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Muscle Stimulation Frequency

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Related Experiment Video

Updated: May 25, 2026

Quantifying Arms and Legs Contributions during Repetitive Electrically-Assisted Sit-To-Stand Exercise in Paraplegics: A Pilot Study

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The minimum required muscle force for a sit-to-stand task.

Shinsuke Yoshioka¹, Akinori Nagano, Dean C Hay

¹Ritsumeikan University, Nojihigashi 1-1-1, Kusatsu city, Shiga 525-8577, Japan. yoshio-s@fc.ritsumei.ac.jp

Journal of Biomechanics

|January 13, 2012

Summary

This summary is machine-generated.

Researchers identified the minimum muscle force needed for sit-to-stand movements. The total force of hip and knee extensors serves as a reliable index, ranging from 35.3-49.2 N/kg.

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Area of Science:

Biomechanics
Human Movement Analysis
Musculoskeletal Physiology

Background:

The sit-to-stand (STS) task is fundamental for daily living and mobility.
Understanding the biomechanical demands of STS is crucial for rehabilitation and performance enhancement.
Quantifying the minimum muscle force required for STS provides insights into functional limitations and training needs.

Purpose of the Study:

To determine the minimum muscle force necessary to successfully execute a sit-to-stand movement.
To establish a reliable index for quantifying this minimum required muscle force.

Main Methods:

Combined experimental motion capture with computational inverse dynamics and static optimization.
Calculated muscle forces and activations during various sit-to-stand patterns.
Evaluated robustness using sensitivity analyses and considered muscle physiological cross-sectional area and specific tension.

Main Results:

A distinct threshold was identified for the total muscle force of hip and knee extensors.
This total extensor force is proposed as an appropriate index for minimum required muscle force in STS.
The minimum required total force was quantified within the range of 35.3–49.2 N/kg.

Conclusions:

The total force exerted by hip and knee extensors is a valid indicator of the minimum force required for sit-to-stand.
The identified force range provides a quantitative benchmark for assessing muscle function during STS.
Muscle force requirements are interdependent, highlighting the importance of considering synergistic and antagonistic muscle contributions.