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Stefano Benítez-Flores, André R Medeiros, Fabrício Azevedo Voltarelli, Eliseo Iglesias-Soler, Kenji Doma, Herbert G Simões, Thiago Santos Rosa, Daniel A Boullosa
PURPOSE: The aim of this study was to compare the combined effects of resistance and sprint training, with very short efforts (5 s), on aerobic and anaerobic performances, and cardiometabolic health-related parameters in young healthy adults. METHODS: Thirty young physically active individuals were randomly allocated into four groups: resistance training (RTG), sprint interval training (SITG), concurrent training (CTG), and control (CONG). Participants trained 3 days/week for 2 weeks in the high-intensity interventions that consisted of 6-12 "all out" efforts of 5 s separated by 24 s of recovery, totalizing ~ 13 min per session, with 48-72 h of recovery between sessions...
March 16, 2019: European Journal of Applied Physiology
Oliver Gonzalo-Skok, Alejandro Moreno-Azze, José Luis Arjol-Serrano, Julio Tous-Fajardo, Chris Bishop
PURPOSE: This study compared the effects of performing different unilateral strength training interventions on unilateral and bilateral jumping performance and their related asymmetries in young soccer players. METHODS: Forty-five male young (U-17) soccer players were randomly assigned to three eccentric overload training programs: The first group executed the same volume with both legs starting with the weaker leg (SVW, n=15), the second group carried out the double volume with the weaker leg and also starting with the weaker leg (DVW, n=15), and the third group performed the same volume with both legs starting with the stronger leg (SVS, n=15)...
March 12, 2019: International Journal of Sports Physiology and Performance
Alexander J Dinsdale, Athanassios Bissas
Dinsdale, AJ and Bissas, A. Eliciting Postactivation Potentiation With Hang Cleans depends on the recovery duration and the individual's 1 repetition maximum strength. J Strength Cond Res XX(X): 000-000, 2019-Acutely coupling biomechanically similar resistance exercises (e.g., back squats) with subsequent explosive movements (e.g., countermovement jumps [CMJs]) can elicit an enhancement in explosive force and power production, which is known as postactivation potentiation (PAP). However, limited information exists with regard to the coupling of hang cleans with the CMJ...
March 4, 2019: Journal of Strength and Conditioning Research
Lee Taylor, Christopher J Stevens, Heidi R Thornton, Nick Poulos, Bryna C R Chrismas
PURPOSE: Determine how a cooling vest worn during a warm-up could influence selected performance [counter movement jump (CMJ)], physical (GPS metrics) and psycho-physiological (body temperature and perceptual) variables. METHODS: In a randomized crossover design, twelve elite male World Rugby Sevens Series athletes completed an outdoor (WBGT: 23-27°C) match-specific externally-valid 30 min warm-up wearing a phase change cooling vest (VEST) and without (CONTROL), on separate occasions 7 days apart...
March 6, 2019: International Journal of Sports Physiology and Performance
Jonathon Weakley, Kevin Till, John Sampson, Harry Banyard, Cedric Leduc, Kyle Wilson, Greg Roe, Ben Jones
PURPOSE: Feedback can enhance acute physical performance. However, the effects of feedback on physical adaptation has received little attention. Therefore, the purpose of this study was to determine the effect of feedback during a four-week training programme on jump, sprint and strength adaptations. METHODS: Twenty-eight semi-professional male rugby union players were strength-matched into two groups (feedback and non-feedback). During the four-week training programme, the Feedback group received immediate, objective feedback on a) mean concentric velocity during resistance training repetitions, b) distance feedback for standing broad jumps, and c) time for sprints...
March 6, 2019: International Journal of Sports Physiology and Performance
Damir Zubac, Armin Paravlić, Katja Koren, Urzi Felicita, Boštjan Šimunič
OBJECTIVE: This study investigated the effects of an 8-week plyometric training (PT) session on countermovement jump (CMJ) height, take-off velocity, and Tensiomyography (TMG) derived contractile parameters in seniors. METHODS: Twenty-three senior adults (age 66.7±5.2 years) were randomly divided into two groups: PLYO (n=11) and CTRL (n=12). Tensiomyography was measured in vastus lateralis (VL), biceps femoris (BF), tibialis anterior (TA), gastrocnemius medialis (GM), and lateralis (GL)...
March 1, 2019: Journal of Musculoskeletal & Neuronal Interactions
Fernando Pareja-Blanco, Antonio Villalba-Fernández, Pedro J Cornejo-Daza, Juan Sánchez-Valdepeñas, Juan José González-Badillo
The aim of this study was to compare the time course of recovery following four different resistance exercise protocols in terms of loading magnitude (60% vs. 80% 1RM-one-repetition maximum) and velocity loss in the set (20% vs. 40%). Seventeen males performed four different protocols in full squat exercise, which were as follows: (1) 60% 1RM with a velocity loss of 20% (60-20), (2) 60% 1RM with a velocity loss of 40% (60-40), (3) 80% 1RM with a velocity loss of 20% (80-20), and (4) 80% 1RM with a velocity loss of 40% (80-40)...
March 4, 2019: Sports
Chris Bishop, Paul Read, Shyam Chavda, Paul Jarvis, Anthony Turner
The aims of the present study were to determine test-retest reliability for unilateral strength and power tests used to quantify asymmetry and determine the consistency of both the magnitude and direction of asymmetry between test sessions. Twenty-eight recreational trained sport athletes performed unilateral isometric squat, countermovement jump (CMJ) and drop jump (DJ) tests over two test sessions. Inter-limb asymmetry was calculated from both the best trial and as an average of three trials for each test...
March 4, 2019: Sports
Wolfgang Teufl, Markus Miezal, Bertram Taetz, Michael Fröhlich, Gabriele Bleser
3D joint kinematics can provide important information about the quality of movements. Optical motion capture systems (OMC) are considered the gold standard in motion analysis. However, in recent years, inertial measurement units (IMU) have become a promising alternative. The aim of this study was to validate IMU-based 3D joint kinematics of the lower extremities during different movements. Twenty-eight healthy subjects participated in this study. They performed bilateral squats (SQ), single-leg squats (SLS) and countermovement jumps (CMJ)...
2019: PloS One
Steven Hughes, Dale W Chapman, G Gregory Haff, Sophia Nimphius
To assess whether a battery of performance markers, both individually and as group, would be sensitive to fatigue, a within group random cross-over design compared multiple variables during seated control and fatigue (repeated sprint cycling) conditions. Thirty-two physically active participants completed a neuromuscular fatigue questionnaire, Stroop task, postural sway, squat jump, countermovement jump, isometric mid-thigh pull and 10 s maximal sprint cycle (Sprintmax) before and after each condition (15 min, 1 h, 24 h and 48 h)...
2019: PloS One
Dariusz Mroczek, Krzysztof Maćkała, Paweł Chmura, Edward Superlak, Marek Konefał, Tomasz Seweryniak, Dorota Borzucka, Zbigniew Rektor, Jan Chmura
Dariusz, M, Krzysztof, M, Paweł, C, Edward, S, Marek, K, Tomasz, S, Dorota, B, Rektor, Z, and Jan, C. Effects of plyometrics training on muscle stiffness changes in male volleyball players. J Strength Cond Res XX(X): 000-000, 2019-We investigated whether 6 weeks of specific plyometric training (PT) impacts on changes in muscle stiffness and enhances the vertical jumping ability as the indirect evaluation of the explosive power of the lower extremities of male volleyball players. Sixteen male collegiate volleyball players participated in this experiment...
February 14, 2019: Journal of Strength and Conditioning Research
Nikolaos Kontochristopoulos, Gregory C Bogdanis, Giorgos Paradisis, Charilaos Tsolakis
Kontochristopoulos, N, Bogdanis, GC, Paradisis, G, and Tsolakis, C. Effect of a supplementary periodized complex strength training and tapering period on postactivation potentiation of sport-specific explosive performance in adolescent national-level fencers. J Strength Cond Res XX(X): 000-000, 2018-This study examined the effects of strength training and tapering on countermovement jump (CMJ), change of direction (COD), and step-lunge (SL) after a conditioning activity in adolescent fencers. Twenty fencers (age: 15...
February 13, 2019: Journal of Strength and Conditioning Research
Blanca Romero-Moraleda, Jaime González-García, Ángel Cuéllar-Rayo, Carlos Balsalobre-Fernández, Daniel Muñoz-García, Esther Morencos
We aimed to compare the effects between non-vibration foam rolling (NVFR) and vibration foam rolling (VFR) on visual analogic scale (VAS), pressure pain threshold (PPT), oxygen saturation (SmO2), countermovement jump (CMJ) and hip and knee range of movement (ROM) after eliciting muscle damage through eccentric acute exercise using an inertial flywheel. Thirty-eight healthy volunteers (32 men, 6 women; aged 22.2±3.2 years) were randomly assigned in a counter-balanced fashion to either a VFR or NVFR protocol group...
March 2019: Journal of Sports Science & Medicine
Tom Clifford, Matthew Ventress, Dean M Allerton, Sarah Stansfield, Jonathan C Y Tang, William D Fraser, Barbara Vanhoecke, Janne Prawitt, Emma Stevenson
This study examined whether consuming collagen peptides (CP) before and after strenuous exercise alters markers of muscle damage, inflammation and bone turnover. Using a double-blind, independent group's design, 24 recreationally active males consumed either 20 g day-1 of CP or a placebo control (CON) for 7 days before and 2 days after performing 150 drop jumps. Maximal isometric voluntary contractions, countermovement jumps (CMJ), muscle soreness (200 mm visual analogue scale), pressure pain threshold, Brief Assessment of Mood Adapted (BAM +) and a range of blood markers associated with muscle damage, inflammation and bone turnover C-terminal telopeptide of type 1 collagen (β-CTX) and N-terminal propeptides of type 1 pro-collagen (P1NP) were measured before supplementation (baseline; BL), pre, post, 1...
February 19, 2019: Amino Acids
Angeliki-Nikoletta Stasinaki, Nikolaos Zaras, Spyridon Methenitis, Gregory Bogdanis, Gerasimos Terzis
The aim of the study was to investigate the rate of force development (RFD) and muscle architecture early adaptations in response to training with fast- or slow-velocity eccentric squats. Eighteen young novice participants followed six weeks (two sessions/week) of either fast-velocity (Fast) or slow-velocity (Slow) squat eccentric-only training. Fast eccentric training consisted of nine sets of nine eccentric-only repetitions at 70% of 1-RM with <1 s duration for each repetition. Slow eccentric training consisted of five sets of six eccentric-only repetitions at 90% of 1-RM with ~4 sec duration for each repetition...
February 14, 2019: Sports
Vytautas Pliauga, Inga Lukonaitiene, Sigitas Kamandulis, Albertas Skurvydas, Rytis Sakalauskas, Aaron T Scanlan, Jurate Stanislovaitiene, Daniele Conte
This study investigated the effect of block periodization (BP) and traditional periodization (TP) approaches on jumping and sprinting performance in collegiate basketball players during an 8-week pre-season period. Ten collegiate male basketball players (mean±SD; age: 21.5±1.7 years; body mass: 83.5±8.9 kg; stature: 192.5±5.4 cm) from the same team were equally assigned to a training group (BP or TP). BP and TP were designed with different numbers of power sessions (BP=8; TP=16) and recovery days (BP=14; TP=8)...
December 2018: Biology of Sport
Masahiro Horiuchi, Junko Endo, Takashi Sato, Koichi Okita
This study investigated whether jump training with blood flow restriction (BFR) improves jump performance compared to jump training without BFR under similar exercise intensity in healthy young humans. The participants were twenty healthy males who were assigned to either jump training with BFR (n = 10) or jump training without BFR [control (CON); n = 10] groups. All subjects completed five sets of 10 repetitions with one-minute intervals of half-squat jumps (SJ) at maximal effort, four days a week for four weeks...
December 2018: Biology of Sport
Aaron Heishman, Brady Brown, Bryce Daub, Ryan Miller, Eduardo Freitas, Michael Bemben
The purpose of the present investigation was to evaluate differences in Reactive Strength Index Modified (RSIMod ) and Flight Time to Contraction Time Ratio (FT:CT) during the countermovement jump (CMJ) performed without the arm swing (CMJNAS) compared to the CMJ with the arm swing (CMJAS), while exploring the relationship within each variable between jump protocols. A secondary purpose sought to explore the relationship between RSIMod and FT:CT during both jump protocols. Twenty-two collegiate basketball players performed both three CMJNAS and three CMJAS on a force plate, during two separate testing sessions...
February 12, 2019: Sports
Erich Müller, Patrick Pröller, Fatima Ferreira-Briza, Lorenz Aglas, Thomas Stöggl
Purpose: We set out to investigate the effectiveness of grounded sleeping on the time course of recovery with respect to muscle soreness and athletic performance after intensive eccentric muscle loading. Methods: Twenty-two healthy participants were recruited for this study and randomly assigned to an experimental group (GRD, grounded sleeping, n = 12) or control group (UGD, sham-grounded sleeping, n = 10) to evaluate the effects of 10 days recovery with GRD vs. UGD following a single intensive downhill treadmill intervention in a triple-blinded (participant, tester, and data analyst) manner...
2019: Frontiers in Physiology
Rodrigo Ramirez-Campillo, Jason Moran, Benjamin Drury, Mark Williams, Justin W Keogh, Helmi Chaabene, Urs Granacher
Ramirez-Campillo, R, Moran, J, Drury, B, Williams, M, Keogh, JW, Chaabene, H, and Granacher, U. Effects of equal volume but different plyometric jump training intensities on components of physical fitness in physically active young males. J Strength Cond Res XX(X): 000-000, 2019-An 8-week single-blind randomized controlled trial was conducted to compare the effects of separate programs of equal volume, but different intensity, plyometric jump training (PJT), on physical fitness in healthy adults. Thirty-eight physically active males (mean age: 21...
February 6, 2019: Journal of Strength and Conditioning Research
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