ABSTRACT

　Purpose: The purpose of this study was to investigate whether eight weeks of high-intensity interval training （HIIT） can attenuate sitting-induced impairment in endothelial function. Methods: Twenty-one young, healthy, recreationally active young men and women were randomly assigned to either a control group （CON group, n = 10） or a training group （TR group, n = 11）．The TR group performed cycling ergometer-based and bodyweight-based HIIT four times per week for eight weeks. Before and after the intervention period, participants completed a three-hour sitting test during which popliteal artery flow-mediated dilation（FMD） were measured before and after sitting. Results: In both groups, popliteal artery FMD significantly decreased after three hours of sitting both before and after the intervention period （P < 0.05）．However, post-sitting FMD after the intervention period was significantly higher in the TR group compared to the CON group （P < 0.05）．This group difference remained significant even after adjusting for pre-sitting popliteal artery FMD after the intervention period as a covariate（ P < 0.05）． Conclusion: These findings indicate that eight weeks of HIIT did not completely prevent sitting-induced endothelial dysfunction. However, the degree of impairment was attenuated by the HIIT.

DECENTE SPORTS SCIENCE Vol.47/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE