Inhibition of soleus Hoffmann reflex by ankle–foot orthosis application in healthy volunteers

Larsen, Lars Emil; Jakobsen, Lydia Anja; Jensen, Anne; Lambden, Benjamin M.; Sørensen, Morten R; Ellrich, Jens

doi:10.1177/0309364614535621

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…The generally given explanation is that HS boots or external ankle supports provide additional tactile information around the ankle and the lower part of the leg, which improves somatosensation and postural stability, with a main influence in the frontal plane. Larsen et al (2015) showed that the increased cutaneous afference information provided by the application of an ankle foot orthosis could depress the soleus H reflex and facilitate the motor function of the tibialis anterior muscle. Cordova and Ingersoll (2003) reported concordant findings while observing greater stretch reflex amplitude of the peroneus longus muscle after acute ankle brace application.…”

Section: Unstable Postural Tasksmentioning

confidence: 99%

Ski Boots Do Not Impair Standing Balance by Restricting Ankle-Joint Mobility

et al. 2018

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Objective: This study was undertaken in order to provide new insight into sensorimotor control of posture when wearing high-shaft (HS) boots as ski boots. Background: Previous studies into the effects of HS boots on postural control have produced controversial results. Some studies reported postural control impairments with ski boots in bipedal postural tasks due to ankle movement restrictions without quantifying the actual restrictive effect of these boots and specifying the adaptations of the postural control system. Method: Eighteen young healthy subjects took part in the experiment. Bilateral postural control was assessed on stable and unstable surfaces, while standing barefoot or wearing ski boots. Center of pressure (COP) parameters, ankle, knee, and hip joints movements were calculated and EMG activity from main postural muscles was recorded. Results: Ski boots did not restrict the amplitude of ankle angular movements and largely impacted COP parameters and EMG activity on stable ground. In conditions of mediolateral instability, COP data illustrated an enhanced postural control in the frontal plane when wearing ski boots. Conclusions: Ski boots do not affect bipedal postural balance by restricting the ankle angular motions but induce complex adaptations of the postural control system which combine factors of a mechanical, motor, and sensorial nature. They impede postural control mainly when standing on stable ground without producing similar deleterious effects on unstable surfaces. Application: Our results show that HS boots as ski boots can improve lateral balance on unstable surfaces, which can contribute to prevent fall risk and ankle sprain.

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Section: Unstable Postural Tasksmentioning

confidence: 99%

Ski Boots Do Not Impair Standing Balance by Restricting Ankle-Joint Mobility

et al. 2018

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“…However, the energy cost during gait is improved by wearing an orthosis [ 2 ]. Furthermore, orthosis may change the sensory input and cause a change in the H-reflex and Hoffmann reflex; however, the results of these reports are inconsistent [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, the energy cost during gait is improved by wearing an orthosis [2]. Furthermore, orthosis may change the sensory input and cause a change in the H-reflex and Hoffmann reflex; however, the results of these reports are inconsistent [3,4]. Specifically, previous studies in healthy adults have reported the effect of an orthosis on biomechanics during gait.…”

Section: Introductionmentioning

confidence: 99%

Effects of orthoses on muscle activity and synergy during gait

Hashiguchi

Goto

Naka³

2023

PLoS ONE

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An orthosis is often used in rehabilitation to improve kinetic and kinematic parameters during gait. However, whether changes in neural control depend on wearing an orthosis during gait is unclear. We measured the muscle activity and synergy of the lower limb muscles without orthosis and with two types of orthoses: ankle–foot orthosis (AFO) and knee–ankle–foot orthosis (KAFO). Muscle activity during gait was measured in 15 healthy adults, and muscle synergies were extracted using non-negative matrix factorization. The results revealed that some muscle activities were significantly different among the three conditions. Post-hoc analysis indicated differences between each condition. Knee extensor muscle activity related to the loading response was significantly increased by wearing the AFO. In the KAFO condition, hip abductor muscle activity related to weight bearing was significantly decreased, and ankle dorsiflexor muscle activity was increased to secure clearance during the swing phase. However, the number of muscle synergies and complexity of muscle synergy did not significantly change among these conditions. However, along with changes in muscle activity, the activation pattern and weightings of muscle synergies tended to change with the use of orthoses. Each muscle activity was changed by wearing the orthosis; however, the immediate mechanical constraint did not change the framework of muscle synergy.

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