Electromyographic latency of postural evoked responses from the leg muscles during EquiTest Computerised Dynamic Posturography: Reference data on healthy subjects.
No normative data are available for the latencies of the EMG signals from the ankle muscles in response to sudden sagittal tilt (toes-UP or toes-DOWN) or shift (shift-FOR or shift-BACK) of the support surface during standing. In this study the postural evoked response (PER) paradigm on the EquiTest™ force platform was applied to 31 healthy adults (18 women and 13 men; mean age 29 years). The EMG latencies (PEREMG) were computed both through the standard manual procedure and through a specially designed automated algorithm. The manually computed PEREMG onset yielded a 95% tolerance interval between 82ms and 148ms after toes-UP perturbation, between 93ms and 182ms after toes-DOWN perturbation, between 67ms and 107ms after shift-BACK perturbation, and between 73ms and 113ms after shift-FOR perturbation. When comparing the two methods, paired t-tests showed no significant mean difference (Bonferroni-adjusted p-values ranged from 0.440 to 1.000) and all Bland-Altman plots included zero difference within the limits of agreement. Therefore, the manual and the automated methods appear to be sufficiently consistent. These results foster the clinical application of PEREMG testing on the EquiTest platform.
Rehabilitation Medicine, Department of Biomedical Sciences for Health, Università degli Studi, Milano, Italy; Department of Neurorehabilitation Sciences, Istituto Auxologico Italiano-IRCCS, Milano, Italy.
Laura
L
Perucca
School of Specialisation, Physical and Rehabilitation Medicine, Università degli Studi, Milano, Italy. Electronic address: antonio.caronni@unimi.it.
Antonio
A
Caronni
University Rehabilitation Institute, Republic of Slovenia, Ljubljana, Slovenia; University of Ljubljana, Faculty of Medicine, Institute for Biostatistics and Medical Informatics, Ljubljana, Slovenia.
Gaj
G
Vidmar
Rehabilitation Medicine, Department of Biomedical Sciences for Health, Università degli Studi, Milano, Italy; Department of Neurorehabilitation Sciences, Istituto Auxologico Italiano-IRCCS, Milano, Italy.
Luigi
L
Tesio
D000328:Adult; D000465:Algorithms; D000704:Analysis of Variance; D004576:Electromyography; D019054:Evoked Potentials, Motor / Q000502:physiology*; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D007866:Leg / Q000502:physiology*; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D012016:Reference Values
EMG; EquiTest; Human; Normative data; Postural evoked responses; Posture