TY - JOUR
T1 - Comparing the reliability of voluntary and evoked muscle actions
AU - Jenkins, Nathaniel D.M.
AU - Palmer, Ty B.
AU - Cramer, Joel T.
N1 - Publisher Copyright:
© 2013 Scandinavian Society of Clinical Physiology and Nuclear Medicine. Published by John Wiley & Sons Ltd.
PY - 2014/11/1
Y1 - 2014/11/1
N2 - Summary: Purpose: The purpose of this exploratory study was to quantify the test-retest reliability, intertrial variability and correlations between variables calculated during voluntary and evoked muscle actions. Methods: During three separate trials of isometric leg extension muscle actions with 14 men [mean age (±SD) = 21·9 (±3·2) years; height = 179·2 (±8·0) cm; mass = 77·7 (±10·9) kg], peak torque (PTV), time to peak torque (TPTV), rate of torque development (RTDV), time to peak rate of torque development (TRTDV), electromechanical delay (EMDV) and EMG amplitude (EMGRMS) were quantified for voluntary muscle actions. Peak twitch torque (PTE), time to peak twitch torque (TPTE), rate of torque development (RTDE), time to peak rate of torque development (TRTDE), electromechanical delay (EMDE), peak-to-peak M-wave (Mp-p) and M-wave area (Marea) were calculated for evoked twitches. All electromyographic measurements were recorded over the vastus lateralis. Results: Voluntary intraclass correlation coefficients (ICC) were 0·84-0·96, except for TRTDV (0·30) and EMDV (0·74). Evoked ICC were 0·80-0·95, except for EMDE (0·52). Relative standard errors of measurement for TPT and TRTD were greater for voluntary than evoked, whereas the value for PTE was greater than PTV. There were low to moderate correlations (r = -0·41-0·51) between common voluntary and evoked variables. Conclusions: Evoked variables showed lower intertrial variability than voluntary. Overall, voluntary and evoked muscle actions provide unique, complimentary information regarding neuromuscular function that cannot be used interchangeably.
AB - Summary: Purpose: The purpose of this exploratory study was to quantify the test-retest reliability, intertrial variability and correlations between variables calculated during voluntary and evoked muscle actions. Methods: During three separate trials of isometric leg extension muscle actions with 14 men [mean age (±SD) = 21·9 (±3·2) years; height = 179·2 (±8·0) cm; mass = 77·7 (±10·9) kg], peak torque (PTV), time to peak torque (TPTV), rate of torque development (RTDV), time to peak rate of torque development (TRTDV), electromechanical delay (EMDV) and EMG amplitude (EMGRMS) were quantified for voluntary muscle actions. Peak twitch torque (PTE), time to peak twitch torque (TPTE), rate of torque development (RTDE), time to peak rate of torque development (TRTDE), electromechanical delay (EMDE), peak-to-peak M-wave (Mp-p) and M-wave area (Marea) were calculated for evoked twitches. All electromyographic measurements were recorded over the vastus lateralis. Results: Voluntary intraclass correlation coefficients (ICC) were 0·84-0·96, except for TRTDV (0·30) and EMDV (0·74). Evoked ICC were 0·80-0·95, except for EMDE (0·52). Relative standard errors of measurement for TPT and TRTD were greater for voluntary than evoked, whereas the value for PTE was greater than PTV. There were low to moderate correlations (r = -0·41-0·51) between common voluntary and evoked variables. Conclusions: Evoked variables showed lower intertrial variability than voluntary. Overall, voluntary and evoked muscle actions provide unique, complimentary information regarding neuromuscular function that cannot be used interchangeably.
KW - Electrical stimulation
KW - Isometric muscle actions
KW - Minimum difference
KW - Neuromuscular testing
KW - Test-retest reliability
KW - Variability
UR - http://www.scopus.com/inward/record.url?scp=84907954396&partnerID=8YFLogxK
U2 - 10.1111/cpf.12113
DO - 10.1111/cpf.12113
M3 - Article
C2 - 24299239
AN - SCOPUS:84907954396
SN - 1475-0961
VL - 34
SP - 434
EP - 441
JO - Clinical Physiology and Functional Imaging
JF - Clinical Physiology and Functional Imaging
IS - 6
ER -