Oral Contraceptive Use Dampens Physiological Adaptations to Sprint Interval Training.

Purpose: Oral contraceptive (OC) use reduces peak aerobic capacity (V[spacing dot above]O2peak), however, whether it also influences adaptations to training has yet to be determined. This study aimed to examine the influence of OC use on peak performance [peak power output (PPO)] and physiological adaptations [V[spacing dot above]O2peak and peak cardiac output (Q[spacing dot above]peak)] following sprint interval training (SIT) in recreationally-active women. Methods: Women taking an OC (n=25) or experiencing natural regular menstrual cycles (MC; n=16) completed an incremental exercise test to assess V[spacing dot above]O2peak, PPO, and Q[spacing dot above]peak before, immediately after, and four weeks following 12 sessions of SIT. The SIT consisted of 10, one-minute efforts at 100-120% PPO in a 1:2 work:rest ratio. Results: Though V[spacing dot above]O2peak increased in both groups following SIT (both p

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