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Related Experiment Video

Updated: May 9, 2026

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

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

Published on: November 11, 2022

Is active sitting as active as we think?

Wilhelmus J A Grooten¹, David Conradsson, Björn O Äng

¹a Department of Neurobiology , Care Sciences and Society, Karolinska Institute , Stockholm , Sweden.

|July 11, 2013

Summary

This summary is machine-generated.

Active sitting on stools and standing reduce postural sway and muscle activity compared to conventional office chairs. These active postures offer biomechanical benefits for healthy individuals during keyboard tasks.

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Last Updated: May 9, 2026

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Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

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Published on: August 30, 2016

Area of Science:

Biomechanics
Ergonomics
Human Movement Science

Background:

Conventional office chairs are widely used, but their impact on posture and muscle activity is debated.
Active sitting is proposed as an alternative to mitigate sedentary behavior risks.
Understanding the biomechanical differences between sitting postures and standing is crucial for workplace health.

Purpose of the Study:

To compare the biomechanical characteristics of active sitting (stool without backrest), conventional office chair sitting, and standing.
To evaluate postural sway and trunk muscle activity during a keyboard-writing task under different conditions.

Main Methods:

Thirteen healthy participants performed a keyboard-writing task.
Biomechanical data were collected using motion capture, force plates, and surface electromyography.
Four conditions were tested: stable and unstable stool sitting, conventional office chair sitting, and standing.

Main Results:

Active sitting and standing showed similar body segment positions, postural sway, and trunk muscle activity.
All sitting conditions exhibited reduced vertical upper body alignment, less anterior pelvic tilt, and larger hip angles compared to standing.
Unexpectedly, active sitting and standing conditions resulted in lower muscle activity and reduced postural sway (total, velocity, M/L, A/P) than conventional office chair sitting.

Conclusions:

Active sitting on stools and standing promote more favorable biomechanical outcomes than conventional office chairs.
Encouraging active sitting and standing may reduce the physical strain associated with prolonged desk work.
These findings suggest a potential for improved ergonomic strategies in office environments.