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https://www.readbyqxmd.com/read/29466272/is-vertical-jump-height-an-indicator-of-athletes-power-output-in-different-sport-modalities
#1
Rafael L Kons, Jonathan Ache-Dias, Daniele Detanico, Jonathan Barth, Juliano Dal Pupo
Kons, RL, Ache-Dias, J, Detanico, D, Barth, J, and Dal Pupo, J. Is vertical jump height an indicator of athletes' power output in different sports modalities? J Strength Cond Res 32(3): 708-715, 2018-This study aimed to identify whether the ratio standard is adequate for the scaling of peak power output (PPO) for body mass (BM) in athletes of different sports and to verify classification agreement for athletes involved in different sports using PPO scaled for BM and jump height (JH). One hundred and twenty-four male athletes divided into 3 different groups-combat sports, team sports, and runners-participated in this study...
March 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29466269/neuromuscular-effects-to-6-weeks-of-loaded-countermovement-jumping-with-traditional-and-daily-undulating-periodization
#2
Boris Ullrich, Thiemo Pelzer, Mark Pfeiffer
Ullrich, B, Pelzer, T, and Pfeiffer, M. Neuromuscular effects to 6 weeks of loaded countermovement jumping with traditional and daily undulating periodization. J Strength Cond Res 32(3): 660-674, 2018-Loaded vertical jumps are routinely used to enhance athlete's power production in the lower extremity and to optimize jumping and sprinting performance. This study compared traditional (TP) and daily undulating (DUP) periodization on muscle strength, jumping performance, electromyographic (EMG) muscle activity, and muscle architecture during preseason loaded jump training...
March 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29465606/test-retest-reliability-and-concurrent-validity-of-athletic-performance-combine-tests-in-6-15-year-old-male-athletes
#3
Zachary M Gillen, Amelia A Miramonti, Brianna D McKay, Todd J Leutzinger, Joel T Cramer
Athletic performance combine tests are used by high school, collegiate, and professional American football programs to evaluate performance; however, limited evidence is available on performance combine test results in youth athletes. The purposes of this study were to report test-retest reliability statistics and evaluate concurrent validity among combine performance tests in 6-15-year olds male athletes. Sixty-nine young male athletes (mean ± SD; age = 10.9 ± 2.1-years, height = 154.4 ± 13.6cm, body mass = 46...
February 15, 2018: Journal of Strength and Conditioning Research
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/29463354/adrenal-stress-and-physical-performance-during-military-survival-training
#5
Tunde K Szivak, Elaine C Lee, Catherine Saenz, Shawn D Flanagan, Brian C Focht, Jeff S Volek, Carl M Maresh, William J Kraemer
INTRODUCTION: The purpose of this research was to evaluate neuroendocrine and physical performance responses in sailors and Marines undergoing U.S. Navy Survival, Evasion, Resistance, and Escape (SERE) training. METHODS: Participants were 20 men (Age: 25.3 ± 3.6 yr; Height: 178.1 ± 6.1 cm; Weight: 83.7 ± 12.6 kg). Men were further split into high fit (N = 10) and low fit (N = 10) subgroups based on physical fitness test scores. Blood samples were obtained at baseline (T1), stress (T2), and recovery (T3) timepoints, and were analyzed for plasma epinephrine, plasma norepinephrine, plasma dopamine, serum cortisol, serum testosterone, and plasma neuropeptide Y...
February 1, 2018: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/29462101/predicting-diaphyseal-cortical-bone-status-using-measures-of-muscle-force-capacity
#6
Simon Higgins, Chester M Sokolowski, Megha Vishwanathan, Jessica G Anderson, Michael D Schmidt, Richard D Lewis, Ellen M Evans
PURPOSE: Muscle cross sectional area (MCSA) is often used as a surrogate for the forces applied to bones during physical activity. Though MCSA is a strong predictor of cortical bone status, its use makes assumptions about the relationship between muscle size and force that are inaccurate. Furthermore, to measure MCSA and other muscle force surrogates typically requires expensive and/or radiative laboratory equipment. Thus, this study aimed to determine whether clinical lab- and field-based methodologies for measuring muscular force capacity accounted for similar variance in diaphyseal cortical bone status as a commonly used muscular force surrogate; MCSA, at the mid-tibia in young men and women...
February 16, 2018: Medicine and Science in Sports and Exercise
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
#7
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/29461416/relationship-between-physiologic-tests-body-composition-changes-and-on-ice-playing-time-in-canadian-collegiate-hockey-players
#8
Patrick Delisle-Houde, Nathan A Chiarlitti, Ryan E R Reid, Ross E Andersen
Hockey player's body composition and physical fitness are suggested to influence coaching decisions regarding on-ice playing time. The purpose of this study was to explore the relationship between seasonal body composition changes, off-ice pre-season testing and on-ice metrics. Twenty-one Canadian collegiate hockey players (22.70 ± 1.30 years old, 181.0 ± 5.92 cm, 86.52 ± 6.41 kg) underwent off-ice physical testing at the beginning of their season, and had one total body dual energy x-ray absorptiometry scan at the beginning and end of the season...
February 14, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29443905/a-comparison-of-military-and-law-enforcement-body-armour
#9
Robin Orr, Ben Schram, Rodney Pope
Law-enforcement officers increasingly wear body armour for protection; wearing body armour is common practice in military populations. Law-enforcement and military occupational demands are vastly different and military-styled body armour may not be suitable for law-enforcement. This study investigated differences between selected military body armour (MBA: 6.4 kg) and law-enforcement body armour (LEBA: 2.1 kg) in impacts on postural sway, vertical jump, agility, a functional movement screen (FMS), task simulations (vehicle exit; victim recovery), and subjective measures...
February 14, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29404655/concomitant-injuries-may-not-reduce-the-likelihood-of-achieving-symmetrical-muscle-function-one%C3%A2-year-after-anterior-cruciate-ligament-reconstruction-a-prospective-observational-study-based-on-263-patients
#10
Eric Hamrin Senorski, Eleonor Svantesson, Susanne Beischer, Christoffer Thomeé, Alberto Grassi, Ferid Krupic, Roland Thomeé, Jón Karlsson, Kristian Samuelsson
PURPOSE: A better understanding of patient characteristics and the way common concomitant injuries affect the recovery of muscle function after surgery should help providers to treat patients with anterior cruciate ligament (ACL) injuries. The aim of this study was to determine whether patient characteristics, concomitant injuries and graft choice at ACL reconstruction were associated with symmetrical knee muscle function at one year. The hypothesis was that the presence of concomitant injuries would negatively influence the opportunity to achieve symmetrical knee function at the one-year follow-up...
February 5, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29401198/an-analysis-of-the-effects-of-sex-and-age-on-upper-and-lower-body-power-for-law-enforcement-agency-recruits-prior-to-academy-training
#11
Robert G Lockie, J Jay Dawes, Robin M Orr, Michael Stierli, Joseph M Dulla, Ashley J Orjalo
Power is an important characteristic for law enforcement officers. Tasks such as carrying or dragging a civilian to safety, jumping or vaulting, and suspect restraint and pursuit, require power to be effective. Certain recruits may be lacking in these qualities even if they have been accepted to a law enforcement agency (LEA). This study investigated upper- and lower-body power in male and female LEA recruits, and recruits of different ages, prior to academy training. Retrospective analysis of recruit data from one LEA was conducted...
February 1, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29401197/effects-of-an-8-weeks-body-weight-neuromuscular-training-on-dynamic-balance-and-vertical-jump-performances-in-elite-junior-skiing-athletes-a-randomized-controlled-trial
#12
Jacopo Antonino Vitale, Antonio La Torre, Giuseppe Banfi, Matteo Bonato
The aim of the present randomized controlled trial was to evaluate the effects of an 8-weeks neuromuscular training program focused on core stability, plyometric, and body-weight strengthening exercises on dynamic-postural control and vertical jump performance in elite junior skiers. Twenty-four Italian elite junior male skiers were recruited and randomized to either an experimental group, performing neuromuscular warm-up exercises, (EG; n = 12; age 18 ± 1 years; body mass 66 ± 21 kg; height 1.70 ± 0.1 m) or a control group involved in a standard warm-up (CG; n = 12; age 18 ± 1 years; body mass 62 ± 14 kg; height 1...
February 1, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29401192/examination-of-a-multi-ingredient-pre-workout-supplement-on-total-volume-of-resistance-exercise-and-subsequent-strength-and-power-performance
#13
Haley C Bergstrom, M Travis Byrd, Brian J Wallace, Jody L Clasey
This study examined the acute effects of a multi-ingredient pre-workout supplement on: 1) total, lower, and upper body volume of resistance exercise; and 2) the subsequent lower body strength (isokinetic leg extension and flexion), lower (vertical jump [VJ] height), upper body power (bench-throw velocity [BTv]), and cycle ergometry performance (critical power [CP] and anaerobic work capacity [AWC]). Twelve men completed baseline strength and power measures prior to two experimental visits, supplement (SUP) and placebo (PL)...
February 1, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29397998/comparison-of-lower-limb-kinetics-kinematics-and-muscle-activation-during-drop-jumping-under-shod-and-barefoot-conditions
#14
Keiji Koyama, Junichiro Yamauchi
This study was to investigate the acute effects of wearing shoes on lower limb kinetics, kinematics and muscle activation during a drop jump. Eighteen healthy men performed a drop jump under barefoot and shod conditions. Vertical ground reaction force (GRF) was measured on a force plate during the contact phase of a drop jump, and GRF valuables were calculated for each condition. The angles of the knee and ankle joints, and the foot strike angle (the angle between the plantar surface of the foot and the ground during ground contact) as well as the electromyography of 7 muscles were measured...
January 12, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29394148/effects-of-intermittent-hypoxic-training-performed-at-high-hypoxia-level-on-exercise-performance-in-highly-trained-runners
#15
Anthony M J Sanchez, Fabio Borrani
This study exanimated the effects of intermittent hypoxic training (IHT) conducted at a high level of hypoxia with recovery at ambient air on aerobic/anaerobic capacities at sea level and hematological variations. According to a double-blind randomized design, fifteen highly endurance-trained runners completed a 6-weeks regimented training with 3 sessions per week consisting of intermittent runs (6x work-rest ratio of 5':5') on a treadmill at 80-85% of maximal aerobic speed ([Formula: see text]). Nine athletes (hypoxic group, HG) performed the exercise bouts at FI02 = 10...
February 2, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29389695/anthropometric-and-athletic-performance-combine-test-results-among-positions-within-grade-levels-of-high-school-aged-american-football-players
#16
Todd J Leutzinger, Zachary M Gillen, Amelia M Miramonti, Brianna D McKay, Alegra I Mendez, Joel T Cramer
The purpose of the present study was to investigate differences among player positions at three grade levels in elite, collegiate-prospective American football players. Participants' data (n = 7,160) were analyzed for this study [mean height (Ht) ± standard deviation (SD) = 178 ± 7 cm, weight (Wt) = 86 ± 19 kg]. Data were obtained from 12 different high school American football recruiting combines hosted by Zybek Sports (Boulder, Colorado). Eight two-way (9x3) mixed factorial ANOVAs [position (defensive back (DB), defensive end (DE), defensive lineman (DL), linebacker (LB), offensive lineman (OL), quarterback (QB), running back (RB), tight end (TE), and wide receiver (WR) x grade (freshmen, sophomores, and juniors)] were used to test for differences among the mean test scores for each combine measure [Ht, Wt, 40-yard (40yd) dash, pro-agility drill (PA), L-cone drill (LC), vertical jump (VJ), and broad jump (BJ)]...
January 30, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29389694/acute-effects-of-ballistic-vs-passive-static-stretching-involved-in-a-pre-match-warm-up-regarding-vertical-jump-and-linear-sprint-performance-in-soccer-players
#17
Samuel López Mariscal, Víctor Sánchez Garcia, José Carlos Fernández-García, Eduardo Sáez de Villarreal
The purpose of this study was to compare the effects of introducing passive static and ballistic stretching in a standard soccer match warm-up. The variables addressed were the Counter Movement Jump (CMJ), Abalakov jump and the 40 m linear sprint. The sample was composed of 33 male subjects, divided in two age groups. U16 and adult players formed the groups, in order to cross check if there were differences between them. Each group was further subdivided into two groups regarding the type of stretching carried out during the stretching phase...
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
#18
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/29377306/limb-asymmetry-during-recovery-from-anterior-cruciate-ligament-reconstruction
#19
Kristen E Renner, Christopher T Franck, Thomas K Miller, Robin M Queen
There is limited literature that follows a population of Anterior Cruciate Ligament Reconstruction (ACLR) patients through recovery. Our aim was to examine differences in movement and loading patterns across time and between limbs over four visits during 12 months post-ACLR. We hypothesized that kinematic and kinetic data during a stop-jump would have time and limb dependent differences through 12 months post-surgery. Twenty-three ACLR athletes performed five vertical stop-jumps at 4, 5, 6, and 12 months post-op with motion capture and force plate data collection...
January 29, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29373428/a-four-week-unstructured-break-improved-athletic-performance-in-collegiate-rugby-players
#20
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
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