| Effects of altering pedal frequency on the slow component of pulmonary VO2 kinetics and EMG activity. | |
| | |
MedLine Citation:
|
PMID: 20432199 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
This study investigated the effects of pedal frequency on the slow component of pulmonary oxygen uptake ( V O(2)) kinetics during heavy exercise at the same relative intensity. We hypothesized that higher pedal frequency (expected to enhance fast-twitch muscle fiber recruitment) would be associated with greater slow component amplitude (A' (s)), surface electromyography (normalized root mean square; RMS) and blood lactate concentration ([lactate]). Eight subjects performed square-wave transitions to heavy exercise at 35 and 115 rpm. Furthermore, alternated cadences square-wave transitions (35-115 rpm) were performed to examine the potential effects of additional fast-twitch muscle fiber recruitment on the slow component. Significance was accepted when P<0.05. The A' (s) was greater at higher cadences (0.58+/-0.08 and 0.70+/-0.09 L.min (-1) at 115 and 35-115 rpm, respectively) than at 35 rpm (0.35+/-0.04 L.min (-1)). Greater EMG increase over time (DeltaRMS ((10-3 min))) and [lactate] were observed at 115 and 35-115 rpm compared with 35 rpm. There was a significant correlation between A' (s) and overall DeltaRMS ((10-3 min)) for all pedal frequencies combined (r=0.63; P=0.001). Pedal frequency had no effect on time constants or time delays. These findings are consistent with the concept that progressive recruitment of muscle fibers is associated with the V O(2) slow component. |
| | |
Authors:
|
D M Hirai; B T Roseguini; F Diefenthaeler; F P Carpes; M A Vaz; E L Ferlin; J P Ribeiro; F Y Nakamura |
Related Documents
:
|
11394239 - Evidence for neuromuscular fatigue during high-intensity cycling in warm, humid conditi... 11820689 - The influence of crank rate on peak oxygen consumption during arm crank ergometry. 6500789 - Bicycle ergometry and speed skating performance. 17474039 - Optimized versus corrected peak power during friction-braked cycle ergometry in males a... 12413039 - A comparison of peak power in the shoulder press and shoulder throw. 16195019 - Stability of pedalling mechanics during a prolonged cycling exercise performed at diffe... 10742439 - Influence of physical activity on ultrasound and dual-energy x-ray absorptiometry bone ... 8596479 - Defective endogenous opioid response to exercise in type i diabetic patients. 209899 - Effect of submaximal isometric exercise on catecholamine, camp and lactate concentratio... |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-04-29 |
Journal Detail:
|
Title: International journal of sports medicine Volume: 31 ISSN: 1439-3964 ISO Abbreviation: Int J Sports Med Publication Date: 2010 Aug |
Date Detail:
|
Created Date: 2010-07-28 Completed Date: 2010-11-08 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 8008349 Medline TA: Int J Sports Med Country: Germany |
Other Details:
|
Languages: eng Pagination: 529-36 Citation Subset: IM |
Copyright Information:
|
(c) Georg Thieme Verlag KG Stuttgart . New York. |
Affiliation:
|
Department of Physical Education, State University of Londrina, Londrina, Brazil. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Adult Bicycling / physiology* Electromyography Exercise Test / methods* Humans Male Muscle Fibers, Fast-Twitch / metabolism Muscle, Skeletal / metabolism Oxygen Consumption* Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: The Influence of Acute Resistance Training and Body Composition on Coagulation and Fibrinolytic Acti...
Next Document: Finger Blood Pressure During Leg Resistance Exercise.