Document Detail

Oxygen uptake transients at the onset and offset of arm and leg work.
MedLine Citation:
PMID:  877453     Owner:  NLM     Status:  MEDLINE    
The halftimes (t1/2) of the VO2 on-and off-responses have been determined on 4 moderately active subjects (1) in arm cranking (VO2 congruent to 1 1/min). (2) in leg pedaling at 4 graded submaximal (VO2 congruent to 0.8 to 2.51/min) work loads, and (3) when superimposing arm cranking on preexisting leg pedaling, both in the supine and in the upright position. In supine experiments the mean t1/2 of the VO2 on-response was longer for arm cranking than for leg pedaling (64 vs 44-49 sec) at equal VO2; however, at the same percentage of arm and leg VO2 max the respective t1/2 were similar. In sitting experiments all t1/2 of the VO2 on-response were shorter than when supine, but the t1/2 for the arms were still slightly longer than those for the legs. When arm cranking was superimposed on preexisting leg pedaling, the t1/4 for arms was reduced both in supine (from 64 to 35-38 sec) and in the sitting position (from 44 to 40 sec). The halftime of the VO2 off-response were much shorter (20-32 sec) than those of the on-response and similar in all experiments. In all conditions the O2 deficits at work onset were considerably larger than the fast component of the corresponding O2 debts during the first minutes of recovery. The difference was totally accounted for by anaerobic glycolysis occurring early during the VO2 on-response, particularly in arm exercise. It is concluded that at submaximal work loads the O2 deficit is accounted for the fast component of the O2 debt plus the O2 equivalent of the early lactate production.
P Cerretelli; D Shindell; D P Pendergast; P E Di Prampero; D W Rennie
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Respiration physiology     Volume:  30     ISSN:  0034-5687     ISO Abbreviation:  Respir Physiol     Publication Date:  1977 Jun 
Date Detail:
Created Date:  1977-08-12     Completed Date:  1977-08-12     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0047142     Medline TA:  Respir Physiol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  81-97     Citation Subset:  IM; S    
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MeSH Terms
Arm / physiology*
Energy Metabolism
Lactates / biosynthesis
Leg / physiology*
Middle Aged
Muscles / metabolism,  physiology*
Oxygen Consumption*
Physical Exertion*
Reg. No./Substance:

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