Wednesday, May 22, 2024

New method helps measure particular person limb contributions to standing postural management


Can these contributions to standing postural management be quantified from CoP trajectories in neurotypical adults?


Instantaneous contributions could be adverse or bigger than one, and built-in contributions sum to equal one. Proof-of-concept demonstrations validated these calculated contributions by limiting CoP movement beneath one or each ft. We evaluated these contributions in 30 neurotypical younger adults who accomplished two (eyes opened; eyes closed) 30-s trials of bipedal standing. We evaluated the relationships between limb contributions, self-reported limb dominance, and between-limb weight distributions.


All members self-reported as right-limb dominant; nonetheless, a spread of imply limb contributions had been noticed with eyes opened (Left: imply [range] = 0.52 [0.37–0.63]; Proper: 0.48 [0.31–0.63]) and with eyes closed (Left: 0.51 [0.39–0.63]; Proper: 0.49 [0.37–0.61]). Weight-shift contributions had been small with eyes opened (0.00 [−0.01 to 0.01]) and eyes closed (0.00 [−0.01 to 0.02]). We didn’t establish any between-limb variations in contributions when grouped by self-reported limb dominance (p > 0.10, d < 0.31). Contributions didn’t considerably correlate with Waterloo Footedness scores (−0.22 < r < 0.21, p > 0.25) or between-limb weight distributions (0 < r < 0.24, p > 0.20).


Throughout neurotypical members, we noticed a notable vary of limb contributions not associated to self-reported limb dominance or between-limb weight distributions. With this software, we will characterize variations within the quantity of CoP movement and the underlying management methods. Adjustments in limb contribution could be measured longitudinally (i.e., throughout rehabilitation packages, illness development, growing older) consultant of limb operate, which can be notably helpful in populations with uneven operate.


Postural sway is usually quantified from center-of-pressure (CoP) trajectories throughout quiet standing. Anteroposteriorly, destabilizing gravitational forces are countered with ankle plantar- and dorsiflexor moments-;the first postural management mechanisms throughout quiet stance-;leading to CoP motion beneath every foot [1], [2], [3], [4], [5].

Understanding how particular person limbs contribute to this standing postural management as measured utilizing the CoP is of explicit curiosity when evaluating populations with uneven operate (e.g., stroke, amputations) the place internet CoP measures could overlook variations. For instance, individuals with Parkinson’s illness, who exhibit uneven limb operate and standing stability [6], could not present important variations in standing postural management early in illness development when characterised by conventional internet middle of strain evaluation, however do in later phases [7].

Earlier efforts evaluating the CoP between limbs confirmed each similarities and variations within the spatial and frequency domains, correlations to internet CoP, and between-limb synchrony [2], [3], [5], [8], [9], [10]. Nevertheless, these approaches didn’t quantify how every limb, and weight shifting, contributed to anteroposterior CoP management. Due to this fact, these earlier strategies ignored related biomechanical CoP management methods.

The aim of this evaluation was to (1) validate a novel measure of standing anteroposterior CoP management and (2) assess the connection between this measure and customary limb dominance characterizations. We hypothesized that (1) our novel measure could be legitimate evidenced by proof-of-concept trials focusing on every variable, and (2) limb contributions could be distinct from limb dominance.

Proof-of-concept outcomes

The unrestricted situation confirmed uneven and constant contributions from every limb, with small weight-shift contributions (Fig. 2A). With one limb restricted, the unrestricted limb was the first contributor (Fig. 2B and C). With each limbs restricted, weight shifting was the first contributor (Fig. 2D).

Exploratory outcomes

Eyes-opened outcomes are proven in Fig. 3. Eyes-closed outcomes and a correlation matrix are supplied within the Supplementary materials. Throughout neurotypical members, we noticed a notable


These outcomes validate our novel calculation of limb contributions to standing anteroposterior postural management. Our conclusions and variable contributions had been constant between eyes-opened and eyes-closed situations. Nevertheless, these contributions didn’t look like associated to self-reported limb dominance (i.e., kicking limb and Waterloo Footedness) or between-limb weight distributions. Self-reported limb dominance has additionally poorly recognized the popular touchdown limb for younger adults.


Journal reference:

Tracy, J. B., et al. (2023) A novel technique to quantify particular person limb contributions to standing postural management. Gait & Posture.


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