The Claim
Long-duration static stretching combined with resistance training is not associated with meaningful increases in plantar flexor fascicle length in highly trained athletes over a 12-week period, indicating that flexibility and strength adaptations from prolonged stretching in experienced individuals likely occur through mechanisms independent of serial sarcomere addition or fascicle elongation.
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.
Adding long static stretches to weightlifting doesn't actually make the calf muscles longer in experienced athletes over three months. This means that when advanced lifters get more flexible and stronger from stretching, it's probably happening for reasons other than just physically lengthening the muscle fibers.
See the scientific wording
The implementation of long-duration static stretching alongside resistance training is not associated with meaningful increases in fascicle length within the plantar flexors of highly trained athletes over a 12-week period. This lack of architectural change suggests that prolonged stretching may enhance flexibility and strength through mechanisms other than serial sarcomere addition or fascicle elongation in experienced individuals.
What the research says
1 studyThe study found that stretching and lifting weights for 12 weeks made a bodybuilder more flexible and stronger without actually lengthening the muscle fibers. This suggests the gains came from other body adaptations rather than the muscles physically growing longer.
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.