Document Detail

Are there differences in performance, metabolism, and quadriceps muscle activity in black African and Caucasian athletes during brief intermittent and intense exercise?
MedLine Citation:
PMID:  17565769     Owner:  NLM     Status:  MEDLINE    
The purpose of the present study was to determine whether there are any differences in power output (PO) and/or quadriceps muscle (Quad) activity between black African and Caucasian football players during a force-velocity (fv) exercise test, which consisted of performing maximal 6-s sprints against an increasing load. Each subject started the test with a load of 2 kg and then recovered for 5 min before repeating the same test with a load increased by 2 kg. When the pedal frequency did not exceed 130 rev x min(-1), the load was increased by only 1 kg. Each subject attained the load corresponding to his maximal power if an additional increase in load (+1 kg) induced a power decrease. Nine black Africans (mean age 24.2 +/- 3.3 years) and nine Caucasians (24.7 +/- 4.2 years) (matched for stature and aerobic fitness) participated in the fv exercise test. During the test, PO, blood lactate, and the quadriceps electromyography (EMG) root mean square (Quad RMS) were assessed. Higher blood lactate was observed in Caucasians than in black Africans for POs over the load range from 4 kg up to the maximal power. However, PO and Quad RMS values were similar in Caucasians and black Africans. They also had similar lean leg volume (LLV) and consequently produced similar PO/LLV and Quad RMS/LLV values. Overall, our results suggest that Caucasians and black Africans matched for stature, VO(2max), and training background have similar PO and Quad RMS values, but different blood lactate concentrations during brief, intermittent, intense exercise performed on a cycloergometer.
A Temfemo; C Laparadis; D Bishop; A Merzouk; S Ahmaidi
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article     Date:  2007-06-14
Journal Detail:
Title:  The journal of physiological sciences : JPS     Volume:  57     ISSN:  1880-6546     ISO Abbreviation:  J Physiol Sci     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-10-09     Completed Date:  2008-01-24     Revised Date:  2008-12-29    
Medline Journal Info:
Nlm Unique ID:  101262417     Medline TA:  J Physiol Sci     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  203-10     Citation Subset:  IM    
EA 3300 APS et Conduites Motrices: Adaptations, Réadaptations, Université de Picardie Jules Verne, Faculté des Sciences du Sport, F-80025 Amiens Cedex, France.
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MeSH Terms
African Continental Ancestry Group*
European Continental Ancestry Group*
Exercise / physiology*
Exercise Test
Heart Rate / physiology
Lactic Acid / blood
Muscle, Skeletal / physiology
Quadriceps Muscle / physiology*
Skin Temperature / physiology
Skinfold Thickness
Soccer / physiology
Sports / physiology*
Reg. No./Substance:
50-21-5/Lactic Acid

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

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