Abstract:
:A previous study has shown that subjects who entrain breathing during cycling exhibit a lower oxygen consumption (VO2) compared with random breathing. We sought to investigate the hypothesis that entrainment of breathing during rowing improved biomechanical economy (reduced VO2) compared with spontaneous breathing. A secondary hypothesis was that perceptual ratings of breathing difficulty would be lower with entrained breathing. Sixteen physically active male subjects (mean +/- SD age: 21 +/- 5 yr) with no previous rowing experience received instruction in rowing and then performed progressive incremental exercise on the variable-resistance rowing ergometer (Concept II, Morrisville, VT). Peak VO2 was 53.1 +/- 5.4 ml.kg-1.min-1. At three subsequent visits subjects rowed at power productions of 50% and 75% of peak VO2 for 6 min each. At each visit they were randomized to a specific pattern of breathing: inspire during drive, expire during recovery; expire during drive, inspire during recovery; or spontaneous breathing. At the end of each session subjects rated "breathing difficulty" using the 0-10 category-ratio scale. Analysis of variance revealed no significant differences in VO2, VO2/power production, or perceptual ratings at either intensity of exercise for the three different breathing patterns. Although our results do not support either the primary or secondary hypothesis, it is possible that any physiologic and/or perceptual benefits of locomotor-respiratory coupling might be specific for exercise mode or might require months to years of training.
journal_name
Med Sci Sports Exercjournal_title
Medicine and science in sports and exerciseauthors
Maclennan SE,Silvestri GA,Ward J,Mahler DAsubject
Has Abstractpub_date
1994-05-01 00:00:00pages
610-4issue
5eissn
0195-9131issn
1530-0315journal_volume
26pub_type
临床试验,杂志文章,随机对照试验abstract:PURPOSE:The purpose of the study was to explore the utility of school- and county-level variables in explaining variability in children and adolescent body mass index (BMI). METHODS:BMI data from nearly 2.5 million of children and adolescents were aggregated at the school level from more than 5000 schools in Texas. Sc...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000001311
更新日期:2017-09-01 00:00:00
abstract:PURPOSE:Previous studies have suggested that higher levels of physical activity may lower lung cancer risk; however, few prospective studies have evaluated lung cancer mortality in relation to cardiorespiratory fitness (CRF), an objective marker of recent physical activity habits. METHODS:Thirty-eight thousand men, ag...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e3181c47b65
更新日期:2010-05-01 00:00:00
abstract::The reproducibility of the Bruce exercise test protocol for the determination of maximal aerobic activity was evaluated in sedentary older women. Seventeen women between the ages of 51 and 68 yr performed five maximal graded exercise tests to volitional fatigue on a treadmill. VO2max (mL.kg-1.min-1) values averaged 27...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-199708000-00018
更新日期:1997-08-01 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:PURPOSE:The aim of this study was to test the hypothesis that intermittent hypoxic interval training improves sea level cycling performance more than equivalent training in hypoxia or normoxia. METHODS:Thirty-three well-trained cyclists and triathletes (25.9 +/- 2.7 yr, VO(2max) 66.1 +/- 6.1 mL.min(-1).kg(-1)) were di...
journal_title:Medicine and science in sports and exercise
pub_type: 临床试验,杂志文章
doi:10.1249/01.mss.0000150077.30672.88
更新日期:2005-01-01 00:00:00
abstract:PURPOSE:We investigated technical and physiological responses along with their relationships during an incremental field test to exhaustion specific to tennis (TEST) in elite players. METHODS:Twenty male elite tennis players completed TEST, which consisted of hitting alternatively forehand and backhand strokes at incr...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000001303
更新日期:2017-09-01 00:00:00
abstract:PURPOSE:Cardiac aldosterone might be involved in the deleterious effects of nandrolone decanoate (ND) on the heart. Therefore, we investigated the involvement of cardiac aldosterone, by the pharmacological block of AT1 or mineralocorticoid receptors, on cardiac hypertrophy and fibrosis. METHODS:Male Wistar rats were r...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e318217e8b6
更新日期:2011-10-01 00:00:00
abstract:INTRODUCTION:Regular exercise can reduce the risk of developing cardiovascular disease through risk factor modification, with high-intensity exercise and more recently small muscle mass training providing alternatives to moderate-intensity exercise. METHODS:This study randomly assigned 53 healthy middle-age adults (ag...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1249/MSS.0000000000002053
更新日期:2019-11-01 00:00:00
abstract:PURPOSE:Greater resistance to muscle fatigue has been observed in women versus men and in older versus young individuals. As suggested mechanisms for these differences include task intensity and duty cycle, the purpose of this study was to evaluate fatigue in healthy young and older men and women during maximum-effort ...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/mss.0b013e31815bbb93
更新日期:2008-02-01 00:00:00
abstract:INTRODUCTION:Physical endurance can be limited by muscle glycogen stores, in that glycogen depletion markedly reduces external work. During carbohydrate restriction, the liver synthesizes the ketone bodies, D-β-hydroxybutyrate, and acetoacetate from fatty acids. In animals and in the presence of glucose, D-β-hydroxybut...
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.0000000000001292
更新日期:2017-09-01 00:00:00
abstract:PURPOSE:Cardiopulmonary exercise testing (CPX) provides valuable clinical information, including peak ventilation (V˙Epeak), which has been shown to have diagnostic and prognostic value in the assessment of patients with underlying pulmonary disease. This report provides reference standards for V˙Epeak derived from CPX...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000001740
更新日期:2018-12-01 00:00:00
abstract:INTRODUCTION:Competitive female athletes restrict energy intake and increase exercise energy expenditure frequently resulting in ovarian suppression. The purpose of this study was to determine the impact of ovarian suppression and energy deficit on swimming performance (400-m swim velocity). METHODS:Menstrual status w...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e3182a32b72
更新日期:2014-01-01 00:00:00
abstract::This paper introduces the terminology and application of parameter estimation techniques for clarifying models of pulmonary gas-exchange control dynamics. Results are given of modeled first-order systems, and the extension of such models to higher orders is discussed with examples. It is emphasized that justification ...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1990-02-01 00:00:00
abstract::The effects of supervised physical training (PT) and lifestyle education (LSE) on risk factors for coronary artery disease and non-insulin-dependent diabetes mellitus were compared in obese 7- to 11-yr-old black girls. The subjects were divided into two groups. The PT group (N = 12) completed a 5-d.wk-1, 10-wk, aerobi...
journal_title:Medicine and science in sports and exercise
pub_type: 临床试验,杂志文章
doi:10.1097/00005768-199601000-00009
更新日期:1996-01-01 00:00:00
abstract:INTRODUCTION:We examined the relationships between insulin-like growth factor I (IGF-I), its binding protein (IGFBP-3), body composition, and bone mineral density (BMD) in collegiate runners (N = 13), gymnasts (N = 10), and noncompetitive women (N = 10). METHODS:Subjects were evaluated by dual-energy x-ray absorptiome...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200011000-00013
更新日期:2000-11-01 00:00:00
abstract:UNLABELLED:Migrating birds have been able to sustain an energy expenditure (EE) that is five times their basal metabolic rate. Although humans can readily reach these levels, it is not yet clear what levels can be sustained for several days. PURPOSE:The study's purposes were 1) to determine the upper limits of human E...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,meta分析,评审
doi:10.1249/MSS.0b013e31822430ed
更新日期:2011-12-01 00:00:00
abstract::The purpose of this study was to determine whether competitive and recreational runners would replicate land training intensity during water immersion (WI) running with (V) and without (NV) a flotation vest and during treadmill running (Tm). Seven female competitive runners (CR) and seven female noncompetitive runners...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-199710000-00015
更新日期:1997-10-01 00:00:00
abstract::Acute aerobic exercise improves mood and activates the endocannabinoid (eCB) system in physically active individuals; however, both mood and eCB responses to exercise may vary based on habitual levels of physical activity. PURPOSE:This study aimed to examine eCB and mood responses to prescribed and preferred exercise...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000001276
更新日期:2017-08-01 00:00:00
abstract:PURPOSE:To develop a protocol for isolating changes in aerodynamic and rolling resistances from field-based measures of power and velocity during level bicycling. METHODS:We assessed the effect of body position (hands on brake hoods vs drops) and tire pressure changes (414 vs 828 kPa) on aerodynamic and rolling resist...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e3181fcb140
更新日期:2011-05-01 00:00:00
abstract:PURPOSE:There is evidence that carbohydrate (CHO) mouth rinsing can improve endurance exercise performance as well as muscle force production and sprint performance. Whether the oral administration of non-CHO tastants also affects exercise performance is not known. The purpose of this study was to investigate whether m...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000000271
更新日期:2014-08-01 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
pub_type: 临床试验,杂志文章
doi:10.1097/00005768-200006000-00004
更新日期:2000-06-01 00:00:00
abstract:PURPOSE:To examine the relationship between physical activity and levels of plasma lipid peroxides, superoxide dismutase in erythrocytes (SOD), and glutathione peroxidase (GSH-Px) in whole blood activities. METHODS:Cross-sectional study in 488 Spanish women. Two categories of leisure time physical activity were define...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200205000-00014
更新日期:2002-05-01 00:00:00
abstract:PURPOSE:Lateral knee osteoarthritis (OA) is common after anterior cruciate ligament reconstruction (ACLR), yet gait characteristics associated with lateral knee OA after ACLR are not well understood. This cross-sectional study aimed to compare knee, trunk, pelvis, hip, and ankle kinematics and moments between people wi...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000000671
更新日期:2015-11-01 00:00:00
abstract:INTRODUCTION & PURPOSE:Obesity-related increases of weight on the chest wall are known to decrease lung volume and chest wall compliance, but the effect of this mass loading, independent of other obesity-related complications on the ventilatory response to exercise is unknown. The purpose of this study was to investiga...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.mss.0000126386.12402.f5
更新日期:2004-05-01 00:00:00
abstract:PURPOSE:Aerobic training of professional road cyclists is linked to tremendous aerobic capacities that have never been clearly related to what occur in skeletal muscles submitted to a specific exercise. The aim of the present study was to examine specifically metabolic recovery after an incremental cycling exercise per...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.mss.0000162616.20085.b4
更新日期:2005-05-01 00:00:00
abstract:UNLABELLED:Environmental heat stress degrades aerobic performance; however, little research has focused on performance when the selected task elicits modest elevations in core body temperature (<38.5 degrees C). PURPOSE:To determine the effect of environmental heat stress, with modest hyperthermia, on aerobic performa...
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.0b013e3181adb9fb
更新日期:2010-01-01 00:00:00
abstract:INTRODUCTION:Low lean mass (LM) is a risk factor for chronic disease, a major cause of disability and diminished quality of life, and is a heritable trait. However, relatively few specific genetic factors have been identified as potentially influencing this trait. METHODS:In this study, we selected 1493 single-nucleot...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000000889
更新日期:2016-07-01 00:00:00
abstract:PURPOSE:It has been well established in mammals that circadian behavior as well as the molecular clockwork can be synchronized to the light-dark cycle via the suprachiasmatic nucleus of the hypothalamus (SCN). In addition to light, it has been demonstrated that nonphotic time cues, such as restricting the time of food ...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e318255cf4c
更新日期:2012-09-01 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
pub_type: 杂志文章
doi:10.1249/01.MSS.0000069553.47739.36
更新日期:2003-06-01 00:00:00
abstract:INTRODUCTION:Unilateral elbow pain results in sensorimotor dysfunction that is frequently bilateral, affects local and remote upper limb muscles, and persists beyond resolution of local tendon symptoms. These characteristics suggest supraspinal involvement. Here, we investigated 1) the excitability and organization of ...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000000469
更新日期:2015-04-01 00:00:00