Effect of tapering after a period of high-volume sprint interval training on running performance and muscular adaptations in moderately trained runners

摘要

The effect of tapering following a period of high-volume sprint interval training (SIT) and a basic volume of aerobic training on performance and muscle adaptations in moderately trained runners was examined. Eleven (8 men, 3 women) runners [maximum oxygen uptake ((V)over dotO(2max)): 56.8 +/- 2.9 ml.min(-1).kg(-1); mean +/- SD] conducted highvolume SIT (HV; 20 SIT sessions; 8-12 x 30 s all-out) for 40 days followed by 18 days of tapering (TAP; 4 SIT sessions; 4 x 30 s all-out). Before and after HV as well as midway through and at the end of TAP, the subjects completed a 10-km running test and a repeated running test at 90% of v(V)over dotO(2max) to exhaustion (RRT). In addition, a biopsy from the vastus lateralis muscle was obtained at rest. Performance during RRT was better (P 0.01) at the end of TAP than before HV (6.8 +/- 0.5 vs. 5.6 +/- 0.5 min; means +/- SE), and 10-km performance was 2.7% better (P 0.05) midway through (40.7 +/- 0.7 min) and at the end of (40.7 +/- 0.6 min) TAP than after HV (41.8 +/- 0.9 min). The expression of muscle Na+-K+-ATPase (NKA)alpha(1), NKA beta(1), phospholemman (FXYD1), and sarcoplasmic reticulum calcium transport ATPase (SERCA1) increased (P 0.05) during HV and remained higher during TAP. In addition, oxygen uptake at 60% of v(V)over dotO(2max) was lower (P 0.05) at the end of TAP than before and after HV. Thus short-duration exercise capacity and running economy were better than before the HV period together with higher expression of muscle proteins related to Na+/K+ transport and Ca2+ reuptake, while 10-km performance was not significantly improved by the combination of HV and tapering.