Purpose:
The purpose of the present study was to evaluate whole-muscle content of
several proteins involved in the regulation of skeletal muscle mitochondrial
protein content and anaerobic capacity following 4 weeks of extremely
low-volume high-intensity interval training (HIT). Methods: Young, healthy,
recreationally active adult males (n = 8) trained 4 times a week for 4 weeks on
a cycle ergometer. Each session involved 4 min of total exercise comprised of
eight 20 s intervals at ~170% of peak aerobic power separated by 10 s rest.
Muscle biopsies were taken prior to (pre) and ~72 hrs post-training (post). Par-
ticipants completed an incremental peak oxygen up- take (VO2peak)
test and a Wingate test pre-, mid-, and post-training. Results: VO2peak
was elevated (p < 0.05) at mid- (p < 0.05) and post-training (pre:
40.5 ± 3.8 ml·kg-1·min-1, mid: 43.4 ± 2.5 ml·kg-1·min-1,
post-: 47.2 ± 2.9 ml·kg-1·min-1).
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