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Renan Felipe Hartmann Nunes, Rob Duffield, Fábio Yuzo Nakamura, Ewertton de Souza Bezerra, Raphael Luiz Sakugawa, Irineu Loturco, Franciane Bobinski, Daniel Fernandes Martins, Luiz Guilherme Antonacci Guglielmo
We investigated the effect of post-match cold-water immersion (CWI) on markers of muscle damage, neuromuscular fatigue and perceptual responses within 72 h after a Rugby match. Twenty-two professional male Rugby players were randomized into CWI (10°C/10min; n=11) or Control (CON:30min seated; n=11) groups. Activity profile from Global Positioning Satellite systems and post-match rating of perceived exertion were measured to determined match load. Biochemical (tumor necrosis factor alpha [TNF-α], interleukin-6 [IL-6]), neuromuscular performance (squat and countermovement jump [SJ; CMJ], peak power output [PPO], rate of force development [RFD], stiffness, 10- and 30-m sprint time and perceptual markers (soreness, perceived recovery) were obtained at pre, post, 30 min, 24, 48 and 72 h post-match...
October 15, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
Matthew Ellis, Mark Noon, Tony Myers, Neil Clarke
CONTEXT: Large doses of ~6 mg·kg-1 body mass have improved performance during intermittent running, jumping, and agility protocols. However, there are sparse data on low doses of caffeine, especially in elite adolescent soccer players. METHOD: Fifteen elite youth soccer players (177.3±4.8 cm, 66.9±7.9 kg and 16±1 y) participated in the study, consuming 1, 2, or 3 mg·kg-1 caffeine in a gelatin capsule or a 2-mg·kg-1 placebo in a single-blind, randomized, crossover study design...
October 9, 2018: International Journal of Sports Physiology and Performance
Chris Bishop, Paul Read, Jason Lake, Irineu Loturco, Anthony Turner
Bishop, C, Read, P, Lake, J, Loturco, I, and Turner, A. A novel approach for athlete profiling: The unilateral dynamic strength index. J Strength Cond Res XX(X): 000-000, 2018-The Dynamic Strength Index (DSI) provides a ratio of the peak force an athlete can produce in both isometric and ballistic tasks. Although the DSI measured during bilateral tests has been examined, unilateral DSI scores have not been reported to date and thus was the aim of the present study. Twenty-eight recreational sport athletes performed 3 trials of a unilateral isometric squat and countermovement jump (CMJ) to measure peak force in each task across 2 separate test sessions...
October 5, 2018: Journal of Strength and Conditioning Research
Antonio Jesus Morales-Artacho, Amador García Ramos, Alejandro Pérez-Castilla, Paulino Padial, Javier Argüelles-Cienfuegos, Blanca de la Fuente, Belen Feriche
We aimed to explore relationships between the force-velocity (FV) profile and the isometric muscle torque performance during a knee extension task. The FV profile (force-intercept [F0 ], velocity-intercept [V0 ], maximum power [Pmax ], and FV slope) during the countermovement jump (CMJ) exercise and isometric maximum voluntary torque (MVIC) and explosive voluntary torque production were assessed in 43 participants. Electromyography (EMG) was recorded during the isometric assessments and resting muscle architecture measurements were also performed (quadriceps thickness, vastus lateralis pennation angle and fascicle length)...
October 5, 2018: International Journal of Sports Medicine
Michal Spieszny, Mateusz Zubik
A high level of muscle power is necessary for the effective use of technique during handball competitions. The presented research concentrated on comparing the effectiveness of two training modes directed towards the development of muscle power - plyometric and traditional strength training. Furthermore, we evaluated whether resistance training performed twice a week was sufficient to guarantee an increase in muscle power of handball players. We also investigated whether strength training designed according to the "waving" model (one training session per week oriented towards the development of maximal strength and one towards the development of power) was sufficient to increase muscle power in handball players...
August 31, 2018: Journal of Human Kinetics
Ljubomir Pavlović, Nenad Stojiljković, Nikola Aksović, Emilija Stojanović, Zoran Valdevit, Aaron T Scanlan, Zoran Milanović
The purposes of this study were to determine: 1) morning-to-evening differences in physical performance with and without a ball; and 2) associations between sleep outcomes (duration and quality) and physical performance in handball players. Sixteen elite, male handball players (25.4 ± 5.8 yr, 94.0 ± 7.4 kg, 193.5 ± 7.5 cm) completed physical performance tests without a ball (a zig-zag test assessing closed-skill agility, linear sprints, and countermovement (CMJ) and squat jumps) and with a ball (a zig-zag test and linear sprints) in the morning and evening...
August 31, 2018: Journal of Human Kinetics
Michał Górski, Michał Starczewski, Anna Pastuszak, Joanna Mazur-Różycka, Jan Gajewski, Krzysztof Buśko
The aim of the study was to investigate changes of strength and power of the lower extremities in adolescent handball players during a two-year training cycle. Thirty-one male handball players (age 16.0 ± 0.2 years, body mass 81.4 ± 9.7 kg, body height 188.2 ± 6.4 cm) took part in this study. All tests were conducted three times at the beginning of a one-year training programme. The maximum joint torque (JT) of flexors and extensors of the elbow, shoulder, hip, knee and trunk was measured under static conditions...
August 31, 2018: Journal of Human Kinetics
Lucas A Pereira, César C Cal Abad, Ronaldo Kobal, Katia Kitamura, Rita C Orsi, Rodrigo Ramirez-Campillo, Irineu Loturco
The aim of this study was to compare and examine differences in several neuromuscular assessments between female national Olympic team (Rio-2016) and national college team handball players (2015-Gwangju Summer Universiade). Twenty-eight elite female handball players of the national Brazilian Olympic (n = 12) and college (n = 16) teams participated in this study. The Olympic and college athletes performed the following speed-power tests assessing mean propulsive power (MPP) in loaded jump squat (JS) and bench press (BP) exercises, unloaded squat and countermovement jumps (SJ and CMJ), sprint performance over 5-, 10-, and 20-m, and change of direction ability in a standard Zig-zag test and a T-Test...
August 31, 2018: Journal of Human Kinetics
Daniel D Hodgson, Camila D Lima, Jonathan L Low, David G Behm
Background: Roller massagers are popular devices that are used to improve range of motion (ROM), enhance recovery from muscle soreness, and reduce pain under acute conditions. However, the effects of roller massage training and training frequency are unknown. Purpose: The objective was to compare two different roller massage training frequencies on muscle performance. Study Design: Randomized controlled intervention study. Methods: Twenty-three recreationally active university students were randomly allocated to three groups: control (n=8;), rolling three (3/W; n=8;) and six (6/W; n=7) times per week for four weeks...
August 2018: International Journal of Sports Physical Therapy
Maxime Hertzog, Darren J Paul, George P Nassis, Joao R Silva
The purpose of this longitudinal study was to investigate whether recruitment status influences neuromuscular and endurance performances in academy soccer players over a 2-year training period (from Under-16 to Under-18). Thirty-seven male soccer players from an elite academy were selected and divided in two cohorts according to their recruitment status: Early Recruitment group (ER; n = 16), training and competing for the academy since Under-14 and Under-15 age groups, and; Late Recruitment group (LR; n = 21) included in the academy training process at Under-16...
September 30, 2018: Sports
Antonia Pahl, Anja Wehrle, Sarah Kneis, Albert Gollhofer, Hartmut Bertz
BACKGROUND: Hospitalized cancer patients undergoing intensive or high-dose chemotherapy often experience a considerable decline in functional performance associated with the increased risk of adverse health events. Exercises, particularly resistance-based exercises that may counteract this decline are restricted by therapy-related side effects. Since whole body vibration (WBV) is known to efficiently stimulate the neuromuscular system without significantly raising blood pressure, we hypothesize that especially WBV is particularly feasible even during intensive or high-dose chemotherapy (primary endpoint) and thus induces beneficial functional adaptations...
September 25, 2018: BMC Cancer
Karsten Øvretveit, Tiril Tøien
Øvretveit, K and Tøien, T. Maximal strength training improves strength performance in grapplers. J Strength Cond Res XX(X): 000-000, 2018-The aim of this study was to assess the short-term effects of maximal strength training (MST) as an accessory to grappling training on strength performance in competitive Brazilian jiu-jitsu (BJJ) athletes. Fourteen male BJJ athletes underwent measurements of 1 repetition maximum (1RM) in the squat and bench press, rate of force development (RFD) and peak force (PF) in the squat jump, countermovement jump (CMJ) height, and muscular endurance in pull-ups, sit-ups, and push-ups...
September 21, 2018: Journal of Strength and Conditioning Research
Maamer Slimani, Armin Paravlic, Urs Granacher
It is well-documented that strength training (ST) improves measures of muscle strength in young athletes. Less is known on transfer effects of ST on proxies of muscle power and the underlying dose-response relationships. The objectives of this meta-analysis were to quantify the effects of ST on lower limb muscle power in young athletes and to provide dose-response relationships for ST modalities such as frequency, intensity, and volume. A systematic literature search of electronic databases identified 895 records...
2018: Frontiers in Physiology
Houda Daaloul, Nizar Souissi, Damien Davenne
PURPOSE: It has been suggested that napping is the best recovery strategy for athletes. However, researches on the impacts of napping on athletic performances are scarce. The aim of this study was to determine the effects of a 30-minute nap following a partial sleep deprivation, or a normal night condition, on alertness, fatigue, and cognitive and physical outcomes. METHODS: Thirteen national-level male karate athletes were randomized to experience nap and no-nap conditions, after either a reference or a partial sleep deprivation night...
September 19, 2018: Medicine and Science in Sports and Exercise
Antonio J Morales-Artacho, Amador García-Ramos, Alejandro Pérez-Castilla, Paulino Padial, Angel M Gomez, Antonio M Peinado, Jose L Pérez-Córdoba, Belén Feriche
Morales-Artacho, AJ, García-Ramos, A, Pérez-Castilla, A, Padial, P, Gomez, AM, Peinado, AM, Pérez-Córdoba, JL, and Feriche, B. Muscle activation during power-oriented resistance training: continuous vs. cluster set configurations. J Strength Cond Res XX(X): 000-000, 2018-This study examined performance and electromyography (EMG) changes during a power training protocol comprising continuous or clustered set configurations. Eighteen active males completed 6 sets of 6 repetitions during the loaded (20% 1 repetition maximum) countermovement jump (CMJ) exercise, continuously (n = 9) or with a 30-second pause every 2 repetitions (cluster; n = 9)...
September 17, 2018: Journal of Strength and Conditioning Research
Stacey Emmonds, Sean Scantlebury, Eoin Murray, Luke Turner, Claire Robsinon, Ben Jones
Emmonds, S, Scantlebury, S, Murray, E, Turner, L, Robsinon, C, and Jones, B. Physical characteristics of elite youth female soccer players characterized by maturity status. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this study was to investigate the influence of maturity status on the physical characteristics of youth female soccer players. One hundred fifty-seven players from 3 elite soccer academies in England completed assessments of anthropometry, strength (isometric midthigh pull), lower-body power (countermovement jump [CMJ]), aerobic capacity (Yo-Yo intermittent recovery test level 1), change of direction (CoD: 505-left/right), and speed (10 and 30 m)...
September 7, 2018: Journal of Strength and Conditioning Research
Eduardo Cuenca, Pablo Jodra, Alberto Pérez-López, Liliana G González-Rodríguez, Sandro Fernandes da Silva, Pablo Veiga-Herreros, Raúl Domínguez
As a nitric oxide precursor, beetroot juice (BJ) is known to enhance high-intensity exercise performance (80⁻100% VO2max ) yet its impacts on higher intensity sprint exercise (>100% VO2max ) remain to be established. This study sought to examine the effects of BJ supplementation on performance and subsequent fatigue during an all-out sprint exercise. Using a randomized cross-over, double-blind, placebo-controlled design, 15 healthy resistance-trained men (22.4 ± 1.6 years) ingested 70 mL of either BJ or placebo...
September 4, 2018: Nutrients
Craig A Staunton, Jonathan J Stanger, Daniel W T Wundersitz, Brett A Gordon, Edhem Custovic, Michael I C Kingsley
Staunton, CA, Stanger, JJ, Wundersitz, DW, Gordon, BA, Custovic, E, and Kingsley, MI. Criterion validity of a MARG sensor to assess countermovement jump performance in elite basketballers. J Strength Cond Res XX(X): 000-000, 2018-This study assessed the criterion validity of a magnetic, angular rate, and gravity (MARG) sensor to measure countermovement jump (CMJ) performance metrics, including CMJ kinetics before take-off, in elite basketballers. Fifty-four basketballers performed 2 CMJs on a force platform with data simultaneously recorded by a MARG sensor located centrally on the player's back...
August 23, 2018: Journal of Strength and Conditioning Research
Camila D Lima, Lee E Brown, Cassio V Ruas, David G Behm
Stretching, while enhancing joint flexibility, may also decrease the hamstring:quadriceps (H:Q) strength ratio, which is used to identify knee strength imbalances and lower extremity muscle and ligament injury risk in the practice of sports and other physical activities. Stretching may also decrease muscle force and jump performance. However, these effects may depend on the population in question and mode of stretching. The purpose of this study was to compare the effects of static stretching (SS) and ballistic stretching (BS) on concentric H:Q ratio, squat jump (SJ) and countermovement jump (CMJ) height, and SJ:CMJ ratio between ballet dancers and resistance trained women...
September 15, 2018: Journal of Dance Medicine & Science
Aaron D Heishman, Bryce D Daub, Ryan M Miller, Eduardo D S Freitas, Brett A Frantz, Michael G Bemben
Heishman, AD, Daub, BD, Miller, RM, Freitas, EDS, Frantz, BA, and Bemben, MG. Countermovement jump reliability performed with and without an arm swing in NCAA Division 1 intercollegiate basketball players. J Strength Cond Res XX(X): 000-000, 2018-The countermovement jump (CMJ) is routinely used in athlete performance to quantify adaptions to training, as well as monitor neuromuscular readiness and fatigue. However, controversy remains in whether to incorporate an arm swing during the CMJ (CMJ AS) or keep the hands placed on the hips (CMJ NAS)...
August 21, 2018: Journal of Strength and Conditioning Research
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