Table 1.

Mean values of the kinetic parameters for the decline in P_iO2 at the start of contractions of single Xenopus laevis skeletal muscle fibers at different temperatures

	PiO2,bl, Torr	ΔPiO2, Torr	TD, s	τPiO2, s	MRT, s
15°C (C)	41.3 ± 5.3	17.2 ± 7.3*	59 ± 35*	89 ± 34*	148 ± 55*
20°C (N)	44.2 ± 5.4	24.8 ± 8.1	35 ± 26	52 ± 15	85 ± 36
25°C (H)	45.3 ± 7.7	36.3 ± 8.4*	27 ± 14	37 ± 10*	61 ± 15*

Values are means ± SD. C, cold; N, normal; H, hot; P_iO2bl, baseline resting intracellular Po₂ (P_iO2) value; ΔP_iO2, projected amplitude of the exponential above baseline; TD, time delay of the exponential phase; τP_iO2, time constant of the exponential phase; MRT, mean response time (calculated from TD + τP_iO2).

^*P < 0.05 compared with N.