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Table 1.

Mean strain patterns of tailshaker muscles during rattling in 10 western diamondback rattlesnakes Crotalus atrox

Temperature (°C)
Increase (ratio of 30°C to 10°C) values
Variable1030
Twitch frequency (Hz) 27±4.6 64±5.3 2.4 
Muscle strain (%) 2.5±0.8 3.7±0.9 1.5 
Shortening velocity (L s-11.3±0.3 4.5±0.9 3.5 
V/Vmax 0.22±0.05 0.31±0.06 1.4 
Temperature (°C)
Increase (ratio of 30°C to 10°C) values
Variable1030
Twitch frequency (Hz) 27±4.6 64±5.3 2.4 
Muscle strain (%) 2.5±0.8 3.7±0.9 1.5 
Shortening velocity (L s-11.3±0.3 4.5±0.9 3.5 
V/Vmax 0.22±0.05 0.31±0.06 1.4 

Values are mean±S.D.

L s-1=muscle lengths per second.

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

Muscle strain and shortening velocity results are from the lateral and ventrolateral muscles only, whereas twitch frequency is from all three muscles combined.

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