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Fig. 7. A statistical model explaining the relationships of all measured muscle
performance parameters in relation to muscle power output. (A) Path diagram
summarizing the results from three separate multiple regression tests. Arrows
pointing from each independent variable to a dependent variable represent
relationships revealed by one multiple regression test. Colored arrowheads
identify the three separate tests. Test 1: cycle power vs cycle work
and cycle duration (blue); Test 2: cycle work vs peak stress and
strain amplitude (red); Test 3: peak stress vs EMG intensity and EMG
duty cycle (green). Black numbers above the arrows are path coefficients and
red numbers below the arrows are partial coefficients of determination
(r2=path coefficient x partial correlation
coefficient) describing the fractional variance explained by each covariate.
Values are mean ± s.d. for all frogs that demonstrated a significant
correlation (P
0.05). (B) Reduced path diagram summarizing data
from a single frog (frog 5) indicates that four primary performance parameters
(cycle duration, EMG intensity, EMG duty cycle and strain amplitude) explain
approximately 76% of the variance in plantaris power. Black numbers represent
path coefficients and red numbers partial coefficients of determination; these
are given for each individual frog in Table
3. Independent variables that did not significantly contribute to
the regression model (P>0.05) are not included in the average
values shown on the path diagrams.
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