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Anatomical Positions

Anatomical Positions

In anatomy, several standard anatomical positions are used as references for describing the position and orientation of different body parts. These positions help provide a common frame of reference when discussing anatomical structures. The anatomical position is the standard reference point for describing the body's position and orientation. In this position:
The body is upright, facing forward, and standing erect.
The feet are parallel and flat on the floor.
The arms are hanging by the...

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Related Experiment Video

Updated: Oct 9, 2025

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

Postural Variabilities Associated with the Most Comfortable Sitting Postures: A Preliminary Study.

Yi-Lang Chen¹, You-Chun Chan¹, Li-Peng Zhang¹

¹Department of Industrial Engineering and Management, Ming Chi University of Technology, New Taipei 24301, Taiwan.

Healthcare (Basel, Switzerland)

|December 24, 2021

Summary

This summary is machine-generated.

Comfortable sitting postures show high variability in joint angles across different chairs. Gender and chair type significantly influence trunk angle, with women exhibiting greater backward trunk extension.

Keywords:

chair type global joint angle perception postural variability sitting comfort

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Area of Science:

Ergonomics and Human Factors
Biomechanics
Occupational Health

Background:

Comfortable sitting posture is crucial for well-being and productivity.
Previous research often assumes static comfortable postures, overlooking inherent variability.
Understanding postural adjustments on different chair types is essential for ergonomic design.

Purpose of the Study:

To investigate postural variabilities during self-perceived comfortable sitting.
To analyze the impact of chair adjustability and gender on sitting posture.
To provide insights for designing furniture that minimizes prolonged static loading.

Main Methods:

Twelve participants (6 male, 6 female) sat on three chair types: stool, computer chair, and gaming chair.
Global joint angles were recorded to quantify postural variability.
Participants adjusted chairs to their most comfortable perceived posture before data collection.

Main Results:

Unexpectedly high postural variabilities (approx. 9.4-11.1°) were observed across all chair types.
Gender and chair type significantly affected trunk angle (p < 0.01, p < 0.001).
Women demonstrated greater backward trunk extension compared to men.

Conclusions:

Self-perceived comfortable sitting is characterized by significant postural variability.
Ergonomic chair design should account for dynamic postural adjustments and gender-specific differences.
Minimizing prolonged static loading through adaptive or memory-aided designs is recommended.