摘要：Sex differences in triathlon performance have been decreasing in recent decades and little information is available to explain it. Thirty-nine male and eighteen female amateur triathletes were evaluated for fat mass, lean mass, maximal oxygen uptake (VO
2 max), ventilatory threshold (VT), respiratory compensation point (RCP), and performance in a national Olympic triathlon race. Female athletes presented higher fat mass (
p = 0.02,
d = 0.84, power = 0.78) and lower lean mass (
p < 0.01,
d = 3.11, power = 0.99). VO
2 max (
p < 0.01,
d = 1.46, power = 0.99), maximal aerobic velocity (MAV) (
p < 0.01,
d = 2.05, power = 0.99), velocities in VT (
p < 0.01,
d = 1.26, power = 0.97), and RCP (
p < 0.01,
d = 1.53, power = 0.99) were significantly worse in the female group. VT (%VO
2 max) (
p = 0.012,
d = 0.73, power = 0.58) and RCP (%VO
2 max) (
p = 0.005,
d = 0.85, power = 0.89) were higher in the female group. Female athletes presented lower VO
2 max value, lower lean mass, and higher fat mass. However, females presented higher values of aerobic endurance (%VO
2 max), which can attenuate sex differences in triathlon performance. Coaches and athletes should consider that female athletes can maintain a higher percentage of MAV values than males during the running split to prescribe individual training.
