The Claim
In recreationally active adults, an 8-week resistance training program consisting of 5 sets of 10–12 repetitions performed 3 days per week is associated with an approximately 10% increase in maximal isometric strength of the pectoralis major muscle, with no significant change in shoulder range of motion compared to a control group.
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.
If you're someone who exercises regularly, doing chest workouts 3 times a week for 8 weeks might make your chest muscles about 10% stronger, but it won’t change how far you can move your shoulders.
See the scientific wording
In recreationally active adults, 8 weeks of resistance training (5 sets of 10–12 repetitions, 3 days per week) is associated with approximately 10% increase in maximal isometric strength of the pectoralis major, with no significant change in shoulder range of motion compared to control.
What the research says
1 studyThe study found that lifting weights 3 times a week for 8 weeks made chest muscles stronger, just like the claim says, and didn’t make shoulders more flexible, which also matches.
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.