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Parker, J., Hellström, J. & Olsson, M. C. (2019). Differences in kinematics and driver performance in elite female and male golfers. Sports Biomechanics
Öppna denna publikation i ny flik eller fönster >>Differences in kinematics and driver performance in elite female and male golfers
2019 (Engelska)Ingår i: Sports Biomechanics, ISSN 1476-3141, E-ISSN 1752-6116Artikel i tidskrift (Refereegranskat) Epub ahead of print
Abstract [en]

The aim of this study was to compare swing kinematic differences between women and men and investigate which variables predict clubhead speed (CHS) and carry distance (CD) whilst accounting for individual variation. Methods: Swing kinematics and driver performance data were collected on 20 (10 women) elite golfers (HCP 0.7 ± 1.4). We used Bayesian T-test for between sex comparison of swing kinematics and Bayesian Analysis of covariance (ANCOVA) to produce general linear models for CHS and carry distance for elite female and male golfers separately. Results: There was strong evidence that the driver performance variables CHS and CD were decreased in women compared to men, and two kinematic variables; time to arm peak speed downswing and angular wrist peak speed were slower in women. The ANCOVAs identified very strong to overwhelming evidence that participant as a fixed factor was a determinant of CHS for both women and men but was not a determinant of CD. Conclusion: when looking to enhance driver performance among high-level golfers, coaches should be aware that variables that determine CHS and CD differ among women and men and if the aim is to improve CHS coaches should not forget the importance of individual swing characteristics. © 2019 Parker, Hellström & Olsson. Published by Informa UK Limited, trading as Taylor & Francis Group.

Ort, förlag, år, upplaga, sidor
Abingdon: Routledge, 2019
Nyckelord
Bayesian inference, clubhead speed, carry distance, golf performance, sex differences
Nationell ämneskategori
Idrottsvetenskap
Identifikatorer
urn:nbn:se:hh:diva-41081 (URN)10.1080/14763141.2019.1683221 (DOI)000496368700001 ()31724482 (PubMedID)2-s2.0-85075147208 (Scopus ID)
Forskningsfinansiär
KK-stiftelsen, 2012/0319
Tillgänglig från: 2019-12-03 Skapad: 2019-12-03 Senast uppdaterad: 2019-12-04
Parker, J., Ivarsson, A., Johnson, U., Svetoft, I., Andersen, M., Schough, C., . . . Warpman, S. (2019). Is self-determined motivation associated with the effects of an intervention aimed to increase physical activity and exercise levels? An 80-day follow-up. In: Abstract book for the ISBNPA 2019 Annual Meeting in Prague: . Paper presented at International Society of Behavior Nutrition and Physical Activity 2019 Annual Meeting, Prague, Czech Republic, 4-7 June, 2019 (pp. 488-488). International Society of Behavioral Nutrition and Physical Activity
Öppna denna publikation i ny flik eller fönster >>Is self-determined motivation associated with the effects of an intervention aimed to increase physical activity and exercise levels? An 80-day follow-up
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2019 (Engelska)Ingår i: Abstract book for the ISBNPA 2019 Annual Meeting in Prague, International Society of Behavioral Nutrition and Physical Activity , 2019, s. 488-488Konferensbidrag, Poster (med eller utan abstract) (Refereegranskat)
Abstract [en]

Objective: State-of-the-art technologies, for instance smart watches and smartphones, have the potential to positively influence physical activity and exercise in sedentary populations. Psychological factors, such as self-determined (SD) motivation, might influence the impact state-of-the-art technologies have on level of physical activity and exercise. The aim of this study was to investigate if self-determined motivation influences an intervention on both physical activity (PA) and exercise in a sedentary population.

Methods: 16 participants (men = 5, women = 11) with a self-reported low level of PA over the last year and predominantly sedentary jobs volunteered to participate in the study. PA data (steps and exercise time) were collected over an 80-day period using a wrist-worn accelerometer (Apple-watch and iPhone). Motivation was measured with the Behavioral Regulation in Exercise Questionnaire-2. At the start of the study, each participant completed the questionnaire and received their Apple-watches. Data analysis: All PA and exercise data were recorded through the Apple-watch and via Health App. Data for PA (steps) and exercise time were then extracted and aggregated to daily totals. Statistical analysis: Group means and standard deviations were calculated. A linear regression analysis was used to analyze the relationship between exercise time, PA, and SD, the R2 value effect size (ES) was used to estimate the magnitude of the differences. All data analyses were performed in MatLab (software, R2016b).

Results/findings: SD motivation (3.9±0.9) had a medium (R2 = 0.09) but not statistically significant (p = .26) effect on the amount of moderate to high-intensity exercise time (33.3±39.6 minutes) during the 80-day period. There was no statistically significant effect (R2 = 0.003, p = .84) of SD on PA (12953±7717 steps).

Conclusions: Given the small sample size, achieving a medium effect size has meaningful significance despite not achieving statistical significance. This result suggests that self-determined motivation effects the amount of daily exercise but not PA in a sedentary population. Combining technology and other strategies (e.g., motivational interviewing, coaching) to promote behavior change is promising, and these interventions should include theoretically derived behavior change techniques and take level of SD motivation into account.

Ort, förlag, år, upplaga, sidor
International Society of Behavioral Nutrition and Physical Activity, 2019
Nyckelord
Self-determined motivation, Physical activity
Nationell ämneskategori
Folkhälsovetenskap, global hälsa, socialmedicin och epidemiologi
Identifikatorer
urn:nbn:se:hh:diva-39689 (URN)978-1-7324011-1-2 (ISBN)
Konferens
International Society of Behavior Nutrition and Physical Activity 2019 Annual Meeting, Prague, Czech Republic, 4-7 June, 2019
Forskningsfinansiär
KK-stiftelsen
Tillgänglig från: 2019-06-11 Skapad: 2019-06-11 Senast uppdaterad: 2019-08-02Bibliografiskt granskad
Parker, J., Ivarsson, A., Johnson, U., Svetoft, I., Andersen, M., Schough, C., . . . Warpman, S. (2019). Is self-determined motivation associated with the effects of an intervention aimed to increase physical activity and exercise levels? An 80-day follow-up. Paper presented at Conference: International Society of Behavior Nutrition and Physical Activity 2019 Annual Meeting, Prague, Czech Republic, June 4-7, 2019. International Journal of Behavioral Nutrition and Physical Activity
Öppna denna publikation i ny flik eller fönster >>Is self-determined motivation associated with the effects of an intervention aimed to increase physical activity and exercise levels? An 80-day follow-up
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2019 (Engelska)Ingår i: International Journal of Behavioral Nutrition and Physical Activity, ISSN 1479-5868, E-ISSN 1479-5868Artikel i tidskrift, Meeting abstract (Refereegranskat) Published
Abstract [en]

Objective: State-of-the-art technologies, for instance smart watches and smartphones, have the potential to positively influence physical activity and exercise in sedentary populations. Psychological factors, such as self-determined (SD) motivation, might influence the impact state-of-the-art technologies have on level of physical activity and exercise. The aim of this study was to investigate if self-determined motivation influences an intervention on both physical activity (PA) and exercise in a sedentary population.

Methods: 16 participants (men = 5, women = 11) with a self-reported low level of PA over the last year and predominantly sedentary jobs volunteered to participate in the study. PA data (steps and exercise time) were collected over an 80-day period using a wrist-worn accelerometer (Apple-watch and iPhone). Motivation was measured with the Behavioral Regulation in Exercise Questionnaire-2. At the start of the study, each participant completed the questionnaire and received their Apple-watches. Data analysis: All PA and exercise data were recorded through the Apple-watch and via Health App. Data for PA (steps) and exercise time were then extracted and aggregated to daily totals. Statistical analysis: Group means and standard deviations were calculated. A linear regression analysis was used to analyze the relationship between exercise time, PA, and SD, the R2 value effect size (ES) was used to estimate the magnitude of the differences. All data analyses were performed in MatLab (software, R2016b).

Results/findings: SD motivation (3.9±0.9) had a medium (R2 = 0.09) but not statistically significant (p = .26) effect on the amount of moderate to high-intensity exercise time (33.3±39.6 minutes) during the 80-day period. There was no statistically significant effect (R2 = 0.003, p = .84) of SD on PA (12953±7717 steps).

Conclusions: Given the small sample size, achieving a medium effect size has meaningful significance despite not achieving statistical significance. This result suggests that self-determined motivation effects the amount of daily exercise but not PA in a sedentary population. Combining technology and other strategies (e.g., motivational interviewing, coaching) to promote behavior change is promising, and these interventions should include theoretically derived behaviour change techniques and take level of SD motivation into account.

Ort, förlag, år, upplaga, sidor
London, UK: BioMed Central, 2019
Nationell ämneskategori
Folkhälsovetenskap, global hälsa, socialmedicin och epidemiologi
Identifikatorer
urn:nbn:se:hh:diva-41082 (URN)
Konferens
Conference: International Society of Behavior Nutrition and Physical Activity 2019 Annual Meeting, Prague, Czech Republic, June 4-7, 2019
Tillgänglig från: 2019-12-03 Skapad: 2019-12-03 Senast uppdaterad: 2019-12-04
Parker, J. & Lundgren, L. (2019). Pedal to the Metal: Velocity and Power in High Level Golfers. Journal of Strength and Conditioning Research
Öppna denna publikation i ny flik eller fönster >>Pedal to the Metal: Velocity and Power in High Level Golfers
2019 (Engelska)Ingår i: Journal of Strength and Conditioning Research, ISSN 1064-8011, E-ISSN 1533-4287Artikel i tidskrift (Refereegranskat) In press
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.

Ort, förlag, år, upplaga, sidor
Philadelphia, PA: Lippincott Williams & Wilkins, 2019
Nyckelord
principal component analysis, time series, golf, athlete assessment
Nationell ämneskategori
Idrottsvetenskap
Identifikatorer
urn:nbn:se:hh:diva-41088 (URN)10.1519/JSC.0000000000003357 (DOI)31490426 (PubMedID)
Forskningsfinansiär
KK-stiftelsen, 2012/0319
Tillgänglig från: 2019-12-03 Skapad: 2019-12-03 Senast uppdaterad: 2019-12-03
Parker, J. (2018). A multi-disciplinary approach to studying performance among high-level golfers: physiological and biomechanical aspects. (Licentiate dissertation). Halmstad: Halmstad University Press
Öppna denna publikation i ny flik eller fönster >>A multi-disciplinary approach to studying performance among high-level golfers: physiological and biomechanical aspects
2018 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In competitive golf, the player’s ability to hit the ball a long distance affects the score in a positive way. Swing kinematics is considered an important factor in driver performance; one way of improving swing kinematics is through strength and power training. Subsequently, high-level golfers and their coaches often explore novel ways of increasing the distance of a shot, in particular driver carry distance (CD). This licentiate thesis presents two studies with the overall aim of studying how swing kinematic and physical characteristics are associated with driver performance among intercollegiate golf players. The studies report swing kinematics associated with driver performance (study 1) and the impact of isokinetic rotational training on driver performance and swing kinematic variables (study 2).

The methods used were (1) a cross-sectional correlation study (n=15) and (2) an open trial intervention study (n=20). The studies investigated (1) the relationship between golf swing kinematics and driver performance, and (2) the impact of strength training on swing kinematics and driver performance variable.

The results show variables that were distinctive for the club head speed (CHS) were mainly during the downswing: greater X-factor stretch; and higher pelvis peak speed. Whilst, factors distinctive to the regression model for CD were mainly at impact: reduced thorax rotation; and greater thorax lateral bend. Nine weeks of isokinetic training increased seated rotational force and power, peak arm speed and arm acceleration, ball speed, and CD more compared to isotonic training. Even though isokinetic training did not increase CHS, it did result in greater CD.

This licentiate thesis contributes to the understanding of which variables influence driver performance, in particular CD, among high-level golfers. Segmental interactions (pelvis-thorax), lead arm speed and acceleration, isokinetic and isotonic training. These results may guide training interventions aiming to improve driver and golf performance among high-level golfers, particularly those with a background of strength training. Future studies could investigate how the interaction between swing kinematics, clubhead trajectory, and driver performance variables differ between male and female golfers.

Ort, förlag, år, upplaga, sidor
Halmstad: Halmstad University Press, 2018. s. 73
Serie
Halmstad University Dissertations ; 49
Nyckelord
Carry distance, clubhead speed, driver performance, golf kinematics, sports performance, strength training, isokinetic training
Nationell ämneskategori
Idrottsvetenskap
Identifikatorer
urn:nbn:se:hh:diva-37792 (URN)978-91-88749-02-4 (ISBN)978-91-88749-03-1 (ISBN)
Presentation
2018-09-18, O125, Högskolan i Halmstad, Halmstad, 09:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
KK-stiftelsen, 2012/0319
Tillgänglig från: 2018-09-20 Skapad: 2018-08-27 Senast uppdaterad: 2018-09-20Bibliografiskt granskad
Hertting, K., Holmquist, M., Parker, J., Karlsson, M. & Sandéhn, A. (2018). Ping pong health!: A table tennis intervention for improved health at the workplace. In: Urban Johnson, Lars Kristén, Miran Kondrič (Ed.), The Science and Practice of Racket Sport for Improved Performance and Health: Special Focus on Table Tennis: Book of Abstracts. Paper presented at The Science and Practice of Racket Sports for Improved Performance and Health, Halmstad University, Halmstad, Sweden, April 25-27, 2018 (pp. 22-23). Halmstad: Halmstad University
Öppna denna publikation i ny flik eller fönster >>Ping pong health!: A table tennis intervention for improved health at the workplace
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2018 (Engelska)Ingår i: The Science and Practice of Racket Sport for Improved Performance and Health: Special Focus on Table Tennis: Book of Abstracts / [ed] Urban Johnson, Lars Kristén, Miran Kondrič, Halmstad: Halmstad University , 2018, s. 22-23Konferensbidrag, Muntlig presentation med publicerat abstract (Refereegranskat)
Abstract [en]

Introduction: Physical activity has a positive impact on physical and psychological well-being (Delisle, Werch, Wong, Bian, & Weiler, 2010), as well as social relations and skills development (Lamu & Olsen, 2016; Perkins & Williamon, 2014). Adopting a “healthy organization” culture through health programs, with strong senior and middle management support, and using interventions can promote health at workplaces (Rajaratnam et. al., 2014). We, therefore, consider it relevant to have physical activity, social relations and skill development as the starting point in a tabletennis intervention at the workplace.

Aim: The aim was to develop, implement, and evaluate an intervention for improving health and wellbeing in the workplace by introducing table tennis.

Methods and results: The intervention design consisted of two workshops and five table tennis sessions. Thirteen employees from a warehouse within the retail sector participated in the intervention. The participants had various backgrounds in table tennis and sport in general, different motives to participate, and came from different groups of employees (management and stock). After an introductory workshop, two table tennis coaches held one training session a week over the fiveweek intervention period. The employees were divided in to two groups and each group had a 45-minute session. The evaluation is in progress at present. Pre- and post-measurement has been conducted using health questionnaires Short Form 36 Health Survey (SF-36) and International Physical Activity Questionnaire (IPAQ). These will be analysed using a Bayesian paired t-test analysis. Based on the results of the questionnaire focus group interviews will be conducted with participants. Three focus groups of 4-5 participants in each group. The questions will focus on 24 experiences of the intervention and reflections on future directions for table-tennis and wellbeing activities at the workplace. Finally, there will be a workshop pointing out future directions for sport-based health activities at the workplace.

Ort, förlag, år, upplaga, sidor
Halmstad: Halmstad University, 2018
Nyckelord
Health, well-being, workplace intervention
Nationell ämneskategori
Annan hälsovetenskap
Identifikatorer
urn:nbn:se:hh:diva-38405 (URN)978-91-639-7129-7 (ISBN)
Konferens
The Science and Practice of Racket Sports for Improved Performance and Health, Halmstad University, Halmstad, Sweden, April 25-27, 2018
Tillgänglig från: 2018-11-22 Skapad: 2018-11-22 Senast uppdaterad: 2018-12-13Bibliografiskt granskad
Parker, J. & Lundgren, L. (2018). Surfing the Waves of the CMJ: Are There between-Sport Differences in the Waveform Data?. Sports, 6(4), 1-12, Article ID 168.
Öppna denna publikation i ny flik eller fönster >>Surfing the Waves of the CMJ: Are There between-Sport Differences in the Waveform Data?
2018 (Engelska)Ingår i: Sports, E-ISSN 2075-4663, Vol. 6, nr 4, s. 1-12, artikel-id 168Artikel i tidskrift (Refereegranskat) Published
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.

Ort, förlag, år, upplaga, sidor
Basel: MDPI, 2018
Nyckelord
force-time, jump testing, kinetic assessment, principal component analysis, vertical jump
Nationell ämneskategori
Idrottsvetenskap
Identifikatorer
urn:nbn:se:hh:diva-38530 (URN)10.3390/sports6040168 (DOI)
Forskningsfinansiär
KK-stiftelsen, 2012/0319
Tillgänglig från: 2018-12-10 Skapad: 2018-12-10 Senast uppdaterad: 2018-12-10Bibliografiskt granskad
Parker, J. (2017). Construct validity and test-retest reliability of the force-velocity profile in a golf specific rotation movement. In: Ferrauti, A., Platen, P., Grimminger-Seidensticker, E., Jitner, T., Bartmus, U., Becher, L., De MArées, M., Muhlbauer, T., Schauterte, A., Wiewelhove, T., Tsolakidis, E. (Ed.), Book of Abstracts of the 22nd Annual Congress of the European College of Sport Science – 5th - 8th July 2017, MetropolisRuhr – Germany: . Paper presented at 22nd Annual Congress of the European College of Sport Science, Essen, Germany, 5th-8th July, 2017 (pp. 294-294). Cologne: European College of Sport Science
Öppna denna publikation i ny flik eller fönster >>Construct validity and test-retest reliability of the force-velocity profile in a golf specific rotation movement
2017 (Engelska)Ingår i: Book of Abstracts of the 22nd Annual Congress of the European College of Sport Science – 5th - 8th July 2017, MetropolisRuhr – Germany / [ed] Ferrauti, A., Platen, P., Grimminger-Seidensticker, E., Jitner, T., Bartmus, U., Becher, L., De MArées, M., Muhlbauer, T., Schauterte, A., Wiewelhove, T., Tsolakidis, E., Cologne: European College of Sport Science , 2017, s. 294-294Konferensbidrag, Muntlig presentation med publicerat abstract (Refereegranskat)
Abstract [en]

Introduction: Assessing the isoinertial force-velocity (F-V) and power relationships has previously been found valuable to assist the understanding of the underlying mechanisms responsible for maximal power output. Multiple studies have investigated the F-V profile in the lower body, however, few studies have investigated F-V profiling in rotational movements, in particular, the golf swing. There is a need for isoinertial strength assessment protocols which can relate to final swing performance. The specific objective of the study was to investigate if measurements of force, velocity, and power using five different loads in a golf specific rotational movement are valid and reliable. Methods: 12 elite golfers (handicap -1.5±1.2) 8 men and 4 women performed a golf relevant rotational movement using five different loads (2, 6, 10, 14, and18 kg) in a motorised cable machine (1080 Motion AB, Sweden), measuring exercise peak force (PF), peak velocity (PV), and peak power (PP). In addition, normal-swing driver clubhead speed (CHSnor), and maximum clubhead speed (CHSmax) was measured using radar (Trackman, Denmark). The best of three trials for CHSnor, CHSmax, and the golf rotation was used for further analysis. Test-retest occasions were separated by 7-14 days. Statistical analysis: Change in mean (CIM) individual inter-session coefficient of variation (CV) and intraclass correlation coefficient (ICC) was used to analyze test-retest reliability, a Spearman's correlation between the rotation output variables and the CHS was used to assess construct validity.For reliability, an ICC of >0.70 was considered acceptable and results for correlation was considered excellent (≥0.90), good (0.75–0.89), moderate (0.50–0.74), poor (<0.50).was considered to be acceptable. Results: PF, PV, and PP for all of the five loads, apart from PP with 2 kg (CIM=12.2%, CV=14.1%, &ICC= 0.29) and PP with 18kg (CIM=8.6%, CV=19.1%, & ICC= 0.93), showed good reliability (CIM= 0.05-3.6%, CV=1.4-8.5%, & ICC= 0.84-0.97). PF (r=0.780-0.89 & 0.75-0.88), PV (r=0.76-0.86 & 0.78-0.85), and PP (r=0.75-0.84 & 0.76-0.85) for all loads had statistically significant strong correlations with both CHSnor and CHSmax respectively, apart from PF at 2kg (r=0.33). The average day to day variation among all loads for PF, PV and PP were 17.9 ±13.7 N, 0.30 ± 0.23 m/s, and 135.9 ± 128.1 W respectively. Greatest PP was achieved with the 14 kg load, although PP at 6, 10, and 14kg only differed by 90 W (8%) between these loads. Discussion: Isoinertial force-velocity-power profiling in high-level golfers can be assessed after a familiarization session. The strongest correlation among the rotational tests and CHS was between PF at 10 kg and CHSnor (r=0.89) and in general, the PF, PV, and PP variables had a strong relationship with both CHSnor and CHSmax. Such profiling may provide valuable information insight into the neuromuscular capabilities of high-level golfers and may be used to monitor specific training adaptions.

Ort, förlag, år, upplaga, sidor
Cologne: European College of Sport Science, 2017
Nyckelord
Golf performance, force velocity power
Nationell ämneskategori
Idrottsvetenskap
Identifikatorer
urn:nbn:se:hh:diva-35129 (URN)978-3-9818414-0-4 (ISBN)
Konferens
22nd Annual Congress of the European College of Sport Science, Essen, Germany, 5th-8th July, 2017
Forskningsfinansiär
KK-stiftelsen
Tillgänglig från: 2017-10-03 Skapad: 2017-10-03 Senast uppdaterad: 2017-10-06Bibliografiskt granskad
Parker, J., Lagerhem, C., Hellström, J. & Olsson, C. M. (2017). Effects of nine weeks isokinetic training on power, golf kinematics, and driver performance in pre-elite golfers. BMC Sports Science, Medicine and Rehabilitation, 9, Article ID 21.
Öppna denna publikation i ny flik eller fönster >>Effects of nine weeks isokinetic training on power, golf kinematics, and driver performance in pre-elite golfers
2017 (Engelska)Ingår i: BMC Sports Science, Medicine and Rehabilitation, ISSN 2052-1847, Vol. 9, artikel-id 21Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Background

It has previously been shown that isotonic strength training can improve driver performance among golfers, though few studies have investigated effects of strength training on swing kinematics together with driver performance. In this study we investigated whether isokinetic rotational training could improve driver performance and swing kinematic variables amongst elite golfers.

Methods

Twenty competitive pre-elite golfers (handicap better than −3.0), 13 men and 7 women, were split into two groups, one group received the isokinetic power training (IK) alongside their normal isotonic pre-season strength-training and the other group continued with their normal isotonic pre-season strength-training regime (IT). The IK group completed 12 sessions of isokinetic power training on a standing rotation exercise (10% body weight at 1 m/s) and barbell squat (25 kg plus 10% body weight at 0.5 m/s). The IT group continued with their normal isotonic pre-season strength-training regime. Participants were tested for rotational power, lower body power, golf swing kinematics, and driver performance before and after a nine-week training period.

Results

After the nine-week training period both the IK and the IT groups increased their dominant side rotational force and power (effect sizes between 0.50–0.96) and magnitude based inference indicated that IK had a likely (> 80%) more beneficial increase in dominant side rotational force and power. For swing kinematics, IK had a likely (> 80%) more beneficial improvement in lead arm speed and acceleration compared to the IT group. For driver performance, IK had a possible (65%) beneficial effect on ball speed and likely (78%) beneficial effect on carry distance when compared to IT, whereas neither of the groups improved club head speed.

Conclusion

In the present study on pre-elite golfers we found that 9 weeks of isokinetic training increased seated rotational force and power, peak arm speed and arm acceleration, ball speed, and carry distance more compared to isotonic training. Even though isokinetic training did not increase CHS, it did result in greater carry distance. © The Author(s). 2017

Ort, förlag, år, upplaga, sidor
London: BioMed Central, 2017
Nyckelord
Golf biomechanics, Isokinetic training, PowerDriver performance, Kinematics, Performance gains
Nationell ämneskategori
Annan naturvetenskap Idrottsvetenskap
Identifikatorer
urn:nbn:se:hh:diva-35843 (URN)10.1186/s13102-017-0086-9 (DOI)000417565100002 ()29238597 (PubMedID)2-s2.0-85037710214 (Scopus ID)
Projekt
KK-HÖG projekt successful injury-free golf
Forskningsfinansiär
KK-stiftelsen, 2012/0319
Tillgänglig från: 2017-12-13 Skapad: 2017-12-13 Senast uppdaterad: 2018-10-29Bibliografiskt granskad
Verikas, A., Parker, J., Bacauskiene, M. & Olsson, M. C. (2017). Exploring relations between EMG and biomechanical data recorded during a golf swing. Expert systems with applications, 88, 109-117
Öppna denna publikation i ny flik eller fönster >>Exploring relations between EMG and biomechanical data recorded during a golf swing
2017 (Engelska)Ingår i: Expert systems with applications, ISSN 0957-4174, E-ISSN 1873-6793, Vol. 88, s. 109-117Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Exploring relations between patterns of peak rotational speed of thorax, pelvis and arm, and patterns of EMG signals recorded from eight muscle regions of forearms and shoulders during the golf swing is the main objective of this article. The linear canonical correlation analysis, allowing studying relations between sets of variables, was the main technique applied. To get deeper insights, linear and nonlinear random forests-based prediction models relating a single output variable, e.g. a thorax peak rotational speed, with a set of input variables, e.g. an average intensity of EMG signals were used. The experimental investigations using data from 16 golfers revealed statistically significant relations between sets of input and output variables. A strong direct linear relation was observed between lin- ear combinations of EMG averages and peak rotational speeds. The coefficient of determination values R2 = 0 . 958 and R2 = 0 . 943 obtained on unseen data by the random forest models designed to predict peak rotational speed of thorax and pelvis , indicate high modelling accuracy. However, predictions of peak rotational speed of arm were less accurate. This was expected, since peak rotational speed of arm played a minor role in the linear combination of peak speeds. The most important muscles to predict peak rotational speed of the body parts were identified. The investigations have shown that the canon- ical correlation analysis is a promising tool for studying relations between sets of biomechanical and EMG data. Better understanding of these relations will lead to guidelines concerning muscle engagement and coordination of thorax, pelvis and arms during a golf swing and will help golf coaches in providing substantiated advices. ©2017 Elsevier Ltd. All rights reserved.

Ort, förlag, år, upplaga, sidor
Kidlington, Oxford: Pergamon Press, 2017
Nyckelord
Canonical correlation, Random forest, Prediction, EMG, Golf
Nationell ämneskategori
Idrottsvetenskap
Identifikatorer
urn:nbn:se:hh:diva-34611 (URN)10.1016/j.eswa.2017.06.041 (DOI)000408789300008 ()2-s2.0-85021670724 (Scopus ID)
Forskningsfinansiär
KK-stiftelsen, 2012/0319
Tillgänglig från: 2017-07-12 Skapad: 2017-07-12 Senast uppdaterad: 2018-03-23Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0003-1184-5036

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