Key result
Low-load resistance exercise with blood flow restriction placed significantly greater metabolic stress on the exercising muscle, evidenced by greater phosphocreatine depletion, lower intracellular pH, and lower oxygenation levels compared to non-restricted exercise (p<0.01).
Why the study?
Does low-load resistance exercise with blood flow restriction increase metabolic stress and hypoxia in skeletal muscle compared to non-restricted exercise in healthy males?
RCT (n=7)
Open-label
Randomized crossover
No
Does low-load resistance exercise with blood flow restriction increase metabolic stress and hypoxia in skeletal muscle compared to non-restricted exercise in healthy males?
Low-load resistance exercise with blood flow restriction induces significantly greater metabolic stress and hypoxia in skeletal muscle compared to non-restricted exercise, potentially explaining its efficacy for muscle hypertrophy.
Offers a mechanistic rationale for muscle hypertrophy with low-load blood flow restriction training; leaves open whether.
We aimed to evaluate the effects of low-load resistance exercise with blood flow restriction (BFR) on high-energy phosphate metabolism, intracellular pH, and oxygenation level in the skeletal muscle. Seven males performed low-load ankle plantar flexion exercise (120 repetitions, 30% of one-repetition maximum) with and without BFR (130% of systolic blood pressure) inside a magnetic resonance device. Inorganic phosphate (Pi)-to-phosphocreatine (PCr) ratio, intracellular pH, and tissue oxygenation index (TOI) in the medial gastrocnemius were determined using 31 P-magnetic resonance spectroscopy and near-infrared spectroscopy before and during exercise. The Pi-to-PCr ratio significantly increased during exercise in both conditions, with the BFR-condition values significantly exceeding the control-condition values. The BFR and control conditions showed significantly decreased intracellular pH during exercise, with the BFR-condition values being significantly lower than the control-condition values. The TOI significantly decreased during both exercises, but the decreases in the BFR condition were significantly greater than those observed in the control condition. Low-load BFR exercise places greater metabolic stress (greater PCr depletion, lower intracellular pH, and lower oxygenation level) on an exercising muscle than low-load non-restricted exercise.
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Yanagisawa et al. (2017) conducted an RCT in Healthy (n=7). Low-load resistance exercise with blood flow restriction vs. Low-load resistance exercise without blood flow restriction was evaluated on Intramuscular energy metabolism (Pi-to-PCr ratio), intracellular pH, and tissue oxygenation index (TOI) (p=<0.01). Low-load resistance exercise with blood flow restriction placed significantly greater metabolic stress on the exercising muscle, evidenced by greater phosphocreatine depletion, lower intracellular pH, and lower oxygenation levels compared to non-restricted exercise (p<0.01).
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