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The sarcomere length dependence of the rate of heat production during isometric tetanic contraction of frog muscles.
Author(s) -
Elzinga G,
Peckham M,
Woledge R C
Publication year - 1984
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.1984.sp015513
Subject(s) - isometric exercise , sarcomere , sartorius muscle , chemistry , anatomy , contraction (grammar) , muscle contraction , biophysics , myocyte , biology , medicine , endocrinology
Heat production and force have been measured as a function of sarcomere length between 1.6 and 3.0 microns during isometric tetani at 0 degree C for two types of frog muscle: sartorius and extensor longus digiti iv (e.l.d. iv). Stable heat rate declines linearly with increasing sarcomere length above 2.20 microns for both e.l.d. iv and sartorius muscles. In sartorius muscle stable heat rate remains at or near its maximum value between 1.75 and 2.20 microns while force decreases. In e.l.d. iv muscle, both stable heat rate and force decline linearly as sarcomere length decreases below 2.20 microns.