Fig. 3. Individual twitch curves from the tailshaker muscles of a western diamondback rattlesnake (Crotalus atrox) rattling at 10°C (dashed line) and 30°C (solid line). The area under each curve represents the tension–time integral (TTI) for the half-cycle. In this example, the peak tension at 30°C is 3.1 times the value at 10°C, whereas the TTI at 30°C is only 1.5 times the value at 10°C. Mean changes in tension and TTI are shown in Table 2 and Fig. 4. Snake mass 810 g, tailshaker muscle mass 6.2 g.