The effect of repeated periods of speed endurance training on performance, running economy and muscle adaptations

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The effect of repeated intense training interventions was investigated in eight trained male runners (maximum oxygen uptake (VO2 -max): 59.3±3.2 ml·kg(-1) ·min(-1) , mean±SD) who performed ten speed endurance training (SET; repeated 30-s 'all-out' bouts) and ten aerobic moderate-intensity training sessions during two 40-day periods (P1 and P2) separated by ~80 days of habitual training. Before and after both P1 and P2, subjects completed an incremental test to exhaustion to determine VO2 -max and a repeated running test at 90% vVO2 -max to exhaustion (RRT) to determine short-term endurance capacity. In addition, running economy (RE) was measured at 60% vVO2 -max (11.9±0.5 km·h(-1) ) and v10-km (14.3±0.9 km·h(-1) ), a 10-km track-running test was performed, and a biopsy from m. vastus lateralis was collected. 10-km performance and VO2 -max (ml·min(-1) ) was the same prior to P1 and P2, whereas RE was better (P<0.05) before P2 than before P1. During P1 and P2, 10-km performance (2.9 and 2.3%), VO2 -max (2.1 and 2.6%) and RE (1.9 and 1.8% at 60% vVO2 -max; 1.6 and 2.0% at v10-km) improved (P<0.05) to the same extent, respectively. Performance in RRT was 20% better (P<0.05) after compared to before P2, with no change in P1. No changes in muscle expression of Na(+) ,K(+) -ATPase α1, α2 and β1, NHE1, SERCA1 and SERCA2, actin and CamKII were found during neither P1 nor P2. Thus, the present study demonstrates that a second period of intense training leads to improved short-term performance and further improved RE, whereas 10-km performance and VO2 -max improve to the same extent as during the first period. This article is protected by copyright. All rights reserved.

TidsskriftScandinavian Journal of Medicine & Science in Sports
Udgave nummer2
Sider (fra-til)381-390
Antal sider10
StatusUdgivet - 2018

Bibliografisk note

CURIS 2018 NEXS 051

ID: 178738713