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

TY - JOUR

T1 - Effect of tapering after a period of high-volume sprint interval training on running performance and muscular adaptations in moderately trained runners

AU - Skovgaard, Casper

AU - Almquist, Nicki Winfield

AU - Kvorning, Thue

AU - Christensen, Peter Møller

AU - Bangsbo, Jens

N1 - CURIS 2018 NEXS 043

PY - 2018/2

Y1 - 2018/2

N2 - 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 (VO2max): 56.8 ± 2.9 ml·min-1·kg-1; mean ± SD] conducted high-volume SIT (HV; 20 SIT sessions; 8-12 × 30 s all-out) for 40 days followed by 18 days of tapering (TAP; 4 SIT sessions; 4 × 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 vVO2max 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)α1, NKAβ1, 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 vVO2max 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.

AB - 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 (VO2max): 56.8 ± 2.9 ml·min-1·kg-1; mean ± SD] conducted high-volume SIT (HV; 20 SIT sessions; 8-12 × 30 s all-out) for 40 days followed by 18 days of tapering (TAP; 4 SIT sessions; 4 × 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 vVO2max 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)α1, NKAβ1, 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 vVO2max 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.

KW - Running economy

KW - Na+-K+-ATPase

KW - Sarcoplasmic reticulum calcium transport ATPase

U2 - 10.1152/japplphysiol.00472.2017

DO - 10.1152/japplphysiol.00472.2017

M3 - Journal article

C2 - 28935825

SN - 8750-7587

VL - 124

SP - 259

EP - 267

JO - Journal of Applied Physiology

JF - Journal of Applied Physiology

IS - 2

ER -