What are the effects of simulated muscle weakness on the sit-to-stand transfer?

Caruthers, Elena J; Schneider, Grant; Schmitt, Laura C.; Chaudhari, Ajit M.W.; Siston, Robert A.

doi:10.1080/10255842.2020.1764544

Cited by 7 publications

(11 citation statements)

References 33 publications

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“…For example, the optimal control pattern for the STS movement in a model with 40% weakened knee extensors used decreased knee flexion throughout the movement than a full-strength model [ 16 ]. These findings were confirmed in a recent simulation study that investigated what degree of simulated muscle weakness could be tolerated while maintaining the subject’s experimentally observed joint mechanics during the STS transfer [ 17 ]. Simulations of individuals who used greater knee flexion through the forward leaning and momentum transfer phases of the STS, due to an initial position in which their hips were below their knees, were less tolerant to quadriceps weakness than individuals who used decreased knee flexion to complete the task [ 17 ].…”

Section: Introductionsupporting

confidence: 66%

“…These findings were confirmed in a recent simulation study that investigated what degree of simulated muscle weakness could be tolerated while maintaining the subject’s experimentally observed joint mechanics during the STS transfer [ 17 ]. Simulations of individuals who used greater knee flexion through the forward leaning and momentum transfer phases of the STS, due to an initial position in which their hips were below their knees, were less tolerant to quadriceps weakness than individuals who used decreased knee flexion to complete the task [ 17 ]. Thus, there is a relationship between muscle strength and the range of kinematics that enable an individual to use that strength to accomplish a movement task.…”

Section: Introductionsupporting

confidence: 66%

“…It is worth noting that increasing pelvis height would also increase the negative support potential of tibialis anterior. However, previous research has shown that tibialis anterior provides stabilization during the STS transfer [ 9 , 30 ], it is not a primary contributor to support during the STS transfer [ 6 , 17 ], therefore its potential will not have a significant effect on contributions to support due to minimal tibialis anterior force production.…”

Section: Discussionmentioning

confidence: 99%

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Discover your potential: The influence of kinematics on a muscle’s ability to contribute to the sit-to-stand transfer

et al. 2022

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Existing methods for estimating how individual muscles contribute to a movement require extensive time and experimental resources. In this study we developed an efficient method for determining how changes to lower extremity joint kinematics affect the potential of individual muscles to contribute to whole-body center-of-mass vertical (support) and anteroposterior (progression) accelerations. A 4-link 2-dimensional model was used to assess the effect of kinematic changes on muscle function. Joint kinematics were systematically varied throughout ranges observed during the momentum transfer phase of the sit-to-stand transfer. Each muscle’s potential to contribute to support and progression was computed and compared to simulated potentials estimated by traditional dynamic simulation methods for young adults and individuals with knee osteoarthritis. The new method required 4-10s to compute muscle potentials per kinematic state and computed potentials were consistent with simulated potentials. The new method identified differences in muscle potentials between groups due to kinematic differences, particularly decreased anterior pelvic tilt in young adults, and revealed kinematic and muscle strengthening modifications to increase support. The methods presented provide an efficient, systematic approach to evaluate how joint kinematic adjustments alter a muscle’s ability to contribute to movement and can identify potential sources of pathologic movement and rehabilitation strategies.

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Section: Introductionsupporting

confidence: 66%

Section: Introductionsupporting

confidence: 66%

Section: Discussionmentioning

confidence: 99%

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Discover your potential: The influence of kinematics on a muscle’s ability to contribute to the sit-to-stand transfer

et al. 2022

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“…It is worth noting that increasing pelvis height would also increase the negative support potential of tibialis anterior. However, previous research has shown that tibialis anterior is not a primary contributor to the STS transfer [6,13], therefore its potential will not have a significant effect on contributions to support due to minimal tibialis anterior force production.…”

Section: Discussionmentioning

confidence: 99%

“…These changes in joint kinematics will alter the force and torque generation capacity of the muscles that cross the joint by altering the muscle’s fiber length and moment arm, respectively. Indeed, a recent simulation study investigated what degree of simulated muscle weakness could be tolerated while maintaining the subject’s experimentally observed joint mechanics during the STS transfer and found that simulations of individuals who performed the STS transfer with greater knee flexion were less tolerant to quadriceps weakness than individuals who used decreased knee flexion to complete the task [13]. Thus, there is a relationship between muscle strength and the range of kinematics that enable an individual to use that strength to accomplish a movement task.…”

Section: Introductionmentioning

confidence: 99%

Discover Your Potential: The Influence of Kinematics on a Muscle’s Ability to Contribute to the Sit-to-Stand Transfer

et al. 2021

Preprint

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Existing methods for estimating how individual muscles contribute to a movement require extensive time and experimental resources. In this study we developed an efficient method for determining how changes to lower extremity joint kinematics affect the potential of individual muscles to contribute to whole-body center-of-mass vertical (support) and anteroposterior (progression) accelerations. A 4-link 2-dimensional model was used to assess the effect of kinematic changes on muscle function. Joint kinematics were systematically varied throughout ranges observed during the momentum transfer phase of the sit-to-stand transfer. Each muscle's potential to contribute to support and progression was computed and compared to simulated potentials estimated by traditional dynamic simulation methods for young adults and individuals with knee osteoarthritis (KOA). The new method required 4-10s to compute muscle potentials per kinematic state and computed potentials were consistent with simulated potentials. The new method identified differences in muscle potentials between groups due to kinematic differences, particularly decreased anterior pelvic tilt in young adults, and revealed kinematic and muscle strengthening modifications to increase support. The methods presented provide an efficient, systematic approach to evaluate how joint kinematic adjustments alter a muscle's ability to contribute to movement and can identify potential sources of pathologic movement and rehabilitation strategies.

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Can nonlinear analysis of movement patterns reveal the status of the musculoskeletal system?

Fonseca,

Souza,

Aquino

et al. 2024

Progress in Motor Control

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What are the effects of simulated muscle weakness on the sit-to-stand transfer?

Cited by 7 publications

References 33 publications

Discover your potential: The influence of kinematics on a muscle’s ability to contribute to the sit-to-stand transfer

Discover your potential: The influence of kinematics on a muscle’s ability to contribute to the sit-to-stand transfer

Discover Your Potential: The Influence of Kinematics on a Muscle’s Ability to Contribute to the Sit-to-Stand Transfer

Can nonlinear analysis of movement patterns reveal the status of the musculoskeletal system?

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