Postural responses to yaw rotation of support surface

Chen, Chiung Ling; Lou, Shu Zon; Wu, Hong; Wu, Shyi Kuen; Yeung, Kwok Tak; Su, Fong Chin

doi:10.1016/j.gaitpost.2012.07.007

Cited by 4 publications

(6 citation statements)

References 15 publications

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“…Externally induced postural perturbations are often applied in research to study feedback postural responses. The most common form of externally induced postural perturbation is support surface perturbation induced by a platform, which moves the base of support (BOS) under the body’s center of mass (COM) [1-7]. These support surface perturbations replicate the conditions of slipping, tripping, stepping on an irregular surface, or accelerating or decelerating the support surface during vehicular motion.…”

Section: Introductionmentioning

confidence: 99%

Effects of the type and direction of support surface perturbation on postural responses

Chen

Lou

et al. 2014

J NeuroEngineering Rehabil

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BackgroundPostural control is organized around a task goal. The two most frequently used types of tasks for postural control research are translational (translation along the anterior-posterior axis) and rotational (rotation in sagittal plane) surface perturbations. These types of perturbations rotate the ankle joint, causing different magnitudes and directions of body sway. The purpose of this study was to investigate the effects of the type (translation vs. rotation) and direction (forward/toe up vs. backward/toe down) of the perturbation on postural responses.MethodNineteen healthy subjects were tested with four perturbations, i.e., forward and backward translation and toe up and toe down rotation. The onset latency and magnitude of muscle activations, angular changes, and COM displacements were measured. In addition, the kinematic data were divided into two phases. The initial phase reflected the balance disturbance induced by the platform movement, and the reversal phase reflected the balance reaction.ResultsThe results showed that, in the initial phase, rotational perturbation induced earlier ankle movement and faster and larger vertical COM displacement, while translational and forward/toe up perturbations induced larger head and trunk angular change and faster and larger horizontal COM displacement. In the reversal phase, balance reaction was attained by multi-joint movements. Translational and forward/toe up perturbations that induced larger upper body instability evoked faster muscle activation as well as faster and larger hip or knee joint movements.ConclusionsThese findings provide insights into an appropriate support surface perturbation for the evaluation and training of balance.

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Section: Introductionmentioning

confidence: 99%

Effects of the type and direction of support surface perturbation on postural responses

Chen

Lou

et al. 2014

J NeuroEngineering Rehabil

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“…This resulted in higher muscle activity levels in more challenging perturbation conditions. In contrast, recent work of Chen et al [ 44 ] found no effect of a platform’s amplitude and velocity on the magnitude of muscle activation although it did significantly affect the joint movements and the COM displacements. Mixed conditions were also included in the present study.…”

Section: Discussionmentioning

confidence: 66%

“…It is important to mention that we only included the knee joint kinematics in the sagittal and frontal planes. However, evidence showed the human body acts as a linked-segment model [ 44 ]. So, it might be possible that the MPP induced differences in the kinematics of other segments of the human body, i.e.…”

Section: Discussionmentioning

confidence: 99%

Dynamic Neuromuscular Control of the Lower Limbs in Response to Unexpected Single-Planar versus Multi-Planar Support Perturbations in Young, Active Adults

et al. 2015

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PurposeAn anterior cruciate ligament (ACL) injury involves a multi-planar injury mechanism. Nevertheless, unexpected multi-planar perturbations have not been used to screen athletes in the context of ACL injury prevention yet could reveal those more at risk. The objective of this study was to compare neuromuscular responses to multi-planar (MPP) and single-planar perturbations (SPP) during a stepping-down task. These results might serve as a basis for future implementation of external perturbations in ACL injury screening programs.MethodsThirteen young adults performed a single leg stepping-down task in eight conditions (four MPP and four SPP with a specified amplitude and velocity). The amplitudes of vastus lateralis (VL), vastus medialis (VM), hamstrings lateralis (HL), hamstrings medialis (HM) EMG activity, medio-lateral and anterior-posterior centre of mass (COM) displacements, the peak knee flexion and abduction angles were compared between conditions using an one-way ANOVA. Number of stepping responses were monitored during all conditions.ResultsSignificantly greater muscle activity levels were found in response to the more challenging MPP and SPP compared to the less challenging conditions (p < 0.05). No differences in neuromuscular activity were found between the MPP conditions and their equivalents in the SPP. Eighteen stepping responses were monitored in the SPP versus nine in the MPP indicating that the overall neuromuscular control was even more challenged during the SPP which was supported by greater COM displacements in the SPP.ConclusionThe more intense MPP and SPP evoked different neuromuscular responses resulting in greater muscle activity levels compared to small perturbations. Based on the results of COM displacements and based on the amount of stepping responses, dynamic neuromuscular control of the knee joint appeared less challenged during the MPP. Therefore, future work should investigate extensively if other neuromuscular differences (i.e. co-activation patterns and kinetics) exist between MPP and SPP. In addition, future work should examine the influence on the neuromuscular control of the magnitude of the perturbations and the magnitude of stepping height and stepping distance.

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“…[111,119] Onset latency Time delay between onset of perturbation and muscle activation. It represents how fast a muscle reacts after a perturbation.…”

mentioning

confidence: 99%

“…It represents how fast a muscle reacts after a perturbation. Impaired balancing strategies report high values of onset latency [86,90,111,119]. Time to peak Time between the onset of perturbation and the maximum activation of the muscle or the maximum peak of joint angle.…”

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confidence: 99%

Fifteen Years of Wireless Sensors for Balance Assessment in Neurological Disorders

Zampogna

Mileti

Palermo

et al. 2020

Sensors

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Balance impairment is a major mechanism behind falling along with environmental hazards. Under physiological conditions, ageing leads to a progressive decline in balance control per se. Moreover, various neurological disorders further increase the risk of falls by deteriorating specific nervous system functions contributing to balance. Over the last 15 years, significant advancements in technology have provided wearable solutions for balance evaluation and the management of postural instability in patients with neurological disorders. This narrative review aims to address the topic of balance and wireless sensors in several neurological disorders, including Alzheimer’s disease, Parkinson’s disease, multiple sclerosis, stroke, and other neurodegenerative and acute clinical syndromes. The review discusses the physiological and pathophysiological bases of balance in neurological disorders as well as the traditional and innovative instruments currently available for balance assessment. The technical and clinical perspectives of wearable technologies, as well as current challenges in the field of teleneurology, are also examined.

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Postural responses to yaw rotation of support surface

Cited by 4 publications

References 15 publications

Effects of the type and direction of support surface perturbation on postural responses

Effects of the type and direction of support surface perturbation on postural responses

Dynamic Neuromuscular Control of the Lower Limbs in Response to Unexpected Single-Planar versus Multi-Planar Support Perturbations in Young, Active Adults

Fifteen Years of Wireless Sensors for Balance Assessment in Neurological Disorders

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