H-reflex modulation preceding changes in soleus EMG activity during balance perturbation

Miranda, Zoé; Pham, Annie; Elgbeili, Guillaume; Barthélemy, Dorothy

doi:10.1007/s00221-018-5459-0

Cited by 12 publications

(12 citation statements)

References 58 publications

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“…Reduced H-reflex amplitudes in response to threatening scenarios is consistent with previous reports. Subjects have exhibited weaker H-reflex amplitudes in response to an increased risk ( Llewellyn et al, 1990 ; Horslen et al, 2013 ; Miranda et al, 2019 ) or consequence ( Sibley et al, 2007 ; Horslen et al, 2013 ) of a fall, as well as during alternative scenarios stimulating sympathetic arousal ( Kamibayashi et al, 2009 ; Tanaka, 2015 ). This suggests an inhibitory response at the spinal level that may be facilitated by descending commands from cortical or supraspinal structures ( Llewellyn et al, 1990 ; Adkin et al, 2008 ).…”

Section: Discussionmentioning

confidence: 99%

Visual feedback-dependent modulation of arousal, postural control, and muscle stretch reflexes assessed in real and virtual environments

Hodgson

King

Darici

et al. 2023

Front. Hum. Neurosci.

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IntroductionThe mechanisms regulating neuromuscular control of standing balance can be influenced by visual sensory feedback and arousal. Virtual reality (VR) is a cutting-edge tool for probing the neural control of balance and its dependence on visual feedback, but whether VR induces neuromodulation akin to that seen in real environments (eyes open vs. closed or ground level vs. height platform) remains unclear.MethodsHere we monitored 20 healthy young adults (mean age 23.3 ± 3.2 years; 10 females) during four conditions of quiet standing. Two real world conditions (eyes open and eyes closed; REO and REC) preceded two eyes-open virtual ‘low’ (ground level; VRL) and ‘high’ (14 m height platform; VRH) conditions. We measured arousal via electrodermal activity and psychosocial questionnaires rating perceived fear and anxiety. We recorded surface electromyography over the right soleus, medial gastrocnemius, and tibialis anterior, and performed force plate posturography. As a proxy for modulations in neural control, we assessed lower limb reflexive muscle responses evoked by tendon vibration and electrical stimulation.ResultsPhysiological and perceptual indicators of fear and anxiety increased in the VRH condition. Background soleus muscle activation was not different across conditions; however, significant increases in muscle activity were observed for medial gastrocnemius and tibialis anterior in VRH relative to REO. The mean power frequency of postural sway also increased in the VRH condition relative to REO. Finally, with a fixed stimulus level across conditions, mechanically evoked reflexes remained constant, while H-reflex amplitudes decreased in strength within virtual reality.DiscussionNotably, H-reflexes were lower in the VRL condition than REO, suggesting that these ostensibly similar visual environments produce different states of reflexive balance control. In summary, we provide novel evidence that VR can be used to modulate upright postural control, but caution that standing balance in analogous real and virtual environments may involve different neural control states.

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Section: Discussionmentioning

confidence: 99%

Visual feedback-dependent modulation of arousal, postural control, and muscle stretch reflexes assessed in real and virtual environments

Hodgson

King

Darici

et al. 2023

Front. Hum. Neurosci.

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“…Both SOL H-reflex and V-wave responses were generated at 4 different latencies: 40, 70, 100 and 130 ms from the beginning of the ankle movement. The latencies were chosen according to literature and to coincide with short latency (SLR; 30–50 ms) (Corden et al 2000 ), medium latency (MLR; 65–100 ms), long latency (LLR; ≥ 100 ms) (Miranda et al 2019 ) and voluntary responses (Taube et al 2008c ). For each latency, a set of 16 perturbations (8 anterior and 8 posterior perturbations) was performed in random order with 6–12 s intervals and a 2-min sitting break was conducted after every third set.…”

Section: Methodsmentioning

confidence: 99%

Modulation of H-reflex and V-wave responses during dynamic balance perturbations

Nevanperä

Walker

et al. 2023

Exp Brain Res

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Motoneuron excitability is possible to measure using H-reflex and V-wave responses. However, it is not known how the motor control is organized, how the H-reflex and V-wave responses modulate and how repeatable these are during dynamic balance perturbations. To assess the repeatability, 16 participants (8 men, 8 women) went through two, identical measurement sessions with ~ 48 h intervals, where maximal isometric plantar flexion (IMVC) and dynamic balance perturbations in horizontal, anterior–posterior direction were performed. Soleus muscle (SOL) neural modulation during balance perturbations were measured at 40, 70, 100 and 130 ms after ankle movement by using both H-reflex and V-wave methods. V-wave, which depicts the magnitude of efferent motoneuronal output (Bergmann et al. in JAMA 8:e77705, 2013), was significantly enhanced as early as 70 ms after the ankle movement. Both the ratio of M-wave-normalized V-wave (0.022–0.076, p < 0.001) and H-reflex (0.386–0.523, p < 0.001) increased significantly at the latency of 70 ms compared to the latency of 40 ms and remained at these levels at latter latencies. In addition, M-wave normalized V-wave/H-reflex ratio increased from 0.056 to 0.179 (p < 0.001). The repeatability of V-wave demonstrated moderate-to-substantial repeatability (ICC = 0.774–0.912) whereas the H-reflex was more variable showing fair-to-substantial repeatability (ICC = 0.581–0.855). As a conclusion, V-wave was enhanced already at 70 ms after the perturbation, which may indicate that increased activation of motoneurons occurred due to changes in descending drive. Since this is a short time-period for voluntary activity, some other, potentially subcortical responses might be involved for V-wave increment rather than voluntary drive. Our results addressed the usability and repeatability of V-wave method during dynamic conditions, which can be utilized in future studies.

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“…Both legs were evaluated. We stimulated the tibial nerve in the popliteal fossa using a 1-ms single-pulse monopolar electrical stimulation (constant-current Digitimer DS7, Digitimer Ltd HK; details provided in [ 23 ]). An H-reflex and muscular (M) response recruitment curve was constructed for all participants, without any contraction of the SOL muscle.…”

Section: Methodsmentioning

confidence: 99%

Quantitative electrophysiological assessments as predictive markers of lower limb motor recovery after spinal cord injury: a pilot study with an adaptive trial design

Huang

Meftah

Pion

et al. 2022

Spinal Cord Ser Cases

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Study design Observational, cohort study. Objectives (1) Determine the feasibility and relevance of assessing corticospinal, sensory, and spinal pathways early after traumatic spinal cord injury (SCI) in a rehabilitation setting. (2) Validate whether electrophysiological and magnetic resonance imaging (MRI) measures taken early after SCI could identify preserved neural pathways, which could then guide therapy. Setting Intensive functional rehabilitation hospital (IFR). Methods Five individuals with traumatic SCI and eight controls were recruited. The lower extremity motor score (LEMS), electrical perceptual threshold (EPT) at the S2 dermatome, soleus (SOL) H-reflex, and motor evoked potentials (MEPs) in the tibialis anterior (TA) muscle were assessed during the stay in IFR and in the chronic stage (>6 months post-SCI). Control participants were only assessed once. Feasibility criteria included the absence of adverse events, adequate experimental session duration, and complete dataset gathering. The relationship between electrophysiological data collected in IFR and LEMS in the chronic phase was studied. The admission MRI was used to calculate the maximal spinal cord compression (MSCC). Results No adverse events occurred, but a complete dataset could not be collected for all subjects due to set-up configuration limitations and time constraints. EPT measured at IFR correlated with LEMS in the chronic phases (r = −0.67), whereas SOL H/M ratio, H latency, MEPs and MSCC did not. Conclusions Adjustments are necessary to implement electrophysiological assessments in an IFR setting. Combining MRI and electrophysiological measures may lead to better assessment of neuronal deficits early after SCI.

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H-reflex modulation preceding changes in soleus EMG activity during balance perturbation

Cited by 12 publications

References 58 publications

Visual feedback-dependent modulation of arousal, postural control, and muscle stretch reflexes assessed in real and virtual environments

Visual feedback-dependent modulation of arousal, postural control, and muscle stretch reflexes assessed in real and virtual environments

Modulation of H-reflex and V-wave responses during dynamic balance perturbations

Quantitative electrophysiological assessments as predictive markers of lower limb motor recovery after spinal cord injury: a pilot study with an adaptive trial design

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