The role of maximal strength and load on initial power production.

abstract：PURPOSE:This study aimed to catalog the relationships between step-based accelerometer metrics indicative of physical activity volume (steps per day, adjusted to a pedometer scale), intensity (mean steps per minute from the highest, not necessarily consecutive, minutes in a day; peak 30-min cadence), and sedentary beha...

journal_title：Medicine and science in sports and exercise

authors： Tudor-Locke C,Schuna JM Jr,Han HO,Aguiar EJ,Green MA,Busa MA,Larrivee S,Johnson WD

更新日期：2017-02-01 00:00:00

abstract：:Although hyponatremia (HN) has been reported among endurance athletes, its etiology often remains uncertain and of great interest to clinicians and physiologists. This case report presents physiologic evidence regarding the etiology and development of HN during exercise in the heat. A 21-yr-old male volunteer (K.G.) u...

journal_title：Medicine and science in sports and exercise

authors： Armstrong LE,Curtis WC,Hubbard RW,Francesconi RP,Moore R,Askew EW

更新日期：1993-05-01 00:00:00

abstract：PURPOSE:To examine the relationship between variable lower-limb coordination and shoulder joint kinetics and kinematics in the high-performance flat first serve in tennis. METHODS:Three-dimensional data describing three flat serve (FS) techniques, each executed with varying lower-limb involvement: foot-up (FU), foot-b...

journal_title：Medicine and science in sports and exercise

authors： Reid M,Elliott B,Alderson J

更新日期：2008-02-01 00:00:00

abstract：PURPOSE:The purpose of this study was to determine whether there is a relationship between overall fitness improvement and varying amounts of running and movement mileage. METHODS:Subjects were male U.S. Navy recruits (N = 1703, 25 divisions), ages 17-35 yr (mean age = 20.1 +/- 2.9 yr), who attended boot camp from Apr...

journal_title：Medicine and science in sports and exercise

authors： Trank TV,Ryman DH,Minagawa RY,Trone DW,Shaffer RA

更新日期：2001-06-01 00:00:00

abstract：PURPOSE:This study was designed to determine whether serum leptin levels were affected by a 5-d military course after 3 wk of combat training. METHODS:26 male soldiers (mean age = 21 +/- 2 yr) were examined at the beginning of the training program and just at the end of the 5-d course. The combination of continuous he...

journal_title：Medicine and science in sports and exercise

authors： Gomez-Merino D,Chennaoui M,Drogou C,Bonneau D,Guezennec CY

更新日期：2002-10-01 00:00:00

abstract：PURPOSE:This study aimed to determine the effect of acute exercise on the proliferation and expression of activation markers on T-lymphocytes. METHODS:Seventeen well-trained male endurance runners completed 60 min of treadmill running at 95% of ventilatory threshold and a resting, no exercise, control session at the s...

journal_title：Medicine and science in sports and exercise

authors： Green KJ,Rowbottom DG,Mackinnon LT

更新日期：2003-04-01 00:00:00

abstract：PURPOSE:the objective of this study was to characterize the biomechanical effects of step rate modification during running on the hip, knee, and ankle joints so as to evaluate a potential strategy to reduce lower extremity loading and risk for injury. METHODS:three-dimensional kinematics and kinetics were recorded fro...

journal_title：Medicine and science in sports and exercise

authors： Heiderscheit BC,Chumanov ES,Michalski MP,Wille CM,Ryan MB

更新日期：2011-02-01 00:00:00

abstract：PURPOSE:Time-resolved near-infrared spectroscopy was used to quantify tissue oxy- and deoxyhemoglobin concentrations ([HbO2] and [HbR]) and O2 saturation (stO2) in the oblique fibers of the vastus medialis muscle and brain prefrontal cortex during knee extension with and without blood flow restriction (BFR). METHODS:S...

journal_title：Medicine and science in sports and exercise

authors： Ganesan G,Cotter JA,Reuland W,Cerussi AE,Tromberg BJ,Galassetti P

更新日期：2015-01-01 00:00:00

abstract：:The way in which athletes achieve the necessary height to accomplish the rotational requirements of springboard dives was investigated by focusing upon the take-offs of dives from the forward and reverse groups. Films of eight women in the 3-m final of the 1982 Canadian championship and of five men practicing for the ...

journal_title：Medicine and science in sports and exercise

authors： Miller DI,Munro CF

更新日期：1984-06-01 00:00:00

abstract：PURPOSE:Text books attribute the side pain "stitch" during exercise to changes in blood flow to the viscera, but the little available research favors stretching of visceral ligaments. We therefore induced and modified stitch experimentally to investigate its cause and possible treatments. METHODS:Ten active healthy yo...

journal_title：Medicine and science in sports and exercise

authors： Plunkett BT,Hopkins WG

更新日期：1999-08-01 00:00:00

abstract：PURPOSE:Approximately 6500 high school football athletes are treated annually for exertional heat illness (EHI). In 2009, the National Athletic Trainers Association (NATA)-led Inter-Association Task Force (NATA-IATF) released preseason heat acclimatization guidelines to help athletes become accustomed to environmental ...

journal_title：Medicine and science in sports and exercise

authors： Kerr ZY,Marshall SW,Comstock RD,Casa DJ

更新日期：2014-01-01 00:00:00

abstract：PURPOSE:The purpose of this study was to evaluate energy balance and body composition in 42 gymnasts (mean age = 15.5 yr) and 20 runners (mean age = 26.6 yr), all of whom were on national teams or were nationally ranked. METHODS:Athletes were assessed for body composition using DEXA and skinfolds, and energy balance w...

journal_title：Medicine and science in sports and exercise

authors： Deutz RC,Benardot D,Martin DE,Cody MM

更新日期：2000-03-01 00:00:00

abstract：PURPOSE:This study tested the hypothesis that the magnitude of cardiovascular (CV) drift and decrease in maximal oxygen uptake (V[spacing dot above]O2max) would be greater at 35 degrees C than at 22 degrees C. METHODS:The increase in HR and decrease in stroke volume (SV) between 15 and 45 min of cycling at 59.2 +/- 1....

journal_title：Medicine and science in sports and exercise

authors： Lafrenz AJ,Wingo JE,Ganio MS,Cureton KJ

更新日期：2008-06-01 00:00:00

abstract：PURPOSE:This study examined whether plasma total glutathione levels could explain the intersubject variability in the creatine kinase (CK) response to eccentric exercise. We hypothesized that the increase in plasma CK activity after eccentric exercise would be lower for individuals with low plasma total glutathione (<2...

journal_title：Medicine and science in sports and exercise

authors： Lee J,Clarkson PM

更新日期：2003-06-01 00:00:00

abstract：:The still-evolving Utah paradigm of skeletal physiology supplements former ideas about the control of postnatal bone strength and "mass" in health and disease, on earth and in orbit, and as functions of physical activities including sports. In its view, peak muscle forces on bone dominate control of the biologic mecha...

journal_title：Medicine and science in sports and exercise

authors： Frost HM

更新日期：2000-05-01 00:00:00

abstract：PURPOSE:This study was designed to determine changes in metabolic and cardiovascular risk factors following normobaric hypoxic exercise training in healthy men. METHODS:Following a randomized baseline maximal exercise test in hypoxia and/or normoxia, 34 physically active subjects were randomly assigned to either a nor...

journal_title：Medicine and science in sports and exercise

authors： Bailey DM,Davies B,Baker J

更新日期：2000-06-01 00:00:00

abstract：:Low-intensity exercise (less than or equal to 50% VO2max) has been demonstrated to produce heat acclimation (HA) in trained subjects. The purpose of this study was to determine whether shorter-duration, moderate-intensity exercise would also result in HA. Nine trained runners performed two 9-d exercise heat-stress pro...

journal_title：Medicine and science in sports and exercise

authors： Houmard JA,Costill DL,Davis JA,Mitchell JB,Pascoe DD,Robergs RA

更新日期：1990-10-01 00:00:00

abstract：PURPOSE:This study examined the relationship between age and gender with physical activity (PA) and how meeting of PA guidelines (PAGL) is related to socioeconomic status (SES) and sedentary behaviors (SB). METHODS:Data were collected from 11-, 13-, and 15-yr-old students in 32 countries participating in the Health Be...

journal_title：Medicine and science in sports and exercise

authors： Borraccino A,Lemma P,Iannotti RJ,Zambon A,Dalmasso P,Lazzeri G,Giacchi M,Cavallo F

更新日期：2009-04-01 00:00:00

abstract：PURPOSE:This study was conducted to determine the effect of high pedaling cadences on maximal cycling power output (W(max)). METHODS:Nine well-trained cyclists performed a continuous, incremental cycle-ergometer test to exhaustion (25 W increases every 3 min) either at 80, 100, or 120 rpm on three different occasions....

journal_title：Medicine and science in sports and exercise

authors： Mora-Rodriguez R,Aguado-Jimenez R

更新日期：2006-05-01 00:00:00

abstract：PURPOSE:The purpose of the present study was to examine the effect of muscle activity level on serum creatine kinase (CK) activity after high-force eccentric exercise of the elbow flexors. METHODS:Twenty-six male volunteers were randomly assigned to one of three groups for a 4-d treatment period after exercise: immobi...

journal_title：Medicine and science in sports and exercise

authors： Sayers SP,Clarkson PM,Lee J

更新日期：2000-09-01 00:00:00

abstract：:The purpose of this study was to investigate the association between elite endurance athlete (EEA) status and two restriction fragment length polymorphisms (RFLPs) at the muscle-specific creatine kinase (CKMM) gene locus. Genomic DNA was extracted from white blood cells or lymphoblastoid cell lines of 124 unrelated Ca...

journal_title：Medicine and science in sports and exercise

authors： Rivera MA,Dionne FT,Wolfarth B,Chagnon M,Simoneau JA,Pérusse L,Boulay MR,Gagnon J,Song TM,Keul J,Bouchard C

更新日期：1997-11-01 00:00:00

abstract：PURPOSE:The study's purposes were to 1) assess changes in cardiorespiratory fitness (CRF) from 1998 to 2010, controlling for decimal age and body mass index (BMI), and 2) repeat the analysis in cohorts from 2005 to 2010, controlling for maturation, deprivation, and BMI. METHODS:A total of 27,942 (n = 14,247 boys) 9- t...

journal_title：Medicine and science in sports and exercise

authors： Boddy LM,Fairclough SJ,Atkinson G,Stratton G

更新日期：2012-03-01 00:00:00

abstract：:Forty male and 40 female rats were randomly assigned to 1 of 4 experimental groups. Half of the animals of each gender were exercised by jumping (weighted by a vest with up to 70% body weight) to a height of 16 cm 20 times X d-1 (30 s between jumps) 5 d X wk-1 for 8 wk. Half of the exercised animals and half of the se...

journal_title：Medicine and science in sports and exercise

authors： Leeds EM,Wilkerson JE,Brown GD,Kamen G,Bredle D

更新日期：1986-12-01 00:00:00

abstract：PURPOSE:The chronic exposure at high altitude (HA) represents an ideal model for evaluating the in vivo effects of hypobaric hypoxia. Taking advantage of the EV-K2-CNR Pyramid, this study was designed to evaluate whether acute and chronic hypoxia differently modulates the in vivo immune responses. METHODS:The study in...

journal_title：Medicine and science in sports and exercise

authors： Facco M,Zilli C,Siviero M,Ermolao A,Travain G,Baesso I,Bonamico S,Cabrelle A,Zaccaria M,Agostini C

更新日期：2005-05-01 00:00:00

abstract：:Inappropriate cushioning and/or tractional characteristics of sports surfaces are assumed to increase surface-related injuries in various sports activities. Various tests assessing cushioning and frictional properties are currently in use to evaluate sports surfaces with respect to their potential to reduce the number...

journal_title：Medicine and science in sports and exercise

authors： Nigg BM

更新日期：1990-02-01 00:00:00

abstract：PURPOSE:For treatment of various knee disorders, muscles are trained in open or closed kinetic chain tasks. Coordination between the heads of the quadriceps muscle is important for stability and optimal joint loading for both the tibiofemoral and the patellofemoral joint. The aim of this study was to examine whether th...

journal_title：Medicine and science in sports and exercise

authors： Stensdotter AK,Hodges PW,Mellor R,Sundelin G,Häger-Ross C

更新日期：2003-12-01 00:00:00

abstract：:A primary goal of studies of successful aging is to identify the modifiable factors related to the plasticity of higher physical function; however, little is known about the relationship between habitual physical activity (especially that of lower- to moderate-intensity) and the maintenance of day-to-day functioning i...

journal_title：Medicine and science in sports and exercise

authors： DiPietro L

更新日期：1996-05-01 00:00:00

abstract：PURPOSE:To determine the relationships between moderate-to-vigorous physical activity (MVPA), vigorous physical activity (VPA), sedentary time, and obesity in children from 12 countries representing a wide range of human development. METHODS:The sample included 6539 children age 9-11 yr. Times in MVPA, VPA, and sedent...

journal_title：Medicine and science in sports and exercise

authors： Katzmarzyk PT,Barreira TV,Broyles ST,Champagne CM,Chaput JP,Fogelholm M,Hu G,Johnson WD,Kuriyan R,Kurpad A,Lambert EV,Maher C,Maia J,Matsudo V,Olds T,Onywera V,Sarmiento OL,Standage M,Tremblay MS,Tudor-Locke C,Zha

更新日期：2015-10-01 00:00:00

abstract：:The purpose of this study was to compare the rate of gastric emptying of 20 g.l-1 (2G), 40 g.l-1 (4G), and 60 g.l-1 (6G) glucose solutions with that of water (W). On separate occasions in randomized order, a 600-ml test solution was instilled into the stomach of each of six healthy male volunteers. Gastric emptying wa...

journal_title：Medicine and science in sports and exercise

authors： Vist GE,Maughan RJ

更新日期：1994-10-01 00:00:00

abstract：:This study focused on age and physical activity as determinants of muscle strength. The study involved 620 women 25-73 yr of age. The five muscle groups assessed were: grip, plantarflexors, hip abductors, trunk flexors, and trunk extensors. Pearson correlations yielded significant negative correlations of muscle stren...

journal_title：Medicine and science in sports and exercise

authors： Sandler RB,Burdett R,Zaleskiewicz M,Sprowls-Repcheck C,Harwell M

更新日期：1991-12-01 00:00:00