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Figure 3 | Journal of NeuroEngineering and Rehabilitation

Figure 3

From: Augmented visual feedback counteracts the effects of surface muscular functional electrical stimulation on physiological tremor

Figure 3

Tremor parameters. Box and whisker plots of peak frequencies (left panels), maximal power spectral density (maxPSD; middle left panels), RMS (root mean square; middle right panels), integral of the frequency band 8-12Hz (right panels) for composite data. Tremor recorded at the index finger (accelerometer 1) in the 4 conditions, during tasks H (Top panels) and A (Bottom panels). Continuous line: median; dashed line: mean values. Outliers: 5th and 95th percentiles. N = 10 subjects. Frequency peak: no significant changes. maxPSD: values in the condition HSTINL are significantly lower as compared to the 3 other conditions (**: p = 0.005); values in ASTINL are significantly lower than values in ANSL (*: p < 0.05) and in ASTIL (**: p < 0.01). RMS: in H, the lowest values occur in HSTINL (as compared to the 3 other conditions; **: inter-group difference p < 0.001); in A, values are significantly lower in ASTINL as compared to ANSL and ASTIL (*: p < 0.05). Integral 8-12Hz: in H, the lowest values are found in HSTINL (as compared to the 3 other conditions; **: inter-group difference p < 0.001); in A, values are significantly lower in ASTINL as compared to ANSNL and ANSL (*: p < 0.05). Frequencies are expressed in Hz; maxPSD, RMS and integrals of subbands are expressed in arbitrary units (a.u.).

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