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https://www.readbyqxmd.com/read/28646101/serum-androgen-profile-and-physical-performance-in-women-olympic-athletes
#1
Emma Eklund, Bo Berglund, Fernand Labrie, Kjell Carlström, Lena Ekström, Angelica Lindén Hirschberg
BACKGROUND: The role of endogenous androgens for body composition and physical performance in women athletes is still not elucidated. AIM: To examine the serum androgen profile in relation to body composition and physical performance in women Olympic athletes and to compare endocrine variables and body composition to controls. STUDY DESIGN: Cross-sectional study, conducted between 2011 and 2015 at the Women's Health Research Unit, Karolinska University Hospital, Stockholm...
June 23, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28640774/the-difference-between-countermovement-and-squat-jump-performances-a-review-of-underlying-mechanisms-with-practical-applications
#2
Bas Van Hooren, Julia Zolotarjova
Van Hooren, B and Zolotarjova, J. The difference between countermovement and squat jump performances: a review of underlying mechanisms with practical applications. J Strength Cond Res 31(7): 2011-2020, 2017-Two movements that are widely used to monitor athletic performance are the countermovement jump (CMJ) and squat jump (SJ). Countermovement jump performance is almost always better than SJ performance, and the difference in performance is thought to reflect an effective utilization of the stretch-shortening cycle...
July 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28639440/the-relationship-between-jumping-performance-isokinetic-strength-and-dynamic-postural-control-in-elite-youth-soccer-players
#3
Robert Śliwowski, Monika Grygorowicz, Andrzej Wieczorek, Łukasz Jadczak
BACKGROUND: The aim of this study was (i) to investigate the relationship between vertical jumping performance, isokinetic strength of knee extensors/flexors, and postural priority and (ii) an attempt to describe a multiple regression model that accounts for the effects of selected parameters of isokinetic strength and postural priority on vertical jumping performance. METHODS: Thirty-one professional male soccer players, aged from 17 to 20 years, participated in this study (mean age: ± SD 18,6 ± 1...
June 21, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28636435/effects-of-a-contrast-training-programme-on-jumping-sprinting-and-agility-performance-of-prepubertal-basketball-players
#4
Pedro Ángel Latorre Román, Francisco Javier Villar Macias, Felipe García Pinillos
The purpose of this study was to examine the effects of a 10 week contrast training (CT) programme (isometric + plyometric) on jumping, sprinting abilities and agility performance in prepubertal basketball players. Fifty-eight children from a basketball academy (age: 8.72 ± 0.97 years; body mass index: 17.22 ± 2.48 kg/m(2)) successfully completed the study. Participants were randomly assigned to experimental groups (EG, n = 30) and control groups (CG, n = 28). The CT programme was included in the experimental group's training sessions - twice a week - as part of their usual weekly training regime...
June 21, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28598797/physical-fitness-and-obesity-levels-during-an-academic-year-followed-by-summer-holidays-an-issue-of-insufficient-time-for-physical-activity
#5
George Aphamis, Yiannakis Ioannou, Christoforos D Giannaki
Today, available time for physical activity has been continuously decreasing, whilst, school-time physical education (PE) classes appear to be the only real option for many adolescents to engage in physical activity and exercise. The aim of the present study was to investigate fitness and health related parameters over one academic year, and after the summer holidays for adolescents who do not engage in out-of-school physical activities. Participants were 153 students (age: 15-17 years; boys n = 86) who exercised only during PE (2 × 45-min periods per week)...
June 9, 2017: International Journal of Adolescent Medicine and Health
https://www.readbyqxmd.com/read/28597614/the-effects-of-two-different-explosive-strength-training-programs-on-vertical-jump-performance-in-basketball
#6
Simone Ciacci, Sandro Bartolomei
BACKGROUND: The aim of this study was to compare the effects of two different training programs oriented to improve vertical jump performance and leg stiffness in basketball players. METHODS: Fifty-eight male basketball players were involved, divided into three age groups (Senior, U19 and U17). Subsequently, within any age group, the players were randomly divided into two training groups, respectively performing a 16-week "hang-clean" training program (HCL), and a "half-squat" training program (HSQ), lasting for the same duration...
June 8, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28595238/distinguishing-playing-status-through-a-functionally-relevant-performance-measure-in-female-division-i-collegiate-soccer-athletes
#7
Mitchel A Magrini, Ryan J Colquhoun, John H Sellers, Eric C Conchola, Garrett M Hester, Ryan M Thiele, Zach K Pope, Doug B Smith
Although soccer is predominately an endurance sport, high velocity movements may be an important indicator of athletic success. The purpose of this investigation was to establish whether squat jumps (SJ) can differentiate starters from non-starters with a female collegiate division I soccer team. Eighteen female division I soccer athletes were separated into two groups: 9 starters (age: 19.5 ± 1.0; mass = 64.8 ± 11.5 kg; height = 167.5 ± 7.7 cm; games started = 18.2 ± 4.7; minutes played = 1633.8 ± 478...
June 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28579190/effect-of-low-level-laser-therapy-lllt-and-light-emitting-diodes-ledt-applied-during-combined-training-on-performance-and-post-exercise-recovery-protocol-for-a-randomized-placebo-controlled-trial
#8
Aryane Flauzino Machado, Jéssica Kirsch Micheletti, Franciele Marques Vanderlei, Fabio Yuzo Nakamura, Ernesto Cesar Pinto Leal-Junior, Jayme Netto Junior, Carlos Marcelo Pastre
BACKGROUND: Previous studies have shown positive results of phototherapy for improving performance and accelerating recovery; however, the effects of phototherapy during training and after a primary adaptation remain unclear. The aim of this randomized controlled trial is to analyze the effects of phototherapy and combined training on clinical, functional, and psychological outcomes and on vascular endothelial growth factor. METHODS: This randomized placebo-controlled trial by stratified sample will involve 45 healthy male participants...
May 20, 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/28573027/operating-length-and-velocity-of-human-m-vastus-lateralis-fascicles-during-vertical-jumping
#9
Maria Elissavet Nikolaidou, Robert Marzilger, Sebastian Bohm, Falk Mersmann, Adamantios Arampatzis
Humans achieve greater jump height during a counter-movement jump (CMJ) than in a squat jump (SJ). However, the crucial difference is the mean mechanical power output during the propulsion phase, which could be determined by intrinsic neuro-muscular mechanisms for power production. We measured M. vastus lateralis (VL) fascicle length changes and activation patterns and assessed the force-length, force-velocity and power-velocity potentials during the jumps. Compared with the SJ, the VL fascicles operated on a more favourable portion of the force-length curve (7% greater force potential, i...
May 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28566815/training-induced-changes-in-physical-performance-can-be-achieved-without-body-mass-reduction-after-eight-week-of-strength-and-injury-prevention-oriented-programme-in-volleyball-female-players
#10
M Lehnert, M Sigmund, P Lipinska, R Vařeková, M Hroch, Z Xaverová, P Stastny, P Háp, P Zmijewski
The purpose of the study was to analyse the changes in muscle strength, power, and somatic parameters in elite volleyball players after a specific pre-season training programme aimed at improving jumping and strength performance and injury prevention. Twelve junior female volleyball players participated in an 8-week training programme. Anthropometric characteristics, isokinetic peak torque (PT) single-joint knee flexion (H) and extension (Q) at 60º/s and 180º/s, counter movement jump (CMJ), squat jump (SJ), and reactive strength index (RSI) were measured before and after intervention...
June 2017: Biology of Sport
https://www.readbyqxmd.com/read/28530478/validity-of-a-linear-velocity-transducer-for-testing-maximum-vertical-jumps
#11
Alejandro Pérez-Castilla, Belén Feriche, Slobodan Jaric, Paulino Padial, Amador García-Ramos
This study aimed to examine the validity of mechanical variables obtained by a linear velocity transducer from the unconstrained and constrained squat jump (SJ). Twenty-three men were tested on the unconstrained SJ and the SJ constrained by a Smith machine. Maximum values of force, velocity, and power were simultaneously recorded both by a linear velocity transducer attached to a bar of mass of 17, 30, 45, 60 and 75 kg and by a force plate. Linear velocity transducer generally overestimated the outcomes measured as compared to the force plate, particularly in unconstrained SJ...
May 22, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28513281/short-term-effects-of-kinesio-taping-on-muscle-recruitment-order-during-a-vertical-jump-a-pilot-study
#12
Guillermo Mendez-Rebolledo, Rodrigo Ramirez-Campillo, Eduardo Guzman-Muñoz, Valeska Gatica-Rojas, Alexis Dabanch-Santis, Francisco Diaz-Valenzuela
CONTEXT: Kinesio taping is commonly used in sports and rehabilitation settings with the aim of prevention and treatment of musculoskeletal injuries. However, limited evidence exists regarding the effects of 24 and 72 h of kinesio taping on trunk and lower limb neuromuscular and kinetic performance during a vertical jump. OBJECTIVE: The purpose of this study was to analyze the short-term effects of kinesio taping on the height and ground reaction force during a vertical jump, in addition to trunk and lower limb muscle latency and recruitment order...
May 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28511496/effect-of-passive-active-and-combined-warm-up-on-lower-limb-muscle-performance-and-dynamic-stability-in-recreational-sports-players
#13
Kedar Gogte, Prateek Srivastav, Ganesh Balthillaya Miyaru
INTRODUCTION: Warm up is an activity that is done before a sports activity. The warm up can be done actively and passively. The preferred mode is active warm up in athletes. There are inconclusive effects of passive warm up compared with an active warm up on short term muscle performance. The cumulative effect of passive and active warm up on muscle performance and dynamic stability is not known. AIM: To find out the effects of passive, active and combined warm up on lower limb muscle performance and dynamic stability in recreational sports players...
March 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28473614/lower-limb-explosive-strength-capacity-in-elderly-women-effects-of-resistance-training-and-healthy-diet
#14
Peter Edholm, Emelie Strandberg, Fawzi Kadi
The effects of 24-weeks of resistance training combined with a healthy diet on lower limb explosive strength capacity were investigated in a population of healthy elderly women. Participants (n=63; 67.5 ± 0.4 yrs) were randomized into three groups; resistance training (RT), resistance training and healthy diet (RT-HD) and control (CON). Progressive resistance training was performed at a load of 75%-85% 1 RM. A major adjustment in the healthy dietary approach was an n-6/n-3 PUFA ratio below 2. Lower limb maximal strength, explosive force capacity during dynamic and isometric movements, whole body lean mass and physical function were assessed...
May 4, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28469753/the-effect-of-acute-and-chronic-exposure-to-hypobaric-hypoxia-on-loaded-squat-jump-performance
#15
Amador García-Ramos, Paulino Padial, Blanca De la Fuente, Javier Argüelles-Cienfuegos, Juan Bonitch-Góngora, Belén Feriche
The present study aimed (1) to compare loaded squat jump performance after an acute and chronic exposure to a moderate natural altitude between normoxia and hypobaric hypoxia conditions, and (2) to analyze the effect of an altitude training camp on loaded jump squat development. Sixteen male swimmers (17.1 ± 0.8 years) took part in a 17-day training camp at a natural moderate altitude. They were randomly tested in counterbalanced order on days 1 and 3 in normoxia and hypoxia (pretest) and on days 15 and 17 again in normoxia and hypoxia (posttest)...
February 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28456149/plasma-chemerin-in-young-untrained-men-association-with-cardio-metabolic-traits-and-physical-performance-and-response-to-intensive-interval-training
#16
Nejmeddine Ouerghi, Mohamed Kacem Ben Fradj, Marwa Khammassi, Moncef Feki, Naziha Kaabachi, Anissa Bouassida
OBJECTIVES: Chemerin is an adipose tissue-derived adipokine thought to decrease insulin sensitivity and increase cardiometabolic risk. This study aimed to assess the association of chemerin with cardiometabolic risk and physical performance and examine its response to high-intensity interval training (HIIT). METHODS: Eighteen young men have been applied a HIIT program during 8 weeks. Plasma chemerin together with several cardiometabolic factors and physical performance indices were determined before and after the training program...
February 15, 2017: Neuro Endocrinology Letters
https://www.readbyqxmd.com/read/28426516/physical-profiles-of-female-academy-netball-players-by-position
#17
Christopher Thomas, Kemal Thomas Ismail, Robert Simpson, Paul Comfort, Paul A Jones, Thomas Dos'Santos
The purpose of this study was to evaluate the height, body mass and physical characteristics of female academy netball players by position (centers, defenders and shooters). Data were collected on 43 regional academy players during the preseason period and comprised of height and body mass, and physical characteristics (single-leg hop [SLH], squat jump [SJ], countermovement jump [CMJ], 5- and 10-m sprint, 505 and cardiorespiratory fitness). Defenders and shooters demonstrated significantly (p = < 0.05; d ≥ 1...
April 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28426514/comparison-of-the-hang-high-pull-and-loaded-jump-squat-for-the-development-of-vertical-jump-and-isometric-force-time-characteristics
#18
Dustin J Oranchuk, Tracey L Robinson, Zachary J Switaj, Eric J Drinkwater
Weightlifting movements have high skill demands and require expert coaching. Loaded jumps have a comparably lower skill demand, but may be similarly effective for improving explosive performance. The purpose of this study was to compare vertical jump performance, isometric force, and rate of force development (RFD) following a ten-week intervention employing the hang high-pull (hang-pull) or trap-bar jump squat (jump-squat). Eighteen NCAA Division II swimmers (8 males, 10 females) with at least one year of resistance training experience volunteered to participate...
April 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28416900/measurement-errors-when-estimating-the-vertical-jump-height-with-flight-time-using-photocell-devices-the-example-of-optojump
#19
A Attia, W Dhahbi, A Chaouachi, J Padulo, D P Wong, K Chamari
Common methods to estimate vertical jump height (VJH) are based on the measurements of flight time (FT) or vertical reaction force. This study aimed to assess the measurement errors when estimating the VJH with flight time using photocell devices in comparison with the gold standard jump height measured by a force plate (FP). The second purpose was to determine the intrinsic reliability of the Optojump photoelectric cells in estimating VJH. For this aim, 20 subjects (age: 22.50±1.24 years) performed maximal vertical jumps in three modalities in randomized order: the squat jump (SJ), counter-movement jump (CMJ), and CMJ with arm swing (CMJarm)...
March 2017: Biology of Sport
https://www.readbyqxmd.com/read/28394833/optimizing-half-squat-post-activation-potential-load-in-squat-jump-training-for-eliciting-relative-maximal-power-in-ski-jumpers
#20
A Gołaś, M Wilk, P Statsny, A Maszczyk, K Pajerska, A Zajac
Training load manipulation in a single workout session can increase or decrease training effectiveness in terms of athlete's strength or power gains. In ski jumping the complex training that elicits maximal power gains may take advantage of the post activation potentiation mechanism (PAP). The aim of research was to evaluate the changes in rate of force development (RFD), rate of power development (RPD) and jump height during a complex training session consisted of the barbell half squat (Sq) as an conditioning exercise with loads ranged between 60-100% of 1 repetition maximum (1RM), followed by a body weight squat jump (SqJ) as a performance task...
April 7, 2017: Journal of Strength and Conditioning Research
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