The Claim
Chronic static stretching interventions lasting at least two weeks produce small but statistically significant increases in maximal strength and muscle hypertrophy in healthy adults, independent of traditional resistance training, likely through prolonged mechanical tension stimulating functional and morphological adaptations.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Holding stretches for a few weeks in a row can actually make your muscles a little stronger and bigger, even if you don't do traditional weightlifting. This happens because keeping the muscle under tension for a long time signals it to adapt and grow.
See the scientific wording
Chronic static stretching interventions lasting at least two weeks produce small but statistically significant increases in maximal strength (standardized mean difference d=0.30) and muscle hypertrophy (d=0.20) in human skeletal muscle. These adaptations occur independently of traditional resistance training and suggest that prolonged mechanical tension from stretching can stimulate functional and morphological muscle adaptations in healthy adults.
What the research says
1 studyDoing static stretches for at least two weeks can slightly but noticeably make your muscles stronger and bigger, even if you aren't lifting weights. However, you need to stretch for a long time and frequently to see these small gains.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.