Document Detail

Influence of crank rate on the slow component of pulmonary O(2) uptake during heavy arm-crank exercise.
MedLine Citation:
PMID:  16770358     Owner:  NLM     Status:  MEDLINE    
The principal aim of this study was to examine the influence of variations in crank rate on the slow component of the pulmonary oxygen uptake ((.)VO(2)) response to heavy-intensity arm-crank ergometry (ACE). We hypothesized that, for the same external work rate, a higher crank rate would elicit a greater amplitude of the (.)VO(2) "slow component". Eleven healthy males (mean (+/- SD) age, 25 ((+/-6) y; body mass, 89.1 ((+/-10.7) kg; ACE (.)VO(2)(peak), 3.36 ((+/-0.47) L x min(-1)) volunteered to participate. The subjects initially completed an incremental exercise test for the determination of (.)VO(2)(peak) and peak power on an electrically braked arm ergometer. Subsequently, they completed "step" transitions from an unloaded baseline to a work rate requiring 70% of peak power: 2 at a crank rate of 50 r x min(-1) (LO) and 2 at a crank rate of 90 r x min(-1) (HI). Pulmonary gas exchange was measured on a breath-by-breath basis and (.)VO(2) kinetics were evaluated from the mean response to each condition using non-linear regression techniques. In contradiction to our hypothesis, the (.)VO(2) slow component was significantly greater at 50 r x min(-1) than at 90 r x min(-1) (LO: 0.60 +/- 0.30 vs. HI: 0.47 +/- 0.21 L x min(-1); p < 0.05). The mean value for the localized rating of perceived exertion was also higher at 50 r x min(-1) than at 90 r x min(-1) (LO: 16.7 +/- 1.4 vs. HI: 15.2 +/- 1.3; p < 0.05), but there was no significant difference in end-exercise blood lactate concentration. It is possible that differences in muscle tension development and blood flow resulted in a greater contribution of "low-efficiency" type II muscle fibres to force production at the lower crank rate in ACE, and that this was linked to the greater (.)VO(2) slow component. However, other factors such as greater isometric contraction of the muscles of the trunk and legs at the lower crank rate might also be implicated.
Paul M Smith; Eilidh McCrindle; Mike Doherty; Michael J Price; Andrew M Jones
Related Documents :
19786258 - A multicenter study of noninvasive cardiac output by bioreactance during symptom-limite...
17488808 - Muscle na+-k+-atpase response during 16 h of heavy intermittent cycle exercise.
24656108 - Obesity paradox, cachexia, frailty, and heart failure.
20664198 - Impact of reduced kidney function on cardiopulmonary fitness in patients with systolic ...
22310508 - The validity and reliability of 5-hz global positioning system units to measure team sp...
25072488 - Planning and executing complex large-scale exercises.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied physiology, nutrition, and metabolism = Physiologie appliquée, nutrition et métabolisme     Volume:  31     ISSN:  1715-5312     ISO Abbreviation:  -     Publication Date:  2006 Jun 
Date Detail:
Created Date:  2006-06-13     Completed Date:  2006-10-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101264333     Medline TA:  Appl Physiol Nutr Metab     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  292-301     Citation Subset:  IM    
Centre for Sport and Exercise Science, University of Greenwich, Chatham, UK.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Exercise / physiology*
Lung / metabolism*
Oxygen / metabolism*
Time Factors
Reg. No./Substance:

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

Previous Document:  Can body weight supported treadmill training increase bone mass and reverse muscle atrophy in indivi...
Next Document:  Reduced glycogen availability is associated with increased AMPKalpha2 activity, nuclear AMPKalpha2 p...