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Journal of Sports Science & Medicine

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https://www.readbyqxmd.com/read/27803635/discriminating-talent-identified-junior-australian-footballers-using-a-fundamental-gross-athletic-movement-assessment
#1
Carl T Woods, Harry G Banyard, Ian McKeown, Job Fransen, Sam Robertson
Talent identification (TID) is a pertinent component of the sports sciences, affording practitioners the opportunity to target developmental interventions to a select few; optimising financial investments. However, TID is multi-componential, requiring the recognition of immediate and prospective performance. The measurement of athletic movement skill may afford practitioners insight into the latter component given its augmented relationship with functional sport specific qualities. It is currently unknown whether athletic movement skill is a discriminant quality in junior Australian football (AF)...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803634/validation-of-biofeedback-wearables-for-photoplethysmographic-heart-rate-tracking
#2
Edward Jo, Kiana Lewis, Dean Directo, Michael J Kim, Brett A Dolezal
The purpose of this study was to examine the validity of HR measurements by two commercial-use activity trackers in comparison to ECG. Twenty-four healthy participants underwent the same 77-minute protocol during a single visit. Each participant completed an initial rest period of 15 minutes followed by 5 minute periods of each of the following activities: 60W and 120W cycling, walking, jogging, running, resisted arm raises, resisted lunges, and isometric plank. In between each exercise task was a 5-minute rest period...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803633/eight-weeks-of-phosphatidic-acid-supplementation-in-conjunction-with-resistance-training-does-not-differentially-affect-body-composition-and-muscle-strength-in-resistance-trained-men
#3
Thomas L Andre, Joshua J Gann, Sarah K McKinley-Barnard, Joon J Song, Darryn S Willoughby
This study attempted to determine the effects of eight weeks of resistance training (RT) combined with phosphatidic acid (PA) supplementation at a dose of either 250 mg or 375 mg on body composition and muscle size and strength. Twenty-eight resistance-trained men were randomly assigned to ingest 375 mg [PA375 (n = 9)] or 250 mg [PA250 (n = 9)] of PA or 375 mg of placebo [PLC (n = 10)] daily for eight weeks with RT. Supplements were ingested 60 minutes prior to RT and in the morning on non-RT days. Participants' body composition, muscle size, and lower-body muscle strength were determined before and after training/supplementation...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803632/psycho-physiological-effects-of-television-viewing-during-exercise
#4
Brian C Rider, David R Bassett, Kelley Strohacker, Brittany S Overstreet, Eugene C Fitzhugh, Hollie A Raynor
We propose that enjoyment is an important factor in the adoption and long-term maintenance of exercise. Television (TV) viewing is believed to be a highly enjoyed leisure-time activity, combining it with exercise may make for a more enjoyable exercise experience. The objective of this study was to examine the effects of television (TV) viewing on psychological and physiological variables during a moderate-intensity exercise bout. Twenty-eight insufficiently active (<150 minutes per week of moderate intensity PA and/or 75 minutes of vigorous PA) adults (Age: M = 47...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803631/assessment-of-technical-skills-in-young-soccer-goalkeepers-reliability-and-validity-of-two-goalkeeper-specific-tests
#5
Ricardo Rebelo-Gonçalves, António J Figueiredo, Manuel J Coelho-E-Silva, Antonio Tessitore
The purpose of this study was to evaluate the reproducibility and validity of two new tests designed to examine goalkeeper-specific technique. Twenty-six goalkeepers (14.49 ± 2.52 years old) completed two trial sessions, each separated by one week, to evaluate the reproducibility of the Sprint-Keeper Test (S-Keeper) and the Lateral Shuffle-Keeper Test (LS-Keeper). Construct validity was assessed among forty goalkeepers (14.49 ± 1.71 years old) by competitive level (elite versus non-elite), after controlling for chronological age...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803630/the-supplementation-of-branched-chain-amino-acids-arginine-and-citrulline-improves-endurance-exercise-performance-in-two-consecutive-days
#6
I-Shiung Cheng, Yi-Wen Wang, I-Fan Chen, Gi-Sheng Hsu, Chun-Fang Hsueh, Chen-Kang Chang
The central nervous system plays a crucial role in fatigue during endurance exercise. Branched-chain amino acids (BCAA) could reduce cerebral serotonin synthesis by competing with its precursor tryptophan for crossing the blood brain barrier. Arginine and citrulline could prevent excess hyperammonemia accompanied by BCAA supplementation. This study investigated the combination of BCAA, arginine, and citrulline on endurance performance in two consecutive days. Seven male and three female endurance runners ingested 0...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803629/skills-associated-with-line-breaks-in-elite-rugby-union
#7
Steve den Hollander, James Brown, Michael Lambert, Paul Treu, Sharief Hendricks
The ability of the attacking team to break through the defensive line is a key indicator of success as it creates opportunities to score tries. The aim of this study was to analyse line breaks and identify the associated skills and playing characteristics. The 2013 Super Rugby season (125 games) was analysed, in which 362 line breaks were identified and coded using variables that assessed team patterns and non-contact attacking skills in the phases preceding the line break. There was an average of 3 line breaks per game, with 39% of line breaks resulting in a try...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803628/improved-maximum-strength-vertical-jump-and-sprint-performance-after-8-weeks-of-jump-squat-training-with-individualized-loads
#8
Vanderka Marián, Longová Katarína, Olasz Dávid, Krčmár Matúš, Walker Simon
The purpose of the study was to determine the effects of 8 weeks of jump squat training on isometric half squat maximal force production (Fmax) and rate of force development over 100ms (RFD100), countermovement jump (CMJ) and squat jump (SJ) height, and 50 m sprint time in moderately trained men. Sixty eight subjects (~21 years, ~180 cm, ~75 kg) were divided into experimental (EXP; n = 36) and control (CON, n = 32) groups. Tests were completed pre-, mid- and post-training. EXP performed jump squat training 3 times per week using loads that allowed all repetitions to be performed with ≥90% of maximum average power output (13 sessions with 4 sets of 8 repetitions and 13 sessions with 8 sets of 4 repetitions)...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803627/muscle-contraction-velocity-a-suitable-approach-to-analyze-the-functional-adaptations-in-elite-soccer-players
#9
Irineu Loturco, Lucas A Pereira, Ronaldo Kobal, Katia Kitamura, Rodrigo Ramírez-Campillo, Vinicius Zanetti, Cesar C Cal Abad, Fabio Y Nakamura
Tensiomyography (TMG) has been used as a simple and non-invasive tool to assess the mechanical properties of skeletal muscles. The TMG-derived velocity of contraction (Vc), which can be calculated from the ratio between maximal radial displacement and the sum of contraction time and delay time, has been proposed for evaluating athletes. However, its sensitivity to training effects and possible relation with changes in soccer players' neuromuscular performance have not yet been addressed. To test this possibility, twenty-two male Brazilian elite soccer players were assessed using TMG-derived Vc, unloaded squat jump, countermovement jump and drop jump at 45 cm, loaded jump squat and linear (20 m) and change of direction (COD) sprint tests, prior to and after an 8-week period, between two consecutive official tournaments, during which the concurrency between endurance and strength-power training commonly impairs neuromuscular capacities...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803626/body-fat-and-physical-activity-modulate-the-association-between-sarcopenia-and-osteoporosis-in-elderly-korean-women
#10
Inhwan Lee, Jinkyung Cho, Youngyun Jin, Changduk Ha, Taehee Kim, Hyunsik Kang
This study examined whether modifiable lifestyle factors, such as body fatness and physical activity, modulate the association between sarcopenia and osteoporosis. In a cross-sectional design, 269 postmenopausal women, aged 65 years and older, underwent dual-energy X-ray absorptiometry (DEXA) scans to measure their body fat percentage, total fat mass, total fat-free mass, appendicular lean mass, bone mineral density (BMD) and bone mineral content. The participants wore a uniaxial accelerometer for seven consecutive days to quantify daily physical activity...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803625/effects-of-different-intensities-of-endurance-exercise-in-morning-and-evening-on-the-lipid-metabolism-response
#11
Hyeon-Ki Kim, Karina Ando, Hiroki Tabata, Masayuki Konishi, Masaki Takahashi, Mio Nishimaki, Mi Xiang, Shizuo Sakamoto
To study the effects of different exercise intensity performed at different exercise times on lipid metabolism response during prolonged exercise. Nine young men performed endurance exercise at different exercise intensities (60%VO2max or Fatmax) in the morning (9 am to 10 am) or evening (5 pm to 6 pm); blood samples were collected before exercise and immediately and one and two hours after exercise completion. Expired gas was analyzed from the start of exercise until two hours after exercise completion. There were no significant changes in catecholamine (adrenaline and noradrenaline) and free fatty acid levels between morning and evening trials for each endurance exercise intensity...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803624/effect-of-autonomy-support-on-self-determined-motivation-in-elementary-physical-education
#12
Yu-Kai Chang, Senlin Chen, Kun-Wei Tu, Li-Kang Chi
Using the quasi-experimental design, this study examined the effect of autonomy support on self-determined motivation in elementary school physical education (PE) students. One hundred and twenty six participants were assigned to either the autonomy support group (n = 61) or the control group (n = 65) for a six-week intervention period. Perceived teacher autonomy, perceived autonomy in PE, and self-determined motivation in PE were pre- and post-tested using validated questionnaires. Significant increases in perceived teacher autonomy and perceived autonomy in PE were observed in the autonomy support group, but not in the control group...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803623/psycho-physiological-responses-of-obese-adolescents-to-an-intermittent-run-test-compared-with-a-20-m-shuttle-run
#13
Olivier Rey, Christophe Maïano, Caroline Nicol, Charles-Symphorien Mercier, Jean-Marc Vallier
Among the running field tests that measure aerobic fitness indirectly, the 20-m shuttle run test is the one most commonly used among obese youth. However, this back and forth running test induces premature cessation of exercise in this population. The present study aimed to examine the psycho-physiological responses of obese adolescents to an intermittent (15-15) progressive and maximal run test as compared with a continuous shuttle run test. Eleven obese adolescents (age: 14-15 years; BMI = 34.01 ± 5.30 kg·m(-2)) performed both tests...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803622/effects-of-mental-imagery-on-muscular-strength-in-healthy-and-patient-participants-a-systematic-review
#14
REVIEW
Maamer Slimani, David Tod, Helmi Chaabene, Bianca Miarka, Karim Chamari
The aims of the present review were to (i) provide a critical overview of the current literature on the effects of mental imagery on muscular strength in healthy participants and patients with immobilization of the upper extremity (i.e., hand) and anterior cruciate ligament (ACL), (ii) identify potential moderators and mediators of the "mental imagery-strength performance" relationship and (iii) determine the relative contribution of electromyography (EMG) and brain activities, neural and physiological adaptations in the mental imagery-strength performance relationship...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803621/mean-blood-pressure-assessment-during-post-exercise-result-from-two-different-methods-of-calculation
#15
Gianmarco Sainas, Raffaele Milia, Girolamo Palazzolo, Gianfranco Ibba, Elisabetta Marongiu, Silvana Roberto, Virginia Pinna, Giovanna Ghiani, Filippo Tocco, Antonio Crisafulli
At rest the proportion between systolic and diastolic periods of the cardiac cycle is about 1/3 and 2/3 respectively. Therefore, mean blood pressure (MBP) is usually calculated with a standard formula (SF) as follows: MBP = diastolic blood pressure (DBP) + 1/3 [systolic blood pressure (SBP) - DBP]. However, during exercise this proportion is lost because of tachycardia, which shortens diastole more than systole. We analysed the difference in MBP calculation between the SF and a corrected formula (CF) which takes into account changes in the diastolic and systolic periods caused by exercise-induced tachycardia...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803620/a-comparison-of-stride-length-and-lower-extremity-kinematics-during-barefoot-and-shod-running-in-well-trained-distance-runners
#16
Peter Francis, James Ledingham, Sarah Clarke, D J Collins, Philip Jakeman
Stride length, hip, knee and ankle angles were compared during barefoot and shod running on a treadmill at two speeds. Nine well-trained (1500m time: 3min:59.80s ± 14.7 s) male (22 ±3 years; 73 ±9 kg; 1.79 ±0.4 m) middle distance (800 m - 5,000 m) runners performed 2 minutes of running at 3.05 m·s(-1) and 4.72 m·s(-1) on an treadmill. This approach allowed continuous measurement of lower extremity kinematic data and calculation of stride length. Statistical analysis using a 2X2 factorial ANOVA revealed speed to have a main effect on stride length and hip angle and footwear to have a main effect on hip angle...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803619/effect-of-different-seat-heights-during-an-incremental-sit-to-stand-exercise-test-on-peak-oxygen-uptake-in-young-healthy-women
#17
Keisuke Nakamura, Yuya Nagasawa, Shoji Sawaki, Yoshiharu Yokokawa, Masayoshi Ohira
'Sit-to-stand' exercise uses the repetitive motion of standing up and sitting down in a chair, a common activity of daily living. A new assessment using an incremental sit-to-stand exercise test employs an external sound to control the speed of standing-up and allows increases in work rate. The aims of the study were to examine the effect of different seat heights on peak oxygen uptake (peak VO2) during an incremental sit-to-stand exercise and to assess any difference between peak VO2 values during incremental sit-to-stand exercise compared with a cycle ergometer test...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803618/effect-of-3-different-applications-of-kinesio-taping-denko%C3%A2-on-electromyographic-activity-inhibition-or-facilitation-of-the-quadriceps-of-males-during-squat-exercise
#18
Júlio C Serrão, Bruno Mezêncio, João G Claudino, Rafael Soncin, Pedro L Sampaio Miyashiro, Eric P Sousa, Eduardo Borges, Vinícius Zanetti, Igor Phillip, Luiz Mochizuki, Alberto C Amadio
: Kinesio taping consists of a technique which uses the application of an elastic adhesive tape. It has become a widely used rehabilitation modality for the prevention and treatment of musculoskeletal disorders. The objective of this study was to verify the effect of the application of Kinesio Taping Denko(®) in three conditions (facilitation, inhibition, and placebo) on the electromyographic activity of the quadriceps and hamstrings muscles on facilitating or inhibiting the muscle function and on the perceived exertion during the barbell back squat exercise in healthy male subjects...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803617/the-relationship-of-practice-exposure-and-injury-rate-on-game-performance-and-season-success-in-professional-male-basketball
#19
Toni Caparrós, Eduard Alentorn-Geli, Gregory D Myer, Lluís Capdevila, Kristian Samuelsson, Bruce Hamilton, Gil Rodas
The objectives of this study were to determine the relationship among game performance, injury rate, and practice exposure in a professional male basketball team. A retroospective analysis of prospective collected data was conducted over seven consecutive seasons (2007/2008 to 2013/2014). Data collection included sports performance during competition (statistical evaluation), injury rate, and total exposure (games and practices). Over the surveillance period, 162 injuries (91 practice; 71 matches) occurred over 32,668 hours of exposure (556 games and 2005 practices)...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803616/reliability-and-validity-of-the-inline-skating-skill-test
#20
Ivan Radman, Lana Ruzic, Viktoria Padovan, Vjekoslav Cigrovski, Hrvoje Podnar
This study aimed to examine the reliability and validity of the inline skating skill test. Based on previous skating experience forty-two skaters (26 female and 16 male) were randomized into two groups (competitive level vs. recreational level). They performed the test four times, with a recovery time of 45 minutes between sessions. Prior to testing, the participants rated their skating skill using a scale from 1 to 10. The protocol included performance time measurement through a course, combining different skating techniques...
September 2016: Journal of Sports Science & Medicine
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