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Related Experiment Video

Updated: Jun 28, 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

Interaction torque contributes to planar reaching at slow speed.

Hiroshi Yamasaki¹, Yoshiyuki Tagami, Hiroyuki Fujisawa

¹Department of Physical Therapeutics, School of Nursing and Rehabilitation, Showa University, 1865 Toka-ichiba, Midori-ku, Yokohama, 226-8555, Japan. yamasaki@nr.showa-u.ac.jp

Biomedical Engineering Online

|October 23, 2008

Summary

Interaction torque (INT) significantly contributes to multi-joint movements, even at slow speeds. Muscle torques at the shoulder and elbow are not directly coupled, supporting theories of motor control flexibility.

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Area of Science:

Biomechanics
Neuroscience
Motor Control

Background:

The central nervous system (CNS) must organize joint dynamics for multi-joint movements, accounting for passive interactions between joints.
Previous research focused on quick movements, underestimating interaction torque (INT) at slower speeds.
The role of INT in multi-joint movements across various speeds remains unclear.

Purpose of the Study:

To investigate the contribution of interaction torque (INT) to planar reaching movements in healthy subjects across a wide range of speeds.

Main Methods:

Subjects performed reaching movements under three speed conditions.
3-D motion analysis captured joint position data.
Calculated torque components (muscle, interaction, gravity, net) using dynamic equations for shoulder and elbow.

Main Results:

The contribution of INT to net torque was speed-independent for both joints.
INT was additive to dynamic muscle torque (DMUS) at the shoulder but counteracted it at the elbow.
Elbow DMUS compensated for INT variability, ensuring consistent reach trajectories regardless of speed.

Conclusions:

Interaction torque is crucial even at slow movement speeds.
Joint muscle torques are not directly coupled for coordinated movement, supporting decentralized motor control theories.
A model linking joint torques and coordination is proposed, integrating muscle and passive torques.