MUSCLE TWITCH TENSION, INFLUENCE OF ELECTRICAL STIMULATING CONDITIONS AT DIFFERENT TEMPERATURES. IV. TIME RATE OF RISE OF TENSION,

Various arrangements for coupling whole frog sartorius muscles to transducers were investigated, with special attention to a configuration readily reproducible from one investigator to another and consistent with a minimum influence of the characteristics of the attachments on the recorded values of tension. An arrangement satisfying these two criteria was achieved, and the time rates of rise of tension observed at various temperatures were greater than those normally reported for other methods of attachment. The values of the times rates of rise of tension measured in chloride and nitrate Ringers are considered in relation to basic muscle mechanisms.