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Table 2.

Isometric mechanical properties of fibre bundle preparations of transverse muscle mass of tentacle and arm of Loligo pealei

TentacleArm
P0 (mN mm-2130.9±55.6 (12) 468.3±91.2 (5) 
Ptw/P0 0.66±0.06 (10) 0.03±0.02 (10) 
TPT (ms) 33.6±3.0 (28) 59.6±10.2 (17) 
RT50 (ms) 52.7±7.3 (28) 153.4±65.9 (17) 
TentacleArm
P0 (mN mm-2130.9±55.6 (12) 468.3±91.2 (5) 
Ptw/P0 0.66±0.06 (10) 0.03±0.02 (10) 
TPT (ms) 33.6±3.0 (28) 59.6±10.2 (17) 
RT50 (ms) 52.7±7.3 (28) 153.4±65.9 (17) 

Values are means±S.D. (N).

P0 is the peak force in a brief tetanus (0.2 s stimulation at 80 Hz for the tentacle and 160 Hz for the arm, the stimulus frequencies that showed the highest force for each type); Ptw/P0 is the twitch:tetanus force ratio; TPT is the time from onset of stimulation to development of maximum force during a twitch; RT50 is half-relaxation time from maximum force during a twitch.

Note that P0 is biased low, especially for the arm preparations (see Discussion).

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