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 +/- 1.9% V[spacing dot above]O2max (CV drift) was measured in hot (HEAT, 35 degrees C) and cool (COOL, 22 degrees C) ambient temperatures in 10 endurance-trained men (age = 23 +/- 3 yr, V[spacing dot above]O2max = 64.7 +/- 8.7 mL.kg.min). V[spacing dot above]O2max was measured immediately after the 45 min of cycling and again under both ambient temperature conditions on separate days after 15 min of cycling. This design permitted assessment of V[spacing dot above]O2max between the same time points that CV drift occurred. Fluid to replace sweat losses was provided during all trials. RESULTS:CV drift and the associated decrease in V[spacing dot above]O2max was greater (P < 0.05) in HEAT versus COOL. HR increased 11% (P < 0.05), SV decreased 11% (P < 0.05), and V[spacing dot above]O2max fell 15% (P < 0.05) between 15 and 45 min in HEAT, whereas HR and SV changed less (+2% and -2% for HR and SV, respectively, P < 0.05), and there was no significant decrease in V[spacing dot above]O2max (5%, P > 0.05) between 15 and 45 min in COOL. CONCLUSION:These data demonstrate the magnitude of CV drift during prolonged submaximal exercise, and the accompanying decrease in V[spacing dot above]O2max measured immediately thereafter is greater in a hot than in a cool environment.
journal_name
Med Sci Sports Exercjournal_title
Medicine and science in sports and exerciseauthors
Lafrenz AJ,Wingo JE,Ganio MS,Cureton KJdoi
10.1249/MSS.0b013e3181666ed7subject
Has Abstractpub_date
2008-06-01 00:00:00pages
1065-71issue
6eissn
0195-9131issn
1530-0315journal_volume
40pub_type
杂志文章abstract：PURPOSE:Although many studies have attempted to examine the effect of hypohydration on strength, power, and high-intensity endurance, few have successfully isolated changes in total body water from other variables that alter performance (e.g., increased core temperature), and none have documented the influence of hypoh...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/mss.0b013e3180de5f22
更新日期：2007-10-01 00:00:00
abstract：UNLABELLED:Accurate assessment of physical activity (PA) is necessary to identify the sedentary older individual who is in need of activity intervention. Activity monitors are quite popular, although it has been suggested that they are less accurate at slow gait speeds. PURPOSE:To examine the accuracy of the three act...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/mss.0b013e318158b504
更新日期：2008-01-01 00:00:00
abstract：PURPOSE:The primary study aim was to evaluate associations of estimated weekly minutes of moderate-to-vigorous-intensity exercise from self-reports of the telephone-administered 7-Day Physical Activity Recall (7-Day PAR) with data captured by the RT3 triaxial accelerometer. METHODS:This investigation was undertaken as...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章,随机对照试验
doi：10.1249/MSS.0b013e3181984fa8
更新日期：2009-06-01 00:00:00
abstract：PURPOSE:To describe the mood profile of an America's Cup sailing team during competition and to evaluate the influence of previous injuries occurrence and intensity of physical work on the boat upon mood state. Relationships between mood domains and metabolic markers of muscle damage were also investigated. METHODS:A ...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e3181cd5cb9
更新日期：2010-07-01 00:00:00
abstract：:The purpose of this study was to determine the effects of different volumes of high-intensity resistance training on isometric torque and muscle thickness. Training was conducted three times per week using one set (low volume, EX-1, N = 18) or three sets (high volume, EX-3, N = 20) of dynamic variable resistance exerc...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1097/00005768-199610000-00016
更新日期：1996-10-01 00:00:00
abstract：PURPOSE:Evidence suggests that female adolescents and those living in urban environments may have lower physical activity (PA) levels compared with their peers. Yet few studies report PA for urban adolescent females, and there is no consensus regarding potential causes for low PA in this subgroup. We examined PA levels...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0000000000001152
更新日期：2017-04-01 00:00:00
abstract：PURPOSE:The prevalence of allergy and asthma symptoms and asthma medication use, which has been extensively studied in elite athletes, has received little attention in recreational roadrunners. METHODS:A validated questionnaire was used to determine the prevalence of allergy and asthma symptoms, the use of medication,...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/01.mss.0000235357.31932.43
更新日期：2006-12-01 00:00:00
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
pub_type： 杂志文章
doi：10.1249/MSS.0000000000001100
更新日期：2017-02-01 00:00:00
abstract：:The purposes of this study were to evaluate (a) the effects of step rate and upper body support on the VO2 and HR responses to fixed work rates on the StairMaster 4000 (SM), (b) the accuracy of the SM settings, and (c) how HR compared with that measured during grade-walking on a treadmill. Six subjects worked at a slo...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：
更新日期：1992-09-01 00:00:00
abstract：OBJECTIVES:To examine if the associations between motor competence and physical activity and musculoskeletal fitness change over time, whether motor competence is associated with longitudinal trajectories of physical activity and fitness, and mediating pathways among these constructs across early childhood. METHODS:Fo...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0000000000002388
更新日期：2020-11-01 00:00:00
abstract：PURPOSE:Ipratropium bromide (IB) has been used to prevent exercise-induced bronchoconstriction (EIB), but its effect varies among individuals. We hypothesized that such variability may reflect individual differences in vagal activity (VA), and therefore determined whether a correlation exists between VA and the effect ...
journal_title：Medicine and science in sports and exercise
pub_type： 临床试验,杂志文章
doi：10.1249/01.mss.0000155436.31581.90
更新日期：2005-03-01 00:00:00
abstract：PURPOSE:The study purposes were 1) to study the differences between perceived exertion measured by a generic (/10) or an individualized (/max value obtained during the test) score on the OMNI cycle scale (OMNImax and OMNI10) and the actual effort (peak oxygen consumption) at different stages of a maximal cycling test i...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e31827bd397
更新日期：2013-05-01 00:00:00
abstract：:Ingestion of fluids providing carbohydrate and electrolytes extends endurance times during prolonged exercise. To understand the contribution of these factors, we examined hormonal, physiologic, and metabolic responses to ingesting water (W) or a 7% glucose polymer/fructose/electrolyte solution (GPFE) in 10 men (age: ...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：
更新日期：1992-01-01 00:00:00
abstract：PURPOSE:High internal stress is considered to be a possible cause of heel-pad problems. External biomechanical measurements are used to attempt to understand the causes of heel pain. However, internal stress cannot be measured experimentally. Therefore, the purpose of this study was to quantify the relationship between...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：
更新日期：2005-06-01 00:00:00
abstract：:Walking is an important form of physical activity. It is practiced by people of nearly all ages, throughout the world. Walking is an integral part of life, and there is accumulating evidence that it is essential to good health. There are many ways to measure walking including pedometers, accelerometers, trail counters...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章,评审
doi：10.1249/MSS.0b013e31817c699c
更新日期：2008-07-01 00:00:00
abstract：UNLABELLED:The cumulative effect of the female athlete triad (Triad) risk factors on the likelihood of low bone mineral density (BMD) in exercising women is unclear. PURPOSE:This study aimed to determine the risk of low BMD in exercising women with multiple Triad risk factors. METHODS:We retrospectively examined cros...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e3182a03b8b
更新日期：2014-01-01 00:00:00
abstract：INTRODUCTION:It is well established that regular physical activity (PA) contributes to lower levels of morbidity and mortality. However, little is known about the stability of very young children's PA habits across seasons and years. The aims of this study were to 1) examine the influence of season and increasing age o...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e3182464db5
更新日期：2012-07-01 00:00:00
abstract：UNLABELLED:Uncoupling protein 3 (UCP3) is a mitochondrial inner membrane protein, which is hypothesized to shuttle nonmetabolized fatty acids, particularly when excessive fatty acids are present. PURPOSE:Obese Zucker rats (OZR) have systematically elevated levels of fatty acids, with decreased fatty acid metabolism. W...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e31817702a4
更新日期：2008-09-01 00:00:00
abstract：PURPOSE:To describe the influence of caffeine on physiological responses to exercise in young children and determine whether sex differences in these responses exist. METHODS:Twenty-six healthy 7- to 9-yr-old boys and 26 healthy 7- to 9-yr-old girls volunteered to participate in a double-blind, randomized, double cros...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章,随机对照试验
doi：10.1249/01.mss.0000191189.40436.73
更新日期：2006-03-01 00:00:00
abstract：:It is commonly believed that exposure to cold environmental temperatures depresses immune function and increases the risk for infection. This review paper will 1) present an overview of human physiological responses to cold exposure, 2) present the human studies examining the effects of cold exposure on immune respons...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章,评审
doi：10.1097/00005768-200212000-00023
更新日期：2002-12-01 00:00:00
abstract：PURPOSE:The influence of maximal strength, as measured by the maximal load lifted for one repetition (1RM), on power production in the initial 200 ms of the concentric phase for both rebound and nonrebound movements was investigated. We also investigated the effect of external load upon this relationship. METHODS:Twen...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1097/00005768-200010000-00016
更新日期：2000-10-01 00:00:00
abstract：PURPOSE:Splanchnic hypoperfusion is a physiological phenomenon during strenuous exercise. It has been associated with gastrointestinal symptoms and intestinal injury and may hamper athletic performance. We hypothesized that L-citrulline supplementation improves splanchnic perfusion and decreases intestinal injury by en...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章,随机对照试验
doi：10.1249/MSS.0000000000000332
更新日期：2014-11-01 00:00:00
abstract：PURPOSE:To examine serum creatine kinase (CK) activity after resistance exercise bouts with different rest intervals between sets and exercises in high responding (HR) and normal responding (NR) subjects. METHODS:During each resistance exercise bout, three sets with 10-repetition maximum (10RM) loads were completed fo...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e3181ca7e16
更新日期：2010-07-01 00:00:00
abstract：:The effects of endurance training on aerobic power, and the relationship between aerobic power and running performance were investigated in 11 junior runners over a period of 5-to-7 years, starting from the age of 14. Aerobic power was measured using treadmill running and a protocol that involved increasing speed. The...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：
更新日期：1981-01-01 00:00:00
abstract：PURPOSE:This study aimed to determine whether physical activity patterns are associated with sleep later at night and if nighttime sleep is associated with physical activity patterns the next day among adult women. METHODS:Women (N = 353) living throughout the United States wore a wrist and a hip accelerometer for 7 d...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0000000000001000
更新日期：2016-10-01 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
pub_type： 杂志文章
doi：10.1249/MSS.0b013e3181ab8cc0
更新日期：2009-12-01 00:00:00
abstract：PURPOSE:The midfoot is instrumental to foot function; however, quantifying its roles in human movement has been difficult. A forceful dynamic activity like landing may help elucidate the midfoot's contribution to foot energetics and function. The main purpose of this study was to measure midtarsal joint kinematics and ...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0000000000001765
更新日期：2019-01-01 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
pub_type： 杂志文章
doi：10.1097/00005768-200210000-00010
更新日期：2002-10-01 00:00:00
abstract：PURPOSE:The SenseWear Pro2 Armband (SWA; BodyMedia, Inc., Pittsburg, PA), the Intelligent Device for Energy Expenditure and Activity (IDEEA; Minisun LLC, Fresno, CA), and the ActiReg (AR; PreMed AS, Oslo, Norway) were compared with indirect calorimetry to determine the ability of these devices to assess energy cost in ...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e31818896f4
更新日期：2009-03-01 00:00:00
abstract：:The influence of body weight on the performance in cross-country skiing has been studied by: dimensional analysis of the ratio (R) between the factors of importance to power production (VO2max, acceleration of gravity) and the braking powers, e.g., friction and air resistance; measuring the energy cost of level skiing...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：
更新日期：1987-08-01 00:00:00
