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. Author manuscript; available in PMC: 2015 Aug 1.
Published in final edited form as: J Muscle Res Cell Motil. 2014 Jul 24;35(0):225–234. doi: 10.1007/s10974-014-9386-9

Figure 4.

Figure 4

Decline in relative SR Ca2+ATPase/Na+/Ca2+ exchanger activity is not responsible for a decrease in twitch tension A) Simultaneous recording of stimulation pulse, muscle tension, and temperature in a single cardiac trabecula. The small time lag between temperature and force results from the placement of the temperature probe behind the muscle. B) Ratio of the amplitude of the second to the first rapid-cooling contracture was not different in successive experiments. n = 6, N.S. signifies not significant. At baseline, muscles were stimulated at 1 Hz and 27 °C.