Welsman, J. R., Armstrong, N., & Kirby, B. J. (1998). Submaximal oxygen uptake responses and maturation in 12 year-olds. Medicine and Science in Sports and Exercise, 30(5), Supplement abstract 851.

VO2 responses to an incremental submaximal treadmill exercise were studied in boys (N = 97) and girls (N = 97) averaging 12 years of age. Ss were classified into maturation groups I to IV based upon Tanner's indices of pubic hair development.

At each exercise intensity, there was no significant ex difference in absolute VO2 but values of VO2 related to body mass were significantly higher in boys than girls. Absolute VO2 increased significantly with stages of maturation but when related to body mass differences were not evident.

Boys are less economical than girls while running at 8-10 km/h and independent of body mass, maturation does not influence VO2 response to exercise.

Implication. At submaximal speeds, girls run more economically than do boys.

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