Hormonal
Brief intense interval exercise (four 30-second all-out cycling bouts with 4-minute rest) activates AMPK and p38 MAPK signaling and increases PGC-1α mRNA expression in human skeletal muscle, inducing metabolic remodeling similar to endurance training without activating hypertrophy pathways.
To trigger metabolic adaptations typically associated with long endurance sessions, you can perform four 30-second all-out cycling sprints with 4 minutes of rest between each. This 14-minute session significantly increases the expression of PGC-1α, a key regulator of mitochondrial biogenesis, without activating muscle growth pathways. This suggests that low-volume, high-intensity interval training is an efficient strategy for improving metabolic health and oxidative capacity.
We conclude that signaling through AMPK and p38 MAPK to PGC-1α may explain in part the metabolic remodeling induced by low-volume intense interval exercise, including mitochondrial biogenesis and an increased capacity for glucose and fatty acid oxidation.
Why this rating
Controlled human study with biopsy sampling, but small sample size (n=6) and acute (single session) design limit generalizability to long-term adaptations.
Source
Brief intense interval exercise activates AMPK and p38 MAPK signaling and increases the expression of PGC-1α in human skeletal muscle
Martin J. Gibala et al. · Journal of Applied Physiology · 2008
DOI 10.1152/japplphysiol.90880.2008
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