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Related Experiment Video

Updated: Feb 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

Perceived task complexity of trunk stability exercises.

Megan McPhee¹, Kylie J Tucker², Alan Wan¹

¹The University of Queensland, Division of Physiotherapy, Brisbane, Australia.

Musculoskeletal Science & Practice

|June 23, 2017

Summary

This summary is machine-generated.

The abdominal hollow exercise was perceived as more mentally demanding and took longer to learn than the abdominal brace. These findings highlight differences in task complexity for trunk stability exercises.

Keywords:

Abdominal brace Abdominal hollow NASA-TLX Task sequencing

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Area of Science:

Biomechanics
Exercise Physiology
Rehabilitation Science

Background:

Perceived task complexity influences exercise adherence and skill acquisition.
Trunk stability exercises are common in low back pain management.
Differences in perceived complexity between trunk stability exercises are unstudied.

Purpose of the Study:

Investigate perceived task complexity of the abdominal brace and abdominal hollow exercises.
Compare mental, physical, and temporal demands, effort, and frustration between the two exercises.

Main Methods:

Cross-sectional study with 24 healthy participants.
Participants received first-time instruction in abdominal brace and hollow exercises.
NASA-Task Load Index used to rate perceived task complexity.

Main Results:

Abdominal hollow had higher perceived mental demand (p=0.01) and learning time (p<0.01) than the abdominal brace.
Abdominal brace induced greater mental demand and frustration when performed after the hollow.

Conclusions:

First evidence of differing perceived task complexity between common trunk stability exercises.
Task complexity differences may impact exercise selection for spinal stability.
Consider perceived difficulty when prescribing trunk stability exercises.