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Squat jump

Fabrício E Rossi, Brad J Schoenfeld, Skyler Ocetnik, Jonathan Young, Andrew Vigotsky, Bret Contreras, James W Krieger, Michael G Miller, Jason Cholewa
BACKGROUND: The purpose of this study was to compare strength, body composition, and functional outcome measures following performance of the back squat, leg press, or a combination of the two exercises. METHODS: Subjects were pair-matched based on initial strength levels and then randomly assigned to 1 of 3 groups: A squat-only group (SQ) that solely performed squats for the lower body; a leg press-only group (LP) that solely performed leg presses for the lower body, or; a combined squat and leg press group (SQ-LP) that performed both squats and leg presses for the lower body...
October 13, 2016: Journal of Sports Medicine and Physical Fitness
Alejandro Rodríguez-Fernández, Javier Sánchez Sánchez, José A Rodríguez-Marroyo, David Casamichana, José G Villa
BACKGROUND: Numerous studies have analyzed during competitive season different conditioning programs to improve soccer players' repeat sprint ability (RSA). However, few studies have focused on analysing what happens with this ability after small-sided games (SSG)-based training. Thus, the aim of this study was to determine the changes in physical performance after 5-weeks of pre-season training composed of SSGs in amateur soccer players. METHODS: Twenty-four male soccer players performed RSA, a sit-and-reach and two vertical jump (squat and counter movement jump) tests before and after 5-weeks of pre- season training using fundamentally SSGs...
October 13, 2016: Journal of Sports Medicine and Physical Fitness
I Loturco, F Y Nakamura, R Kobal, S Gil, B Pivetti, L A Pereira, H Roschel
It is unknown whether traditional periodization of strength-power training involving accumulation, transformation and realization blocks is superior to other simpler and more practical training schemes. The purpose of this study was thus to investigate changes in strength/power/speed characteristics of elite soccer players in response to either classic strength-power periodization (TSP) or optimum power load (OPL). 23 professional soccer players were randomly assigned to TSP or OPL for 6 weeks in-season regular training (3 times per week)...
October 5, 2016: International Journal of Sports Medicine
S Manderoos, N Wasenius, M K Laine, U M Kujala, E Mälkiä, J Kaprio, S Sarna, H M Bäckmand, J A Kettunen, O J Heinonen, A M Jula, S Aunola, J G Eriksson
The aim of this cross-sectional study was to compare mobility and muscle strength in male former elite endurance and power athletes aged 66-91 years (n = 150; 50 men in both former elite athlete groups and in their control group). Agility, dynamic balance, walking speed, chair stand, self-rated balance confidence (ABC-scale), jumping height, and handgrip strength were assessed. Former elite power athletes had better agility performance time than the controls (age- and body mass index, BMI-adjusted mean difference -3...
October 5, 2016: Scandinavian Journal of Medicine & Science in Sports
Emilija Stojanović, Vladimir Ristić, Daniel Travis McMaster, Zoran Milanović
BACKGROUND: Plyometric training is an effective method to prevent knee injuries in female athletes; however, the effects of plyometric training on jump performance in female athletes is unclear. OBJECTIVE: The aim of this systematic review and meta-analysis was to determine the effectiveness of plyometric training on vertical jump (VJ) performance of amateur, collegiate and elite female athletes. METHODS: Six electronic databases were searched (PubMed, MEDLINE, ERIC, Google Scholar, SCIndex and ScienceDirect)...
October 4, 2016: Sports Medicine
Paige E Rice, Courtney L Goodman, Christopher R Capps, N Travis Triplett, Travis M Erickson, Jeffrey M McBride
The purpose of this study was to compare force- and power-time curve variables during jumping between Division I strength-matched male and female basketball athletes. Males (n = 8) and females (n = 8) were strength matched by testing a one-repetition maximum (1RM) back squat. 1RM back squat values were normalised to body mass in order to demonstrate that strength differences were a function of body mass alone. Subjects performed three countermovement jumps (CMJ) at maximal effort. Absolute and relative force- and power-time curve variables from the CMJs were analysed between males and females...
October 1, 2016: European Journal of Sport Science
Luis Peñailillo, Nicolás Guzmán, José Cangas, Alvaro Reyes, Hermann Zbinden-Foncea
: The aim of this study was to examine the metabolic demand and extent of muscle damage of eccentric cycling targeting knee flexor (FLEX) and knee extensor (EXT) muscles. METHODS: Eight sedentary men (23.3 ± 0.7 y) underwent two eccentric cycling sessions (EXT and FLEX) of 30 min each, at 60% of the maximum power output. Oxygen consumption (VO2), heart rate (HR) and rated perceived exertion (RPE) were measured during cycling. Countermovement and squat jumps (CMJ and SJ), muscle flexibility, muscle soreness and pain pressure threshold (PPT) of knee extensor and flexor muscles were measured before, immediately after and 1-4 days after cycling...
August 15, 2016: European Journal of Sport Science
T Exell, G Irwin, M Gittoes, D Kerwin
The aim of this study was to empirically examine the interaction of athlete-specific kinematic kinetic and strength asymmetry in sprint running. Bilateral ground reaction force and kinematic data were collected during maximal velocity (mean = 9.05 m/s) sprinting for eight athletes. Bilateral ground reaction force data were also collected while the same athletes performed maximal effort squat jumps. Using novel composite asymmetry scores, interactions between kinematic and kinetic asymmetry were compared for the group of sprinters...
September 27, 2016: Scandinavian Journal of Medicine & Science in Sports
Noriaki Maeda, Yukio Urabe, Junpei Sasadai, Akira Miyamoto, Masahito Murakami, Junichi Kato
CONTEXT: Whole-body vibration (WBV) stimulus equipment has been used as a new training method for health promotion. Its use of in its clinical has expanded to the field of sports and rehabilitation for disabled patients. WBV training is rapidly gaining popularity in health and fitness centers as an alternative method for improving muscle performance. Acute positive effects of WBV have been shown on lower extremity muscle power and the ability of vertical jump, however there have not been any studies focusing on the long-term effects of WBV for trunk muscle and dynamic balance...
August 24, 2016: Journal of Sport Rehabilitation
Ram Haddas, Steven F Sawyer, Phillip S Sizer, Toby Brooks, Ming-Chien Chyu, C Roger James
INTRODUCTION: Recurrent LBP (rLBP) and neuromuscular fatigue are independently thought to increase the risk of lower extremity (LE) injury. Volitional preemptive abdominal contraction (VPAC) is thought to improve lumbar spine and pelvis control in individuals with rLBP. The effects of VPAC on fatigued landing performance in individuals with rLBP are unknown. OBJECTIVES: To determine the effects of VPAC and LE fatigue on landing performance in a rLBP population. DESIGN: Cross-sectional pretest-posttest cohort control design...
August 24, 2016: Journal of Sport Rehabilitation
Lachlan P James, Emma M Beckman, Vincent G Kelly, G Gregory Haff
PURPOSE: To determine whether the maximal strength, impulse and power characteristics of competitive mixed martial arts (MMA) athletes differ according to competition level. METHODS: Twenty-nine male semi-professional and amateur MMA competitors were stratified into either higher-level (HL) or lower-level (LL) performers on the basis of competition grade and success. The one-repetition maximum (1RM) squat was used to assess lower body dynamic strength, while a spectrum of impulse, power, force and velocity variables were evaluated during an incremental load jump squat...
September 15, 2016: International Journal of Sports Physiology and Performance
Jacob E Earp, Robert U Newton, Prue Cormie, Anthony J Blazevich
INTRODUCTION: Tendon dynamics influence movement performance and provide the stimulus for long-term tendon adaptation. As tendon strain increases with load magnitude and decreases with loading rate, changes in movement speed during exercise should influence tendon strain. METHODS: Ten resistance-trained men [squat one repetition maximum (1RM) to body mass ratio: 1.65 ± 0.12] performed parallel-depth back squat lifts with 60% of 1RM load at three different speeds: slow fixed-tempo (TS: 2-s eccentric, 1-s pause, 2-s concentric), volitional-speed without a pause (VS) and maximum-speed jump (JS)...
2016: Frontiers in Physiology
Christopher Newell, Barbara Ramage, Alberto Nettel-Aguirre, Ion Robu, Aneal Khan
Metabolic diseases that lead to neuromuscular, bone, and joint involvement can reduce ambulation and quality of life. Using jumping mechanography, we developed a novel assessment, peak jump power (PJP), and related this to ambulatory ability in patients either having a known or suspected underlying rare disease. From adults and children, we recruited 88 healthy controls and 115 patients (61 with mitochondrial disease and 54 with another diagnosis). Patients were categorized as having no complaints of weakness or ambulation (ambulatory competent; AC), weakness but able to ambulate without aids (ambulatory weakness; AW), or not able to ambulate without aids such as a walker, cane, or wheelchair (ambulatory assistance; AA)...
September 13, 2016: JIMD Reports
Fernando Pareja-Blanco, Luis Sánchez-Medina, Luis Suárez-Arrones, Juan José González-Badillo
AIM: To analyze the effects of two resistance training (RT) programs that used the same relative loading but different repetition volume, using the velocity loss during the set as the independent variable: 15% (VL15) vs. 30% (VL30). METHODS: Sixteen professional soccer players with RT experience (age 23.8 ± 3.5 years, body mass 75.5 ± 8.6 kg) were randomly assigned to two groups: VL15 (n = 8) or VL30 (n = 8) that followed a 6-week (18 sessions) velocity-based squat training program...
September 6, 2016: International Journal of Sports Physiology and Performance
Kris Beattie, Brian P Carson, Mark Lyons, Ian C Kenny
Cycling economy (CE), power at maximal oxygen uptake (WV̇O2max) and anaerobic function (i.e. sprinting ability) are considered to be the best physiological performance indicators in elite road cyclists. In addition to cardiovascular function, these physiological indicators are partly dictated by neuromuscular factors. One technique to improve neuromuscular function in athletes is through strength training. The aim of this study was to investigate the effect of a 20 week maximal- and explosive-strength training intervention on strength (maximal- , explosive-strength & bike-specific explosive-strength), WV̇O2max, CE and body composition (body mass, fat & lean mass) in cyclists...
September 6, 2016: International Journal of Sports Physiology and Performance
D J Ramos-Campo, J A Rubio-Arias, M Carrasco-Poyatos, P E Alcaraz
The aim of this study was to determine the parameters distinguishing top female futsal players from lower level players. Twenty-seven female futsal players participated in the study, composed of professional first division (elite; n = 15) players and semi-professional second division players (sub-elite; n = 14). Active and passive straight leg raise tests, isokinetic strength of the knee extensor and flexor muscles at 60° · s(-1) angular velocity, squat and counter movement jumps, 30 m sprint, 30 m agility, repeated sprint ability test and maximum ball speed during shooting were measured...
September 2016: Biology of Sport
I Loturco, Ccc Abad, F Y Nakamura, S P Ramos, R Kobal, S Gil, L A Pereira, Fhp Burini, H Roschel, C Ugrinowitsch, V Tricoli
The aim was to investigate the effects of far infrared (FIR) ray emitting clothes on indirect markers of exercise-induced muscle damage and physical performance recovery after a plyometric bout applied to soccer players. Twenty-one male players (18.9±0.6 years; 70.8±5.01 kg; 178.3±0.06 cm) performed 100 drop-jumps. Six hours after the bout, athletes put on FIR clothes (FIR) (density of 225 g·m(-2), 88% far infrared rays emitting polyamide 66 Emana yarn (PA66) fibre, 12% Spandex, emissivity of 0.88 and power emitted of 341 W/m2µm at 37°C in the 5-20 µm wavelength range, patent WO 2009/077834 A2) (N = 10) or placebo clothes (PLA) (N = 11)...
September 2016: Biology of Sport
J L Ayers, M DeBeliso, T G Sevene, K J Adams
Olympic weightlifting movements and their variations are believed to be among the most effective ways to improve power, strength, and speed in athletes. This study investigated the effects of two Olympic weightlifting variations (hang cleans and hang snatches), on power (vertical jump height), strength (1RM back squat), and speed (40-yard sprint) in female collegiate athletes. 23 NCAA Division I female athletes were randomly assigned to either a hang clean group or hang snatch group. Athletes participated in two workout sessions a week for six weeks, performing either hang cleans or hang snatches for five sets of three repetitions with a load of 80-85% 1RM, concurrent with their existing, season-specific, resistance training program...
September 2016: Biology of Sport
Caleb D Bazyler, Satoshi Mizuguchi, Alex P Harrison, Kimitake Sato, Ashley A Kavanaugh, Brad H DeWeese, Michael H Stone
The purpose of this study was to examine the effects of an overreach and taper on measures of muscle architecture, jumping, and throwing performance in Division I collegiate throwers preparing for conference championships. Six collegiate track and field throwers (3 hammer, 2 discus, 1 javelin) trained for 12 weeks using a block-periodization model culminating with a one week overreach followed by a 3 week taper (ORT). Session rating of perceived exertion training load (RPETL) and strength training volume-load times bar displacement (VLd) were recorded weekly...
August 26, 2016: Journal of Strength and Conditioning Research
Tommy Henriksson, Jason D Vescovi, Anncristine Fjellman-Wiklund, Kajsa Gilenstam
OBJECTIVES: The purpose of this study was to examine whether field-based and/or laboratory-based assessments are valid tools for predicting key performance characteristics of skating in competitive-level female hockey players. DESIGN: Cross-sectional study. METHODS: Twenty-three female ice hockey players aged 15-25 years (body mass: 66.1±6.3 kg; height: 169.5±5.5 cm), with 10.6±3.2 years playing experience volunteered to participate in the study...
2016: Open Access Journal of Sports Medicine
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