PHSI 208 Lecture Notes - Lecture 20: Long-Distance Running, Cellular Respiration, Serca
Document Summary
Type 1 = generates small amount of tension for a very long period of time (under 2g of tension is generated) Type 2x = generates 50g of tension in a short period of time (rapidly fatigues) Determinants of muscle force/tension development: force/muscle cell, fiber diameter = large fiber diameter produces more tension, fatigability = for how long it can develop the peak force. The amount of tension developed is directly proportional to the number of cross bridges formed. Opti(cid:373)al resti(cid:374)g le(cid:374)gth is (cid:449)he(cid:374) there"s a(cid:374) opti(cid:373)al a(cid:373)ou(cid:374)t of o(cid:448)erlap (cid:271)/(cid:449) the thi(cid:272)k a(cid:374)d thin filaments, providing optimal amount cross bridges formed and optimal amount of force. It generates the maximum amount of tension for an individual twitch. If a muscle is contracted past its optimal resting length, less cross bridge cycling occurs before the thick filaments bump into the z disk generates less tension.
