TY - JOUR
T1 - The effect of repeated periods of speed endurance training on performance, running economy and muscle adaptations
AU - Skovgaard, Casper
AU - Almquist, Nicki Winfield
AU - Bangsbo, Jens
N1 - CURIS 2018 NEXS 051
PY - 2018/2/1
Y1 - 2018/2/1
N2 - 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/min, mean±SD) who performed 10 speed endurance training (SET; repeated 30-seconds “all-out” bouts) and 10 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) and v10-km (14.3±0.9 km/h), 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) were the same prior to P1 and P2, whereas RE was better (P<.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<.05) to the same extent, respectively. Performance in RRT was 20% better (P<.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.
AB - 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/min, mean±SD) who performed 10 speed endurance training (SET; repeated 30-seconds “all-out” bouts) and 10 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) and v10-km (14.3±0.9 km/h), 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) were the same prior to P1 and P2, whereas RE was better (P<.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<.05) to the same extent, respectively. Performance in RRT was 20% better (P<.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.
KW - Trained runners
KW - Muscle memory
KW - Running performance
U2 - 10.1111/sms.12916
DO - 10.1111/sms.12916
M3 - Journal article
C2 - 28543734
SN - 0905-7188
VL - 28
SP - 381
EP - 390
JO - Scandinavian Journal of Medicine & Science in Sports
JF - Scandinavian Journal of Medicine & Science in Sports
IS - 2
ER -