Table 1.

Retardation time (τ) in frog mesenteric microvessels at 12–20 °C and 0–5 °C

Gradient of step	τ(s), 12–20 °C	τ(s), 0–5 °C
10mmHg (10s)−1	1.18 ± 0.06	1.24 ± 0.07
10mmHg (5s)−1	1.12 ± 0.11	1.18 ± 0.06
Mean ±s.e.m.	1.15 ± 0.06	1.21 ± 0.04

Mean values (±s.e.m.) of τ are calculated from four or more measurements on at least four vessels (n > 21).One-way ANOVA revealed that there were no significant differences between values of τ at any pressure step (43 to 57cmH₂O, 57 to 71cmH₂O, or 71 to 85cmH₂O).When values of τat 12–20 °C were compared with those for the same pressure step at 0 –5 °C, there was no significant difference (t =0.869 with 88 degrees of freedom, P = 0.387).