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https://www.readbyqxmd.com/read/29239993/hypoxia-during-resistance-exercise-does-not-affect-physical-performance-perceptual-responses-or-neuromuscular-recovery
#1
Brendan R Scott, Katie M Slattery, Dean V Sculley, Ben J Dascombe
This study aimed to determine whether performing resistance exercise in hypoxia affects markers of physical performance, perceptual responses, and neuromuscular function. Fourteen male subjects (age: 24.6 ± 2.7 yr; height: 179.7 ± 5.9 cm; body mass: 84.6 ± 11.6 kg) with >2 years resistance training experience performed moderate-load resistance exercise in two conditions; normoxia (FIO2 = 0.21) and hypoxia (FIO2 = 0.16). Resistance exercise comprised 3 sets of 10 repetitions of back squats and deadlifts at 60% of 1RM, with 60s inter-set rest...
December 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29239989/a-systematic-review-of-the-association-between-physical-fitness-and-musculoskeletal-injury-risk-part-3-flexibility-power-speed-balance-and-agility
#2
Sarah J de la Motte, Peter Lisman, Timothy C Gribbin, Kaitlin Murphy, Patricia A Deuster
We performed a systematic review and evaluation of the existing scientific literature on the association between flexibility, power, speed, balance, and agility, and musculoskeletal injury (MSK-I) risk in military and civilian populations. MEDLINE, EBSCO, EMBASE, and the Defense Technical Information Center were searched for original studies published from 1970 through 2015 that examined associations between these physical fitness measures (flexibility, power, speed, balance, and agility) and MSK-I. Methodological quality and strength of the evidence were determined following criteria adapted from previously published systematic reviews...
December 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29238806/vertical-jump-height-estimation-algorithm-based-on-vertical-acceleration-profile-characteristics-via-foot-worn-inertial-sensing
#3
Jianren Wang, Junkai Xu, Peter B Shull
Vertical jump height is widely used for assessing motor development, functional ability, and motor capacity. Traditional methods for estimating vertical jump height rely on force plates or optical marker-based motion capture systems limiting assessment to people with access to specialized laboratories. This paper presents a novel algorithm for estimating vertical jump height based on foot-worn inertial sensors. Twenty healthy subjects performed countermovement jumping trials and maximum jump height was determined via inertial sensors located above the toe and under the heel and was compared with the gold standard maximum jump height estimation via optical marker-based motion capture...
December 13, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29233241/protective-knee-braces-and-the-biomechanics-of-the-half-squat-parachute-landing
#4
Di Wu, Chao Zheng, Ji Wu, Longfeng Wang, Xiang Wei, Lizheng Wang
INTRODUCTION: Knee injuries are common among paratroopers and skydivers during landing maneuvers. The aim of this study was to investigate the effects of dropping height and the use of protective knee braces on parachute landing biomechanics. METHODS: The study cohort consisted of 30 male elite paratroopers with formal parachute landing training and more than 2 yr of parachute jumping experience. Each participant was instructed to jump off a platform at two different heights (40 and 80 cm, respectively) and land on force plates in a half-squat posture...
January 1, 2018: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/29214194/data-concerning-the-effect-of-plyometric-training-on-jump-performance-in-soccer-players-a-meta-analysis
#5
Maamer Slimani, Armin Paravlić, Nicola Luigi Bragazzi
Plyometric training (PT) enhances soccer performance, particularly vertical jump. However, the effectiveness of PT depends on various factors. A systematic search of the research literature was conducted for randomized controlled trials (RCTs) studying the effects of PT on countermovement jump (CMJ) height in soccer players. Ten studies were obtained through manual and electronic journal searches (up to April 2017). Significant differences were observed when compared: (1) PT group vs. control group (ES=0.85; 95% CI 0...
December 2017: Data in Brief
https://www.readbyqxmd.com/read/29210955/comparison-between-power-off-ice-test-and-performance-on-ice-anaerobic-testing
#6
Vincent Gosselin Boucher, Andrée-Anne Parent, Fanie St-Jean Miron, Mario Leone, Alain Steve Comtois
The importance of specific testing has been shown in ice hockey performance and the understanding and connection between them may lead to adapting training and follow up in elite athletes. The aim of the present study was to compare two off-ice power tests with performances on ice with a complete professional hockey team. The broad jump test and the vertical jump test were used for the off-ice evaluations, while the SAS-40 and the repeated skate sprint modify (RSSm) tests were used as the performance variables...
November 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29207472/effects-of-%C3%AE-hydroxy-%C3%AE-methylbutyrate-free-acid-supplementation-on-strength-power-and-hormonal-adaptations-following-resistance-training
#7
Abbas Asadi, Hamid Arazi, Katsuhiko Suzuki
BACKGROUND: β-Hydroxy-β-methylbutyrate-free acid (HMB-FA) has been ingested prior to exercise to reduce muscle damage, however the effects of HMB-FA supplementation on hormonal, strength and power adaptation are unclear. METHODS: Sixteen healthy men were matched and randomized into two groups and performed six-week resistance training while supplementing with either HMB-FA or placebo (3 g per day). The subjects were evaluated for 1 repetition maximum (1RM) bench press and leg press and vertical jump (VJ) prior to and after training intervention...
December 2, 2017: Nutrients
https://www.readbyqxmd.com/read/29202784/sprint-and-jump-performance-in-elite-male-soccer-players-following-a-10-week-nordic-hamstring-exercise-protocol-a-randomised-pilot-study
#8
K Krommes, J Petersen, M B Nielsen, P Aagaard, P Hölmich, K Thorborg
OBJECTIVE: The preseason Nordic Hamstring Protocol (NHP) reduces hamstring strain injuries in football players. Despite persisting injury rates, elite clubs are reluctant to apply the NHP often over concerns of negative impacts on performance. This pilot study investigated if sprint or jump-performance outcomes tended to increase or decrease following implementation of the NHP in elite male soccer-players. RESULTS: Nineteen male soccer players from the Danish 1st division were randomised to perform NHP (27 sessions) during pre-season, or to control group (CG)...
December 4, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/29200094/characteristics-of-a-national-level-female-weightlifter-peaking-for-competition-a-case-study
#9
Caleb D Bazyler, Satoshi Mizuguchi, Michael C Zourdos, Kimitake Sato, Ashley A Kavanaugh, Brad H DeWeese, Kevin F Breuel, Michael H Stone
This study investigated physiological and performance changes of a national level 69kg female weightlifter following three competition phases over a 28-week training period. The athlete first trained for a regional championship (weeks 1-12), followed by a local competition (weeks 13-23) and the national championship (weeks 24-28). Body mass, vastus lateralis cross-sectional area, and unloaded and loaded squat jump performance were assessed weekly during each 4-week competition phase. Serum biomarkers, and dynamic mid-thigh pulls were assessed prior to and after each competition phase...
December 1, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29199782/anthropometric-and-physiological-characteristics-of-male-soccer-players-according-to-their-competitive-level-playing-position-and-age-group-a-systematic-review
#10
Maamer Slimani, Pantelis T Nikolaidis
BACKGROUND: The aim of the present systematic review was to profile soccer players' anthropometric, physiological, and physical attributes relative to different competitive levels, playing positions and age groups. METHODS: The systematic search was conducted using different databases and according to the Population/Intervention or Exposure/Comparison/Outcome(s) [PICO] criteria. RESULTS: The present review shows that the somatotype characteristics, percentage (%) of body fat, maximal oxygen uptake (VO2max), repeatedsprint ability (RSA), running speed, strength, and muscular power of the lower limbs were the most powerful discriminators between male soccer players of different competitive levels, playing positions, and age groups...
December 1, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29199778/influence-of-ethnicity-on-vertical-jump-performances-in-male-physical-education-students-a-pilot-study
#11
Elvis Attiogbe, Henry Vandewalle, Tarak Driss
BACKGROUND: The present study aimed to: i) test the possibility of ethnic differences in squat jump (SJ), countermovement jump (CMJ) and countermovement jump with arms swing (CMJA); ii) test the possibility of ethnic differences in the effects of countermovement and arms swing; iii) verify whether the relationships between the different vertical jumps VJ (SJ, CMJ, CMJA) and maximal power (Pmax), determined from a force-velocity test (F-V), were dependent on the ethnicity as previously found for CMJA...
December 1, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29189585/muscle-damage-and-metabolic-responses-to-repeated-sprint-running-with-and-without-deceleration
#12
Clare L Minahan, Daniel P Poke, Jaime Morrison, Phillip M Bellinger
This study aimed to determine whether repeated-sprint running with deceleration aggravates markers of muscle damage or delays the recovery of performance compared to repeated-sprint running without deceleration. Fourteen male team-sport athletes performed two randomly ordered testing sessions on a non-motorised treadmill with one session requiring participants to decelerate (TMd) within 4 s before stopping, or immediately step to the side of the treadmill belt at the completion of each sprint (TMa). Peak and mean velocities, speed decrement, blood lactate concentrations and oxygen uptake were monitored during the repeated-sprint running protocols...
November 16, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29182712/sarcopenia-is-negatively-related-to-high-gravitational-impacts-achieved-from-day-to-day-physical-activity
#13
April Hartley, Celia L Gregson, Kimberly Hannam, Kevin C Deere, Emma M Clark, Jon H Tobias
Background: Sarcopenia has been associated with reduced physical activity (PA). We aimed to determine if sarcopenia, and specific components of muscle size, function and physical performance, are associated with high impacts achieved during habitual PA, as these are related to bone strength in community-dwelling older women. Methods: Participants were older women from the Cohort of Skeletal Health in Bristol and Avon. We defined sarcopenia using the EWGSOP criteria...
November 22, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/29182436/vertical-and-horizontal-jump-capacity-in-international-cerebral-palsy-football-players
#14
Raul Reina, Aitor Iturricastillo, Rafael Sabido, Maria Campayo-Piernas, Javier Yanci
PURPOSE: the aims of the present study were to evaluate the reliability and validity of vertical and horizontal jump tests in football players with cerebral palsy (FPCP), and to analyze the jump performance differences between current IFCPF functional classes (i.e. FT5-FT8). METHODS: One hundred and thirty-two international para-footballers (25.8 ± 6.7 years; 70.0 ± 9.1 kg; 175.7 ± 7.3 cm; 22.8 ± 2.8 kg·m-2; 10.7 ± 7.5 years training experience) participated in the study...
November 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29182434/reactive-strength-index-a-poor-indicator-of-reactive-strength
#15
Robin Healy, Ian Kenny, Drew Harrison
PURPOSE: The primary aim was to assess the relationships between reactive strength measures and associated kinematic and kinetic performance variables achieved during drop jumps. A secondary aim was to highlight issues with the use of reactive strength measures as performance indicators. METHODS: Twenty eight national and international level sprinters, consisting of fourteen men and women, participated in this cross-sectional analysis. Athletes performed drop jumps from a 0...
November 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29181252/comparison-of-dry-needling-vs-sham-on-the-performance-of-vertical-jump
#16
William D Bandy, Russell Nelson, Lisa Beamer
Introduction: Dry needling has been reported to decrease pain in subjects having myofascial trigger points, as well as pain in muscle and connective tissue. Objective: The purpose of the study was to compare the effects on the ability to perform a two-legged vertical jump between a group who received one bout of dry needling and a group who received one bout of a sham treatment. Methods: Thirty-five healthy students (19 males, 16 females) were recruited to participate in this study (mean age 22...
October 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29176384/the-use-of-mobile-applications-to-collect-data-in-sport-health-and-exercise-science-a-narrative-review
#17
Daniel J Peart, Carlos Balsalobre-Fernández, Matthew P Shaw
Mobile devices are ubiquitous in the population, and most have the capacity to download applications (apps). Some apps have been developed to collect physiological, kinanthropometric and performance data, however the validity and reliability of such data is often unknown. An appraisal of such apps is warranted as mobile apps may offer an alternative method of data collection for practitioners and athletes with money, time and space constraints. This article identifies and critically reviews the commercially available apps that have been tested in the scientific literature, finding evidence to support the measurement of resting heart through photoplethysmograpy, heart rate variability, range of motion, barbell velocity, vertical jump, mechanical variables during running, and distances covered during walking, jogging and running...
November 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29176383/effect-of-jump-interval-training-on-kinematics-of-the-lower-limbs-and-running-economy
#18
Jonathan Ache-Dias, Juliano Dal Pupo, Rodolfo A Dellagrana, Anderson S Teixeira, Luis Mochizuki, Antônio R P Moro
This study analyzed the effects of the addition of jump interval training (JIT) to continuous endurance training (40-min running at 70% of peak aerobic velocity, three times per week for four weeks) on kinematic variables and running economy (RE) during submaximal constant-load running. Eighteen recreational runners, randomized into control (CG) or experimental (EG) groups performed the endurance training. In addition, the EG performed the JIT twice per week, which consisted of four to six bouts of continuous vertical jumping (30s) with five-minute intervals...
November 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29172028/neural-adaptations-in-quadriceps-muscle-after-4-weeks-of-local-vibration-training-in-young-versus-old-subjects
#19
Robin Souron, Thibault Besson, Thomas Lapole, Guillaume Y Millet
This study investigated the effects of a 4-week local vibration training (LVT) on the function of the knee extensors and corticospinal properties in healthy young and old subjects. Seventeen subjects (9 young and 8 old) performed 3 testing sessions: before (PRE1) and after (PRE2) a 4-week resting period to control the repeatability of the data as well as after the LVT (POST). Jump performance, maximal voluntary force (MVC) and electromyographic (EMG) activity on vastus lateralis (VL) and rectus femoris (RF) muscles were assessed...
November 24, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29167568/elite-long-jumpers-with-below-the-knee-prostheses-approach-the-board-slower-but-take-off-more-effectively-than-non-amputee-athletes
#20
Steffen Willwacher, Johannes Funken, Kai Heinrich, Ralf Müller, Hiroaki Hobara, Alena M Grabowski, Gert-Peter Brüggemann, Wolfgang Potthast
The use of technological aids to improve sport performance ('techno doping') and inclusion of Paralympic athletes in Olympic events are matters of ongoing debate. Recently, a long jumper with a below the knee amputation (BKA) achieved jump distances similar to world-class athletes without amputations, using a carbon fibre running-specific prosthesis (RSP). We show that athletes with BKA utilize a different, more effective take-off technique in the long jump, which provided the best athlete with BKA a performance advantage of at least 0...
November 22, 2017: Scientific Reports
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