Resistance training during unweighting maintains muscle size and function in human calf.

abstract：PURPOSE:The objective of this study was to quantify age-related changes in accelerometer-derived day-level physical activity and sedentary behavior pattern metrics (i.e., number, length, and temporal dispersion of bouts and breaks) across 3 yr of middle childhood. Differences by child sex and weekend versus weekday wer...

journal_title：Medicine and science in sports and exercise

authors： Dunton GF,Yang CH,Zink J,Dzubur E,Belcher BR

更新日期：2020-06-01 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：:Machine learning classification models for accelerometer data are potentially more accurate methods to measure physical activity in young children than traditional cut point methods. However, existing algorithms have been trained on laboratory-based activity trials, and their performance has not been investigated unde...

journal_title：Medicine and science in sports and exercise

authors： Ahmadi MN,Brookes D,Chowdhury A,Pavey T,Trost SG

更新日期：2020-05-01 00:00:00

abstract：PURPOSE:The aim of this study was to investigate and improve the accuracy of accelerometer-type pedometers used by the elderly with slow walking speeds, with or without gait disorders, who do or do not use a cane. METHODS:Eighteen subjects walked with a cane (5 males, 13 females; age, 80.9 +/- 7.7 yr; height, 148.1 +/...

journal_title：Medicine and science in sports and exercise

authors： Ichinoseki-Sekine N,Kuwae Y,Higashi Y,Fujimoto T,Sekine M,Tamura T

更新日期：2006-09-01 00:00:00

abstract：BACKGROUND:The Sedentary Sphere is a method for the analysis, identification, and visual presentation of sedentary behaviors from a wrist-worn triaxial accelerometer. PURPOSE:This study aimed to introduce the concept of the Sedentary Sphere and to determine the accuracy of posture classification from wrist acceleromet...

journal_title：Medicine and science in sports and exercise

authors： Rowlands AV,Olds TS,Hillsdon M,Pulsford R,Hurst TL,Eston RG,Gomersall SR,Johnston K,Langford J

更新日期：2014-06-01 00:00:00

abstract：PURPOSE:A decision tree based on a clinico-physiological score (SHAI score) has been developed to detect subjects susceptible to Severe High Altitude Illness (SHAI). We aimed to validate this decision tree, to rationalize the prescription of acetazolamide (ACZ) and to specify the rule for a progressive acclimatization....

journal_title：Medicine and science in sports and exercise

authors： Richalet JP,Pillard F,Le Moal D,Rivière D,Oriol P,Poussel M,Chenuel B,Doutreleau S,Vergès S,Demanez S,Vergnion M,Boulet JM,Douard H,Dupré M,Mesland O,Remetter R,Lonsdorfer-Wolf E,Frey A,Vilcoq L,Jaffuel AN,Debeaum

更新日期：2020-12-29 00:00:00

abstract：:In "normal" conditions (e.g., normoxia, absence of pathological conditions) convective and diffusive O(2) delivery to skeletal muscle fibers do not seem to represent important determinants for the kinetics of adjustment of oxidative phosphorylation following increases in metabolic demand. Whereas a limiting role by PD...

journal_title：Medicine and science in sports and exercise

authors： Grassi B

更新日期：2005-09-01 00:00:00

abstract：PURPOSE:Light-intensity physical activity (LIPA) accounts for much of adults' waking hours (≈40%) and substantially contributes to overall daily energy expenditure. Encompassing activity behaviors of low intensity (standing with little movement) to those of higher intensity (slow walking), LIPA is ubiquitous, yet littl...

journal_title：Medicine and science in sports and exercise

authors： Howard B,Winkler EA,Sethi P,Carson V,Ridgers ND,Salmon JO,Healy GN,Owen N,Dunstan DW

更新日期：2015-10-01 00:00:00

abstract：PURPOSE:To test for relationships between objectively measured habitual physical activity and fundamental movement skills in a relatively large and representative sample of preschool children. METHODS:Physical activity was measured over 6 d using the Computer Science and Applications (CSA) accelerometer in 394 boys an...

journal_title：Medicine and science in sports and exercise

authors： Fisher A,Reilly JJ,Kelly LA,Montgomery C,Williamson A,Paton JY,Grant S

更新日期：2005-04-01 00:00:00

abstract：PURPOSE:This study examined the direct, moderating, and indirect effects of dispositional optimism on the prediction of, and athletes' responses to, injury. METHODS:A 2-yr longitudinal design was conducted with a baseline sample of 694 asymptomatic participants (389 men, 305 women; mean ± SD age = 19.17 ± 1.69 yr), 10...

journal_title：Medicine and science in sports and exercise

authors： Wadey R,Evans L,Hanton S,Neil R

更新日期：2013-02-01 00:00:00

abstract：:Parasympathetic receptor blockade and the heart rate performance curve. Med. Sci Sports Sci., Vol. 30. No. 2, pp. 229-233, 1998. The aim of the present study was to investigate the influence of parasympathetic receptor blockade on the heart rate performance curve (HRPC). Twenty healthy male subjects performed a first ...

journal_title：Medicine and science in sports and exercise

authors： Pokan R,Hofmann P,Von Duvillard SP,Schumacher M,Gasser R,Zweiker R,Fruhwald FM,Eber B,Smekal G,Bachl N,Schmid P

更新日期：1998-02-01 00:00:00

abstract：PURPOSE:To examine whether components of body composition (size, fat mass, and fat-free mass) were related to physical activity. METHODS:A random sample of 60 eligible sixth grade girls at each of 36 schools (six schools per region and six regions in total sample); complete measurements on 1,553 girls. Physical activi...

journal_title：Medicine and science in sports and exercise

authors： Lohman TG,Ring K,Schmitz KH,Treuth MS,Loftin M,Yang S,Sothern M,Going S

更新日期：2006-06-01 00:00:00

abstract：PURPOSE:Increasing step rate has been shown to elicit changes in joint kinematics and kinetics during running, and it has been suggested as a possible rehabilitation strategy for runners with patellofemoral pain. The purpose of this study was to determine how altering step rate affects internal muscle forces and patell...

journal_title：Medicine and science in sports and exercise

authors： Lenhart RL,Thelen DG,Wille CM,Chumanov ES,Heiderscheit BC

更新日期：2014-03-01 00:00:00

abstract：PURPOSE:The reliability of athletes to recall and self-report a concussion history has never been quantified. This study examined the reliability of the self-report concussion history measure and explored determinants of recall in the number of self-reported concussions in a group of retired professional football playe...

journal_title：Medicine and science in sports and exercise

authors： Kerr ZY,Marshall SW,Guskiewicz KM

更新日期：2012-03-01 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 examines heavy episodic alcohol consumption and associated harms in collegiate athletes in the United States. The factors which may promote or deter such use are explored. METHODS:Randomly selected students in a nationally representative sample of 4-yr colleges in the United States completed self-re...

journal_title：Medicine and science in sports and exercise

authors： Nelson TF,Wechsler H

更新日期：2001-01-01 00:00:00

abstract：PURPOSE:To test our hypothesis that differences in urinary calcium excretion among blacks and whites may be secondary to ethnic variations in acid (H(+)) metabolism and to prove that increases in titratable acid excretion would be found among individuals predisposed to the development of stress fractures. METHODS:We a...

journal_title：Medicine and science in sports and exercise

authors： Vaitkevicius H,Witt R,Maasdam M,Walters K,Gould M,Mackenzie S,Farrow S,Lockette W

更新日期：2002-02-01 00:00:00

abstract：INTRODUCTION:This study examined the effect of endurance exercise on dendritic arborization in the dentate gyrus subregion in rodents exposed to a predator scent stress (PSS). METHODS:Sprague-Dawley rats were randomly assigned to one of four treatment groups. In two of the groups, rats were unexposed to PSS but either...

journal_title：Medicine and science in sports and exercise

authors： Hoffman JR,Cohen H,Ostfeld I,Kaplan Z,Zohar J,Cohen H

更新日期：2016-12-01 00:00:00

abstract：PURPOSE:Investigate development of specific performance adaptions and hormonal responses every fourth week during a 12-wk high-intensity training (HIT) period in groups with different interval-training prescriptions. METHODS:Sixty-three well-trained cyclists performing a 12-wk intervention consisting of two to three H...

journal_title：Medicine and science in sports and exercise

authors： Sylta Ø,Tønnessen E,Sandbakk Ø,Hammarström D,Danielsen J,Skovereng K,Rønnestad BR,Seiler S

更新日期：2017-06-01 00:00:00

abstract：:The individual anaerobic threshold (IAT) is the highest metabolic rate at which blood lactate (LA) concentrations are maintained at a steady state during prolonged exercise. The purpose of this study was to compare the effects of active and passive recovery on the determination of the IAT before and after an endurance...

journal_title：Medicine and science in sports and exercise

authors： McLellan TM,Jacobs I

更新日期：1989-10-01 00:00:00

abstract：PURPOSE:High-throughput profiling of metabolic status (metabolomics) allows for the assessment of small-molecule metabolites that may participate in exercise-induced biochemical pathways and corresponding cardiometabolic risk modification. We sought to describe the changes in a diverse set of plasma metabolite profiles...

journal_title：Medicine and science in sports and exercise

authors： Brennan AM,Benson M,Morningstar J,Herzig M,Robbins J,Gerszten RE,Ross R

更新日期：2018-07-01 00:00:00

abstract：PURPOSE:The purpose of this study was to examine the relative association of physical activity, cardiorespiratory fitness (CRF), and adiposity with C-reactive protein (CRP) in prepubescent children. METHODS:Forty-five prepubescent children (age = 9.4 ± 1.6 yr; 26 boys) were assessed for adiposity (percent fat) via dua...

journal_title：Medicine and science in sports and exercise

authors： Parrett AL,Valentine RJ,Arngrímsson SA,Castelli DM,Evans EM

更新日期：2010-11-01 00:00:00

abstract：PURPOSE:Reducing ice friction was one of the motives for developing the klapskate. However, the magnitude of power dissipation that occurs with conventional skates when a skater plantar flexes his ankle and the tip of the blade is pressed into the ice has not been quantified previously. In this study, we examine how ic...

journal_title：Medicine and science in sports and exercise

authors： Houdijk H,Wijker AJ,De Koning JJ,Bobbert MF,De Groot G

更新日期：2001-03-01 00:00:00

abstract：:Anaerobic ATP production in skeletal muscle and the accumulated oxygen deficit (O2D) incurred during an exhaustive cycle bout (duration = 173 +/- 24 s; intensity = 112 +/- 3% VO2peak), were determined in 10 male cyclists (mean +/- SD: VO2peak = 69.8 +/- 4.2 ml.kg-1.min-1). Anaerobic ATP production (mmol.kg-1 d.w.) was...

journal_title：Medicine and science in sports and exercise

authors： Green S,Dawson BT,Goodman C,Carey MF

更新日期：1996-03-01 00:00:00

abstract：:The degree of parasympathetic control of resting heart rate (PC) was assessed by measurement of variation in heart period (VHP) during cardiopulmonary synchronization of respiration. Respiratory period was arbitrarily preset and standardized at 7 heart beats (3 beats inspiration, 4 beats expiration). The mathematical ...

journal_title：Medicine and science in sports and exercise

authors： Kenney WL

更新日期：1985-08-01 00:00:00

abstract：PURPOSE:Trunk control is essential in ballet and may be compromised in dancers with a history of low back pain (LBP) by associated changes in motor control. This study aimed to compare trunk mechanical properties between professional ballet dancers with and without a history of LBP. As a secondary aim, we assessed whet...

journal_title：Medicine and science in sports and exercise

authors： Gildea JE,VAN DEN Hoorn W,Hides JA,Hodges PW

更新日期：2015-08-01 00:00:00

abstract：PURPOSE:In this study, we examined the effects of body position (from deep to high position) in slide boarding by well-trained cross-country skiers. The main hypothesis was that a deeper, more "crouched" position would lead to reduced air resistance and enhanced power production during explosive extension of the lower ...

journal_title：Medicine and science in sports and exercise

authors： Leirdal S,Saetran L,Roeleveld K,Vereijken B,Bråten S,Løset S,Holtermann A,Ettema G

更新日期：2006-08-01 00:00:00

abstract：:Endocrine effects of self-administration of high doses of anabolic steroids and testosterone were investigated in five power athletes during 26 wk of training, and for the following 12-16 wk after drug withdrawal. After 26 wk of anabolic steroid and testosterone administration, serum testosterone concentrations had in...

journal_title：Medicine and science in sports and exercise

authors： Alén M,Reinilä M,Vihko R

更新日期：1985-06-01 00:00:00

abstract：PURPOSE:According to the force-velocity relationship of human skeletal muscle, the maximal load one can lift is limited by the concentric movement phase, and the eccentric phase is always underloaded. In the present study, we hypothesized that acute exercise training using an eccentric overload compared with standard l...

journal_title：Medicine and science in sports and exercise

authors： Hortobágyi T,Devita P,Money J,Barrier J

更新日期：2001-07-01 00:00:00

abstract：PURPOSE:This study evaluated the factorial validity of a self-report measure of concussion-related symptom severity among a large sample of male, high-school athletes. METHODS:Participants (N = 1089) were nonconcussed, male, high-school football players. All participants completed a single baseline self-report measure...

journal_title：Medicine and science in sports and exercise

authors： Piland SG,Motl RW,Guskiewicz KM,McCrea M,Ferrara MS

更新日期：2006-01-01 00:00:00