Differences in lower extremity muscular coactivation during postural control between healthy and obese adults

Maktouf, Waël; Boyas, Sébastien; Beaune, Bruno; Durand, Sylvain

doi:10.1016/j.gaitpost.2020.07.068

Cited by 14 publications

(13 citation statements)

References 32 publications

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“…. It is worth mentioning that this strategy leads to increasing energy costs, stress and stiffness, and it is associated with impaired postural control [25,26]. That phenomenon appears also in Parkinson's disease [27].…”

Section: Introductionmentioning

confidence: 99%

Effect of voluntary muscle contraction on postural stability in healthy adults

Kędziorek¹,

Błażkiewicz²

2021

areh

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Introduction: Postural control is a complex system that combines many subcomponents. The central nervous system's connection with the muscular system allows to execute the voluntary movements and provides appropriate tonus and contractions of postural muscles. The aim of this study was to assess the effect of voluntary muscle contraction on the stability of standing posture. Material and methods: Seventeen young adults (24.11 ± 3.05 years) completed 4 bipedal standing attempts lasting 20 seconds each. Measurements were performed on AMTI plate and involved maintaining balance while standing barefoot on both feet with eyes open and closed. Two additional tests with provoked isometric voluntary muscle contraction were performed under the same visual conditions. Results: For examined healthy subjects, the lack of visual feedback in combination with increased muscle tension caused a significant increase in the peak of sway in the anteriorposterior (AP) and medio -lateral (ML) direction. On the other hand, the values of the center of pressure (CoP) path length and its velocity due to the increased muscle contraction did not significantly decrease their values for trials with eyes open and closed. Conclusions: This study indicates that voluntary muscle contraction can influence the standing posture mainly in combination with a lack of visual feedback, causing its deterioration.

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Section: Introductionmentioning

confidence: 99%

Effect of voluntary muscle contraction on postural stability in healthy adults

Kędziorek¹,

Błażkiewicz²

2021

areh

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“…The root-meansquare (RMS) of the filtered EMG data was calculated as a percentage of the EMG value during the MVC. The normalized RMS of the TA and MGA muscles were then used for calculating the averaged co-contraction level of these muscles based on the following formula, which was described previously [51,52]: Co-contraction index (CCI) = 2I antagonist I total × 100.…”

Section: Discussionmentioning

confidence: 99%

“…decreased proprioceptive information while standing on the foam surface), postural control becomes more difficult and needs more attentional resources [7,49], leading to the enhanced use of the cautious mode of postural control and stiffening strategy. Previous studies also showed greater co-contraction of the ankle muscles during standing on the unstable support surface in healthy adults [52]. It has been suggested that ankle stiffening strategy may occur in an attempt to closely and consciously regulate the postural control because of postural threat (e.g.…”

Section: Plos Onementioning

confidence: 94%

Overload of anxiety on postural control impairments in chronic stroke survivors: The role of external focus and cognitive task on the automaticity of postural control

et al. 2021

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Background Despite the high prevalence of anxiety among chronic stroke survivors and evidence of its negative effects on postural control in healthy subjects, it is unclear whether anxiety also affects postural control in these patients. Recent evidence of improved postural control of healthy subjects by distracting the attention using an external focus (EF) or cognitive task, raises the question of whether similar benefits would be observed in stroke survivors. Thus, the current study aimed to investigate the effects of anxiety and distracting the attention on postural control of chronic stroke survivors in terms of both postural sway measures and neuromuscular regulation. Methods Postural sway measures and ankle muscle activity of chronic stroke survivors with the high and low level of anxiety (HA-stroke (n = 17), and LA-stroke (n = 17), respectively) and age-, sex-, height-, and weight-matched healthy subjects (n = 17) were assessed while standing on rigid and foam surfaces under following conditions: baseline, internal focus (IF), EF, simple and hard cognitive tasks (SC and HC, respectively). Results Stroke survivors, particularly HA-stroke participants, showed greater postural sway measures (i.e. postural instability) and enhanced co-contraction of ankle muscles (i.e. stiffening of the neuromuscular system) compared with healthy subjects. As opposed to baseline and IF conditions, postural instability and neuromuscular stiffening significantly reduced in EF condition and decreased more in cognitive task conditions, particularly HC condition. Conclusions The results suggest that anxiety enhances stroke-induced postural instability promoting improper neuromuscular control of posture with stiffening strategy, which can be alleviated by EF and cognitive tasks.

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“…Meng's findings indicated that higher BMI was associated with both cognitive function and postural control declines (18). Maktouf evaluated static postural control by CoP displacements during quiet standing, resulting with higher CoP displacements in obese individuals than in controls (34). Electromyography activity data demonstrated that obesity increased the soleus and tibialis anterior muscle coactivation at the ankle joint during static control (34).…”

Section: Discussionmentioning

confidence: 99%

“…Maktouf evaluated static postural control by CoP displacements during quiet standing, resulting with higher CoP displacements in obese individuals than in controls (34). Electromyography activity data demonstrated that obesity increased the soleus and tibialis anterior muscle coactivation at the ankle joint during static control (34). It was an adaptive neuromuscular response for improving stability by a joint stiffening strategy, which could not be considered as appropriate adaptation (34).…”

Section: Discussionmentioning

confidence: 99%

Impact of Body Mass Index on Static Postural Control in Adults With and Without Diabetes: A Cross-Sectional Study

et al. 2021

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AimThe objective of this research was to determine the static postural control differences measured from a force platform in Type 2 diabetes mellitus (T2DM) and healthy control groups with different levels of body mass index (BMI), and detect the static postural control difference between T2DM and healthy control groups stratified by different BMI category. This research also explored the relationship of BMI and static postural performance.MethodsWe recruited 706 participants with T2DM and 692 healthy controls who were sufficiently matched for age, gender, and BMI in this cross-sectional study. The participants were stratified into three groups by BMI: normal weight, overweight, and obesity. All participants performed two-legged static stance postural control assessment on a firm force platform. The Center of Pressure (CoP) parameters were collected under eyes-open and eyes-closed conditions. Mann–Whitney U test was used to compare the static postural control parameters within each BMI category in both groups. The static postural control parameters among different weight groups were compared by Kruskal–Wallis test, post hoc pair-wise comparison were conducted. Generalized linear model was conducted to examine the association between BMI and static postural control parameters while controlling for confounding factors.ResultsHealthy control group had statistical difference in most CoP parameters compared to T2DM group based on all BMI categories. Normal weight participants presented significant difference compared with overweight and/or obesity for total track length (TTL) and velocity of CoP displacements in Y direction (V-Y) under eyes-open condition, and for most CoP parameters under eyes-closed condition in both groups. There were statistically significant correlations between BMI and most static postural control parameters under only eyes-closed condition according to the result of generalized linear model.ConclusionT2DM patients had impaired static postural control performance compared to healthy controls at all BMI categories. The findings also indicated the association between BMI and static postural control, where higher BMI individuals showed more static postural instability in both T2DM and healthy controls.

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Differences in lower extremity muscular coactivation during postural control between healthy and obese adults

Cited by 14 publications

References 32 publications

Effect of voluntary muscle contraction on postural stability in healthy adults

Effect of voluntary muscle contraction on postural stability in healthy adults

Overload of anxiety on postural control impairments in chronic stroke survivors: The role of external focus and cognitive task on the automaticity of postural control

Impact of Body Mass Index on Static Postural Control in Adults With and Without Diabetes: A Cross-Sectional Study

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