
    Novak, Irena
    Aquatic Rehabilitation Center, University of Johannesburg, Johannesburg, South Africa.
    Dougherty, Mark
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Verikas, Antanas
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Pavel, Misha
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Jimison, Holly
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Nowaczyk, Sławomir
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Aharonson, Vered
    School of Electrical and Information Engineering, University of the Witwatersrand, Johannesburg, South Africa.
    Assessing Parkinson's disease severity using speech analysis in non-native speakers2019Ingår i: Computer speech & language (Print), ISSN 0885-2308, E-ISSN 1095-8363, artikel-id 101047Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background: Speech disorder is a common manifestation of Parkinson's disease with two main symptoms, dysprosody and dysphonia. Previous research studying objective measures of speech symptoms involved patients and examiners who were native language speakers. Measures such as cepstral separation difference (CSD) features to quantify dysphonia and dysprosody accurately distinguish the severity of speech impairment. Importantly CSD, together with other speech features, including Mel-frequency coefficients, fundamental-frequency variation, and spectral dynamics, characterize speech intelligibility in PD. However, non-native language speakers transfer phonological rules of their mother language that tamper speech assessment.

    Objectives: This paper explores CSD's capability: first, to quantify dysprosody and dysphonia of non-native language speakers, Parkinson patients and controls, and secondly, to characterize the severity of speech impairment when Parkinson's dysprosody accompanies non-native linguistic dysprosody.

    Methods: CSD features were extracted from 168 speech samples recorded from 19 healthy controls, 15 rehabilitated and 23 not-rehabilitated Parkinson patients in three different clinical speech tests based on Unified Parkinson's disease rating scale motor-speech examination. Statistical analyses were performed to compare groups using analysis of variance, intraclass correlation, and Guttman correlation coefficient µ2. Random forests were trained to classify the severity of speech impairment using CSD and the other speech features. Feature importance in classification was determined using permutation importance score.

    Results: Results showed that the CSD feature describing dysphonia was uninfluenced by non-native accents, strongly correlated with the clinical examination (µ2>0.5), and significantly discriminated between the healthy, rehabilitated, and not-rehabilitated patient groups based on the severity of speech symptoms. However, the feature describing dysprosody did not correlate with the clinical examination but significantly distinguished the groups. The classification model based on random forests and selected features characterized the severity of speech impairment of non-native language speakers with high accuracy. Importantly, the permutation importance score of the CSD feature representing dysphonia was the highest compared to other features. Results showed a strong negative correlation (µ2<-0.5) between L-dopa administration and the CSD features.

    Conclusions: Although non-native accents reduce speech intelligibility, the CSD features can accurately characterize speech impairment, which is not always possible in the clinical examination. Findings support using CSD for monitoring Parkinson's disease.

    © 2019 Elsevier Ltd. All rights reserved.

  • 5.
    Khan, Taha
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Lundgren, Lina
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS). Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Järpe, Eric
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Olsson, M. Charlotte
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Wiberg, Pelle
    Raytelligence AB, Halmstad, Sweden.
    A Novel Method for Classification of Running Fatigue Using Change-Point Segmentation2019Ingår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 19, nr 21, artikel-id 4729Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Blood lactate accumulation is a crucial fatigue indicator during sports training. Previous studies have predicted cycling fatigue using surface-electromyography (sEMG) to non-invasively estimate lactate concentration in blood. This study used sEMG to predict muscle fatigue while running and proposes a novel method for the automatic classification of running fatigue based on sEMG. Data were acquired from 12 runners during an incremental treadmill running-test using sEMG sensors placed on the vastus-lateralis, vastus-medialis, biceps-femoris, semitendinosus, and gastrocnemius muscles of the right and left legs. Blood lactate samples of each runner were collected every two minutes during the test. A change-point segmentation algorithm labeled each sample with a class of fatigue level as (1) aerobic, (2) anaerobic, or (3) recovery. Three separate random forest models were trained to classify fatigue using 36 frequency, 51 time-domain, and 36 time-event sEMG features. The models were optimized using a forward sequential feature elimination algorithm. Results showed that the random forest trained using distributive power frequency of the sEMG signal of the vastus-lateralis muscle alone could classify fatigue with high accuracy. Importantly for this feature, group-mean ranks were significantly different (p < 0.01) between fatigue classes. Findings support using this model for monitoring fatigue levels during running. © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

  • 6.
    Lundgren, Lina
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Bio- och miljösystemforskning (BLESS).
    System analysis of kitesurfing: Understanding performance and injury risk for on-water board sports2011Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Board sports are examples of sports where the interaction of the task, environment and the athlete are essential. As for other sports, there are injuries and other issues associated with these sports, which affect performance and that can be avoided by proper preparation and well- designed equipment. By focusing on kitesurfing as a system structure the complex interactions between factors can help reveal which variables that are of interest to study to increase the level of performance and safety. Lack of research on the board sport kitesurfing makes this area interesting to study regarding performance and musculoskeletal problems. The purpose of this licentiate thesis was to further the understanding of on-water board sports, and specifically study kitesurfing by using a system analysis to structure factors that influence performance and injury risk for this board sport. The specific aims were:

    To reveal the most common self-reported injuries related to kitesurfing and their causes (Paper I).

    To evaluate in which body parts participants perceive musculoskeletal stress, pain and discomfort related to the performance of kitesurfing (Paper II).

    To identify usability problems related to the preparation of kitesurfing equipment (Paper III).

    To provide a system analysis to describe the relations between and identify characteristics that influence performance and injury risk of kitesurfing.

    Methods used for these studies were hierarchical task analysis, observations (n=8), web- questionnaires (n=206), interviews (n=17) and a focus group (n=7). The system analysis was executed in six steps and based on ideas adopted from general systems theory, dynamical systems and ecological task analysis. Tasks performed in freestyle kitesurfing consist of riding a board and performing jumps and tricks, whereof the latter have sub-tasks involving take-off, acrobatic air movements and landings. Within the system of kitesurfing, there are the sub-systems athlete, kite system, board system and harness/protection. There are also external factors acting upon the system. All sub- systems have characteristics that are less changeable during execution of the task and which effect on the athlete can be represented by identified output measures, i.e. harness line force, board reaction force, steering force, pressure distribution, movement patterns, body temperature, fatigue level, comfort and pain, choice of sub-task, mood, stress level, concentration, motivation, experience and usability. The results show that the most frequent locations for injury are in the lower extremities, i.e. knee and ankle, and that about 50% of the injuries reported were associated with jumps and tricks. Equipment and environmental factors also contribute to injuries, as well as to musculoskeletal stress, pain and discomfort. The abdominal muscles were most frequently reported as exposed to high musculoskeletal stress, but also thighs and lower back were perceived as highly stressed throughout the tasks. Knees and feet were areas described as sometimes painful, especially in combination with landings from tricks or strong winds.

    Furthermore, the lower back was reported painful when kitesurfing in strong winds. When hooking out from the harness for performing tricks, the shoulders were perceived as highly stressed. Before the execution of on-water kitesurfing starts, the preparation of the kite system must be accomplished. The results from Study III showed that there are usability problems related to this kitesurfing task, meaning risk for use error to arise. If use errors occur, serious consequences can follow later in the process. The results emphasize improvement of the products from a usability perspective. Some of the identified output measures were partly answered from the results of Papers I-III, where numbers of injuries, perceived musculoskeletal stress, pain and discomfort, and usability issues were evaluated for kitesurfing. The structure motives the need for further research within the area of on-water board sports and reveals variables that are affecting the system.

  • 7.
    Lundgren, Lina
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS), Biomekanik och biomedicin.
    Bligård, Lars-Ola
    Division of Design & Human Factors, Chalmers University of Technology, Gothenburg.
    Brorsson, Sofia
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS), Biomekanik och biomedicin.
    Osvalder, Anna-Lisa
    Division of Design & Human Factors, Chalmers University of Technology, Gothenburg.
    Implementation of usability analysis to detect problems in the management of kitesurfing equipment2011Ingår i: Procedia Engineering, ISSN 1877-7058, E-ISSN 1877-7058, Vol. 13, s. 525-530Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Equipment used for high-risk sports, such as kitesurfing, needs to be efficient for the intended use and the user, and thus meet the mechanical demands and provide sufficient safety. Accidents related to kitesurfing occur, and the consequences are sometimes catastrophic. One important factor is the equipment design, which can influence the type and number of injuries due to insufficient safety systems. The aim of this study was to investigate how the design of kitesurfing equipment can affect safety issues from a usability perspective in relation to the task of preparation. A focus group of 6 subjects analyzed the task of preparing kitesurfing equipment for riding, using the evaluation methods Enhanced Cognitive Walkthrough (ECW) and Predictive Use Error Analysis (PUEA). From the evaluation, a list of plausible usability problems was identified together with proposed design guidelines. The results showed that usability problems occur during preparation. In total 35 usability problems were found, of which 11 (4 from ECW and 7 from PUEA) have a great impact on safety. These 11 problems were hard to detect for the user and could result in serious consequences for the kitesurfers during rideing. The analysis resulted in some general guidelines that are possible to implement on different types of kites. To conclude, education and improved design of the equipment are essential to increase the safety of the sport.

  • 8.
    Lundgren, Lina
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Bio- och miljösystemforskning (BLESS), Biomekanik och biomedicin.
    Brorsson, Sofia
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Bio- och miljösystemforskning (BLESS), Biomekanik och biomedicin.
    Observational analysis of body position while kitesurfing2009Konferensbidrag (Refereegranskat)
  • 9.
    Lundgren, Lina
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS).
    Brorsson, Sofia
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS).
    Hilliges, Marita
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS).
    Osvalder, Anna-Lisa
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS). Chalmers University of Technology, Gothenburg, Sweden.
    Sport performance and perceived musculoskeletal stress, pain and discomfort in kitesurfing2011Ingår i: International Journal of Performance Analysis in Sport, ISSN 1474-8185, E-ISSN 1474-8185, Vol. 11, nr 1, s. 142-158Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The purpose of this study was to obtain an overview of the specific movement patterns in kitesurfing, and the participants' perceptions of musculoskeletal stress, pain and discomfort. Task analysis and survey studies were used to provide an overview of the sport, and to identify problematic issues associated with the performance of the tasks. Three different methods were complimentary used for data collection: observations (n=8), a web questionnaire (n=206) and interviews (n=17). Participants were contacted through kitesurfing events and online forums. Their ages ranged from 16-62 years. The results showed that participants experienced high musculoskeletal stress for short times during a session (jumps, tricks and strong winds), and lower, static musculoskeletal stress over a longer time (crossing). High stress was most frequently perceived in abdominal muscles. Knees and feet were the sites most frequently experienced as painful, followed by the shoulders and elbows. This study provides additional information on the performance of kitesurfing and perceived musculoskeletal stress, pain and discomfort. The results can be used as input data to develop training methods and equipment for safe and comfortable performance. © 2017, Routledge. All rights reserved.

  • 10.
    Lundgren, Lina
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS), Biomekanik och biomedicin.
    Brorsson, Sofia
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS), Biomekanik och biomedicin.
    Osvalder, Anna-Lisa
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS).
    Comfort aspects important for the performance and safety of kitesurfing2012Ingår i: Work: A journal of Prevention, Assesment and rehabilitation, ISSN 1051-9815, E-ISSN 1875-9270, Vol. 41, nr Suppl. 1, s. 1221-1225Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Equipment used in sports is of great importance, especially when the equipment is in direct contact with the athlete or is important for safety. In the sport kitesurfing environmental factors and the equipment design are crucial for the comfort and safety. The participants’ choice and opinion of equipment can show which factors are considered most important for the performance and to reduce risk for injury. This study has evaluated self-reported information from the participants about what equipment they use, comfort of the equipment and if the equipment has contributed to any injuries. The methods used were questionnaires (n=206) and interviews (n=17), which in combination allows to assess the problem both quantitatively and qualitatively. The results showed that supported leading edge kites are most frequently used, with a waist harness and foot straps to attach the feet. The choice of kite type was mainly based on the discipline of riding for the respondent. Some issues concerning comfort of riding and injury risk the respondents did relate to the design of harness and foot straps. The information from this study can be used for development strategies for industry manufacturers and for further studies in the area of equipment design and biomechanics. © 2012 - IOS Press and the authors. All rights reserved.

  • 11.
    Lundgren, Lina
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS), Biomekanik och biomedicin.
    Brorsson, Sofia
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS), Biomekanik och biomedicin.
    Osvalder, Anna-Lisa
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS), Biomekanik och biomedicin.
    Injuries related to kitesurfing2011Ingår i: World Academy of Science, Engineering and Technology, ISSN 2010-3778, nr 77, s. 1132-1136Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Participation in sporting activities can lead to injury. Sport injuries have been widely studied in many sports including the more extreme categories of aquatic board sports. Kitesurfing is a relatively new water surface action sport, and has not yet been widely studied in terms of injuries and stress on the body. The aim of this study was to get information about which injuries that are most common among kitesurfing practitioners, where they occur, and their causes. Injuries were studied using an international open web questionnaire (n=206). The results showed that many respondents reported injuries, in total 251 injuries to knee (24%), ankle (17%), trunk (16%) and shoulders (10%), often sustained while doing jumps and tricks (40%). Among the reported injuries were joint injuries (n=101), muscle/tendon damages (n=47), wounds and cuts (n=36) and bone fractures (n=28). Also environmental factors and equipment can influence the risk of injury, or the extent of injury in a hazardous situation. Conclusively, the information from this retrospective study supports earlier studies in terms of prevalence and site of injuries. Suggestively, this information should be used for to build a foundation of knowledge about the sport for development of applications for physical training and product development.

  • 12.
    Lundgren, Lina
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Bio- och miljösystemforskning (BLESS).
    Olandersson, Sofia
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), PRODEA: Centrum för produktframtagning inom hälsoteknik.
    Hilliges, Marita
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), PRODEA: Centrum för produktframtagning inom hälsoteknik.
    Osvalder, Anna-Lisa
    Department of Product- and Production Development, Division of Design Chalmers University of Technology.
    Biomechanics of extreme sports - a kite surfing scenario2007Ingår i: NES2007 Abstracts / [ed] Cecilia Berlin & Lars-Ola Bligård, Nordic Ergonomics Society , 2007, s. s.169-Konferensbidrag (Refereegranskat)
    Abstract [en]

    Do extreme sports contribute to higher biomechanical stress compared to other sports? Kite surfing is one of the upcoming popular extreme sports,where very few have studied the mechanical forces that act on the body. There are several factors that contribute to mechanical stress. For preventing injuries, it is of high interest to investigate how these forces affect the body and how the equipment can be further developed to prepare the athletes for making the sport as safe as possible. This project will study injury prevalence, motion analysis and mapping of forces and pressure during kite surfing. The outcome will be a better understanding of biomechanics of kite surfing and a construction for testing and training as well as ergonomic design ideas for the equipment.

  • 13.
    Lundgren, Lina
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Zügner, Roland
    Gothenburg University, Gothenburg, Sweden.
    Tranberg, Roy
    Gothenburg University, Gothenburg, Sweden.
    Brorsson, Sofia
    Karolinska Institute, Stockholm, Sweden.
    Osvalder, Anna-Lisa
    Chalmers University of Technology, Gothenburg, Sweden.
    Effect of stance width on kinematics of laboratory landings with fixed feet on a kiteboard2017Konferensbidrag (Refereegranskat)
  • 14.
    Lundgren, Lina
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS), Biomekanik och biomedicin.
    Zügner, Roland
    Sahlgrenska University Hospital, Gothenburg, Sweden.
    Tranberg, Roy
    Sahlgrenska University Hospital, Gothenburg, Sweden.
    Osvalder, Anna-Lisa
    Chalmers University of Technology, Gothenburg, Sweden.
    Brorsson, Sofia
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS).
    Normalizing stance width2012Ingår i: Neuroplasticity, Motor control, Cutting-Edge Technology & Rehabilitation: Proceedings of the XIXth Congress of the International Society of Electrophysiology & Kinesiology / [ed] Kylie Tucker, Bianca Butler and Paul W Hodges, Brisbane: NHMRC Centre of Clinical Research Excellence in Spinal Pain, Injury and Health , 2012, s. 221-221Konferensbidrag (Refereegranskat)
    Abstract [en]

    INTRODUCTION: In previous studies, stance widths are most often determined as a percentage of shoulder width, where 70% of shoulder width is considered a narrow stance width and 140% of shoulder width is considered a wide stance width. A few studies have also normalized stance width to the width of the hips (distance between trochanters). However, there are also a possibility to normalize stance width in relation to the length of the lower extremities, since this variable might not change as much in dynamic situations and may correlate higher to the angle of the lower extremity in a frontal plane. AIM: This study aims to compare measurements of stance width when normalized to shoulder width, hip width and leg length for three different stance widths with feet attached to a board. METHOD: Motion capture (Qualisys, 16 Oqus-cameras) was used to measure 7 active male kitesurfers with their feet attached to a kiteboard (136 cm). They were 20-28 years old, in average 180 cm (SD=7 cm) and 78 kg (SD=7 kg). The subjects were standing with three different stance widths, using the same external rotation (20° bilaterally). Markers were attached to shoulders (acromion processes), knee joint lines, hips (trochanter major), heels (mid-posterior of calcaneus) and ankles (lateral and medial malleoli). Stance width was measured as the distance between the two medial ankle markers and normalized towards the distances between (1) the shoulder markers, (2) the hip markers and knee marker plus knee marker and lateral ankle marker and (3) the right and left hip marker. Furthermore, the angle of an extended lower extremity towards a vertical line in the frontal plane was measured. All measurements were done twice, and SPSS 20 was used for data analysis of correlation (Pearson’s r). RESULTS: The measured stance widths between ankles were 39.9 cm, 43.6 cm, and 48 cm (SD=1.2-1.4) for all subjects. The correlations (r) between the angle of the leg towards a vertical line and normalized stance width for the three normalization variables were: (1) 0.79, (2) 0.96 and (3) 0.93. All of the correlations were significant at a level of p>0.01. CONCLUSION: The results show that the variables hip or leg length would be preferred to use when normalizing stance width for young male athletes, standing in wide stance widths. Further studies using a greater number of subjects, more stance widths and a more heterogeneous group are suggested for the future.

  • 15.
    Parker, James
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS). Högskolan i Halmstad, Akademin för hälsa och välfärd, Centrum för forskning om välfärd, hälsa och idrott (CVHI).
    Lundgren, Lina
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS). Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Surfing the Waves of the CMJ: Are There between-Sport Differences in the Waveform Data?2018Ingår i: Sports, E-ISSN 2075-4663, Vol. 6, nr 4, s. 1-12, artikel-id 168Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The ability to analyse countermovement jump (CMJ) waveform data using statistical methods, like principal component analysis, can provide additional information regarding the different phases of the CMJ, compared to jump height or peak power alone. The aim of this study was to investigate the between-sport force-time curve differences in the CMJ. Eighteen high level golfers (male = 10, female = 8) and eighteen high level surfers (male = 10, female = 8) performed three separate countermovement jumps on a force platform. Time series of data from the force platform was normalized to body weight and each repetition was then normalized to 0–100 percent. Principal component analyses (PCA) were performed on force waveforms and the first six PCs explained 35% of the variance in force parameters. The main features of the movement cycles were characterized by magnitude (PC1 and PC5), waveform (PC2 and PC4), and phase shift features (PC3). Surf athletes differ in their CMJ technique and show a greater negative centre of mass displacement when compared to golfers (PC1), although these differences are not necessarily associated with greater jump height. Principal component 5 demonstrated the largest correlation with jump height (R2  = 0.52). Further studies are recommended in this area, to reveal which features of the CMJ thatrelate to jumping performance, and sport specific adaptations. © 2018 by the authors.

  • 16.
    Parker, James
    et al.
    Högskolan i Halmstad, Akademin för hälsa och välfärd, Centrum för forskning om välfärd, hälsa och idrott (CVHI).
    Lundgren, Lina E.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Pedal to the Metal: Velocity and Power in High Level Golfers2019Ingår i: Journal of Strength and Conditioning Research, ISSN 1064-8011, E-ISSN 1533-4287Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In most rotational power assessments, discrete variables are used for subsequent examination; however, movements are continuous, and data can be collected in time series. The purpose of this investigation was to examine the velocity- and power-time series characteristics of a standing rotation test and identify relationships with golf performance. Thirty-one golfers performed a golfspecific rotation test (GSRT) with 3 different resistances (6, 10, and 14 kg) in a robotic engine system. Time series of velocity and power was calculated from the raw data, and each repetition was then normalized to 0–100%. Principal component analyses (PCAs) were performed on velocity and power waveforms. The PCA used an eigenvalue analysis of the data covariance matrix. The relationship between clubhead speed (CHS) and all principal components (PC) was examined using linear regression. Ten velocity parameters and 6 power parameters explained 80% of the variance in the data. For velocity, the first 2 PCs identified both magnitude and phase shift features while PCs 3–5 identified difference features. For power, the first 2 PCs identified both magnitude and phase shift features, the third PC identified a phase shift feature, and the fourth PC identified a difference feature. The highest relationship with CHS was shown for GSRT with 14 kg in PC2 for power (R2 5 0.48, p , 0.001). The PCA of the GSRT power test could distinguish intraindividual differences, external loads, and sex-based differences. Athletes should focus on accelerating smoothly through the movement, particularly with heavier loads, and not pulling aggressively at the beginning of the rotational AU3 movement to achieve maximum power. Copyright © 2019 by the National Strength & Conditioning Association.

  • 17.
    Secomb, Josh L
    et al.
    Queensland Academy of Sport, Nathan, Australia & Edith Cowan University, Joondalup, Australia.
    Farley, Oliver R.
    Auckland University of Technology, Auckland, New Zealand.
    Nimphius, Sophia
    Centre for Exercise and Sport Science Research, Edith Cowan University, Joondalup, Australia.
    Lundgren, Lina E.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Tran, Tai T.
    Canadian Sports Institute-Pacific, Victoria, Canada.
    Sheppard, Jeremy M.
    Edith Cowan University, Joondalup, Australia & Canadian Sports Institute-Pacific, Victoria, Canada.
    The training-specific adaptations resulting from resistance training, gymnastics and plyometric training, and non-training in adolescent athletes2017Ingår i: International journal of sports science & coaching, ISSN 1747-9541, E-ISSN 2048-397X, Vol. 12, nr 6, s. 762-773Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Although previous research has investigated the training-specific adaptations to training in adults, there is a paucity of research aimed at investigating these adaptations in adolescent athletes. As such, adolescent athletes’ training-specific adaptations from three different training interventions were investigated in this study. Sixteen adolescent athletes participated in this study, whereby eight performed both training interventions and eight the non-training control. Pre- and post-testing was performed for each intervention with the testing battery: ultrasonography of the vastus lateralis and lateral gastrocnemius, countermovement jump, squat jump, and isometric mid-thigh pull. The resistance training group had large significant increases in isometric mid-thigh pull relative peak force (p < 0.01, g = 0.85 (−0.01, 1.71)) and vastus lateralis fascicle length (p = 0.04, g = 0.94 (0.07, 1.80)). The gymnastics and plyometric group demonstrated large significant changes in vastus lateralis pennation angle (p = 0.03, g = −0.94 (−1.81, −0.08)) and fascicle length (p = 0.03, g = 1.07 (0.19, 1.95)), and moderate significant increases in lateral gastrocnemius thickness (p = 0.01, g = 0.63 (−0.21, 1.47)) and eccentric leg stiffness (p = 0.03, g = 0.60 (−0.24, 1.44)). No significant changes were observed for any variables in the non-training group. The resistance training evoked increases in lower-body force producing capabilities, whereas the gymnastics and plyometric training evoked changes in muscle structure and inherent muscle qualities. © 2017, © The Author(s) 2017.

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