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https://www.readbyqxmd.com/read/29466274/dissociated-time-course-of-recovery-between-strength-and-power-after-isoinertial-resistance-loading-in-rugby-union-players
#1
Rodney A Kennedy, David Drake
Kennedy, RA and Drake, D. Dissociated time course of recovery between strength and power after isoinertial resistance loading in rugby union players. J Strength Cond Res 32(3): 748-755, 2018-There is a substantial amount of research on the responses to isometric and eccentric loading. However, only a paucity of literature exists on the responses to isoinertial loading, especially in trained athletic populations using realistic loading protocols. The purpose of this study was to examine the acute neuromuscular response to a bout of isoinertial resistance loading in elite rugby players...
March 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29464367/inalambric-biofeedback-devices-to-analyze-strength-manifestation-in-military-population
#2
Rosa Delgado-Moreno, José Juan Robles-Pérez, Susana Aznar, Vicente Javier Clemente-Suarez
The study of the effect of stress on both combatants physiological and anatomical systems have been poor studied in the specific literature. The present research aimed to study the effect of combat stress in strength manifestations of leg flexor-extensor muscles and the anaerobic metabolism of soldiers. Before and after asymmetrical combat simulation were analyzed parameters of blood lactate concentration, explosive leg strength manifestation and contractile capacity of leg muscle in 186 professional soldiers...
February 20, 2018: Journal of Medical Systems
https://www.readbyqxmd.com/read/29464353/cardio-pulmonary-responses-to-incremental-eccentric-and-concentric-cycling-tests-to-task-failure
#3
Marcin Lipski, Chris R Abbiss, Kazunori Nosaka
PURPOSE: This study compared cardio-pulmonary responses between incremental concentric and eccentric cycling tests, and examined factors affecting the maximal eccentric cycling capacity. METHODS: On separate days, nine men and two women (32.6 ± 9.4 years) performed an upright seated concentric (CON) and an eccentric (ECC) cycling test, which started at 75 W and increased 25 W min-1 until task failure. Gas exchange, heart rate (HR) and power output were continuously recorded during the tests...
February 20, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29463359/prophylactic-ankle-braces-and-the-kinematics-and-kinetics-of-half-squat-parachute-landing
#4
Di Wu, Chao Zheng, Ji Wu, Tan Hu, Rongrong Huang, Lizhen Wang, Yubo Fan
INTRODUCTION: The objective of the study was to investigate the effects of dropping heights and prophylactic ankle braces on ankle joint biomechanics during half-squat parachute landing from two different heights. METHODS: There were 30 male elite paratroopers with formal parachute landing training and more than 2 yr of parachute jumping experience who were recruited for this study. The subjects tested three different ankle brace conditions (no-brace, elastic brace, semirigid brace)...
February 1, 2018: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/29461422/eight-weeks-of-strength-and-power-training-improves-club-head-speed-in-collegiate-golfers
#5
Dustin J Oranchuk, Jason M Mannerberg, Tracey L Robinson, Megan C Nelson
Club head speed (CHS) is a major determinant of drive distance, a key component of golf performance. The purpose of this study was to determine the indirect effects of an eight-week strength and power program on CHS. Twelve (6 male, 6 female) NCAA Division II golfers (20.3±1.5 years) randomly assigned to an intervention or control group, underwent either a periodized strength and power program consisting of high-load barbell movements or a bodyweight and rotational movement focused resistance training program...
February 14, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29461420/the-effect-of-ibuprofen-on-muscle-hematological-and-renal-function-hydric-balance-pain-and-performance-during-intense-long-distance-running
#6
Raphael Fabricio de Souza, Dihogo Gama de Matos, Alexandre Reis Pires Ferreira, Philip Chilibeck, Natalie de Almeida Barros, Alan Santos de Oliveira, Luana Mendonça Cercato, Danielle Soares da Silva, Felipe José Aidar
The aim of this study was to investigate the effect of prophylactic use of nonsteroidal anti-inflammatory drugs (NSAID, i.e. Ibuprofen) on physical performance, vertical jump, muscle biomarkers, liver, kidney, acute pain and hydration status of participants in the 42 km Trail Running Challenge, a long-distance race integrated over mountain routes. The sample consisted of 20 males randomly divided into two groups: a control group (CG) and an experimental group (EG) with 12 completing the race (41.1±8.8 y; 75...
February 14, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29461412/the-effect-of-augmented-feedback-type-and-frequency-on-velocity-based-training-induced-adaptation-and-retention
#7
Akinori Nagata, Kenji Doma, Daichi Yamashita, Hiroshi Hasegawa, Shuji Mori
The purpose of this study was to compare the benefits of 4-weeks of velocity-based training (VBT) using different augmented feedback (AugFb) types and the frequency of AugFb, and whether adaptations are retained 10 days post-training. Thirty-seven collegiate male rugby players were divided into groups that received immediate-feedback (ImFb; n=9), visual-feedback (ViFb; n=10), average-feedback (AvgFb; n=10) and no-feedback (NoFb; n=8) during each VBT session consisting of 3 sets of 5 repetitions of loaded jump squats...
February 14, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29443822/power-to-strength-ratio-influences-performance-enhancement-with-contrast-training
#8
Knut Thomas Schneiker, Jackson James Fyfe, Francois Billaut, David John Bishop
PURPOSE: The effectiveness of contrast training (CST) for improving explosive exercise performance is modulated by various individual characteristics; however, further work is required to define these factors. METHODS: Sub-elite male Australian Football players [n = 22; age, 19 ± 2 y; body mass, 80.4 ± 9.4 kg; one-repetition maximum (1-RM) half squat, 172 ± 18 kg; mean ± SD] completed two experimental trials involving two sets of squat jumps (6 repetitions at 30% 1-RM) performed either alone (CTL condition) or after half squats (6 repetitions at 85% 1-RM; CST condition)...
February 13, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29420390/specific-adaptations-in-performance-and-muscle-architecture-after-weighted-jump-squat-vs-body-mass-squat-jump-training-in-recreational-soccer-players
#9
Giuseppe Coratella, Marco Beato, Chiara Milanese, Stefano Longo, Eloisa Limonta, Susanna Rampichini, Emiliano Cè, Angela Valentina Bisconti, F Schena, F Esposito
The aim of the present study was to compare the effects of weighted jump squat (WJST) vs body mass squat jump training (BMSJT) on quadriceps muscle architecture, lower-limb lean-mass (LM) and muscle strength, performance in change of direction (COD), sprint and jump in recreational soccer-players. Forty-eight healthy soccer-players participated in an off-season randomized controlled-trial. Before and after an eight-week training intervention, vastus lateralis pennation angle, fascicle length, muscle thickness, LM, squat 1-RM, quadriceps and hamstrings isokinetic peak-torque, agility T-test, 10 and 30m sprint and squat-jump (SJ) were measured...
February 6, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29401203/the-effect-of-accommodating-resistance-on-the-post-activation-potentiation-response-in-rugby-league-players
#10
David J Scott, Massimiliano Ditroilo, Phil Marshall
This study examined the post-activation potentiation (PAP) response of two conditioning activities (CA), the hexbar deadlift (HBD) and back squat (BS), combined with accommodating resistance; this adds a percentage of the total resistance during the exercise. Twenty amateur rugby league players performed two experimental trials and a control trial without a CA. Participants performed a countermovement jump (CMJ) before and 30, 90, and 180 seconds after one set of three repetitions of each CA at 70% 1 repetition maximum (RM), with up to an additional 23% 1RM from accommodating resistance...
February 1, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29401202/effects-of-different-plyometric-training-frequency-on-measures-of-athletic-performance-in-prepuberal-male-soccer-players
#11
Raja Bouguezzi, Helmi Chaabene, Yassine Negra, Rodrigo Ramirez-Campillo, Zied Jlalia, Bessem Mkaouer, Younés Hachana
This study aimed to compare the effects of one vs. two sessions of equal-weekly volume plyometric training (PT) across 8 weeks on measures of athletic performance (i.e., sprint-time, change of direction [CoD], jumping ability, and muscle strength) in prepuberal male soccer players. Thirty participants were randomly assigned either to one session PT group (1SPT [n=15]) or two sessions PT group (2SPT [n=15]). Plyometric training was integrated into their regular soccer training routine. Pre- and post-training tests for the assessment of sprint-time (e...
February 1, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29389692/optimal-reactive-strength-index-is-it-an-accurate-variable-to-optimize-plyometric-training-effects-on-measures-of-physical-fitness-in-young-soccer-players
#12
Rodrigo Ramirez-Campillo, Cristian Alvarez, Felipe García-Pinillos, Javier Sanchez-Sanchez, Javier Yanci, Daniel Castillo, Irineu Loturco, Helmi Chaabene, Jason Moran, Mikel Izquierdo
This study aimed to compare the effects of drop-jump training using a fixed drop-box height (i.e., 30-cm [FIXED]) versus an optimal drop-box height (i.e, 10-cm to 40-cm: generating an optimal [OPT] reactive strength index [RSI]) in youth soccer players' physical fitness. Athletes were randomly allocated to a control-group (CG: n=24; age=13.7 years), a fixed drop-box height group (FIXED, n=25; age=13.9 years) or an optimal drop-box height group (OPT, n=24; age=13.1 years). Before and after 7 weeks of training, tests for the assessment of jumping (countermovement jump [CMJ], five multiple bounds [MB]), speed (20-m sprint time), change of direction (Illinois change of direction test [CODT]), strength (RSI and 5 maximal squat repetition test [5RM]), endurance (2...
January 30, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29385007/alcohol-after-resistance-exercise-does-not-affect-muscle-power-recovery
#13
Danielle E Levitt, Nosakhare O Idemudia, Carianne M Cregar, Anthony A Duplanty, David W Hill, Jakob L Vingren
The purpose of this study was to investigate the effect of alcohol consumed after heavy eccentric resistance exercise on measures of muscle power. After familiarization and an initial eccentric exercise bout to control for the "repeated-bout effect," ten recreationally resistance-trained men completed two identical heavy eccentric squat bouts (4 sets of 10 repetitions at 110% of concentric 1-repetition maximum) one week apart. Each exercise bout was followed by ingestion of a beverage containing either alcohol (1...
January 29, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29377715/fitness-level-modulates-intraocular-pressure-responses-to-strength-exercises
#14
Jesús Vera, Raimundo Jiménez, Beatríz Redondo, David Cárdenas, Amador García-Ramos
Purpose/Aim: The execution of strength exercises has demonstrated to increase the intraocular pressure (IOP) levels, and it may have a negative impact on the ocular health. We aimed to explore the influence of fitness level on the acute IOP response to strength exercises performed under different loading conditions, as well as to test whether the IOP responses differ between the bench press and jump squat when performed against the same relative loads. MATERIALS AND METHODS: Forty military personnel males were divided in two subgroups (20 high-fit and 20 low-fit) based on their relative to body mass one-repetition maximum (1-RM)...
January 29, 2018: Current Eye Research
https://www.readbyqxmd.com/read/29373431/the-importance-of-strength-and-power-on-key-performance-indicators-in-elite-youth-soccer
#15
Christopher E Wing, Anthony N Turner, Chris J Bishop
The purpose of this investigation was to examine the importance of strength and power in relation to key performance indicators (KPI's) within competitive soccer match play. This was achieved through using an experimental approach where fifteen subjects were recruited from a professional soccer club's scholarship squad during the 2013/14 season. Following anthropometric measures, power and strength were assessed across a range of tests which included the squat jump (SJ), countermovement jump (CMJ), 20 metre (m) sprint and arrowhead change of direction test...
January 24, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29373428/a-four-week-unstructured-break-improved-athletic-performance-in-collegiate-rugby-players
#16
C D Jensen, D Gleason, J M VanNess
This study analyzed the changes in athletic performance and anthropometric characteristics in collegiate male club rugby athletes (n=14) following a four-week winter break. All measurements were collected prior to and after the break. Body composition was assessed by body mass index and hydrostatic weighing. Performance measurements were: VO2 max, vertical jump, 10-yard sprint, squat max, and bench press max. Prior to testing, each subject was acclimated to the protocols to reduce learning effects. During the four-week break, no workouts were provided for the athletes; it was unsupervised and unstructured...
January 24, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29370541/effects-of-lunar-phases-on-short-term-explosive-physical-performance-among-young-trained-athletes
#17
Narimen Yousfi, Mohamed Arbi Mejri, Mehdi Rouissi, Amri Hammami, Montassar Tabben, Anis Chaouachi, Monoem Haddad, Karim Chamari
Beliefs that lunar phases affect human physiology started in ancient times. Research has recently revealed that a physical fitness index increased in sedentary students at the new moon (NM) and full moon (FM) compared to other moon phases. However, the effect of lunar cycle (moon illumination and gravitational pull) on physical performance in athletes was not examined. Therefore, this study aimed to evaluate whether short-term explosive performance can be influenced by the different phases of the lunar cycle...
January 25, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29351162/potentiation-effects-of-the-french-contrast-method-on-the-vertical-jumping-ability
#18
Joseba Andoni Hernández-Preciado, Eneko Baz, Carlos Balsalobre-Fernández, David Marchante, Jordan Santos-Concejero
This study examined the acute effects of the potentiation protocol known as French Contrast Method on the vertical jumping ability measured by a countermovement jump (CMJ). 31 athletes participated in the study (intervention group n=17 and control group n=14). The CMJ height was measured using the IOS application MyJump App 2.0 pre- and post- the French Contrast protocol, which consisted of 3 sets of isometric partial squats, drop jumps, dynamic half-squats and hurdle jumps. The CMJ height improved from its baseline values by 5...
January 17, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29351161/effects-of-contrast-strength-vs-plyometric-training-on-lower-limb-explosive-performance-ability-to-change-direction-and-neuromuscular-adaptation-in-soccer-players
#19
Mehrez Hammami, Nawel Gaamouri, Roy J Shephard, Mohamed Souhaiel Chelly
The aim was to compare the effects of two differing 8-week in-season strength training programs (contrast strength training [CST] vs. plyometric training [PT]) on selected performance tests (5 and 40m sprints, S 4 X 5 m change of direction test, squat (SJ) and countermovement (CMJ) jumps , leg peak power on a cycle ergometer force-velocity test, 1-repetition maximal (1-RM) half squat, and electromyographic [EMG] activity of the vastus lateralis, vastus medialis and rectus femoris muscles during vertical jump tests)...
January 17, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29340002/performance-changes-of-elite-paralympic-judo-athletes-during-a-paralympic-games-cycle-a-case-study-with-the-brazilian-national-team
#20
Irineu Loturco, Lucas A Pereira, Ciro Winckler, Jaime R Bragança, Roger A da Fonseca, Ronaldo Kobal, Cesar C Cal Abad, Katia Kitamura, Fabio Y Nakamura, Emerson Franchini
The aim of this study was to describe the variations in power performance of elite Paralympic judo athletes across three consecutive training cycles of preparation for the ParaPan American Games, the World Championship and the Paralympic Games. Eleven Paralympic judokas from the Brazilian National team participated in this study. They were repeatedly assessed using squat and countermovement jumps, mean propulsive power (MPP) in the jump-squat (JS), the bench press and prone bench pull at several moments of the preparation...
December 2017: Journal of Human Kinetics
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