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Published in: European Journal of Applied Physiology 9/2019

01-09-2019 | Joint Pain | Original Article

Experimental knee pain impairs joint torque and rate of force development in isometric and isokinetic muscle activation

Authors: David A. Rice, Jamie Mannion, Gwyn N. Lewis, Peter J. McNair, Lana Fort

Published in: European Journal of Applied Physiology | Issue 9/2019

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Abstract

Purpose

To investigate the effects of acute experimental knee joint pain on maximum force generation and rate of force development (RFD) of the quadriceps muscle during isometric and dynamic muscle activations.

Methods

The right knee of 20 healthy people was injected with hypertonic saline to create an acute pain experience. Measurements of maximum knee extensor torque during isometric, concentric, and eccentric contractions were undertaken using a Biodex dynamometer. The RFD was also examined during the isometric contractions. Quadriceps muscle activity was obtained using electromyography (EMG). The outcome measures were obtained at baseline, during pain, and after knee pain had resolved.

Results

Maximum joint torque and peak EMG were significantly reduced during pain, but there were no differences across the three types of contraction. The maximum RFD and rate of EMG rise were also reduced during pain, primarily at 50–100 ms post-contraction onset. The RFD and EMG rise were largely unaffected at later time periods following contraction onset (150–200 ms).

Conclusions

Acute joint pain has a similar impact on isometric and isokinetic contractions despite differences in neural control strategies. Joint pain also impairs rapid muscle activation and the RFD. These findings are important for people with musculoskeletal pain as it likely contributes to impairments in joint function in these populations.
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Metadata
Title
Experimental knee pain impairs joint torque and rate of force development in isometric and isokinetic muscle activation
Authors
David A. Rice
Jamie Mannion
Gwyn N. Lewis
Peter J. McNair
Lana Fort
Publication date
01-09-2019
Publisher
Springer Berlin Heidelberg
Keyword
Joint Pain
Published in
European Journal of Applied Physiology / Issue 9/2019
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-019-04195-6

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