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Bogey, Ross A.; Cerny, Kay; Mohammed, Olfat

doi:10.1097/00002060-200305000-00002

Cited by 7 publications

(8 citation statements)

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“…However, the reservations related to generalizing the wire EMG data to the entire muscle – at least in neurologically-intact individuals – are unfounded. Previous work has shown that when the wire EMG signal has been normalized to a reference standard (in this case, a maximum muscle test) there were no significant differences in the wire and surface EMG signal timing or magnitude [ 15 ]. Although surface electrodes could have been used to record data from superficial muscles they could not have been used to record EMG from many of the deep muscles examined here.…”

Section: Discussionmentioning

confidence: 99%

“…Due to the comprehensive number of muscles examined each study participant performed two self-selected speed walking trials, with data selected from each trial. In normal adults the examined gait parameters are highly consistent across trials [ 15 ], and the use of multiple sessions did not confound the results. The mean gait velocity for these subjects was 81.9 ± 3.7 m per minute.…”

Section: Methods (Overview)mentioning

confidence: 99%

“…Gait data acquisition and processing steps used in this study have been described in greater detail elsewhere [ 15 ]. The primary focus of this analysis was the power generated at the hip through the entire gait cycle.…”

Section: Methods (Overview)mentioning

confidence: 99%

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Estimates of individual muscle power production in normal adult walking

Bogey

Barnes

2017

J NeuroEngineering Rehabil

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BackgroundThe purpose of this study was to determine the contribution of individual hip muscles to the net hip power in normal adult self-selected speed walking. A further goal was to examine each muscle’s role in propulsion or support of the body during that task.MethodsAn EMG-to-force processing (EFP) model was developed which scaled muscle-tendon unit (MTU) force output to gait EMG. Active muscle power was defined as the product of MTU forces (derived from EFP) and that muscle’s contraction velocity. Passive hip power was estimated from passive moments associates with hip position (angle of flexion (extension)) and the hip’s angular velocity. Net hip EFP power was determined by summing individual active hip muscle power plus the net passive hip power at each percent gait cycle interval. Net hip power was also calculated for these study participants via inverse dynamics (kinetics plus kinematics, KIN). The inverse dynamics technique – well accepted in the biomechanics literature – was used as a “gold standard” for validation of this EFP model. Closeness of fit of the power curves of the two methods was used to validate the model.ResultsThe correlation between the EFP and KIN methods was sufficiently close, suggesting validation of the model’s ability to provide reasonable estimates of power produced by individual hip muscles. Key findings were that (1) most muscles undergo a stretch-shorten cycle of muscle contraction, (2) greatest power was produced by the hip abductors, and (3) the hip adductors contribute to either hip adduction or hip extension (but not both).ConclusionsThe EMG-to-force processing approach provides reasonable estimates of individual hip muscle forces in self-selected speed walking in neurologically-intact adults.

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Section: Discussionmentioning

confidence: 99%

Section: Methods (Overview)mentioning

confidence: 99%

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Estimates of individual muscle power production in normal adult walking

Bogey

Barnes

2017

J NeuroEngineering Rehabil

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“…All EMG data were subject to a root mean squared moving average of 25 ms. EMG data were normalized to maximum voluntary isometric contractions (MVICs); three MVICs were recorded for each muscle following the completion of walking trials. The MVIC data were recorded for 5 s with a gradual build-up of 2 s prior to maximal effort for the final 3 s. The peak value from a 0.5-s window obtained from the 3-s maximal effort of the MVIC was used as the reference value, similar to the methods reported elsewhere [14, 16]. All participants were verbally encouraged in a standard manner during the MVICs and a 1-min recovery period was set between repetitions.…”

Section: Methodsmentioning

confidence: 99%

Kinematic, kinetic and electromyographic response to customized foot orthoses in patients with tibialis posterior tenosynovitis, pes plano valgus and rheumatoid arthritis

et al. 2013

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Objective. To describe the effect of customized foot orthoses (FOs) on the kinematic, kinetic and EMG features in patients with RA, tibialis posterior (TP) tenosynovitis and associated pes plano valgus.Methods. Patients with RA and US-confirmed tenosynovitis of TP underwent gait analysis, including three-dimensional (3D) kinematics, kinetics, intramuscular EMG of TP and surface EMG of tibialis anterior, peroneus longus, soleus and medial gastrocnemius. Findings were compared between barefoot and shod with customized FO conditions.Results. Ten patients with RA with a median (range) disease duration of 3 (1–18) years were recruited. Moderate levels of foot pain and foot-related impairment and disability were present with moderately active disease states. Altered timing of the soleus (P = 0.05) and medial gastrocnemius (P = 0.02) and increased magnitude of tibialis anterior (P = 0.03) were noted when barefoot was compared with shod with FO. Trends were noted for reduced TP activity in the contact period (P = 0.09), but this did not achieve statistical significance. Differences in foot motion characteristics were recorded for peak rearfoot eversion (P = 0.01), peak rearfoot plantarflexion (P < 0.001) and peak forefoot abduction (P = 0.02) in the shod with FOs compared with barefoot conditions. No differences in kinetic variables were recorded.Conclusion. This study has demonstrated, for the first time, alterations in muscle activation profiles and foot motion characteristics in patients with RA, pes plano valgus and US-confirmed TP tenosynovitis in response to customized FOs. Complex adaptations were evident in this cohort and further work is required to determine whether these functional alterations lead to improvements in patient symptoms.

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“…EMG data was normalised to maximum voluntary isometric contractions (MVIC); three MVICs were recorded for each muscle following completion of walking trials. The MVIC data was recorded against manual resistance for 5 s with a gradual build up of 2 s prior to maximal effort for the final 3 s. The peak value from a 500 ms window obtained from the 3-s maximal effort of the MVIC was used as the reference value similar to the methods used by Bogey et al [17] and Murley et al [18]. All participants were verbally encouraged in a standard manner during the MVICs and a 1-min recovery period was set between repetitions.…”

Section: Methodsmentioning

confidence: 99%

Reliability study of tibialis posterior and selected leg muscle EMG and multi-segment foot kinematics in rheumatoid arthritis associated pes planovalgus

Barn¹,

Rafferty²,

Turner³

et al. 2012

Gait & Posture

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Highlights► We use ultrasound to guide fine wires into tibialis posterior and record EMG signal. ► We simultaneously recorded EMG and multi-segment foot kinematics. ► We examine reliability over time in flat footed rheumatoid arthritis patients. ► Between-day reliability of discrete EMG variables is questionable. ► Within- and between-day reliability of kinematic variables were acceptable.

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Abstract: The study results show that the dynamic electromyographic signal obtained with wire electrodes is, at minimum, as repeatable as surface electromyograms.

Cited by 7 publications

References 0 publications

Estimates of individual muscle power production in normal adult walking

Estimates of individual muscle power production in normal adult walking

Kinematic, kinetic and electromyographic response to customized foot orthoses in patients with tibialis posterior tenosynovitis, pes plano valgus and rheumatoid arthritis

Reliability study of tibialis posterior and selected leg muscle EMG and multi-segment foot kinematics in rheumatoid arthritis associated pes planovalgus

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