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Journal of Sports Science & Medicine

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https://www.readbyqxmd.com/read/29769835/correlations-between-angular-velocities-in-selected-joints-and-velocity-of-table-tennis-racket-during-topspin-forehand-and-backhand
#1
Ziemowit Bańkosz, Sławomir Winiarski
The aim of this study was to determine the correlations between angular velocities in individual joints and racket velocity for different topspin forehand and backhand strokes in table tennis. Ten elite female table tennis players participated, presenting different kinds of topspin forehands and backhands - after a no-spin ball (FH1, BH1), after a backspin ball (FH2, BH2) and "heavy" topspin (FH3, BH3). Range of motion was measured with the BTS Smart-E (BTS Bioengineering, Milan, Italy) motion analysis system with a specially developed marker placement protocol for the upper body parts and an acoustic sensor attached to the racket to identify ball-racket contact...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769834/continuous-knee-cooling-affects-functional-hop-performance-a-randomized-controlled-trial
#2
Bruno Tassignon, Ben Serrien, Kevin De Pauw, Jean-Pierre Baeyens, Romain Meeusen
Cryotherapy is widely used in sports and rehabilitation to aid recovery and injury management. The purpose was to examine if a low temperature computer controlled continuous knee cooling protocol (10°C) for one hour and a moderate continuous knee cooling protocol (18°C) for one hour affected neuromuscular activity and functional performance tests. We used a randomized controlled study design. Twenty healthy male subjects (age = 24 ± 3 years) were included and randomized into 2 groups (10°C and 18°C). On day one, participants performed a maximal voluntary contraction of the quadriceps (MVC), single leg hop for distance (SLHD), and crossover hop for time (COHT) with both legs before and after cooling of their right leg...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769833/effects-of-knee-alignments-and-toe-clip-on-frontal-plane-knee-biomechanics-in-cycling
#3
Guangping Shen, Songning Zhang, Hunter J Bennett, James C Martin, Scott E Crouter, Eugene C Fitzhugh
Effects of knee alignment on the internal knee abduction moment (KAM) in walking have been widely studied. The KAM is closely associated with the development of medial knee osteoarthritis. Despite the importance of knee alignment, no studies have explored its effects on knee frontal plane biomechanics during stationary cycling. The purpose of this study was to examine the effects of knee alignment and use of a toe clip on the knee frontal plane biomechanics during stationary cycling. A total of 32 participants (11 varus, 11 neutral, and 10 valgus alignment) performed five trials in each of six cycling conditions: pedaling at 80 rpm and 0...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769832/validity-and-reliability-of-the-powertap-p1-pedals-power-meter
#4
Jesús G Pallarés, José Ramón Lillo-Bevia
To validate the new PowerTap P1® pedals power meter (PP1), thirty-three cyclists performed 12 randomized and counterbalanced graded exercise tests (100-500 W), at 70, 85 and 100 rev·min-1 cadences, in seated and standing positions. A scientific SRM system and a pair of PP1 pedals continuously recorded cadence and power output data. Significantly lower power output values were detected for the PP1 compared to the SRM for all workloads, cadences, and pedalling conditions (2-10 W, p < 0.05), except for the workloads ranged between 150 W to 350 W at 70 rev·min-1 in seated position (p > 0...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769831/improvement-of-functional-ankle-properties-following-supplementation-with-specific-collagen-peptides-in-athletes-with-chronic-ankle-instability
#5
Patrick Dressler, Dominic Gehring, Denise Zdzieblik, Steffen Oesser, Albert Gollhofer, Daniel König
Following an initial ankle sprain it is not unlikely that chronic ankle instability (CAI) will develop. CAI is associated with impaired perceived functional and mechanical properties of the ligaments. Nutritional supplementation with collagen peptides has been shown to improve the functional and mechanical properties of the connective tissue. The purpose of this study was to investigate the effectiveness of specific collagen peptide supplementation (SCP) to improve ankle stability in athletes with CAI. 50 male and female athletes with CAI completed a randomized, double-blinded and placebo-controlled study with a daily oral administration of either 5 g SCP or 5 g placebo (Maltodextrin) over a period of six months...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769830/low-external-workloads-are-related-to-higher-injury-risk-in-professional-male-basketball-games
#6
Toni Caparrós, Martí Casals, Álvaro Solana, Javier Peña
The primary purpose of this study was to identify potential risk factors for sports injuries in professional basketball. An observational retrospective cohort study involving a male professional basketball team, using game tracking data was conducted during three consecutive seasons. Thirty-three professional basketball players took part in this study. A total of 29 time-loss injuries were recorded during regular season games, accounting for 244 total missed games with a mean of 16.26 ± 15.21 per player and season...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769829/creatine-supplementation-supports-the-rehabilitation-of-adolescent-fin-swimmers-in-tendon-overuse-injury-cases
#7
Imre Juhasz, Judit Plachy Kopkane, Pal Hajdu, Gabor Szalay, Bence Kopper, Jozsef Tihanyi
Our purpose was to investigate the effect of creatine (Cr) supplementation on regeneration periods in tendon overuse injury rehabilitation of adolescent fin swimmers. The participants of this study were injured adolescent competitive fin swimmers (n = 18). The subjects were randomly assigned the creatine (CR) or placebo (PL) groups with a double-blind research design. The subjects were given Cr supplementation or received the placebo as part of the conservative treatment of the tendinopathy. We measured the segmental lean mass (SLM;kg), the ankle plantar flexion peak torque (PFT;N·m), the pain intensity (NRS;values), prior to immobilization, after immobilization (R2) and after the 2nd (R4) and 4th (R6) weeks of the rehabilitation period of the injured limb...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769828/the-effect-of-half-time-re-warm-up-duration-on-intermittent-sprint-performance
#8
Takuma Yanaoka, Kyoko Kashiwabara, Yuta Masuda, Jumpei Yamagami, Kuran Kurata, Shun Takagi, Masashi Miyashita, Norikazu Hirose
The purpose of the present study was to investigate the effect of different durations of half-time re-warm up (RW) on intermittent sprint performance. Using a randomized crossover design, 13 healthy men performed three trials, which consisted of two, 40-min intermittent exercises separated by a 15-min half-time. Half-time interventions were 15 min of seated rest (Control), 7 min of cycling at 70% of maximal heart rate (HRmax ) (7 min RW), and 3 min of cycling at 70% of HRmax (3 min RW). The second 40-min intermittent exercise as an exercise performance test was the Cycling Intermittent-Sprint Protocol (CISP), which consisted of 10 s of rest, 5 s of maximal sprint, and 105 s of low-intensity exercise at 50% of VO2max , with the cycles repeated over the 40-min duration...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769827/effects-of-a-4-week-very-low-carbohydrate-diet-on-high-intensity-interval-training-responses
#9
Lukas Cipryan, Daniel J Plews, Alessandro Ferretti, Phil B Maffetone, Paul B Laursen
The purpose of the study was to examine the effects of altering from habitual mixed Western-based (HD) to a very low-carbohydrate high-fat (VLCHF) diet over a 4-week timecourse on performance and physiological responses during high-intensity interval training (HIIT). Eighteen moderately trained males (age 23.8 ± 2.1 years) consuming their HD (48 ± 13% carbohydrate, 17 ± 3% protein, 35 ± 9% fat) were assigned to 2 groups. One group was asked to remain on their HD, while the other was asked to switch to a non-standardized VLCHF diet (8 ± 3% carbohydrate, 29 ± 15% protein, 63 ± 13% fat) for 4 weeks...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769826/effects-of-gymnastics-activities-on-bone-accrual-during-growth-a-systematic-review
#10
REVIEW
Jaak Jürimäe, Rita Gruodyte-Raciene, Adam D G Baxter-Jones
The amount of bone gained during childhood and adolescence impacts greatly on lifetime skeletal health. The purpose of this review is to summarize current evidence of the effects of gymnastics activities on bone mineral accrual during growth and to describe possible factors that influence bone mineral gains. The PubMed and SportDiscus databases were searched, and a total of 24 articles met the selection criteria and were included in this review. Artistic and rhythmic gymnasts presented higher bone mineral density and content values compared to untrained controls, despite possible negative effects associated with hormonal levels, dietary restrictions and body fat...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769825/balancing-demands-and-resources-in-sport-adaptation-and-validation-of-the-demand-induced-strain-compensation-questionnaire-for-use-in-sport
#11
Yannick A Balk, Jan De Jonge, Wido G M Oerlemans, Sabine A E Geurts, David Fletcher, Christian Dormann
Too high demands, combined with a lack of resources, are often detrimental to athletic health and well-being. However, a valid and reliable instrument to investigate different dimensions of demands and resources in sport is currently unavailable. Therefore, the present study examines the psychometric properties of an existing and well-validated survey instrument on demands and resources at task-level that was adapted to sport. This instrument, the Demand-Induced Strain Compensation Questionnaire for Sport (DISQ-SPORT), was empirically tested among 1,101 athletes (416 females and 685 males) from a variety of sports and in different languages...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769824/immune-response-in-women-during-exercise-in-the-heat-a-spotlight-on-oral-contraception
#12
Brianna Larsen, Amanda J Cox, Karlee Quinn, Rhiannon Fisher, Clare Minahan
This study compared the immune and stress response of oral contraceptive users (WomenOC; n = 9) to normally-menstruating women (WomenNM; n = 9) at rest and during exercise in temperate (TEMP; 22°C) and hot (HEAT; 35°C) conditions. Participants performed a 3-stage cycling trial in each condition at 90% (Stage 1; 30 min), 135% (Stage 2; 15 min), and 180% (Stage 3; 7.5 min) of lactate threshold 1. C-reactive protein (CRP) and immune cell counts were measured at rest, and serum cytokines (IL-1β, IL-1RA, IL-6, IL-8, IL-10, and TNF-α) and salivary cortisol were evaluated before and after exercise in both the TEMP and HEAT conditions...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769823/relationship-between-achilles-tendon-stiffness-and-ground-contact-time-during-drop-jumps
#13
Mohamed Abdelsattar, Andreas Konrad, Markus Tilp
The purpose of this study was to investigate the relationship between Achilles tendon stiffness and ground contact time (GCT) during drop jumps. The property of "springiness" and a short GCT during the movement is required in several types of sports. Therefore, a stiff tendon might be advantageous due to the quick force transmission from the muscle to the bone. Hence, a secondary aim was to relate Achilles tendon stiffness with squat jump (SJ) and counter movement jump (CMJ) performance, respectively...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769822/maturity-status-strongly-influences-the-relative-age-effect-in-international-elite-under-9-soccer
#14
Lisa Müller, Josef Gehmaier, Christoph Gonaus, Christian Raschner, Erich Müller
The aim of the study was to assess the role of the relative age effect (RAE) and to investigate the influence of the biological maturity status on the RAE in international under-9 soccer. The birth dates of 222 male participants of the U9 Eurochampionship Soccer Tournament in Vienna in 2016 were analyzed and divided into four relative age quarters (Q1-Q4) and the biological maturity status was assessed with the age at peak height velocity (APHV) method. Based on the mean±standard deviation of the APHV, the athletes were divided into three groups of maturity: early, normal and late maturing...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769821/validity-and-reliability-of-surface-electromyography-measurements-from-a-wearable-athlete-performance-system
#15
Scott K Lynn, Casey M Watkins, Megan A Wong, Katherine Balfany, Daniel F Feeney
The Athos ® wearable system integrates surface electromyography (sEMG ) electrodes into the construction of compression athletic apparel. The Athos system reduces the complexity and increases the portability of collecting EMG data and provides processed data to the end user. The objective of the study was to determine the reliability and validity of Athos as compared with a research grade sEMG system. Twelve healthy subjects performed 7 trials on separate days (1 baseline trial and 6 repeated trials). In each trial subjects wore the wearable sEMG system and had a research grade sEMG system's electrodes placed just distal on the same muscle, as close as possible to the wearable system's electrodes...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769820/multivariate-relationships-among-morphology-fitness-and-motor-coordination-in-prepubertal-girls
#16
Leonardo G O Luz, Manuel J Coelho-E-Silva, João P Duarte, João Valente-Dos-Santos, Aristides Machado-Rodrigues, André Seabra, Bruno C M Carmo, Roel Vaeyens, Renaat M Philippaerts, Sean P Cumming, Robert M Malina
Motor coordination and physical fitness are multidimensional concepts which cannot be reduced to a single variable. This study evaluated multivariate relationships among morphology, physical fitness and motor coordination in 74 pre-pubertal girls 8.0-8.9 years of age. Data included body dimensions, eight fitness items and four motor coordination tasks (KTK battery). Maturity status was estimated as percentage of predicted mature stature attained at the time of observation. Canonical correlation analysis was used to examine the relationships between multivariate domains...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769819/structural-and-biomechanical-adaptations-to-free-fall-landing-in-hindlimb-cortical-bone-of-growing-female-rats
#17
Hsin-Shih Lin, Ho-Seng Wang, Hung-Ta Chiu, Kuang-You B Cheng, Ar-Tyan Hsu, Tsang-Hai Huang
The purpose of the study was to investigate the adaptation process of hindlimb cortical bone subjected to free-fall landing training. Female Wistar rats (7 weeks old) were randomly assigned to four landing (L) groups and four age-matched control (C) groups (n = 12 per group): L1, L2, L4 L8, C1, C2, C4 and C8. Animals in the L1, L2, L4 and L8 groups were respectively subjected to 1, 2, 4 and 8 weeks of free-fall-landing training (40 cm height, 30 times/day and 5 days/week) while the C1, C2, C4 and C8 groups served as age-matched control groups...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769818/carbohydrate-mouth-rinse-and-hydration-strategies-on-cycling-performance-in-30-km-time-trial-a-randomized-crossover-controlled-trial
#18
Amanda M J Ferreira, Luiz F Farias-Junior, Thaynan A A Mota, Hassan M Elsangedy, Aline Marcadenti, Telma M A M Lemos, Alexandre H Okano, Ana P T Fayh
The aim of this study was to investigate whether carbohydrate mouth rinse (CMR) improves physical performance of cyclists during a 30-km time trial test and its influence on water balance compared to other strategies of fluid intake. Eleven recreationally trained male cyclists completed a 30 km time trial cycle ergometer under three experimental interventions: (a) CMR, (b) drinking to replace all weight loss (DWL), and (c) drinking "ad libitum" (DAL). Time to complete the 30 km time trial, heart rate, average power, velocity, weight loss, urine color, urine density and pH were evaluated...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769817/reliability-of-single-leg-balance-and-landing-tests-in-rugby-union-prospect-of-using-postural-control-to-monitor-fatigue
#19
Jordan C Troester, Jason G Jasmin, Rob Duffield
The present study examined the inter-trial (within test) and inter-test (between test) reliability of single-leg balance and single-leg landing measures performed on a force plate in professional rugby union players using commercially available software (SpartaMARS, Menlo Park, USA). Twenty-four players undertook test - re-test measures on two occasions (7 days apart) on the first training day of two respective pre-season weeks following 48h rest and similar weekly training loads. Two 20s single-leg balance trials were performed on a force plate with eyes closed...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769816/the-effect-of-two-different-concurrent-training-programs-on-strength-and-power-gains-in-highly-trained-individuals
#20
Henrik Petré, Pontus Löfving, Niklas Psilander
The effects of concurrent strength and endurance training have been well studied in untrained and moderately-trained individuals. However, studies examining these effects in individuals with a long history of resistance training (RT) are lacking. Additionally, few studies have examined how strength and power are affected when different types of endurance training are added to an RT protocol. The purpose of the present study was to compare the effects of concurrent training incorporating either low-volume, high-intensity interval training (HIIT, 8-24 Tabata intervals at ~150% of VO2max ) or high-volume, medium-intensity continuous endurance training (CT, 40-80 min at 70% of VO2max ), on the strength and power of highly-trained individuals...
June 2018: Journal of Sports Science & Medicine
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