27
In the first series of experiments, analysis of
variance for repeated measures (8) on the ratios
between O2 uptake and developed tension observed before
and after fatigue revealed no significant difference
(p>.25). Table I shows the O2 uptake and developed
tension for each of the muscles both before and after
fatigue.
The results of the O2 uptake and developed tension
measurements in series 2-5 are summarized in Table II
and illustrated in Figures 3 and 4. Table II shows the
linear regression equations relating O2 uptake and
developed tension for each experiment. These equations
were calculated from data which included values from
the fatigued muscle as well as the fresh muscle. The
slopes of all but one (Experiment 8, p=.09) of the lines
are significantly different from zero (p<.05), despite
the small number of points used to determine each
regression equation. It is obvious from Figure 3 and
Table II that there was considerable variability between
animals. This has always been observed in this preparation
(27, 57, 66). However, despite differences in absolute
values between different animals, the same pattern of
response was observed in all cases. VO2 per contraction
and AT were directly related.
Results of four sample experiments from series 2-5
are shown in Figure 3. Figure 4 shows that all of the