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Related Experiment Video

Updated: Jul 14, 2026

The Impact of Motor Task Conditions on Goal-Directed Arm Reaching Kinematics and Trunk Compensation in Chronic Stroke Survivors

The Impact of Motor Task Conditions on Goal-Directed Arm Reaching Kinematics and Trunk Compensation in Chronic Stroke Survivors

Published on: May 2, 2021

Trunk posture affects upper extremity function of adults.

Glen Gillen¹, Chanie Boiangiu, Michelle Neuman

¹Columbia University Programs in Occupational Therapy, 710 West 168th Street-8th Floor, New York, New York 10032, USA. GG50@Columbia.edu

Perceptual and Motor Skills

|June 15, 2007

Summary

Maintaining a neutral seated trunk posture enhances upper extremity function for daily tasks. Flexed or laterally flexed postures significantly slow performance, particularly for the dominant hand in specific activities.

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Area of Science:

Occupational Therapy
Biomechanics
Human Factors

Background:

Seated work is prevalent, potentially impacting physical function.
Trunk posture is a key factor in biomechanical efficiency.
Understanding posture's effect on upper extremity function is crucial for ergonomics.

Purpose of the Study:

To investigate the influence of seated trunk postures on upper extremity (UE) function.
To compare UE performance in neutral, flexed, and laterally flexed trunk positions.

Main Methods:

59 adults participated in the study.
The Jebsen Taylor Hand Function Test was administered.
Participants completed tasks in three distinct seated trunk postures.

Main Results:

Significant performance decrements were observed in flexed and laterally flexed postures compared to neutral.
Dominant hand tasks (feeding, lifting cans) were slower in non-neutral postures.
Nondominant hand tasks (small object manipulation, page turning) and total scores were slower in the flexed posture.

Conclusions:

A neutral trunk posture generally optimizes upper extremity performance in seated activities.
The impact of trunk posture on UE function varies depending on the specific task.
Findings support ergonomic recommendations for neutral postures during daily activities.