TY - JOUR
T1 - Between-day reliability of triceps surae responses to standing perturbations in people post-stroke and healthy controls
T2 - a high-density surface EMG investigation
AU - Gallina, A.
AU - Pollock, C.L.
AU - Vieira, T.M.
AU - Ivanova, T.D.
AU - Garland, S.J.
PY - 2016/2/1
Y1 - 2016/2/1
N2 - The reliability of triceps surae electromyographic responses to standing perturbations in people after stroke and healthy controls is unknown. High-Density surface Electromyography (HDsEMG) is a technique that records electromyographic signals from different locations over a muscle, overcoming limitations of traditional surface EMG such as between-day differences in electrode placement. In this study, HDsEMG was used to measure responses from soleus (SOL, 18 channels) and medial and lateral gastrocnemius (MG and LG, 16 channels each) in 10 people after stroke and 10 controls. Timing and amplitude of the response were estimated for each channel of the grids. Intraclass Correlation Coefficient (ICC) and normalized Standard Error of Measurement (SEM%) were calculated for each channel individually (single-channel configuration) and on the median of each grid (all-channels configuration). Both timing (single-channel: ICC = 0.75–0.96, SEM% = 5.0–9.1; all-channels: ICC = 0.85–0.97; SEM% = 3.5–6.2%) and amplitude (single-channel: ICC = 0.60–0.91, SEM% = 25.1–46.6; ICC = 0.73–0.95, SEM% = 19.3–42.1) showed good-to-excellent reliability. HDsEMG provides reliable estimates of EMG responses to perturbations both in individuals after stroke and in healthy controls; reliability was marginally better for the all-channels compared to the single-channel configuration.
AB - The reliability of triceps surae electromyographic responses to standing perturbations in people after stroke and healthy controls is unknown. High-Density surface Electromyography (HDsEMG) is a technique that records electromyographic signals from different locations over a muscle, overcoming limitations of traditional surface EMG such as between-day differences in electrode placement. In this study, HDsEMG was used to measure responses from soleus (SOL, 18 channels) and medial and lateral gastrocnemius (MG and LG, 16 channels each) in 10 people after stroke and 10 controls. Timing and amplitude of the response were estimated for each channel of the grids. Intraclass Correlation Coefficient (ICC) and normalized Standard Error of Measurement (SEM%) were calculated for each channel individually (single-channel configuration) and on the median of each grid (all-channels configuration). Both timing (single-channel: ICC = 0.75–0.96, SEM% = 5.0–9.1; all-channels: ICC = 0.85–0.97; SEM% = 3.5–6.2%) and amplitude (single-channel: ICC = 0.60–0.91, SEM% = 25.1–46.6; ICC = 0.73–0.95, SEM% = 19.3–42.1) showed good-to-excellent reliability. HDsEMG provides reliable estimates of EMG responses to perturbations both in individuals after stroke and in healthy controls; reliability was marginally better for the all-channels compared to the single-channel configuration.
U2 - 10.1016/j.gaitpost.2015.11.015
DO - 10.1016/j.gaitpost.2015.11.015
M3 - Article
SN - 0966-6362
VL - 44
SP - 103
EP - 109
JO - Gait and Posture
JF - Gait and Posture
ER -