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Journal of Sports Sciences

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https://www.readbyqxmd.com/read/29143570/the-perceptual-responses-to-high-velocity-low-load-and-low-velocity-high-load-resistance-exercise-in-older-adults
#1
Darren L Richardson, Michael J Duncan, Alfonso Jimenez, Victoria M Jones, Paul M Juris, Neil D Clarke
The present study examined exercise affect during volume-load matched, high-velocity, low-load and low-velocity, high-load resistance exercise conditions in older adults. Ten older adults completed three sets of eight exercises on six separate occasions (three high-velocity, low-load and three low-velocity, high-load sessions) in a crossover study design. High-velocity, low-load was performed at 40% of predicted one repetition maximum, and low-velocity, high-load at 80%. The Physical Activity Affect Scale, Felt Arousal Scale, Feeling Scale, Rating of Perceived Exertion, Visual Analogue Scales, and the Physical Activity Enjoyment Scale examined exercise intensity and affect...
November 16, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29132263/movement-pattern-and-physiological-response-in-recreational-small-sided-football-effect-of-number-of-players-with-a-fixed-pitch-size
#2
Morten B Randers, Christina Ørntoft, Marie Hagman, Jens J Nielsen, Peter Krustrup
Recreational soccer is an effective health-promoting activity, but it is unclear how different game formats influence internal and external load. Thus, to be able to advise how to maximise the outcome of recreational football, we examined movement pattern and physiological response in 11 untrained men (32.6 ± 6.7 yrs, 23.3 ± 4.9 fat%, 43.4 ± 5.3 ml·min(-1)·kg(-1)) during three football sessions comprising 4 × 12 min of 3v3, 5v5 or 7v7 with a constant pitch size of 20 × 40 m. Movement pattern, heart rate (HR), blood lactate and RPE were measured during and after the 12-min periods...
November 13, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29130812/mutual-point-winning-probabilities-mpw-a-new-performance-measure-for-table-tennis
#3
Christophe Ley, Yves Dominicy, Wim Bruneel
We propose a new performance measure for table tennis players: the mutual point-winning probabilities (MPW) as server and receiver. The MPWs quantify a player's chances to win a point against a given opponent, and hence nicely complement the classical match statistics history between two players. These new quantities are based on a Bradley-Terry-type statistical model taking into account the importance of individual points, since a rally at 8-2 in the first set is less crucial than a rally at the score of 9-9 in the final set...
November 13, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29125037/an-audit-of-injuries-in-six-english-professional-soccer-academies
#4
Paul J Read, Jon L Oliver, Mark B A De Ste Croix, Gregory D Myer, Rhodri S Lloyd
Regulations now state that professional academies in the United Kingdom are required to substantially increase the volume of soccer training. This study assessed the current injury occurrence, providing an update to reports published prior to the introduction of the Elite Player Performance Plan (EPPP). 608 soccer players aged 11-18 years from six professional soccer clubs were prospectively monitored, recording injuries during the 2014-2015 season. An injury rate of 1.32 injuries per player/season was indicated with a mean time loss of 21...
November 10, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29125029/match-derived-relative-pitch-area-changes-the-physical-and-team-tactical-performance-of-elite-soccer-players-in-small-sided-soccer-games
#5
Sigrid B H Olthof, Wouter G P Frencken, Koen A P M Lemmink
Small-sided games (SSGs) are used in training sessions to prepare for full-sized matches. For the same number of players, smaller pitch sizes result in decreased physical performance and shorter interpersonal distances. A relative pitch area derived from the full-sized match results in larger pitch sizes and this may increase the fit between SSGs and full-sized matches. This study aimed to investigate SSGs with a traditional small pitch and a match-derived relative pitch area in youth elite soccer players. Four age categories (under-13, under-15, under-17 and under-19) played 4 vs...
November 10, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29125022/number-of-days-required-for-reliably-estimating-physical-activity-and-sedentary-behaviour-from-accelerometer-data-in-older-adults
#6
Jeffer Eidi Sasaki, Jairo Hélio Júnior, Joilson Meneguci, Sheilla Tribess, Moacir Marocolo Júnior, Antonio Stabelini Neto, Jair Sindra Virtuoso Júnior
The purpose of the study was to examine the minimum number of monitoring days for reliably estimating physical activity (PA) and sedentary behaviour (SB) from accelerometer data in older adults. Forty-two older adults from a local senior centre participated in this study. Participants wore an ActiGraph wGT3X-BT on the right hip for 7 consecutive days. Accelerometer data were downloaded to a computer and converted to activity count data in 60s epochs. Time spent in SB and different PA intensity categories were estimated with commonly used activity count cut-points...
November 10, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29125017/the-effects-of-resistance-training-volume-on-osteosarcopenic-obesity-in-older-women
#7
Paolo M Cunha, Alex S Ribeiro, Crisieli M Tomeleri, Brad J Schoenfeld, Analiza M Silva, Mariana F Souza, Matheus A Nascimento, Luís B Sardinha, Edilson S Cyrino
The aim of this study was to analyze the effects of resistance training (RT) performed with 1 or 3 sets per exercise on osteosarcopenic obesity (OSO) syndrome parameters in older women. Sixty-two older women (68.0 ± 4.3 years, 26.8 ± 4.4 kg/m(2)) participated in a 12-week RT program. Participants were randomly assigned into one of the three groups: two training groups that performed either 1 set (G1S, n = 21) or 3 sets (G3S, n = 20) 3 times weekly, or a control group (CG, n = 21). Body composition was assessed by dual X-ray absorptiometry, strength was evaluated by 1 repetition maximum testing...
November 10, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29115912/hyperoxia-for-performance-and-training
#8
D A Cardinale, B Ekblom
Recent technological developments have made it possible to use hyperoxia as an enhancement aid during training. Athletes wearing a mask can breathe a higher fraction of oxygen from a stationary or portable apparatus while exercising. A large body of evidence indicates that the oxygen transport capacity, lactate metabolism, power output and work tolerance (endurance) are improved when breathing hyperoxia. The physiological mechanisms underlying these performance improvements, although still not fully elucidated, are based on higher oxygen delivery and reduced central fatigue...
November 8, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29106335/psychosocial-development-through-masters-sport-what-can-be-gained-from-youth-sport-models
#9
Rylee A Dionigi, Jessica Fraser-Thomas, Rachael C Stone, Amy M Gayman
Although sport participation is encouraged throughout the lifespan, little research has been conducted on the role of sport in development later in life. This qualitative study explored adults' experiences of development within the context of Masters sport. We interviewed 14 adults (nine men and five women) aged 46-61 years involved in Masters sport. Data was interpreted drawing upon frameworks from youth sport (i.e., Personal Assets Framework for Sport; Côté, J., Bruner, M., Strachan, L., Erickson, K., & Fraser-Thomas, J...
November 6, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29099673/individualisation-of-speed-thresholds-does-not-enhance-the-dose-response-determination-in-football-training
#10
Dawn Scott, Ric Lovell
This study examined the utility of a range of approaches used to develop player-dependent speed zones in time-motion analysis (TMA), in determining the dose-response (internal load) of daily football training. Daily external (10 Hz GPS) and internal load (heart rate metrics, ratings of perceived exertion [RPE], wellness ratings) measures were tracked for 22 International women's football players during a 21-day training camp. High-speed (HSR) and very high speed running (VHSR) were determined according to arbitrary speed thresholds, as well as using a range of different individualization approaches that included the velocities corresponding to the heart rate deflection point, maximal aerobic speed, YYIR1 performance, and maximal sprint speed (MSS)...
November 3, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29099672/rotational-and-linear-head-accelerations-from-taekwondo-kicks-and-punches
#11
Gabriel P Fife, David M O'sullivan, Sae Yong Lee
The purpose was to compare rotational and linear head accelerations as a result of taekwondo kicks and punches. Taekwondo athletes executed five repetitions of the turning kick, spinning hook kick, hook punch, straight punch, and jab punch to a Hybrid III Crash Test Dummy head-neck complex. A tri-axial accelerometer and an angular rate sensor were mounted inside the Hybrid III head to measure resultant linear (RLA) and rotational accelerations. The Hybrid III was fixed to a height-adjustable frame and fitted with protective taekwondo headgear...
November 3, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29099665/analysis-of-muscular-activity-and-dynamic-response-of-the-lower-limb-adding-vibration-to-cycling
#12
Marcela Munera, William Bertucci, Sebastien Duc, Xavier Chiementin
Vibration in cycling has been proved to have undesirable effects over health, comfort and performance of the rider. In this study, 15 participants performed eight 6-min sub-maximal pedalling exercises at a constant power output (150W) and pedalling cadence (80 RPM) being exposed to vibration at different frequencies (20, 30, 40, 50, 60, 70 Hz) or without vibration. Oxygen uptake (VO2), heart rate (HR), surface EMG activity of seven lower limb muscles (GMax, RF, BF, VM, GAS, SOL and TA) and 3-dimentional accelerations at ankle, knee and hip were measured during the exercises...
November 3, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29099654/control-of-impact-loading-during-distracted-running-before-and-after-gait-retraining-in-runners
#13
Roy T H Cheung, Winko W An, Ivan P H Au, Janet H Zhang, Zoe Y S Chan, Aislinn J MacPhail
Gait retraining using visual biofeedback has been reported to reduce impact loading in runners. However, most of the previous studies did not adequately examine the level of motor learning after training, as the modified gait pattern was not tested in a dual-task condition. Hence, this study sought to compare the landing peak positive acceleration (PPA) and vertical loading rates during distracted running before and after gait retraining. Sixteen recreational runners underwent a two-week visual biofeedback gait retraining program for impact loading reduction, with feedback on the PPA measured at heel...
November 3, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29099652/impact-of-short-compared-to-long-haul-international-travel-on-the-sleep-and-wellbeing-of-national-wheelchair-basketball-athletes
#14
Heidi R Thornton, Joanna Miller, Lee Taylor, Charli Sargent, Michele Lastella, Peter M Fowler
Currently, very little is known about the impact of short- or long-haul air travel on the sleep and wellbeing of wheelchair basketball athletes. Eleven national wheelchair basketball athletes wore actigraphy monitors prior, during, and after air travel to the United Kingdom. Upon arrival, participants rated their subjective jet-lag, fatigue, and vigor. Individuals traveled to the United Kingdom from different locations in Australia, the United States, and Europe and were categorised according to travel length [LONG (up to 30...
November 3, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29099649/validity-of-proximity-sensor-based-wear-time-detection-using-the-actigraph-gt9x
#15
Diego Arguello, Kristie Andersen, Alvin Morton, Patty S Freedson, Stephen S Intille, Dinesh John
Our study investigated the performance of proximity sensor-based wear-time detection using the GT9X under laboratory and free-living settings. Fifty-two volunteers (23.2 ± 3.8 y; 23.2 ± 3.7 kg/m(2)) participated in either a laboratory or free-living protocol. Lab participants wore and removed a wrist-worn GT9X on 3-5 occasions during a 3-hour directly observed activity protocol. The 2-day free-living protocol used an independent temperature sensor and self-report as the reference to determine if wrist and hip-worn GT9X accurately determined wear (i...
November 3, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29094653/seasonal-changes-in-physical-activity-during-school-recess-and-lunchtime-among-australian-children
#16
Nicola D Ridgers, Jo Salmon, Anna Timperio
This study examined how children's physical activity levels during recess and lunchtime and the contribution of recess and lunchtime to daily physical activity differed across seasons. Three hundred and twenty-six children aged 8-11 years from Australia participated. Physical activity was measured every 15-seconds using hip-mounted ActiGraph accelerometers for 7 consecutive days during the winter (n = 246), spring (n = 211), summer (n = 161) and autumn terms (n = 139). Data were collected 2012-2013...
November 2, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29091016/a-critical-review-of-the-current-evidence-examining-whether-resistance-training-improves-time-trial-performance
#17
Scott J Dankel, Kevin T Mattocks, J Grant Mouser, Samuel L Buckner, Matthew B Jessee, Jeremy P Loenneke
A number of reviews have concluded that resistance training is beneficial for improving sports performance despite the inclusion of studies which do not actually measure a performance outcome (i.e. a timed trial). The purpose of this review was to examine only those studies which would allow us to infer the benefits of resistance training on improving time trial performance. Of the nine studies meeting all inclusion criteria only three demonstrated an additive effect of adding resistance training to the current activity-specific training being performed...
November 1, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29090987/the-validity-and-inter-device-variability-of-the-apple-watch%C3%A2-for-measuring-maximal-heart-rate
#18
Grant Abt, James Bray, Amanda Clare Benson
Maximal heart rate (HRmax) is a fundamental measure used in exercise prescription. The Apple Watch™ measures heart rate yet the validity and inter-device variability of the device for measuring HRmax are unknown. Fifteen participants completed a maximal oxygen uptake test while wearing an Apple Watch™ on each wrist. Criterion HRmax was measured using a Polar T31™ chest strap. There were good to very good correlations between the watches and criterion (left: r = 0.87 [90%CI: 0.67 to 0.95]; right: r = 0...
November 1, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29087784/does-self-perceived-sleep-reflect-sleep-estimated-via-activity-monitors-in-professional-rugby-league-athletes
#19
Johnpaul Caia, Heidi R Thornton, Vincent G Kelly, Tannath J Scott, Shona L Halson, Balin Cupples, Matthew W Driller
This study examined agreement between self-perceived sleep and sleep estimated via activity monitors in professional rugby league athletes. 63 athletes, from three separate teams wore actigraphy monitors for 10.3 ± 3.9 days. During the monitoring period, ratings of perceived sleep quality (on a 1-5 and 1-10 Likert scale), and an estimate of sleep duration were recorded daily. Agreement between sleep estimated via activity monitors and self-perceived sleep was examined using mean bias, Pearson correlation (r) and typical error of the estimate (TEE)...
October 31, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29086625/flexibility-training-in-preadolescent-female-athletes-acute-and-long-term-effects-of-intermittent-and-continuous-static-stretching
#20
Οlyvia Donti, Konstantina Papia, Argyris Toubekis, Anastasia Donti, William A Sands, Gregory C Bogdanis
This study compared the acute and long-term effects of intermittent and continuous static stretching training on straight leg raise range of motion (ROM). Seventy-seven preadolescent female gymnasts were divided into a stretching (n = 57), and a control group (n = 20). The stretching group performed static stretching of the hip extensors of both legs, three times per week for 15 weeks. One leg performed intermittent (3 × 30 s with 30 s rest) while the other leg performed continuous stretching (90 s)...
October 31, 2017: Journal of Sports Sciences
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