Muscle Activation Patterns Coordinating Postural Stability from Head to Foot

Keshner, Emily A.; Allum, J.H.J.

doi:10.1007/978-1-4613-9030-5_29

Cited by 11 publications

(6 citation statements)

References 23 publications

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“…The discerned subjective preference upon landing in FT mode, particularly the discernible reduction in moment arms along the longitudinal and anteroposterior axes, may be intricately linked to individuals’ perceptual acuity and adaptive prowess in the realm of posture control. The extant literature posits that as the support base diminishes, a paradigmatic shift occurs in the dominant mode of posture control, transitioning from the ankle joint towards more proximal anatomical structures, notably adopting knee or hip-centric strategies ( Keshner and Allum, 1990 ). Within the purview of our investigation, we observed a lack of statistically significant alterations in knee joint angles during FT mode.…”

Section: Discussionmentioning

confidence: 99%

Exploring biomechanical variations in ankle joint injuries among Latin dancers with different stance patterns: utilizing OpenSim musculoskeletal models

Gao,

Xu,

Baker

et al. 2024

Front. Bioeng. Biotechnol.

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Background: Dancers represent the primary demographic affected by ankle joint injuries. In certain movements, some Latin dancers prefer landing on the Forefoot (FT), while others prefer landing on the Entire foot (ET). Different stance patterns can have varying impacts on dancers’ risk of ankle joint injuries. The purpose of this study is to investigate the differences in lower limb biomechanics between Forefoot (FT) dancers and Entire foot (ET) dancers.Method: A group of 21 FT dancers (mean age 23.50 (S.D. 1.12) years) was compared to a group of 21 ET dancers (mean age 23.33 (S.D. 0.94) years), performing the kicking movements of the Jive in response to the corresponding music. We import data collected from Vicon and force plates into OpenSim to establish musculoskeletal models for computing kinematics, dynamics, muscle forces, and muscle co-activation.Result: In the sagittal plane: ankle angle (0%–100%, p < 0.001), In the coronal plane: ankle angle (0%–9.83%, p = 0.001) (44.34%–79.52%, p = 0.003), (88.56%–100%, p = 0.037), ankle velocity (3.73%–11.65%, p = 0.017) (94.72–100%, p = 0.031); SPM analysis revealed that FT dancers exhibited significantly smaller muscle force than ET dancers around the ankle joint during the stance phase. Furthermore, FT dancers displayed reduced co-activation compared to ET dancers around the ankle joint during the descending phase, while demonstrating higher co-activation around the knee joint than ET dancers.Conclusion: This study biomechanically demonstrates that in various stance patterns within Latin dance, a reduction in lower limb stance area leads to weakened muscle strength and reduced co-activation around the ankle joint, and results in increased ankle inversion angles and velocities, thereby heightening the risk of ankle sprains. Nevertheless, the increased co-activation around the knee joint in FT dancers may be a compensatory response for reducing the lower limb stance area in order to maintain stability.

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Section: Discussionmentioning

confidence: 99%

Exploring biomechanical variations in ankle joint injuries among Latin dancers with different stance patterns: utilizing OpenSim musculoskeletal models

Gao,

Xu,

Baker

et al. 2024

Front. Bioeng. Biotechnol.

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“…This may provide some evidence for the central strategy of the body to keep the CG in a stable position and to minimize muscular activity while standing still. Such a strategy has been widely discussed in the literature (Andersson and Winters 1990;Keshner and Allum 1990;Penzer et al 1995;Valk-Fai 1973).…”

Section: Discussionmentioning

confidence: 99%

“…In previous studies the internal forces and torques in the joints were resolved on the basis of direct measurements of the kinematics of the body segments and of the foot-ground reactions (Fioretti et al 1992a,b;Penzer et al 1995;Vaughan et al 1982a,b). Whole-body kinematics was also measured in clinical practice in an attempt to understand the role of the motor feedback elements (i.e., visual, vestibular, and proprioceptive) in stabilizing the body (Andersson and Winters 1990;Barin 1989;Keshner and Allum 1990;Penzer et al 1995;Snijders and Verduin 1973;Valk-Fai 1973). Three-dimensional measurements of the kinematics of the body require at least two cameras and an array of markers.…”

Section: Introductionmentioning

confidence: 99%

Standing sway: iterative estimation of the kinematics and dynamics of the lower extremities from force-plate measurements

Levin

Mizrahi

Shoham

1998

Biological Cybernetics

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In this study, a model for the estimation of the dynamics of the lower extremities in standing sway from force plate data only is presented. A three-dimensional, five-segment, four-joint model of the human body was used to describe postural standing sway dynamics. Force-plate data of the reactive forces and centers of pressure were measured bilaterally. By applying the equations of motion to these data, the transversal trajectory of the center of gravity (CG) of the body was resolved in the sagittal and coronal planes. An inverse kinematics algorithm was used to evaluate the kinematics of the body segments. The dynamics of the segments was then resolved by using the Newton-Euler equations, and the model's estimated dynamic quantities of the distal segments were compared with those actually measured. Differences between model and measured dynamics were calculated and minimized, using an iterative algorithm to re-estimate joint positioning and anthropometric properties. The above method was tested with a group of 11 able-bodied subjects, and the results indicated that the relative errors obtained in the final iteration were of the same order of magnitude as those reported for closed loop problems involved in direct kinematic measurements of human gait.

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“…Backward translation of the platform caused compensating actions involving major rotations about the ankle, hip, and neck joints, whereas rotation of the support surface induced a completely different movement strategy, which was termed a "stiffening" multilink strategy (Allum, Honegger, & Pfaltz, 1989). In spite of an equal amount of dorsiflexion, the compensatory rotational velocities of body segments were an order of magnitude smaller than those occurring after backward translation of the platform (Keshner & Allum, 1990; see Figure 7, left side). This difference in stabilizing strategy is deemed to depend on the direction of trunk and head acceleration, whereas the appropriate response is deemed to be preprogrammed from the very first response.…”

Section: Implications For Studies On Dynamic Postural Controlmentioning

confidence: 96%

“…The drawback of this approach is that it may lead to conclusions about sensory signals and underlying control mechanisms that prove misguided when the mechanical context of multijoint movements is taken into account (Keshner & Allum, 1990). From this perspective, it would be interesting to reexamine the results of studies in which upright stance Control of Ground Reaction Force in Liing was mechanically perturbed to elicit postural control reactions.…”

Section: Implications For Studies On Dynamic Postural Controlmentioning

confidence: 98%

Controlling the Ground Reaction Force during Lifting

Toussaint¹,

Commissaris²,

Dieeumlant³

et al. 1995

Journal of Motor Behavior

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The control of the ground reaction force vector relative to the center of gravity (CoG) was examined while subjects performed a back-lifting task. Six male subjects (aged 24.0 +/- 2.5 years) repeatedly lifted a barbell. A biomechanical analysis that used a linked segment model revealed that the summed rotations of body segments during lifting yielded a specific rate of change of the angular momentum of the entire body. This equaled the external moment provided by Fsubg; relative to CoG. This implies that multisegment movements involve control of the angular momentum of the entire body through an appropriately directed Fsubg;. Thus, in dynamic tasks Fsubg; is pointed away from rather than lined up with the CoG, as is the case in static tasks.

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Muscle Activation Patterns Coordinating Postural Stability from Head to Foot

Cited by 11 publications

References 23 publications

Exploring biomechanical variations in ankle joint injuries among Latin dancers with different stance patterns: utilizing OpenSim musculoskeletal models

Exploring biomechanical variations in ankle joint injuries among Latin dancers with different stance patterns: utilizing OpenSim musculoskeletal models

Standing sway: iterative estimation of the kinematics and dynamics of the lower extremities from force-plate measurements

Controlling the Ground Reaction Force during Lifting

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