Document Detail


Gender differences in brachial blood flow during fatiguing intermittent handgrip.
MedLine Citation:
PMID:  18317376     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: Females have been reported to have greater resistance to skeletal muscle fatigue than males. Blood flow, which plays an important role in supplying oxygen and nutrients to working muscles, may play an important role in the mechanisms of gender difference. We hypothesized that females would have greater conduit artery blood flow supplying working muscles than males during intermittent maximal handgrip exercise. METHODS: Healthy adult (22-31 yr old) males (N = 8) and females (N = 8), lying in a supine position, repeated static maximal voluntary contractions (MVC) with a handgrip device in an intermittent pattern. Mean brachial arterial blood flow (MBABF) was continuously monitored using Doppler ultrasonography during the 5-s muscle-relaxation phase, when intramuscular pressure does not impede measurement of muscle blood flow during the 4-min exercise period, and continuously during the 10-min recovery period. Vascular conductance (VC) was calculated from the MBABF normalized by forearm volume and mean blood pressure (MBP). RESULTS: Females achieved higher relative muscle force (%MVC) than males throughout both the exercise and the recovery periods (P < 0.05); females tended to exhibit smaller declines in muscle force (i.e., less fatigue). Exercise-induced increases in MBABF normalized to forearm volume were greater in females compared with males during the relaxation phases (P < 0.05), during which females also exhibited greater VC than males (P < 0.05). CONCLUSION: Our findings suggest that the normalized MBABF and VC in females, who experience less muscle fatigue, are greater during intermittent maximal voluntary handgrip exercise.
Authors:
Yoko Saito; Motoyuki Iemitsu; Takeshi Otsuki; Seiji Maeda; Ryuichi Ajisaka
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  40     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2008 Apr 
Date Detail:
Created Date:  2008-03-18     Completed Date:  2008-06-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  684-90     Citation Subset:  IM; S    
Affiliation:
Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan.
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MeSH Terms
Descriptor/Qualifier:
Adult
Blood Pressure
Brachial Artery / physiology*,  ultrasonography
Echocardiography, Doppler
Exercise / physiology*
Exercise Tolerance
Fatigue / physiopathology*
Female
Heart Rate
Humans
Male
Muscle, Skeletal / blood supply*
Pilot Projects
Prospective Studies
Sex Factors
Time Factors
Vasodilation

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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