"The second and more probable theory for how stretching improves flexibility is a change in sensation. The latest research has shown that much of the short-term increase in flexibility comes from improving your stretch tolerance (or pain tolerance), not from increasing your muscles’ length!"
"The improvements seen in these short-term programs are a result of increased tolerance to muscle stretching. The research shows that there is no actual lengthening of the muscle fibers."
本野個兩句嘢嘅reference: K. Weimann and K. Hahn, “Influences of strength, stretching and circulatory exercises on flexibility parameters of the human hamstrings,” International Journal of Sports Medicine 18, no. 5 (1997): 340–6;
D. Knudson, “The biomechanics of stretching,” Journal of Exercise Science & Physiotherapy 2 (2006): 3–12;
S. P. Magnussson, E. B. Simonsen, P. Aagaard, H. Sørensen, and M. Kjaer, “A mechanism for altered flexibility in human skeletal muscle,” Journal of Physiology 497, Pt 1 (1996): 291–8;
C. H. Weppler and S. P. Maggnusson, “Increasing muscle extensibility: a matter of increasing length or modifying sensation?” Physical Therapy 90, no. 3 (2010): 438–49.