Skeletal muscle contraction. The thorough definition of the contractile event requires both load acceleration and load mass to be known

Table 1 The velocity of contraction and the ATPase rate constant as a function of the load

P/P₀	Contraction velocity, v_vnm.s^-1.hsl^-1	ATPase rate constant, s^-1
0.00526316	1610.48	18.1578
0.0526316	1380.07	17.5316
0.105263	1172.8	16.8363
0.157895	1003.28	16.1415
0.210526	862.062	15.4473
0.263158	742.604	14.7537
0.315789	640.236	14.0606
0.368421	551.535	13.3681
0.421053	473.936	12.6761
0.473684	405.477	11.9846
0.526316	344.633	11.2937
0.578947	290.2	10.6034
0.631579	241.216	9.91354
0.684211	196.902	9.22426
0.736842	156.62	8.53553
0.789474	119.843	7.84735
0.842105	86.1343	7.1597
0.894737	55.1241	6.47259
0.947368	26.5012	5.78603

In He et al. [3] the velocity of contraction, V, number of fiber length per second (ML/s), is calculated by the equation: V = b (P₀ - P)/(P+a), Fig. 6 of He et al. [3], where P₀ = 190 kN.m^-2; a/P₀ = 0.42; b = 0.51. In this work the velocity of contraction was expressed in nm per second per half sarcomere: v_v = hsl. ML.s^-1, where hsl = 1350 nm. The ATPase constant was calculated from the equation, ATPase rate constant (s^-1) = 5.1 + (18.7 × 1.94 × V)/(1+1.94 × V) where, V, is the applied shortening velocity (ML.s^-1), 5.1 s^-1 is the ATPase rate constant in the isometric state, 18.7 s^-1 is the ATPase rate constant for shortening at infinite velocity [3].

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