The anaerobic performance characteristics of 15 Black males of African ancestry (25 +/- 2 yr; mean +/- SD) and 17 White males of French Canadian ancestry (22 +/- 2 yr) were compared. All subjects were sedentary. Morphological characteristics and body composition were similar in both groups. They were tested for maximal force during voluntary isometric contraction of the knee extensors and for total work output during 10 s, 30 s, and 90 s of maximal and repetitive knee extensions. Results indicated no significant differences between Blacks and Whites in maximal force of the knee extensors (736 +/- 78 N vs 722 +/- 11 N, respectively) and in total work output during the 10-s (1134 +/- 246 J vs 1124 +/- 207 J) and 30-s (2735 +/- 519 J vs 2779 +/- 647 J) tests. There was a difference of about 400 J between Blacks and Whites in the total work output during the 90-s test, but this difference was not statistically significant. However, significant differences were found between Blacks and Whites in the peak power output decrement during the last 60 s of the 90-s anaerobic test. These differences in peak power output between the two groups ranged between 7 and 10 W during the last 30 s of the 90-s test. The results indicate that knee extensor muscles of sedentary Black and White males have similar anaerobic performance power and capacities. However, the results reveal that sedentary Black subjects experience a greater degree of fatigue than sedentary Whites during an anaerobic exercise lasting longer than 30 s.
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