TABLE 2.

Difference in the effect of prolonged vibration between older and young men.

Cohen’s d		90% confidence interval
Maximal strength variables
MVC torque	1.03*	0.41 to 1.70
RMS-EMG of MG	0.42*	−0.20 to 1.00
RMS-EMG of TA	0.06	−0.56 to 0.68
VA%	0.76*	0.14 to 1.40
V-wave of MG	0.33	−0.37 to 1.00
V-wave of SOL	0.44	−0.21 to 1.10
Explosive strength variables
RTD	0.75*	0.13 to 1.40
RMS-EMG of MG	0.78*	0.16 to 1.40
Balance performance variables
COP speed	0.62*	−0.03 to 1.30
RMS-EMG of MG	0.59*	−0.07 to 1.30
RMS-EMG of LG	0.69*	0.03 to 1.30
RMS-EMG of SOL	0.06	−0.58 to 0.71
RMS-EMG of TA	0.06	−0.58 to 0.71

*Indicates that the effect of prolonged vibration was substantially different between older and young men. COP, center of pressure; LG, lateral gastrocnemius; MG, medial gastrocnemius; MVC, maximal voluntary contraction; RMS-EMG, root mean square; RTD, rate of torque development; SOL, soleus; TA, tibialis anterior; VA%, voluntary activation.