Three km Track Time Trial Performance Changes after HIIT in Competitive Cross-Country Skiers

Background: Limited research surrounding sex differences in fatigue and performance after high intensity interval training (HIIT) exists the field setting. While lab-based protocols provide a controlled environment, physiological mechanisms of response competitive athletes are best measured by time-trial (TT). Few studies, however, have investigated TT while controlling for menstrual cycle (MC). Objective: The study influence MC phase on 3km track HIIT session Competitive Cross Country (XC) skiers. Methods: A quasi-experimental design was employed over age 16 years (30F, 9M), were recruited from across Canada completed 3 days testing/training: Day 1 3; (4-8x, 800m) 2. verified ovulation testing salivary hormone samples; classified as either “Low Hormone” or “High analysis. Results: An overall improvement pre- to post-HIIT TTs occurred (p<0.01). No significant observed between sexes (p=0.16) (p=0.26). Conclusion: These results indicate that XC skiers will likely experience an bout HIIT. Coaches should plan their workouts prior accordingly maximize performance. also suggest no special adjustments need be considered phase, although further studies with greater sample size repeated warranted.