Mechanical properties of the adductor superficialis and abductor profundus muscles of bluegill sunfish
| . | Muscle . | . | . | |
|---|---|---|---|---|
| Mechanical property . | Abductor superficialis . | Adductor profundus . | P (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–2) | 179±6 | 183±7 | 0.35 | |
| Optimum sinusoidal strain ± proportion of L0. | 0.18±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 property . | Abductor superficialis . | Adductor profundus . | P (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–2) | 179±6 | 183±7 | 0.35 | |
| Optimum sinusoidal strain ± proportion of L0. | 0.18±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