Table 2.

Comparison of elementary steps

	Myofibrils (*)	Fibres (*)	Fibres (**)	Units
K1	2.91 ± 0.31	2.35 ± 0.31	1.69 ± 0.19	mm−1
k2	288 ± 36	243 ± 22	200 ± 18	s−1
k−2	10 ± 21	6 ± 14	70 ± 11	s−1
K1k2	838 ± 138	571 ± 91	338 ± 49	mm−1s−1
Ndf	150	120	60

These parameters were measured in the presence of 8 mm P_i. ±95% confidence limits are shown. For K₁k₂, errors were propagated. N_df= degree of freedom. *Sum and product (eqns (2) and (3)) were used to deduce the kinetic constants; **eqn (16) of Kawai & Halvorson (1991) was used to deduce the kinetic constants.