The Claim
Supervised static stretching of the pectoralis major muscle for 15 minutes per day, 4 days per week over 8 weeks is associated with muscle hypertrophy, as indicated by an increase in muscle thickness of approximately 5.6–6.5% in recreationally active adults, with no statistically significant difference in hypertrophy compared to resistance training.
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.
Stretching your chest muscles for 15 minutes, 4 times a week for 8 weeks, might build muscle just as much as lifting weights — studies say it could increase muscle thickness by around 6%.
See the scientific wording
Supervised static stretching of the pectoralis major for 15 minutes per day, 4 days per week over 8 weeks is associated with muscle hypertrophy, increasing muscle thickness by approximately 5.6–6.5% in recreationally active adults, with changes not significantly different from those produced by resistance training.
What the research says
1 studyThe study found that stretching the chest muscles daily for 8 weeks made them grow just as much as lifting weights, with no real difference between the two.
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.