Effects of caffeine on physiological responses to exercise in young boys and girls.

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：:Ten experienced weight lifters were studied to determine the influence of strenuous, free-weight, squat lift exercise on changes in plasma volume, mean arterial pressure, and the rate pressure product. After a 40-min postural adjustment prior to upright exercise, each subject completed eight sets of eight repetitions ...

journal_title：Medicine and science in sports and exercise

authors： Knowlton RG,Hetzler RK,Kaminsky LA,Morrison JJ

更新日期：1987-10-01 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：: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：OBJECTIVE:This study investigated the contributions of physical fitness and body composition to 24-h fat oxidation in adults under sedentary conditions in a whole-room calorimeter. METHODS:The following measurements were studied in 109 adults (49 male/45 female) at least 36 h after a bout of exercise: 1) aerobic fitne...

journal_title：Medicine and science in sports and exercise

authors： Kriketos AD,Sharp TA,Seagle HM,Peters JC,Hill JO

更新日期：2000-04-01 00:00:00

abstract：:Participation in sports in on the increase; this article addresses the intersection of sports and infectious diseases. Some infections occur with increased incidence in sports; others have an increased impact in that setting. Addressed in this article are issues of diagnosis, prevention, and management of many of thes...

journal_title：Medicine and science in sports and exercise

authors： Beck CK

更新日期：2000-07-01 00:00:00

abstract：PURPOSE:Exercise improves the diagnostic performance of ankle-to-brachial index (ABI) in the detection of exercise-induced arterial endofibrosis (EIAE). Pressure values for all four limbs are required to calculate ABI, but rapid systemic pressure changes occur during the recovery period from exercise. We checked whethe...

journal_title：Medicine and science in sports and exercise

authors： Le Faucheur A,Noury-Desvaux B,Jaquinandi V,Louis Saumet J,Abraham P

更新日期：2006-11-01 00:00:00

abstract：:The objective of this study was to investigate the effects of shoes and foot orthotics on running economy and selected frontal plane knee kinematics during the support phase of running. Twenty-one male runners who had been fitted with orthotics served as subjects. Subjects participated in three submaximal runs on a tr...

journal_title：Medicine and science in sports and exercise

authors： Burkett LN,Kohrt WM,Buchbinder R

更新日期：1985-02-01 00:00:00

abstract：:To investigate the possible role of elastic potentiation on mechanical efficiency, three male marathon runners were filmed while running on a treadmill at various steady-state speeds ranging from 7.0-22.0 km X h-1. Kinematic and mechanical energy analyses were performed from the film. Expired air was collected for ene...

journal_title：Medicine and science in sports and exercise

authors： Ito A,Komi PV,Sjödin B,Bosco C,Karlsson J

更新日期：1983-01-01 00:00:00

abstract：PURPOSE:Tibial stress fracture is a common overuse running injury that results from the interplay of repetitive mechanical loading and bone strength. This research project aimed to determine whether female runners with a history of tibial stress fracture (TSF) differ in ground reaction force (GRF) parameters during run...

journal_title：Medicine and science in sports and exercise

authors： Bennell K,Crossley K,Jayarajan J,Walton E,Warden S,Kiss ZS,Wrigley T

更新日期：2004-03-01 00:00:00

abstract：PURPOSE:Despite the growing research interest in vascular adaptations to exercise training over the last few decades, it remains unclear whether microvascular function in healthy subjects can be further improved by regular training. Herein, we sought to systematically review the literature and determine whether microva...

journal_title：Medicine and science in sports and exercise

authors： Montero D,Walther G,Diaz-Cañestro C,Pyke KE,Padilla J

更新日期：2015-07-01 00:00:00

abstract：:The close balance between the O2 requirement to perform exercise and the O2 supply was analyzed. A non-uniform capillary PO2 can result in anaerobic metabolism in some muscle fibers despite an apparently adequate mean capillary PO2. The pattern of lactate increase for constant work rates and incremental exercise is de...

journal_title：Medicine and science in sports and exercise

authors： Wasserman K,Beaver WL,Whipp BJ

更新日期：1986-06-01 00:00:00

abstract：PURPOSE:Accurate and reliable measurement of physical activity plays an important role in assessing effective lifestyle interventions for obesity. This study examined reliability of accelerometer-based estimates of physical activity levels of overweight and obese adults before and after a lifestyle weight loss program....

journal_title：Medicine and science in sports and exercise

authors： Jerome GJ,Young DR,Laferriere D,Chen C,Vollmer WM

更新日期：2009-01-01 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：PURPOSE:This study aimed to investigate atrophy in the deep abdominal muscles, spinal extensors, and the effect of high-load resistive exercise with and without whole-body vibration after 60 d of strict bed rest. METHODS:Twenty-four subjects underwent 60 d of head-down tilt bed rest and performed either resistive vibr...

journal_title：Medicine and science in sports and exercise

authors： Belavý DL,Gast U,Felsenberg D

更新日期：2017-02-01 00:00:00

abstract：UNLABELLED:Hiking is a recreational activity shown to offer significant positive effects on the human body. However, walking downhill and external load carriage have both been shown to increase the risk of musculoskeletal pain and injury. The use of hiking poles has been demonstrated to be successful in reducing forces...

journal_title：Medicine and science in sports and exercise

authors： Bohne M,Abendroth-Smith J

更新日期：2007-01-01 00:00:00

abstract：UNLABELLED:Theoretically, critical torque (CT) is the maximal isometric torque that can be maintained without fatigue, and anaerobic work capacity (AWC) is the total "isometric work" associated with stored energy sources within the muscle. PURPOSE:The purpose of this study was twofold: 1) to determine whether there we...

journal_title：Medicine and science in sports and exercise

authors： Hendrix CR,Housh TJ,Mielke M,Zuniga JM,Camic CL,Johnson GO,Schmidt RJ

更新日期：2009-12-01 00:00:00

abstract：PURPOSE AND METHODS:The isovolumic contractile responsiveness of left ventricular (LV) myocardium to altered extracellular [Ca2+], [Na+], and pacing frequency was examined using perfused hearts (37 degrees C) isolated from sedentary (SED) and treadmill-trained (TR) adult female rats. RESULTS:The suppressive effect of ...

journal_title：Medicine and science in sports and exercise

authors： Lankford EB,Korzick DH,Palmer BM,Stauffer BL,Cheung JY,Moore RL

更新日期：1998-10-01 00:00:00

abstract：PURPOSE:The aim was to determine the feasibility of a 6-wk speed-based exercise program that could be used to initiate new exercise behaviors and to improve rapid movement in older adults approaching frailty. METHODS:The intervention group included 14 older adults (3 males and 11 females; mean ± SD, age = 70 ± 7.6 yr,...

journal_title：Medicine and science in sports and exercise

authors： Bellumori M,Uygur M,Knight CA

更新日期：2017-01-01 00:00:00

abstract：PURPOSE:The purpose of this study was to examine the impact of exercise-induced metabolic stress on hormonal responses and chronic muscular adaptations. METHODS:We compared the acute and long-term effects of an "NR regimen" (no-rest regimen) and those of a "WR regimen" (regimen with rest period within a set). Twenty-s...

journal_title：Medicine and science in sports and exercise

authors： Goto K,Ishii N,Kizuka T,Takamatsu K

更新日期：2005-06-01 00:00:00

abstract：UNLABELLED:Considerable evidence suggests regular physical activity can reduce chronic pain symptoms. The dysfunction of endogenous facilitatory and inhibitory systems has been implicated in multiple chronic pain conditions. However, few studies have investigated the relationship between levels of physical activity and...

journal_title：Medicine and science in sports and exercise

authors： Naugle KM,Riley JL 3rd

更新日期：2014-03-01 00:00:00

abstract：PURPOSE:The purpose of this study is to compare the time-frequency characteristic, using nonlinearly scaled wavelets, of the EMG signal as well as the three-dimensional (3D) knee kinematics of female and male elite soccer players performing an unanticipated cutting maneuver. METHODS:Fifteen female and 15 male elite so...

journal_title：Medicine and science in sports and exercise

authors： Beaulieu ML,Lamontagne M,Xu L

更新日期：2008-10-01 00:00:00

abstract：INTRODUCTION:Dementia caregivers have an increased risk of cardiovascular disease, and it is possible that metabolic disturbances contribute to this risk. Regular physical exercise reduces cardiometabolic risk, but caregivers may have less opportunity to engage in such activity. We hypothesized that regular physical ac...

journal_title：Medicine and science in sports and exercise

authors： von Känel R,Mausbach BT,Dimsdale JE,Mills PJ,Patterson TL,Ancoli-Israel S,Ziegler MG,Roepke SK,Harmell AL,Allison M,Grant I

更新日期：2011-01-01 00:00:00

abstract：PURPOSE:We examined bilateral bone mineral density (BMD) in the arms of female college gymnasts to assess the relative contribution of high-impact loading forces versus daily activities on bone plasticity. METHODS:Twenty-five female collegiate gymnasts and 25 controls were studied. BMD of the lumbar spine, proximal fe...

journal_title：Medicine and science in sports and exercise

authors： Proctor KL,Adams WC,Shaffrath JD,Van Loan MD

更新日期：2002-11-01 00:00:00

abstract：:A decrease in hepatic lactate dehydrogenase (LDH) activity following endurance training has been a consistent observation. In the present study, we sought to determine whether the training-induced decrease in hepatic LDH activity (pyruvate = substrate) was associated with a shift in the isoenzyme profile and/or altera...

journal_title：Medicine and science in sports and exercise

authors： Sumida KD,Frisch F,Donovan CM

更新日期：1995-04-01 00:00:00

abstract：:The papers in this supplement to Medicine and Science in Sports and Exercise seek to summarize our knowledge of the dose-response relationship of exercise with a variety of health outcomes. This type of rigorous evidence summation has become quite popular in the past 10 years as health care providers and policymakers ...

journal_title：Medicine and science in sports and exercise

authors： Schriger DL

更新日期：2001-06-01 00:00:00

abstract：PURPOSE:During and following exercise there are a number of changes in pulmonary function, among which is a decrease in forced vital capacity (FVC). Several potential mechanisms may explain this decreased FVC, including an exercise-induced increase in thoracic blood volume. METHODS:We tested the hypothesis that altere...

journal_title：Medicine and science in sports and exercise

authors： Coast JR,O'Kroy JA,Akers FM 2nd,Dahl T

更新日期：1998-07-01 00:00:00

abstract：:The influence of anthropometry and body composition on running economy is unclear, with previous investigations involving small relatively homogeneous groups of runners and limited anthropometric/composition measurements. PURPOSE:To comprehensively investigate the relationships of anthropometry and body composition w...

journal_title：Medicine and science in sports and exercise

authors： Black MI,Allen SJ,Forrester SE,Folland JP

更新日期：2020-03-01 00:00:00

abstract：INTRODUCTION:Arterialization of venous gas emboli (VGE) formed after surfacing from SCUBA diving can become arterial gas emboli (AGE) through intrapulmonary arterial-venous anastomoses that open with exercise. METHODS:We recruited twenty patent foramen ovale-negative SCUBA divers and conducted a field and a laboratory...

journal_title：Medicine and science in sports and exercise

authors： Barak OF,Madden D,Lovering AT,Lambrechts K,Ljubkovic M,Dujic Z

更新日期：2015-09-01 00:00:00

abstract：PURPOSE:To examine 1) relationships between adult PA at 35 yr and PA as a child, and 2) the influence of enhanced primary school physical education (physed+) and of parental PA upon the long-term tracking of PA in the offspring. METHODS:PA data from the 1970-1977 Trois-Rivieres Growth and Development Study, completed ...

journal_title：Medicine and science in sports and exercise

authors： Trudeau F,Laurencelle L,Shephard RJ

更新日期：2004-11-01 00:00:00