The increasing use of various VO2 max expressions as test measures is a problem because the magnitude of sex difference varies considerably with each expression. A valid match of male and female test subjects would consider physical activity history and the amount of endurance exercise done in the previous year. (Author/FG)

Greater body fatness is one characteristic that partly explains why women, on the average, do not perform as well as men in strenuous tasks requiring movement of body weight. (JD)

This study does not support the contention that individual differences in distance running ability are primarily due to variations in cardiovascular-respiratory capacity, but that the influences of body size, body composition, and running speed should also be recognized. (MB)