Research

Hormonal

KAATSU training (blood flow restriction) combined with low-intensity exercise induces muscle strength and hypertrophy, primarily through increased circulating growth hormone (GH) and insulin-like growth factor-1 (IGF-1).

To use KAATSU training, apply specialized cuffs to restrict blood flow to your limbs while performing low-intensity exercises like walking or light weights for 5-30 minutes, 1-3 times a week. This method leverages hormonal responses to build muscle and strength without the heavy loads or muscle damage associated with traditional heavy resistance training.

ModerateSupportsMEDIUM confidence
Under the conditions of restricted muscle blood flow, even short-term, low-intensity exercise can induce muscle strength, and hypertrophy... In addition, KAATSU training increases the amount of circulating growth hormone (GH)... which may enhance lipolysis and bone formation... GH stimulates the liver to secrete insulin-like growth factor-1 (IGF-1)... which may improve the function of endothelium and insulin sensitivity.
Toshiaki Nakajima et al. · International Journal of KAATSU Training Research · 2006

Why this rating

Based on a national survey of facilities rather than a controlled randomized trial, though it covers a large population.

Source

Use and safety of KAATSU training:Results of a national survey

Toshiaki Nakajima et al. · International Journal of KAATSU Training Research · 2006

DOI 10.3806/ijktr.2.5

cross_sectional · n=12642Cited 281×
Read the paper
DOI resolved against Crossref · corpus check 2026-06-10

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