Document Detail


Oxygen uptake and heart rate kinetics during heavy exercise: a comparison between arm cranking and leg cycling.
MedLine Citation:
PMID:  12436276     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study examined the oxygen uptake (VO(2)) and heart rate (HR) kinetics during arm cranking and leg cycling at work rates above the anaerobic threshold (AT). Ten untrained male subjects [21.6 (1.3) years] completed two 7 min 15 s constant-load arm cranking and two leg cycling tests at a power output halfway between the mode-specific AT and peak VO(2). The time constants for phase II VO(2) (tau) and HR (tau) kinetics were determined by fitting a monoexponential curve from the end of phase I until 3 min of exercise. VO(2) tau and HR tau values were significantly (P < 0.001) slower in arm cranking [VO(2) tau = 66.4 (3.0) s; HR tau = 74.7 (4.4) s] than in leg cycling [VO(2) tau = 42.0 (1.9) s; HR tau = 55.6 (3.5) s]. The VO(2) slow component (VO(2SC)) accounted for a significantly (P < 0.001) greater percentage of the total exercise response during arm cranking [23.8 (1.6)%] than during leg cycling [14.2 (1.5)%]. The greater relative VO(2SC) and the slower VO(2) tau with arm exercise are consistent with a greater recruitment of metabolically inefficient type II muscle fibres during arm cranking than during leg cycling.
Authors:
Donald A Schneider; Andrew N Wing; Norman R Morris
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2002-09-18
Journal Detail:
Title:  European journal of applied physiology     Volume:  88     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-11-18     Completed Date:  2003-06-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  100-6     Citation Subset:  IM    
Affiliation:
School of Physiotherapy and Exercise Science, Griffith University, Gold Coast, 9726 Queensland, Australia. D.Schneider@mailbox.gu.edu.au
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MeSH Terms
Descriptor/Qualifier:
Adult
Anaerobic Threshold
Arm / physiology*
Bicycling
Exercise / physiology*
Heart Rate*
Humans
Kinetics
Leg / physiology*
Male
Oxygen Consumption*
Physical Endurance*

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


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