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Journal of Strength and Conditioning Research

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https://www.readbyqxmd.com/read/28081034/the-effects-of-the-removal-of-electronic-devices-for-48-hours-on-sleep-in-elite-judo-athletes
#1
Ian C Dunican, David T Martin, Shona L Halson, Reid Reale, Brian Dawson, John Caldwell, Maddison J Jones, Peter R Eastwood
OBJECTIVE: This study examined the effects of the removal of electronic devices (i.e., smartphones, etc.) for 48 hours on sleep quality and next-day athletic and cognitive performance in elite Judo athletes. PARTICIPANTS: Over 6 days and nights, 23 eliteAustralian Judo athletes were monitored while attending a camp at the Australian Institute of Sport (AIS). In 14 athletes all electronic devices were removed on days 3 & 4 (i.e. for 48 hours: the 'device-restricted group') while 9 were permitted to use their devices throughout the camp (the 'control group')...
January 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28081033/performance-aspects-and-physiological-responses-in-male-amateur-boxing-competitions-a-brief-review
#2
Maamer Slimani, Helmi Chaabène, Philip Davis, Emerson Franchini, Karim Chamari
Boxing is one of the most popular striking combat sports in the world. The aim of this review was to present data concerning performance analysis (time-motion and technical/tactical analysis) and physiological responses (i.e., blood lactate concentration [BLC], heart rate and/or oxygen consumption) during novice and elite male simulated and official amateur boxing competitions in any age category. The present review shows that boxing competition is a high-intensity intermittent striking combat sport. Typically, the activity-to-rest ratio was higher in elite (18:1) than novice (9:1) boxers and significant differences were observed between rounds (1 round=16:1, 2 round=8:1, and 3 round=6:1) in novice boxers...
January 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28079671/outcomes-of-exercise-training-following-the-use-of-a-birthing-ball-during-pregnancy-and-delivery
#3
Danielle Fournier, Gloria Feeney, Marie-Eve Mathieu
INTRODUCTION: Using a birthing ball (BB) is an exercise form that is growing in popularity. Improved delivery outcomes have been recently reported with as little a 6-8 hours of training per week; however, little is known regarding lower and higher training levels. The aim of the current study was to document whether more time spent training with a BB resulted in improved delivery outcomes for the mother and the newborn. METHODS: This quasi-experimental study was conducted with a sample of women who participated in one to 28 supervised exercise classes during pregnancy according to the Ballon Forme program offered in non-clinical settings (http://ballonforme...
January 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28030533/physical-and-physiological-profile-of-wrestler-athletes-short-review
#4
Helmi Chaabene, Yassine Negra, Raja Bouguezzi, Bessem Mkaouer, Emerson Franchini, Ursula Julio, Younés Hachana
Wrestling is one of the oldest combat sports, disputed since the ancient Greek Olympic Games. This combat sport discipline has caught the attention of scientists since 1943 which is the date that matches the appearance of the first scientific research dealing with wrestling. The current short review aimed to summarize and critically analyze the scientific literature related to wrestling's physical and physiological attributes and to provide practical recommendations for testing/training together with new perspective and areas of future scientific research...
December 24, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28030532/the-application-of-a-simple-surveillance-method-for-detecting-the-prevalence-and-impact-of-overuse-injuries-in-professional-men-s-basketball
#5
K Weiss, M McGuigan, T Besier, C Whatman
The aim of this study was to use the Oslo Sports Trauma Research Centre (OSTRC) overuse injury questionnaire to record overuse injuries over a single season for a men's professional basketball team in order to; (i) assess the prevalence and severity of overuse injuries and (ii) determine the efficacy of this method in identifying overuse injuries in comparison to the team physiotherapist's detection of these injuries. Thirteen athletes from a men's professional basketball team participated in this study. The self-reported, OSTRC injury questionnaire was used to record overuse conditions of the ankle, knee, lower back over an entire 24-week season...
December 24, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28030531/does-focus-of-attention-improve-snatch-lift-kinematics
#6
Kyle S Schutts, Will Wu, Anthony Vidal, Jamie Hiegel, James Becker
Recent motor control literature has demonstrated that using verbal instructions to direct a performer's attention externally (i.e. toward the movement outcome) enhances motor skill performance. The purpose of this study was to investigate how an athlete's focus of attention impacts kinematic performance of the snatch. Using a counterbalanced within-participant design, 12 competitively trained athletes (8 male, 4 female) performed 2 instructional blocks of 3 snatch repetitions at 80% of their most recent training 1RM...
December 24, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28033125/validity-of-bmi-based-body-fat-equations-in-men-and-women-a-four-compartment-model-comparison
#7
Brett S Nickerson, Michael R Esco, Phillip A Bishop, Michael V Fedewa, Ronald L Snarr, Brian M Kliszczewicz, Kyung-Shin Park
The purpose of this study was to compare body mass index (BMI)-based body fat percentage (BF%) equations and skinfolds to a four-compartment (4C) model in men and women. One hundred and thirty adults (63 women and 67 men) volunteered to participate (age = 23±5 years). BMI was calculated as weight (kg) divided by height squared (m). BF% was predicted with the BMI-based equations of Jackson et al. (BMIJA), Deurenberg et al. (BMIDE), Gallagher et al. (BMIGA), Zanovec et al. (BMIZA), Womersley and Durnin (BMIWO) and from 7-site skinfolds using the generalized skinfold equation of Jackson et al...
December 20, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28033124/variances-in-strength-and-conditioning-practice-in-elite-rugby-union-between-the-northern-and-southern-hemispheres
#8
Thomas W Jones, Andrew Smith, Lindsay S Macnaughton, Duncan N French
The strength and conditioning (S&C) practices in elite Rugby Union (RU) have previously been detailed. There is also research which indicates playing styles can differ between Northern hemisphere (NH) and Southern hemisphere (SH) teams. It is not presently known if these variances in playing styles are reflected in the S&C practices of those supporting NH and SH teams. As such, the present study examines any variances in S&C practices between those supporting NH and SH elite level teams. A validated questionnaire was employed that comprised 7 sections; personal details, physical testing, strength and power development, concurrent training, unique aspects of the programme and any further relevant information regarding prescribed training programmes...
December 20, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28033123/accuracy-of-a-modified-lactate-minimum-test-and-reverse-lactate-threshold-test-to-determine-maximal-lactate-steady-state
#9
Patrick Wahl, Christian Manunzio, Florian Vogt, Sarah Strütt, Prisca Volmary, Wilhelm Bloch, Joachim Mester
This study evaluated the accuracy of a modified-lactate-minimum-test (mLMT), a modified-reverse-lactate-threshold-test (mRLT), in comparison to two established threshold concepts (OBLA & mDmax) to determine power output at maximal-lactate-steady-state (MLSS) in cycling. Nineteen subjects performed an mLMT, an mRLT, a graded-exercise-test (100W start, +20W every 3 min) and 3 or more constant-load tests of 30 minutes to determine power output at MLSS. The mLMT and mRLT both consisted of an initial lactate priming-segment, followed by a short recovery phase...
December 20, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28033122/validity-of-the-30-15-intermittent-fitness-test-in-sub-elite-female-athletes
#10
Lyndell Bruce, Simon Moule
The purpose of the current study was to assess the suitability of the 30-15 IFT as a test in netball using female athletes. 26 female sub-elite netballers (mean age = 19.7 ± 4.6 years, mean height = 176.0 ± 6.1 cm, mean body mass = 69.7 ± 9.3 kg) completed the yo-yo intermittent recovery test level 1 (yo-yo IRT1) and the 30-15 Intermittent Fitness Test (30-15 IFT). Participants performed both assessments one week apart prior to the intervention and both tests one week apart following the training intervention (for a total of four testing sessions)...
December 20, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28002181/effects-of-caffeine-ingestion-on-skill-performance-during-an-international-female-rugby-sevens-competition
#11
Javier Portillo, Juan Del Coso, Javier Abián-Vicén
The aim of this study was to establish the effects of a caffeine-containing energy drink on skills and technical performance during a match in female elite rugby sevens players. On two non-consecutive days of a friendly tournament, sixteen women from the Spanish national rugby-sevens team (mean age = 23±2 yr) ingested 3 mg of caffeine per kg of body mass in the form of an energy drink or the same drink without caffeine (placebo drink). After sixty minutes for caffeine absorption, participants played three rugby sevens matches against another national team...
December 8, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28002180/effect-of-whole-body-vibration-on-neuromuscular-activation-of-leg-muscles-during-dynamic-exercises-in-individuals-with-stroke
#12
Lin-Rong Liao, Marco Yiu Chung Pang
This study examined the leg muscle activity during exposure to different whole-body vibration (WBV) intensities while performing various dynamic exercises in chronic stroke patients. Thirty chronic stroke patients performed a series of dynamic exercises under three conditions: 1) low-intensity WBV [peak acceleration: 0.96 units of gravity of Earth (g)], 2) high-intensity WBV (1.61g), and 3) no WBV (NWBV). Neuromuscular activation was recorded with surface electromyography (EMG) on bilateral biceps femoris (BF), vastus lateralis (VL), tibialis anterior (TA) and gastrocnemius (GS) in both legs and was reported as EMGrms (root mean square) normalized to % maximal voluntary contraction...
December 8, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28002179/game-profile-based-training-in-soccer-a-new-field-approach
#13
Antonio Dello Iacono, Domenico Martone, Drazen Cular, Mirjana Milic, Johnny Padulo
The aim of the study was to profile and compare the time-motion, physiological, and neuromuscular responses of both national youth league (NYL) and UEFA Youth League (UYL) matches with those of an experimental game-profile-based training (GPBT) protocol. Time-motion traits and physiological, perceptual, and neuromuscular responses were investigated in 24 male soccer players across 14 matches and 6 GPBT training sessions, for a total of 420 samples. The GPBT had a greater influence on time-motion traits and perceptual responses than the NYL and UYL matches (all p< 0...
December 8, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28002178/effect-of-different-onset-thresholds-on-isometric-mid-thigh-pull-force-time-variables
#14
Thomas Dos'Santos, Paul A Jones, Paul Comfort, Christopher Thomas
Various thresholds have been used to identify the onset of contraction during isometric mid-thigh pull (IMTP) however, no agreed onset threshold exists for this assessment. The purpose of this study was to compare relative body weight (BW) and arbitrary onset thresholds to a criterion onset threshold 5 SD of BW for IMTP force-time variables; force at each threshold, peak force (PF), time-specific force values (100, 150 and 200 ms) and rate of force development (RFD) during 0-100 ms, 0-150 ms, 0-200 ms. Academy rugby league players (n = 9, age: 18...
December 8, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28002177/selected-physiological-perceptual-and-physical-performance-changes-during-two-bouts-of-prolonged-high-intensity-intermittent-running-separated-by-72-hours
#15
Nicholas Dobbin, Kevin Lamb, Craig Twist
This study investigated the effects of performing a second 90-minute intermittent running protocol 72 hours after an initial trial on selected physiological, perceptual and sprint running measures. Eight sub-elite soccer players provided measures of isokinetic muscle function, counter-movement jump (CMJ), 10 m sprinting, and muscle soreness before, and at 0, 24, 48 and 72 h after a 90-minute intermittent high intensity running bout (IHIR 1). A second 90-minute intermittent high intensity running bout (IHIR 2) was performed 72 h after the first...
December 8, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28002176/effects-of-synergist-vs-non-synergist-split-resistance-training-routines-on-acute-neuromuscular-performance-in-resistance-trained-men
#16
Rafael P M Castanheira, João B Ferreira-Junior, Rodrigo Celes, Valdinar A Rocha-Junior, Eduardo L Cadore, Mikel Izquierdo, Martim Bottaro
The aim of this study was to evaluate the effects of synergist vs. non-synergist split resistance training routines on the acute neuromuscular performance of the elbow flexors in resistance trained men. Fifteen resistance trained men (age: 23.2 ± 4.0 years, height: 173.0 ± 0.08 cm, and body mass: 78.38 ± 9.31 kg) randomly performed three training routines separated by an interval of 7 days: 1) pull-pull exercises (synergist routine, SN), which included 6 sets of 10 maximum repetitions (RM) of a seated row exercise followed by 4 sets of 10RM of the preacher biceps curl exercise; 2) push-pull exercises (non-synergist routine, NS), which included 6 sets of 10RM of the bench press exercise followed by 4 sets of 10RM of the preacher biceps curl exercise; and 3) Control, which included 4 sets of 10RM of the preacher biceps curl exercise...
December 8, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27984439/skeletal-muscle-fatigability-and-myosin-heavy-chain-fiber-type-in-resistance-trained-men
#17
James R Bagley, Kathryn A McLeland, Jose A Arevalo, Lee E Brown, Jared W Coburn, Andrew J Galpin
Forty years ago, Thorstensson and Karlsson (1976) described the link between muscle fatigability and fiber type, finding that more fast-twitch fibers were associated with a quicker onset of quadriceps fatigue. This provided the foundation for the Classic Thorstensson Test (CT) of fatigability and subsequent noninvasive fiber type prediction equation. This equation was developed with data from recreationally active (REC) men, but has been implemented in participants with heterogeneous physical activity/exercise backgrounds...
December 7, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27984438/assessing-the-effectiveness-of-the-functional-movement-screen-fms%C3%A2-in-predicting-non-contact-injury-rates-in-soccer-players
#18
Paul D Smith, Michael Hanlon
This study assessed if the Functional Movement Screen (FMS™) can accurately predict non-contact injury in adult soccer players when normalizing non-contact injury occurrence against match exposure levels. Senior male players (n=89) from five League of Ireland semi-professional clubs participated in the study (mean age=23.2 ± 4.4 years; mean height=179.5 ± 6.6 cm; mean body mass=77.5 ± 7.8 kg). Participants performed the FMS™ during preseason and their injury occurrence rates and match minutes were tracked throughout one season...
December 7, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27984500/seasonal-changes-in-soccer-players-body-composition-and-dietary-intake-practices
#19
Brooke L Devlin, Michael Kingsley, Michael D Leveritt, Regina Belski
The aims of this study were two-fold: to determine seasonal changes in dietary intake and body composition in elite soccer players and to evaluate the influence of self-determined individual body composition goals on dietary intake and body composition. This longitudinal, observational study assessed body composition (total mass, fat-free soft tissue mass and fat mass) using dual-energy x-ray absorptiometry and dietary intake (energy and macronutrients) via multiple pass 24-hour recalls, at four time points over a competitive season in elite soccer players from one professional club in the Australian A-League competition...
November 29, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27984499/effects-of-pre-exhaustion-on-the-patterns-of-muscular-activity-in-the-flat-bench-press
#20
Gołaś Artur, Maszczyk Adam, Pietraszewski Przemyslaw, Petr Stastny, Tufano James, Zając Adam
Pre-exhaustion (PE) has been applied in resistance training to manipulate the order of performing two resistance exercises, a single joint exercise to momentary exhaustion, followed by a multi-joint movement which includes the same muscle group. This method ensures greater recruitment of muscles or muscle groups in the multi-joint exercise to further increase muscle strength and overcome strength plateaus. The purpose of the present study was to investigate muscle activity by electromyography during high-intensity (95% of 1 repetition maximum) bench press (BP), before and after PE of the pectoralis major (PM), anterior deltoid (AD) and triceps brachii (TB) muscles in order to determine the effects of PE of the prime movers...
November 29, 2016: Journal of Strength and Conditioning Research
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