Figure 4. Twitch heat as functions of active stress.

A–C, linear regression of active heat–stress relations arising from a single trabecula under control conditions (A) and from the averages of n = 4 trabeculae from each of LV (B) and RV (C) undergoing isometric contractions at various muscle lengths for all three experimental interventions. D, the average heat intercepts for all three treatments in trabeculae from both ventricles.