Table 2.

Correlations between EMG measures and postural control parameters (A) and correlations between the subjective estimates of fear at heights and the EMG as well as the postural control measures while standing on the balcony (B).

(A)	Soleus	Tib. Ant.	Biceps	Triceps	SCM	SSC	Leg CI	Arm CI	Neck CI
Classic CoP parameters
Range	−0.057	0.149 *	0.114	0.043	−0.051	0.067	0.216 *	−0.008	0.021
RMS	0.115	0.020	0.127	0.106	−0.001	0.036	0.090	0.019	−0.018
Area	0.102	0.032	0.143	0.124	−0.045	−0.055	0.106	0.016	−0.020
Stabilogram diffusion analysis parameters
D s	0.014	0.161 *	0.109	0.119	−0.099	−0.002	0.285 *	−0.058	−0.087
D l	0.149 *	0.012	0.031	0.150	0.053	0.097	0.044	0.054	−0.100
H s	0.098	−0.002	−0.047	0.068	−0.004	0.087	0.001	0.044	0.011
H l	0.041	−0.075	−0.053	−0.075	0.068	0.042	−0.072	0.067	−0.006
∆t c	−0.017	−0.080	−0.167*	−0.096	0.065	−0.088	−0.063	0.101	0.023
<∆r2>c	0.124	−0.021	0.143	0.062	0.034	0.009	−0.002	0.039	−0.006

(B) EMG parameters
Soleus	Tib. Ant.	Biceps	Triceps	SCM	SSC	Leg CI	Arm CI	Neck CI
−0.343*	0.371 *	0.190 *	−0.176*	0.007	−0.081	0.281 *	−0.108	0.141 *
Classic CoP and stabilogram diffusion analysis parameters
Range	RMS	Area	D s	D l	H s	H l	∆t c	<∆r2>c
0.156 *	−0.070	0.018	0.164 *	−0.063	−0.031	−0.067	−0.069	−0.138

Pearson's correlation coefficient (r). Significant correlations are marked in bold. SCM, sternocleidomastoid muscle; SSC, semispinalis capitis muscle; CI, co‐contraction index; RMS, root mean square; D_s, short‐term diffusion coefficient; D_l, long‐term diffusion coefficient; H_s, short‐term scaling exponent; H_l, long‐term scaling exponent; ∆t_c, critical time; <∆r²>_c, critical displacement.

^*A significant correlation P <0.05.