THERMAL PROPERTIES OF THE SKELETAL MUSCLE Thermal changes AV Hill made the funoamental works

Vgreus ways, (v) repetitive stimuli causa (atigue of the muscle Exact cause of faligue is debatable, but probably wines in the isolated muscle from the 'general latigue'. (iv) The foice generated by the muscle is variable and depends upon several factors, notably on rls relaxed length, the load and recruitment, (VI) the efficiency of the muscle also varies from time to time and depends on the relaxed length and bad. THERMAL PROPERTIES OF THE SKELETAL MUSCLE Thermal changes AV Hill made the funoamental works which were later extende d enormously with the help of modern instruments (which can record very small temperature changes accurately in a time scale). The present day conception is staled below. The muscle generates heat, even when It is resting An additional amount of heal is produced. when it contracts For The present discussion, only this additional neat [henceforth referred simply as heat) will to considered" (A) In case of a single Lwitah. The heal evolve in several phases and named accordingly. The phases are, (i) activation heat (ii) shortening heal, (in) heat for the work done and (Iv) recovery heat, (i) Activation heat, (also called the initial heat) is liberated before the actual contraction of the muscle. It Is due lo mostly, The hear liberated white Ga++ ens are released from the L system (n) Shortening heal is The heal liberated in the next phase, when the muscle e actually shortening..