Muscular activity of lower limb muscles associated with working on inclined surfaces

Lu, Ming‐Lun; Kincl, Laurel; Lowe, Brian D.; Succop, Paul; Bhattacharya, Amit

doi:10.1080/00140139.2014.968634

Cited by 8 publications

(4 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Consistent with this finding, the results of the current study further pointed out that standing on a sloped surface could result in increased randomness but decreased complexity in the directional coupling of COP compared with the horizontal surface. The changes in bidirectional coupling of COP could be associated with increased postural instability 37,38 and direction-specific sway 38 , and would be resultant from the alteration of reference frame regarding gravity, support surface and posture orientation 16,17 , or the different muscle activations and synergies contributing to ankle stiffness 18,39 .…”

Section: Discussionmentioning

confidence: 99%

Dynamical Analysis of Standing Balance Control on Sloped Surfaces in Individuals with Lumbar Disc Herniation

Zhang

Song

et al. 2020

Sci Rep

View full text Add to dashboard Cite

the changes of balance control mechanism caused by lumbar disc herniation (LDH) has not been well understood. This study aimed to investigate the effects of LDH on the balance control during standing on sloped surfaces. Ten patients with LDH and 10 gender-and age-matched healthy subjects were instructed to stand quietly on a sloped surface at −5°, 0° or +5°, respectively. The trajectories of the center of pressure (COP) of each individual limb and the full-body were recorded. Cross recurrence quantification analysis (CRQA) was applied to assess the coordination of COP components at the anterior-posterior and medial-lateral directions. The patients with LDH presented magnified inter-limb load asymmetry and had more deterministic components in the COP coordination of the less-affected limb and the full-body than the healthy subjects. The LDH led to decreased dynamical degree of freedom and less flexibility in bidirectional controlling the center of mass simultaneously. The effects of sensorimotor deficits due to LDH could be more obviously exhibited as standing on a declined rather than an inclined surface. This study shed light on the effects of LDH on standing balance control and may facilitate to develop novel strategies for evaluation of LDH.Experimental set-up. A force platform (FDM-S, Zebris Medical GmbH, Isny, Germany) covered with 64*40 pressure sensors was used to measure the foot plantar pressure distributions at a sampling frequency of 60 Hz. The COP time series were processed in the MATLAB R2017b (The Mathworks, Natick, MA, USA). Parameters of CRQA were implemented with the cross recurrence plot toolbox 5.16 23 . test procedures. The schematic diagram of the experiment set-up is depicted in Fig. 1. Subjects were required to stand barefoot quietly on the center of the force platform for 30 s, with their feet side by side, their hands naturally on both sides of body and their eyes gaged forward. Three angles of the force platform surface, including −5°, 0° and +5° with respect to the horizontal plane, were tested with a random sequence. For each surface angle, only one trial was performed by each subject. A 5-min rest was given between trials. In order to Scientific RepoRtS | (2020) 10:1676 | https://doi.org/10.1038/s41598-020-58455-z www.nature.com/scientificreports www.nature.com/scientificreports/ sloped surface could result in increased randomness but decreased flexibility in the bidirectional coupling of COP, suggesting an weakened feedback mechanism but a reinforced feedforward mechanism underlying the balance control. This study shed light on the effects of LDH on standing balance control and may facilitate to develop novel strategies for evaluation of LDH.

show abstract

Section: Discussionmentioning

confidence: 99%

Dynamical Analysis of Standing Balance Control on Sloped Surfaces in Individuals with Lumbar Disc Herniation

Zhang

Song

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Reference [44] also studied visual effect, muscular fatigue, task performance and working experience on inclined surfaces on activity of lower limb postural muscles rectus femoris, biceps femoris, tibialii anterior and gastrocnemii medial muscle groups associated with maintaining balance by normalised electro myo graphic (NEMG) data.…”

Section: Muscle Activity During Gaitmentioning

confidence: 99%

Human Gait with Reference to Age, Gender and Impact of Load: A Review

Thakurta¹,

Iqbal²,

Bhasin³

et al. 2016

AAP

View full text Add to dashboard Cite

This review paper summarizes the available literature regarding the analysis of human gait of with reference to age and its effect on the performance. The ability to walk upright on two legs (bipedalism) is the root of what it means to be human and each person displays personal peculiarities in their walking pattern. According to the studies, muscle activity changes with the deviation of gait pattern in different condition and even for different individuals. It has been found that a vivid knowledge about the kinetics and kinematics of human gait improves the understanding of proper mechanisms of walking and has found to be helpful. Studies also suggest that the determinants of gait from decades are never closely being observed which is needed and can be productive. Gait is altered by different factors especially age, gender, working conditions etc. Walking pattern or more precisely the parameters of gait are affected by different load carriage conditions. Aging has a great impact on gait variability. With increase in age gait parameters like step length becomes smaller and step width also becomes wider, even pelvic mobility also decreases which in turn slower the walking speed. A significant difference of gait initiation speed, hip and knee angles has been found between males and females. A few studies have shown a wide range of differences of human walking pattern between different populations. It varies from country to country, even region to region in a particular country due to differences found in the body composition which is again affected by various important factors like climate, food habit, landscapes etc.

show abstract

“…Some studies using surface electromyogram (EMG) examination have shown an increased activity of the soleus and the gastrocnemius while the feet are in plantar flexion [ 8 , 13 , 15 ]. A higher activity of the tibialis anterior associated with a dorsiflexion of the feet has also been described [ 8 , 16 ], but not systematically [ 13 , 15 ]. It should also be noted that most of these studies used high-sloping angles greater than or equal to 14°, which are often encountered in roofing [ 9 , 11 – 14 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…A higher activity of the tibialis anterior associated with a dorsiflexion of the feet has also been described [ 8 , 16 ], but not systematically [ 13 , 15 ]. It should also be noted that most of these studies used high-sloping angles greater than or equal to 14°, which are often encountered in roofing [ 9 , 11 – 14 , 16 ]. A few studies use 10° as the minimum value [ 8 , 15 ], yet this angle is greater than the usual walkway slope, whose standard is at 4.76° [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of forward and backward sloped support surfaces on postural equilibrium and ankle muscles activity

Atsawakaewmongkhon,

Couillandre,

Hamaoui

2024

PLoS ONE

View full text Add to dashboard Cite

Introduction Although sloped surfaces are common in daily living, most studies of body balance are carried out on flat surfaces, and few data are available for sloping angles below 14°. Objectives The purpose of this study was to explore the effect of forward and backward sloping surfaces at 7° and 15° on postural equilibrium and the activity of flexor/extensor ankle muscles. Methods Fifteen healthy subjects (8 males and 7 females) (27.67 ± 3.9 years) underwent a posturographic examination associated with a surface electromyogram (EMG) of tibialis anterior (TA), soleus (Sol) and gastrocnemius medialis (GasM) under five conditions of support inclination: 0° (H0), backward inclination at 7° and 15° (DF7 and DF15), forward inclination at 7° and 15° (PF7 and PF15). Results Results showed that the center of pressure (CP) was shifted according to the surface slope, with a forward move in PF7 (p <0.001) and PF15 (p <0.001) and a backward move in DF7 (p <0.01) and in DF15 (p <0.001). The mean displacement of the CP along the anterior-posterior axis (Xm) was increased in DF15 (p <0.01) relative to the H0 condition but reduced in PF7 (p <0.01). The normalized EMG revealed higher values when the muscles were in a shortened position (PF7 for Sol, p <0.05; PF15 for GasM, p <0.01; DF15 for TA, p<0.01) and lower values of GasM and Sol when lengthened (DF15, p <0.05). Conclusion Our findings indicate that standing on a backward sloped surface impairs body balance, while low-angle forward sloped surfaces might improve postural stability. Muscular activity variations of the ankle flexors/extensors, which are stretched or shortened, also seem to be related to the length-tension relationship of skeletal muscles.

show abstract

Muscular activity of lower limb muscles associated with working on inclined surfaces

Cited by 8 publications

References 49 publications

Dynamical Analysis of Standing Balance Control on Sloped Surfaces in Individuals with Lumbar Disc Herniation

Dynamical Analysis of Standing Balance Control on Sloped Surfaces in Individuals with Lumbar Disc Herniation

Human Gait with Reference to Age, Gender and Impact of Load: A Review

Effect of forward and backward sloped support surfaces on postural equilibrium and ankle muscles activity

Contact Info

Product

Resources

About