Quantitative Electromyographic Analysis of Reaction Time to External Auditory Stimuli in Drug-Naïve Parkinson’s Disease

Table 2

Spearman’s correlation coefficient between EMG reaction time parameters with clinically measured data by UPDRS part III scores.

		Spearman’s correlation coefficient; between RT and UPDRS part III motor scores
		More-affected side			Less-affected side
		Wrist flexor	Wrist extensor	Ankle flexor	Wrist flexor	Wrist extensor	Ankle flexor
RTi	Sum of UPDRS III	0.382*	0.407*	0.440*	0.472**	0.314	0.371*
	Bradykinesia	0.312	0.497*	0.338	0.377*	0.363*	0.215
	Rigidity	0.043	0.120	0.327	0.566**	0.291	0.306
	Tremor	0.367	0.070	0.444*	0.439*	0.351	0.397*
RTt	Sum of UPDRS III	0.392*	0.462**	0.640**	0.524**	0.417*	0.470**
	Bradykinesia	0.428*	0.261	0.530*	0.373*	0.446**	0.375*
	Rigidity	0.383*	0.459*	0.216	0.474**	0.434**	0.375*
	Tremor	0.122	0.103	0.362*	0.142	0.283	0.230

∗The mean difference is significant at the 0.05 level.
**The mean difference is significant at the 0.01 level.
UPDRS: Unified Parkinson’s Disease Rating Scale; UPDRS part III: sum of motor part score of UPDRS; RTi: reaction time (initiation delay of muscle contraction); RTt: reaction time (termination delay of muscle contraction).