Relationship Between Forward Trunk Lean During Walking and Musculoskeletal Functions for Females

Sato, Haruhiko; Maitland, Murray E.

doi:10.1142/s0219519408002796

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…We used a novel approach regarding the height at which the visual targets were presented, as opposed to eye level. Elders have been shown to adopt forward trunk lean, which may be related to factors such as backward disequilibrium (Manckoundia et al, 2007 ) or poor balance and fear of falling (Sato and Maitland, 2008 ). Previous research has also shown focusing gaze at different heights affects measures of postural sway, e.g., 25° up or down from eye level decreased sway velocity and amplitude (Ustinova and Perkins, 2011 ).…”

Section: Methodsmentioning

confidence: 99%

Eye Movements Affect Postural Control in Young and Older Females

Thomas

Bampouras

Donovan

et al. 2016

Front. Aging Neurosci.

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Visual information is used for postural stabilization in humans. However, little is known about how eye movements prevalent in everyday life interact with the postural control system in older individuals. Therefore, the present study assessed the effects of stationary gaze fixations, smooth pursuits, and saccadic eye movements, with combinations of absent, fixed and oscillating large-field visual backgrounds to generate different forms of retinal flow, on postural control in healthy young and older females. Participants were presented with computer generated visual stimuli, whilst postural sway and gaze fixations were simultaneously assessed with a force platform and eye tracking equipment, respectively. The results showed that fixed backgrounds and stationary gaze fixations attenuated postural sway. In contrast, oscillating backgrounds and smooth pursuits increased postural sway. There were no differences regarding saccades. There were also no differences in postural sway or gaze errors between age groups in any visual condition. The stabilizing effect of the fixed visual stimuli show how retinal flow and extraocular factors guide postural adjustments. The destabilizing effect of oscillating visual backgrounds and smooth pursuits may be related to more challenging conditions for determining body shifts from retinal flow, and more complex extraocular signals, respectively. Because the older participants matched the young group's performance in all conditions, decreases of posture and gaze control during stance may not be a direct consequence of healthy aging. Further research examining extraocular and retinal mechanisms of balance control and the effects of eye movements, during locomotion, is needed to better inform fall prevention interventions.

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Section: Methodsmentioning

confidence: 99%

Eye Movements Affect Postural Control in Young and Older Females

Thomas

Bampouras

Donovan

et al. 2016

Front. Aging Neurosci.

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“…In addition, wearing highheel shoes also made the trunk to lean more, which may increase joint moment of lower limb during walking. 17 Therefore, it is important to investigate the cushioning and protection function of the forefoot and develop technologies to reduce the forefoot loading in high-heeled gait.…”

Section: Introductionmentioning

confidence: 99%

Biomechanical Effects of Foam Inserts on Forefoot Load During the High-Heeled Gait: A Pilot Study

Ren

et al. 2010

J. Mech. Med. Biol.

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This pilot study analyzed the loading on the medial forefoot (MF) region during walking in high-heel shoes. Eight healthy female volunteers have participated in this study with the heel height varied from 0 cm (flat), 4.5 cm (low), and 8.5 cm (high). The results showed that the load on MF increased with the heel height and the magnitude of the load could be effectively reduced by using foam inserts. Comparative studies of foams with different hardness and thicknesses showed that thicker soft foams had a significant advantage over thiner hard foams (P < 0.05) in reducing the peak pressures. An optimum condition with a thick soft insert could reduce MF pressure by 26%, impact force by 27%, and force time integral by 20% when compared to the condition without insert.

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“…This atypical knee moment counteracted the external moment caused by the ground reaction force vector passing in front of rather than behind the knee, which in turn was caused by significant forward trunk lean following surgery (Figure 4). Though knee hyperextension and greater anterior trunk lean have been observed in individuals with quadriceps muscle weakness (Siegel et al, 2007;Sato and Maitland, 2008), the participant's vastii muscles were not touched by the surgery, while his rectus femoris muscle was detached at its origin but later re-attached. Thus, while quadriceps muscle weakness seems unlikely, the participant's post-surgery EMG data suggests that quadriceps muscle activation impairment may have occurred (Supplementary Figure S3A) for reasons that remain unclear.…”

Section: Discussionmentioning

confidence: 99%

Changes in walking function and neural control following pelvic cancer surgery with reconstruction

Li,

Ao,

Vega

et al. 2024

Front. Bioeng. Biotechnol.

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Introduction: Surgical planning and custom prosthesis design for pelvic cancer patients are challenging due to the unique clinical characteristics of each patient and the significant amount of pelvic bone and hip musculature often removed. Limb-sparing internal hemipelvectomy surgery with custom prosthesis reconstruction has become a viable option for this patient population. However, little is known about how post-surgery walking function and neural control change from pre-surgery conditions.Methods: This case study combined comprehensive walking data (video motion capture, ground reaction, and electromyography) with personalized neuromusculoskeletal computer models to provide a thorough assessment of pre- to post-surgery changes in walking function (ground reactions, joint motions, and joint moments) and neural control (muscle synergies) for a single pelvic sarcoma patient who received internal hemipelvectomy surgery with custom prosthesis reconstruction. Pre- and post-surgery walking function and neural control were quantified using pre- and post-surgery neuromusculoskeletal models, respectively, whose pelvic anatomy, joint functional axes, muscle-tendon properties, and muscle synergy controls were personalized using the participant’s pre-and post-surgery walking and imaging data. For the post-surgery model, virtual surgery was performed to emulate the implemented surgical decisions, including removal of hip muscles and implantation of a custom prosthesis with total hip replacement.Results: The participant’s post-surgery walking function was marked by a slower self-selected walking speed coupled with several compensatory mechanisms necessitated by lost or impaired hip muscle function, while the participant’s post-surgery neural control demonstrated a dramatic change in coordination strategy (as evidenced by modified time-invariant synergy vectors) with little change in recruitment timing (as evidenced by conserved time-varying synergy activations). Furthermore, the participant’s post-surgery muscle activations were fitted accurately using his pre-surgery synergy activations but fitted poorly using his pre-surgery synergy vectors.Discussion: These results provide valuable information about which aspects of post-surgery walking function could potentially be improved through modifications to surgical decisions, custom prosthesis design, or rehabilitation protocol, as well as how computational simulations could be formulated to predict post-surgery walking function reliably given a patient’s pre-surgery walking data and the planned surgical decisions and custom prosthesis design.

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Relationship Between Forward Trunk Lean During Walking and Musculoskeletal Functions for Females

Cited by 5 publications

References 24 publications

Eye Movements Affect Postural Control in Young and Older Females

Eye Movements Affect Postural Control in Young and Older Females

Biomechanical Effects of Foam Inserts on Forefoot Load During the High-Heeled Gait: A Pilot Study

Changes in walking function and neural control following pelvic cancer surgery with reconstruction

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