Estimating total maximum isometric force output of trunk and hip muscles after spinal cord injury

Bheemreddy, Akhil; Friederich, Aidan R. W.; Lombardo, Lisa M.; Triolo, Ronald J.; Audu, Musa L.

doi:10.1007/s11517-020-02120-0

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…For instance, by pairing electrical muscle stimulation with auditory stimuli during normal daily activities for ~6 h, work has shown improved reaction time and enhanced motor responses elicited by a TMS-induced AP current, but not by the PA current in healthy adults (Germann and Baker, 2021 ), suggesting targeted neuroplasticity induced by the paired stimulation. There are a range of interventions available for trunk rehabilitation from conventional activity-based exercise (Eginyan et al, 2021 ) and electrical muscle stimulation (Bheemreddy et al, 2020 ) to innovative transcutaneous spinal cord stimulation (Roberts et al, 2021 ). Further research is required to determine the effect of therapeutic modalities on corticospinal neurons generating early and late I-waves projecting to the trunk muscles to better inform targeted treatment for individuals.…”

Section: Discussionmentioning

confidence: 99%

Influence of coil orientation on corticospinal excitability of trunk muscles during postural and volitional tasks in healthy adults

Nemdharry

Cancino

et al. 2023

Front. Hum. Neurosci.

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IntroductionTrunk muscles play a role in maintaining postural stability and performing goal-directed voluntary movements in activities of daily living. Evidence has shown that the primary motor cortex (M1) is involved in modulation of postural control and voluntary movements of the trunk. However, it remains unknown whether the neural circuits within the M1 were recruited to the same extent between a postural task and a goal-directed voluntary task.MethodsTo address this, we examined latencies and amplitudes of motor evoked potentials (MEPs) of the erector spinae (ES) with transcranial magnetic stimulation (TMS) figure-of-eight coil oriented to induce latero-medial (LM), posterior-anterior (PA), and anterior-posterior (AP) currents in the M1 in twenty healthy participants during a dynamic shoulder flexion (DSF) task, a postural task requiring anticipatory postural adjustments (APAs), and during a static trunk extension (STE) task, a voluntary task without involvement of APAs.ResultsWe found that differences in the AP-LM latency of ES MEP were longer compared with the PA-LM latency in both tasks. Corticospinal excitability was overall greater during the DSF task than during the STE task irrespective of the coil orientation.DiscussionOur findings suggest that while the same neural circuits in the M1 were recruited to modulate both postural and voluntary control of the trunk, the contribution was greater to the postural task than the voluntary task, possibly due to the requirement of APAs in the task.

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Section: Discussionmentioning

confidence: 99%

Influence of coil orientation on corticospinal excitability of trunk muscles during postural and volitional tasks in healthy adults

Nemdharry

Cancino

et al. 2023

Front. Hum. Neurosci.

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“…These values are slightly lower than those predicted for the upright posture by Lambrecht et al (41) FNS is often limited by the contractile strength of the paralyzed muscles and the number of muscle fibers available for recruitment. Maximum isometric force of paralyzed muscles is estimated to be 30%-75% of able bodied (42,43) and neuroprostheses can only activate a limited number of muscle groups with the available stimulation channels. Forward leaning was successful in all subjects because the majority of channels available produced strong extension moments (Figures 7B,D,F), however lateral leaning postures were more difficult to sustain because of the reduced number of channels that produced moments in the medial-lateral direction.…”

Section: Discussionmentioning

confidence: 99%

Stabilizing leaning postures with feedback controlled functional neuromuscular stimulation after trunk paralysis

Friederich,

Lombardo,

Foglyano

et al. 2023

Front. Rehabil. Sci.

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Spinal cord injury (SCI) can cause paralysis of trunk and hip musculature that negatively impacts seated balance and ability to lean away from an upright posture and interact fully with the environment. Constant levels of electrical stimulation of peripheral nerves can activate typically paralyzed muscles and aid in maintaining a single upright seated posture. However, in the absence of a feedback controller, such seated postures and leaning motions are inherently unstable and unable to respond to perturbations. Three individuals with motor complete SCI who had previously received a neuroprosthesis capable of activating the hip and trunk musculature volunteered for this study. Subject-specific muscle synergies were identified through system identification of the lumbar moments produced via neural stimulation. Synergy-based calculations determined the real-time stimulation parameters required to assume leaning postures. When combined with a proportional, integral, derivative (PID) feedback controller and an accelerometer to infer trunk orientation, all individuals were able to assume non-erect postures of 30–40° flexion and 15° lateral bending. Leaning postures increased forward reaching capabilities by 10.2, 46.7, and 16 cm respectively for each subject when compared with no stimulation. Additionally, the leaning controllers were able to resist perturbations of up to 90 N, and all subjects perceived the leaning postures as moderately to very stable. Implementation of leaning controllers for neuroprostheses have the potential of expanding workspaces, increasing independence, and facilitating activities of daily living for individuals with paralysis.

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“…Maximum isometric force is defined as the peak force a muscle can produce while maintaining a constant length. The common method for estimating an individual muscle's maximum isometric force is to multiply the physiological cross-sectional area (PCSA) with the specific tension [42]. However, directly estimating the maximum isometric force experimentally could be very challenging and resource-demanding.…”

Section: B Estimated Muscle-tendon Parametersmentioning

confidence: 99%

EMG-Constrained and Ultrasound-Informed Muscle-Tendon Parameter Estimation in Post-Stroke Hemiparesis

Zhang,

Van Wouwe,

Yan

et al. 2024

IEEE Trans. Biomed. Eng.

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Secondary morphological and mechanical property changes in the muscle-tendon unit at the ankle joint are often observed in post-stroke individuals. These changes may alter the force generation capacity and affect daily activities such as locomotion. This work aimed to estimate subject-specific muscle-tendon parameters in individuals after stroke by solving the muscle redundancy problem using direct collocation optimal control methods based on experimental electromyography (EMG) signals and measured muscle fiber length. Subject-specific muscle-tendon parameters of the gastrocnemius, soleus, and tibialis anterior were estimated in seven post-stroke individuals and seven healthy controls. We found that the maximum isometric force, tendon stiffness and optimal fiber length in the post-stroke group were considerably lower than in the control group. We also computed the root mean square error between estimated and experimental values of muscle excitation and fiber length. The musculoskeletal model with estimated subject-specific muscle tendon parameters (from the muscle redundancy solver), yielded better muscle excitation and fiber length estimations than did scaled generic parameters. Our findings also showed that the muscle redundancy solver can estimate muscle-tendon parameters that produce force behavior in better accordance with the experimentally-measured value. These muscle-tendon parameters in the post-stroke individuals were physiologically meaningful and may shed light on treatment and/or rehabilitation planning.

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Estimating total maximum isometric force output of trunk and hip muscles after spinal cord injury

Cited by 6 publications

References 29 publications

Influence of coil orientation on corticospinal excitability of trunk muscles during postural and volitional tasks in healthy adults

Influence of coil orientation on corticospinal excitability of trunk muscles during postural and volitional tasks in healthy adults

Stabilizing leaning postures with feedback controlled functional neuromuscular stimulation after trunk paralysis

EMG-Constrained and Ultrasound-Informed Muscle-Tendon Parameter Estimation in Post-Stroke Hemiparesis

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