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Table 2.

Regression results for changes in lateral and ventrolateral tailshaker muscle strain with increasing twitch frequency in western diamondback rattlesnakes Crotalus atrox

Muscle strain (%)Shortening velocity (L s-1)V/Vmax
Frequency slope 0.03** 0.08** 0.002** 
Muscle mass slope 0.21* 0.18** 0.01** 
Intercept 0.52 -2.1** 0.09* 
Adjusted r2 0.38 0.77 0.38 
Overall F 9.9** 50.6** 9.9** 
Muscle strain (%)Shortening velocity (L s-1)V/Vmax
Frequency slope 0.03** 0.08** 0.002** 
Muscle mass slope 0.21* 0.18** 0.01** 
Intercept 0.52 -2.1** 0.09* 
Adjusted r2 0.38 0.77 0.38 
Overall F 9.9** 50.6** 9.9** 

Slope values for independent variables are unstandardised partial regression coefficients.

L s-1=muscle lengths per second.

V/Vmax=ratio of actual to maximum shortening velocity; Vmax taken from Rome et al.(1996).

N=30.

Each slope indicates the bivariate relationship between the dependent variable and the particular independent variable when the other independent variable is held constant at the mean. For example, when muscle mass is held constant, contraction frequency significantly affects muscle strain with a slope of 0.03.

*

Significant at P<0.05.

**

Significant at P<0.01.

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