Table 1.

Time course of clenbuterol-induced phenotype shift in EDL and SOL muscles

		EDL				SOL
		CTL-G21	CB-G9	CB-G14	CB-G21	CTL-G21	CB-G9	CB-G14	CB-G21
Fibre types	I	7.5 ± 2.2	7.3 ± 2.6	7.6 ± 2.8	5.4 ± 1.4	80.0 ± 7.4	72.0 ± 8.3	69.4 ± 9.5*	60.7 ± 8.5***
(%)	IIa	25.6 ± 1.9	14.7 ± 4.3*	9.9 ± 2.4**	11.0 ± 3.7**	14.8 ± 8.5	16.9 ± 8.4	20.4 ± 9.7	29.1 ± 10**
	IIx-IIb	66.9 ± 2.7	78.0 ± 4.3*	82.4 ± 3.1**	83.6 ± 4.7**	5.3 ± 3.6	11.1 ± 1.8*	10.2 ± 2.8*	10.2 ± 6.8*

Values are mean percentages (± SD, n = 8) of the different fibre types in EDL and SOL. ^*Different from CTL-G21; ^**different from CTL-G21 and CB-G9; ^***different from CTL-G21, CB-G9 and CB-G14. P < 0.05. Because non-statistically differences exist between CTL-G9, CTL-G14 and CTL-G21 groups for both fibre type distribution and CSA, results of the CTL-G21 group only are given.