Table 1.

Statistical results of Spasms and NEMG in relaxation period

Lifting Load (kg)	Spasms		NEMG(%MVC) (Mean(SD))
	Case	prevalence	Absolute (%MVC)	Normalized
0	0	0	1.05(0.21)	1.00(0.00)
15	10a**	45%a**	1.87(0.33) a**	1.78(0.09) a**
20	15a**b*	68%a**b*	2.13(0.32) a**	2.03(0.10) a**b*
25	18a**b**c*	82% a**b**c*	2.37(0.40) a**b**	2.26(0.12) a**b**c*

** P < 0.01;*P < 0.05 (a = vs. 0 kg; b = vs. 15 kg; c = vs. 20 kg). (NEMG = mean normalized EMG)