Related Experiment Videos
A method for measuring vertical forces applied to the upper limb during sit-to-stand.
H C Turner1, R M Yate, G E B Giddins
1Centre for Orthopaedic Biomechanics, Department of Mechanical Engineering, University of Bath, Claverton Down, Bath BA2 7AY, UK. enphtc@bath.ac.uk
Summary
This study developed a system to measure upper limb loading during sit-to-stand. Vertical upper limb force was 20-30% of bodyweight, decreasing with higher chair seats or armrests.
Area of Science:
- Biomechanics
- Human Movement Analysis
Background:
- Understanding upper limb loading during daily activities like sit-to-stand is crucial for injury prevention and rehabilitation.
- Existing methods may not accurately capture dynamic forces experienced by the wrist and arm.
Purpose of the Study:
- To develop and validate a measurement system for estimating vertical upper limb loading during the sit-to-stand (STS) movement.
- To investigate the influence of chair geometry on upper limb forces during STS.
Main Methods:
- An instrumented chair with strain gauges and position sensors was used to measure forces transmitted through the armrests.
- A force plate recorded lower limb loading.
- Twenty healthy adults performed STS movements on chairs with varied geometries.
Main Results:
- The vertical force transmitted through each upper limb during STS was found to be approximately 20-30% of bodyweight.
- Increasing seat height or armrest height resulted in a small reduction in average vertical upper limb load.
Conclusions:
- The developed system provides a feasible method for quantifying upper limb loading during STS.
- Chair geometry, specifically seat and armrest height, can modulate upper limb forces, offering potential ergonomic insights.