THE hind limbs of a Hungarian frog are perfused with veratrine 1/50,000 in Ringer's solution. The liquid collected from the vein perfuses a second, similar Trendelenburg's preparation. Direct tetanic ...

KUFFLER et al. 1–3 have shown that in the frog there are two very distinct types of skeletal muscle fibres; one, the more common, is capable of generating spikes and giving twitches; while the other ...

Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

Time under contraction is not directly measured in a typical weight training program. Most people really don't even think about the number of seconds a given muscle is forced to work. Indirectly, ...