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https://www.readbyqxmd.com/read/28417093/instability-resistance-training-for-health-and-performance
#1
REVIEW
Erika Zemková
Recently, resistance exercises performed on an unstable surface have become part of athletic training and rehabilitation. Accordingly, their role in performance and health-oriented strength training has increasingly emerged as a matter of interest to researchers and conditioning specialists. A more pronounced activation of stabilizing muscles is assumed to be the main feature of instability resistance exercises. This assumption has been proven by EMG studies, which have highlighted significantly greater electromyographic activity of trunk-stabilizing muscles during exercises under unstable as compared to stable conditions...
April 2017: Journal of Traditional and Complementary Medicine
https://www.readbyqxmd.com/read/28399015/the-effects-of-ketogenic-dieting-on-body-composition-strength-power-and-hormonal-profiles-in-resistance-training-males
#2
Jacob M Wilson, Ryan P Lowery, Michael D Roberts, Matthew H Sharp, Jordan M Joy, Kevin A Shields, Jeremy Partl, Jeff S Volek, Dominic D'Agostino
This study investigated the impact of an isocaloric and isonitrogenous ketogenic diet (KD) versus a traditional western diet (WD) on changes in body composition, performance, blood lipids, and hormonal profiles in resistance-trained athletes. METHODS: Twenty-five college aged men were divided into a KD or traditional WD from weeks 1-10, with a reintroduction of carbohydrates from weeks 10-11, while participating in a resistance-training program. Body composition, strength, power, and blood lipid profiles were determined at week 0, 10 and 11...
April 7, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28394833/optimizing-half-squat-post-activation-potential-load-in-squat-jump-training-for-eliciting-relative-maximal-power-in-ski-jumpers
#3
A Gołaś, M Wilk, P Statsny, A Maszczyk, K Pajerska, A Zajac
Training load manipulation in a single workout session can increase or decrease training effectiveness in terms of athlete's strength or power gains. In ski jumping the complex training that elicits maximal power gains may take advantage of the post activation potentiation mechanism (PAP). The aim of research was to evaluate the changes in rate of force development (RFD), rate of power development (RPD) and jump height during a complex training session consisted of the barbell half squat (Sq) as an conditioning exercise with loads ranged between 60-100% of 1 repetition maximum (1RM), followed by a body weight squat jump (SqJ) as a performance task...
April 7, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28347219/the-national-football-league-225-bench-press-test-and-the-size-weight-illusion
#4
Paul E Luebbers, Gavin Buckingham, Michael S Butler
The purpose of this study was to test reports that size and arrangement manipulations of weight plates (i.e., inducing a size-weight illusion [SWI]) would have an effect on athletic weightlifting performance. The participants were 72 experienced, weight-trained collegiate American football players. Across 3 weeks, each athlete performed three different repetitions-to-fatigue bench press tests (NFL-225, SWI-225, and SWI-215). A multiple regression revealed a positive association between participants' strength relative to the test load and repetitions for NFL-225 and SWI-215, but no association with SWI-225...
January 1, 2017: Perceptual and Motor Skills
https://www.readbyqxmd.com/read/28344734/aerobic-capacity-is-related-to-repeated-sprint-ability-with-sprint-distances-less-than-40-meters
#5
Gabriel J Sanders, Zachary Turner, Brian Boos, Corey A Peacock, Willard Peveler, Alar Lipping
Research is inconclusive regarding the association between aerobic fitness (objectively measured VO2max) and repeated sprint performance when the sprints are less than 40 meters. Soccer athletes must be able to repeat sprints without significant decreases in speed and strength and conditioning coaches need to better understand if aerobic fitness is related to repeated sprint ability (RSA). Twenty (10 male, 10 female) Division I soccer athletes first completed a graded maximal treadmill test to measure VO2max...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28338355/the-potential-for-a-targeted-strength-training-programme-to-decrease-asymmetry-and-increase-performance-a-proof-of-concept-in-sprinting
#6
Scott R Brown, Erin R Feldman, Matt R Cross, Eric R Helms, Bruno Marrier, Pierre Samozino, Jean-Benoît Morin
The global application of horizontal force (FH) via hip extension is related to improvements in sprint performance (e.g. maximal velocity [vmax] and power [Pmax]). Little is known regarding the contribution of individual-leg FH and how a difference between the legs (asymmetry) might subsequently affect sprint performance. We assessed a single male athlete for pre-post outcomes of a targeted hip extension training programme on FH asymmetry and sprint performance metrics. An instrumented non-motorised treadmill was used to obtain individual-leg and global sprint kinetics and determine the athlete's strong and weak leg, with regards to the ability to produce FH while sprinting...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28328717/perceived-sleep-quality-mood-states-and-their-relationship-with-performance-among-brazilian-elite-athletes-during-a-competitive-period
#7
Ricardo Brandt, Guilherme G Bevilacqua, Alexandro Andrade
Brandt, R, Bevilacqua, GG, and Andrade, A. Perceived sleep quality, mood states, and their relationship with performance among Brazilian elite athletes during a competitive period. J Strength Cond Res 31(4): 1033-1039, 2017-We described the perceived sleep quality and mood states of elite athletes during a competitive period, and clarified their relationship to athletes' sport performance. Participants were 576 Brazilian elite athletes (404 men and 172 women) of individual and team sports. Mood states were evaluated using the Brunel Mood Scale, whereas perceived sleep quality was evaluated using a single question ("How would you evaluate the quality of your sleep in the last few days?")...
April 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28316257/acute-kinematic-and-kinetic-adaptations-to-wearable-resistance-during-vertical-jumping
#8
Paul Macadam, Kim D Simperingham, John B Cronin, Grace Couture, Chloe Evison
One variation of vertical jump (VJ) training is resisted or weighted jump training, where wearable resistance (WR) enables jumping to be overloaded in a movement specific manner. A two-way analysis of variance with Bonferroni post hoc contrasts was used to determine the acute changes in VJ performance with differing load magnitudes and load placements. Kinematic and kinetic data were quantified using a force plate and contact mat. Twenty sport active subjects (age: 27.8 ± 3.8 years; body mass (BM): 70...
March 19, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28294692/lower-extremity-isokinetic-strength-ratios-of-elite-springboard-and-platform-diving-athletes
#9
Amilton Vieira, Savio Alex, André Martorelli, Lee E Brown, Ricardo Moreira, Martim Bottaro
OBJECTIVES: The purpose of the present study was to examine knee extensor and flexor muscle strength ratios of an elite group of diving athletes. METHODS: Sixteen divers (10 females and 6 males) from the Brazil national team were assessed for lower-body strength. They had participated in international competitions such as the 2016 Olympic Games and 2015 Pan American Games. The dynamic concentric torque of their knee flexor and extensor muscles were evaluated using a Biodex isokinetic dynamometer...
May 2017: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/28291764/delayed-effects-of-a-low-volume-power-type-resistance-exercise-session-on-explosive-performance
#10
Athanasios Tsoukos, Panagiotis Veligekas, Lee E Brown, Gerasimos Terzis, Gregory C Bogdanis
This study examined the delayed effects of a power type training session on explosive performance. Seventeen well-trained male power and team sport athletes (age: 22.7±5.5 y, height: 181±8 cm, body mass: 80.7±8.6 kg, body fat: 9.2±1.7 %, 1-RM half-squat: 163±29 kg) performed four sessions (2 experimental and 2 control) one week apart in a randomized and counterbalanced order. Explosive performance was assessed before, 24 and 48 h following a low-volume, power-type training session (5 x 4 jump squats at 40% 1RM with 3 min rest), as well as before and after 24 and 48 h of rest (control)...
January 24, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28282758/the-effects-of-barbell-load-on-countermovement-vertical-jump-power-and-net-impulse
#11
Peter D Mundy, Neal A Smith, Mike A Lauder, Jason P Lake
The aim of this study was to examine the effects of barbell load on countermovement vertical jump (CMJ) power and net impulse within a theoretically valid framework, cognisant of the underpinning force, temporal, and spatial components. A total of 24 resistance-trained rugby union athletes (average ± SD: age: 23.1 ± 3.4 years; height: 1.83 ± 0.05 m; body mass (BM): 91.3 ± 10.5 kg) performed maximal CMJ under 5 experimental conditions in a randomised, counterbalanced order: unloaded, and with additional loads of 25%, 50%, 75%, and 100% of BM...
September 26, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28277424/comparing-performance-during-morning-vs-afternoon-training-sessions-in-intercollegiate-basketball-players
#12
Aaron D Heishman, Michael A Curtis, Ethan Saliba, Robert J Hornett, Steven K Malin, Arthur L Weltman
Time of day is a key factor that influences the optimization of athletic performance. Intercollegiate coaches oftentimes hold early morning strength training sessions for a variety of factors including convenience. However, few studies have specifically investigated the effect of early morning vs. late afternoon strength training on performance indices of fatigue. This is athletically important because circadian/ultradian rhythms and alterations in sleep patterns can impact training ability. Therefore, the purpose of the present study was to examine the effects of morning vs...
March 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28255565/defining-the-long-toss-a-professional-baseball-epidemiological-study
#13
Austin V Stone, Sandeep Mannava, Anita Patel, Alejandro Marquez-Lara, Michael T Freehill
BACKGROUND: Despite widespread use of long-toss throwing in baseball as a component of arm conditioning, interval throwing programs, and rehabilitation, long-toss distance and throwing mechanics remain controversial. PURPOSE: To ascertain the perceived definition of long-toss throwing through a survey of professional pitchers, pitching coaches (PCs), and certified athletic trainers (ATCs) associated with Major League Baseball. STUDY DESIGN: Descriptive epidemiology study...
February 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28229575/effects-of-a-low-volume-plyometric-training-in-anaerobic-performance-of-adolescent-athletes
#14
Ari R Assunção, Martim Bottaro, Euler A Cardoso, Daiane P Dantas da Silva, Marcelo Ferraz, Carlos A Vieira, Paulo Gentil
BACKGROUND: Parameters related to the anaerobic capacity and power may be important for the performance of many sports whose skills are related to high-intensity and short- duration efforts. Although plyometric training (PT) has been widely used in the regular strength and conditioning programs of young athletes, its effects on anaerobic performance are still controversial. Therefore, the purpose of the present study was to evaluate the effects of PT in anaerobic performance in young athletes...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28195977/fat-grip-resistance-training-improves-driving-performance-in-division-i-male-golfers
#15
Patrick M Cummings, Hunter S Waldman, Ben M Krings, JohnEric W Smith, Matthew J McAllister
Fat Grip (FG) training is implemented into strength and conditioning programs with the overall goal of increasing grip strength. Previous research assessing the effect of training with increased grip diameters compared to standard Olympic bar diameters has mainly been in acute settings. Therefore, the purpose of this study was to examine to effects FG training compared to normal diameter grip (CON) training during an eight week periodized resistance training (RT) program in Division I male golfers. Subjects (n = 10) were randomly assigned into two groups: the FG group (n = 5, scoring average: 75...
February 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28194734/physical-and-physiological-profiles-of-brazilian-jiu-jitsu-athletes-a-systematic-review
#16
REVIEW
Leonardo Vidal Andreato, Francisco Javier Díaz Lara, Alexandro Andrade, Braulio Henrique Magnani Branco
BACKGROUND: Brazilian jiu-jitsu is a grappling combat sport that has intermittency as its core element; in other words, actions of high, moderate and low intensity are interspersed during matches, requiring a high level of conditioning to support optimal levels of performance for the total match time. The athletes perform from four to six matches during a day of competition, and this number may increase if the open-class competition, which is held parallel to the competition by weight class, is considered...
December 2017: Sports Medicine—Open
https://www.readbyqxmd.com/read/28151781/acute-effects-of-eccentric-overload-on-concentric-front-squat-performance
#17
Cameron N Munger, David C Archer, Whitney D Leyva, Megan A Wong, Jared W Coburn, Pablo B Costa, Lee E Brown
Munger, CN, Archer, DC, Leyva, WD, Wong, MA, Coburn, JW, Costa, PB, and Brown, LE. Acute effects of eccentric overload on concentric front squat performance. J Strength Cond Res 31(5): 1192-1197, 2017-Eccentric overload is used to enhance performance. The purpose of this study was to investigate the acute effects of eccentric overload on concentric front squat performance. Twenty resistance-trained men (age = 23.80 ± 1.82 years, height = 176.95 ± 5.21 cm, mass = 83.49 ± 10.43 kg, 1 repetition maximum [1RM] front squat = 131...
May 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28149428/analysis-of-tests-evaluating-sport-climbers-strength-and-isometric-endurance
#18
Mariusz Ozimek, Robert Staszkiewicz, Robert Rokowski, Arkadiusz Stanula
The present study was designed to determine which types of specific tests provide an effective evaluation of strength and endurance in highly trained competitive sport climbers. The research process consisted of three basic components: the measurement of selected somatic characteristics of the climbers, the assessment of their physical conditioning, and a search for correlations between the anthropometric and "conditioning" variables on the one hand, and climber's performance on the other. The sample of subjects consisted of 14 experienced volunteer climbers capable of handling 7a- 8a+/b on-sight rock climbing grades...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28149427/effects-of-plyometric-training-on-physical-fitness-in-team-sport-athletes-a-systematic-review
#19
Maamer Slimani, Karim Chamari, Bianca Miarka, Fabricio B Del Vecchio, Foued Chéour
Plyometric training (PT) is a very popular form of physical conditioning of healthy individuals that has been extensively studied over the last decades. In this article, we critically review the available literature related to PT and its effects on physical fitness in team sport athletes. We also considered studies that combined PT with other popular training modalities (e.g. strength/sprint training). Generally, short-term PT (i.e. 2-3 sessions a week for 4-16 weeks) improves jump height, sprint and agility performances in team sport players...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28149397/optimizing-post-activation-potentiation-for-explosive-activities-in-competitive-sports
#20
Artur Gołaś, Adam Maszczyk, Adam Zajac, Kazimierz Mikołajec, Petr Stastny
Post activation potentiation (PAP) has shown improved performance during movements requiring large muscular power output following contractions under near maximal load conditions. PAP can be described as an acute enhancement of performance or an enhancement of factors determining an explosive sports activity following a preload stimulus. In practice, PAP has been achieved by complex training, which involves a combination of a heavy loaded exercise followed by a biomechanically similar explosive activity, best if specific for a particular sport discipline...
September 1, 2016: Journal of Human Kinetics
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