PHYSIOLOGY OF ACTIVITY
VO2 Max.....
"VO2 max is influenced by several factors
• Gender: lower in women "
"Males remain stronger than females, when adjusting for differences in total body weight. This is due to the higher male muscle-mass to body-weight ratio."
There is probably a testosterone dependent stimulatory effect on muscle contraction as well.
Maughan R J, Watson J S, Weir J (1983). "Strength and cross-sectional area of human skeletal muscle". The Journal of Physiology 338: 37–49. PMC 1197179