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Table 1.

Mechanical properties of the adductor superficialis and abductor profundus muscles of bluegill sunfish

Muscle
Mechanical propertyAbductor superficialisAdductor profundusP (t-test)
Twitch rise time (ms) 42.8±6.5 (6) 56.3±7.2 0.19 
Time from peak twitch force to 90% relaxation (ms) 121.5±21.4 138.3±27.8 0.64 
Twitch:tetanus ratio 0.39±0.01 0.40±0.03 0.76 
Maximum isometric tetanic stress (kN m–2179±6 183±7 0.35 
Optimum sinusoidal strain ± proportion of L00.18±0.01 0.18±0.02 0.58 
Optimum stimulus duty cycle (proportion of cycle duration) 0.43±0.01 0.41±0.01 0.22 
Optimum stimulus onset phase (proportion of cycle before maximum length) 0.11±0.01 0.11±0.01 0.63 
Muscle
Mechanical propertyAbductor superficialisAdductor profundusP (t-test)
Twitch rise time (ms) 42.8±6.5 (6) 56.3±7.2 0.19 
Time from peak twitch force to 90% relaxation (ms) 121.5±21.4 138.3±27.8 0.64 
Twitch:tetanus ratio 0.39±0.01 0.40±0.03 0.76 
Maximum isometric tetanic stress (kN m–2179±6 183±7 0.35 
Optimum sinusoidal strain ± proportion of L00.18±0.01 0.18±0.02 0.58 
Optimum stimulus duty cycle (proportion of cycle duration) 0.43±0.01 0.41±0.01 0.22 
Optimum stimulus onset phase (proportion of cycle before maximum length) 0.11±0.01 0.11±0.01 0.63 

Values are means ± s.e.m., N=6. P-values are from an unpaired t-test comparing the mean values for each muscle,d.f.=10

L0, muscle length at which maximum isometric, tetanic stress was produced

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