Abstract：
INTRODUCTION/PURPOSE:Cycling is associated with a reproducible systolic anterograde and diastolic retrograde flow pattern in the brachial artery (BA) of the inactive upper limb, which results in endothelial nitric oxide (NO) release. The purpose of this study was to examine the impact of different types and intensities of lower limb exercise on the BA flow pattern. METHODS:We examined BA blood flow and shear rate patterns during cycling, leg kicking, and walking exercise in 12 young subjects (24 +/- 3 yr). BA diameter, blood flow, and shear rate were assessed at baseline (1 min) and at three incremental intensity levels of cycling (60, 80, and 120 W), bilateral leg kicking (5, 7.5, and 10 kg), and walking (3, 4, and 5 km x h(-1)), performed for 3 min each. Edge detection and wall tracking of high-resolution B-mode arterial ultrasound images, combined with synchronized Doppler waveform envelope analysis, were used to calculate conduit artery diameter and anterograde/retrograde blood flow and shear rate continuously across the cardiac cycle. RESULTS:BA mean blood flow and shear rate increased significantly throughout each exercise protocol (P < 0.001), and BA anterograde blood flow and shear rate showed comparable increases throughout each protocol (P < 0.001). Retrograde blood flow and shear rate, however, demonstrated a significant increase during cycling and walking (P < 0.001) but not during leg kicking. CONCLUSION:Rhythmic lower limb exercise (cycling and walking) results in an increase in BA systolic anterograde blood flow and shear rate, directly followed by a large retrograde flow and shear rate. This typical pattern, previously linked with endothelial NO release, is not present during a different type of exercise such as leg kicking.
journal_name
Med Sci Sports Exercjournal_title
Medicine and science in sports and exerciseauthors
Thijssen DH,Dawson EA,Black MA,Hopman MT,Cable NT,Green DJdoi
10.1249/MSS.0b013e3181923957subject
Has Abstractpub_date
2009-05-01 00:00:00pages
1072-9issue
5eissn
0195-9131issn
1530-0315pii
00005768-200905000-00013journal_volume
41pub_type
杂志文章abstract：PURPOSE:Muscle sympathetic nerve activity (MSNA) is increased in older endurance-trained men, yet the reflex sympathetic forearm vasoconstrictor response to graded lower body negative pressure (LBNP) diminishes with age. The aim of this study was to assess the influence of aerobic exercise capacity on this altered neur...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e31822a68a5
更新日期：2012-02-01 00:00:00
abstract：:A biomechanical model of the ankle joint was developed and was used to predict the forces at the ankle during the stance phase of running. Measurements from five cadavers were averaged to obtain insertion points and directions of pull of equivalent tendons with respect to the assumed center of the ankle joint. A minim...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/00005768-198204000-00010
更新日期：1982-01-01 00:00:00
abstract：:The 1-mile run/walk test is the field test of choice for evaluating maximal aerobic power (VO2max) in school-aged children. The objective of this study was to determine the relative importance of selected metabolic determinants of mile run/walk performance in children 6-14 yr of age. Mile run/walk time (MRWT), VO2max,...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：
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abstract：PURPOSE:To compare the maximum oxygen uptake V0(2max) of elite endurance athletes and to explain why the body mass exponent, necessary to render V0(2max) independent of body mass, appears to be greater than 0.67. METHODS:Study 1: V0(2max) of 174 international sportsmen and women was assessed. Athletes were recruited f...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/01.MSS.0000053728.12929.5D
更新日期：2003-03-01 00:00:00
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journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1097/00005768-199810000-00006
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abstract：:Bicycling is a complex sport in which an athlete's energy cost is related to two principal forces: air resistance when traveling on flat terrain, and gravity when traveling uphill. Both wind tunnel data and physiological measurements suggest that air resistance scales as body mass to about the 1/3 power. Thus, large c...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章,评审
doi：
更新日期：1994-01-01 00:00:00
abstract：:To determine whether a 13C-bicarbonate, isotope dilution technique could be used to estimate relative changes in energy expenditure of leisure activities of short duration, we studied eight adolescents who performed the following activities: watching television (120 min); playing a stringed instrument (60 min plus 60 ...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1097/00005768-199709000-00021
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journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e3181a6519c
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journal_title：Medicine and science in sports and exercise
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doi：10.1249/MSS.0000000000000271
更新日期：2014-08-01 00:00:00
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journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：
更新日期：1983-01-01 00:00:00
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journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章,评审
doi：10.1097/00005768-199608000-00010
更新日期：1996-08-01 00:00:00
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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
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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
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journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1097/00005768-200202000-00008
更新日期：2002-02-01 00:00:00
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journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：
更新日期：1993-12-01 00:00:00
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journal_title：Medicine and science in sports and exercise
pub_type： 临床试验,杂志文章
doi：10.1249/MSS.0b013e31821b12eb
更新日期：2011-10-01 00:00:00
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journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：
更新日期：1987-10-01 00:00:00
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journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/00005768-198201000-00002
更新日期：1982-01-01 00:00:00
abstract：PURPOSE:To examine whether normalized quadriceps and hamstring strength would predict quadriceps and hamstring muscle activation amplitudes and whether these neuromuscular factors would predict knee kinematics and kinetics during a drop jump task. METHODS:Thirty-nine females and 39 males were measured for isometric qu...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e3181e3b3f
更新日期：2009-04-01 00:00:00
abstract：INTRODUCTION:Gastroesophageal reflux disease is a disorder in which gastric contents move from stomach to esophagus. Exercise is a recognized contributing factor to reflux in healthy volunteers and is reported to be proportional to exercise intensity and the type of exercise. Our aim was to explore changes in physiolog...
journal_title：Medicine and science in sports and exercise
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doi：10.1249/01.MSS.0000064937.99001.56
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journal_title：Medicine and science in sports and exercise
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journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/00005768-199402000-00013
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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
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journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
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更新日期：2006-05-01 00:00:00
abstract：PURPOSE:Resting cardiac vagal modulation (RCVM) and postexercise vagal reactivation (PEVR) are markers of parasympathetic activity. We investigated whether adaptations in these markers to aerobic training are influenced by baseline autonomic control. METHODS:Forty healthy men (19.2 ± 0.8 yr) of similar cardiorespirato...
journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章,随机对照试验
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更新日期：2015-06-01 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
pub_type： 杂志文章
doi：
更新日期：2005-06-01 00:00:00
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journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1097/00005768-200203000-00012
更新日期：2002-03-01 00:00:00
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journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0000000000000393
更新日期：2015-01-01 00:00:00
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journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e3181e1fba9
更新日期：2010-12-01 00:00:00
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journal_title：Medicine and science in sports and exercise
pub_type： 杂志文章
doi：10.1249/MSS.0b013e3181d85527
更新日期：2010-09-01 00:00:00
