Related Experiment Video
Updated: Jun 30, 2026
The Impact of Motor Task Conditions on Goal-Directed Arm Reaching Kinematics and Trunk Compensation in Chronic Stroke Survivors
Published on: May 2, 2021
Effects of trunk restraint combined with intensive task practice on poststroke upper extremity reach and function: a
Michelle L Woodbury1, Dena R Howland, Theresa E McGuirk
1Brain Rehabilitation Research Center, Malcom Randall Veterans Administration Medical Center, Department of Occupational Therapy, College of Public Health and Health Professions, University of Florida, Gainesville, FL 32610, USA. mwoodbur@phhp.ufl.edu
Intensive task practice using trunk restraint improved poststroke reaching kinematics and coordination. This method enhanced shoulder and elbow movement, leading to straighter arm trajectories and better functional ability.
Area of Science:
- Neurorehabilitation
- Biomechanics
- Motor Control
Background:
- Poststroke reaching often involves compensatory trunk motion and abnormal shoulder-elbow coordination.
- Limited research addresses arm-trunk kinematics during rehabilitation.
- Short-term practice preventing trunk motion improves kinematics, but long-term effects are unknown.
Purpose of the Study:
- To compare intensive task practice with and without trunk restraint for poststroke reaching.
- To evaluate effects on reaching kinematics and functional arm ability.
Main Methods:
- 11 individuals with chronic stroke were randomized into two groups.
- Both groups underwent 14 days of constraint therapy and 10 days of supervised practice.
- One group used a trunk restraint during practice, while the other did not.
Main Results:
- The trunk-restraint group showed straighter reach trajectories and reduced trunk displacement.
- This group also improved voluntary shoulder flexion and elbow extension range of motion.
- Both groups improved functional arm ability, but only the restraint group showed kinematic improvements.
Conclusions:
- Intensive task practice preventing compensatory trunk movements can improve reaching kinematics.
- Promoting shoulder flexion-elbow extension coordination may reinforce normal movement patterns.
- Trunk restraint during practice may be a key strategy for optimizing upper extremity recovery after stroke.
