Mixed
Metabolic stress and metabolites may act as hypertrophy stimuli, particularly when combined with blood flow restriction or low-load exercise, but the specific metabolite candidates are poorly characterized.
While metabolic stress (the 'burn') is often associated with muscle growth, the paper suggests it is not the primary driver. Low-load training with blood flow restriction can induce hypertrophy, likely through metabolic factors, but this is less well-understood than mechanical load. Focus on mechanical tension first; metabolic stress may be a useful adjunct.
Interventions that combine blood flow restriction and especially low load resistance exercise suggest that resistance exercise-regulated metabolites could be hypertrophy stimuli, but this is based on indirect evidence and metabolite candidates are poorly characterized.
Why this rating
The paper explicitly states the evidence is 'indirect' and metabolites are 'poorly characterized.'
Source
Stimuli and sensors that initiate skeletal muscle hypertrophy following resistance exercise
Henning Wackerhage et al. · Journal of Applied Physiology · 2018
DOI 10.1152/japplphysiol.00685.2018
More from this paper
- Mechanical load is the primary initiating stimulus for skeletal muscle hypertrophy following resistance exercise, with loads as low as 30% of 1RM being sufficient to trigger near-maximal hypertrophic gains when taken to failure.Good
- Mechanical load is sensed by specific proteins including filamin-C, BAG3, titin, and costameres (integrins, FAK), which transduce force into hypertrophic signaling via mTORC1 and Hippo pathway activation.Moderate
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