Cortical activity differs between position- and force-control knee extension tasks

Poortvliet, Peter C., Tucker, Kylie J., Finnigan, Simon, Scott, Dion, Sowman, Paul and Hodges, Paul W. (2015) Cortical activity differs between position- and force-control knee extension tasks. Experimental Brain Research, 233 12: 3447-3457. doi:10.1007/s00221-015-4404-8


Author Poortvliet, Peter C.
Tucker, Kylie J.
Finnigan, Simon
Scott, Dion
Sowman, Paul
Hodges, Paul W.
Title Cortical activity differs between position- and force-control knee extension tasks
Journal name Experimental Brain Research   Check publisher's open access policy
ISSN 1432-1106
0014-4819
Publication date 2015-08-21
Sub-type Article (original research)
DOI 10.1007/s00221-015-4404-8
Open Access Status Not Open Access
Volume 233
Issue 12
Start page 3447
End page 3457
Total pages 11
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2016
Language eng
Abstract Neural control differs between position- and force-control tasks as evident from divergent effects of fatigue and pain. Unlike force-control tasks, position-control tasks focus on a postural goal to maintain a joint angle. Cortical involvement is suggested to be less during postural control, but whether this differs between position- and force-control paradigms remains unclear. Coherence estimates the functional communication between spatially distinct active regions within the cortex (cortico-cortical coherence; CCC) and between the cortex and muscles (corticomuscular coherence; CMC). We investigated whether cortical involvement differed between force-control and more posturally focused, position-control tasks. Seventeen adults performed position- and force-control knee extensor efforts at a submaximal load (10 % maximum voluntary contraction). Surface electromyography was recorded from the right knee extensor and flexor muscles and brain activity using electroencephalography (EEG). CCC and CMC in the beta (13–30 Hz) and gamma (30–45 Hz) frequency bands were calculated between combinations of intra- and inter-hemispheric pairs of electrodes, and between four EEG electrodes that approximated the left motor cortical area, and right knee extensor EMG, respectively. Differences in EEG power and muscle activity were also calculated. CCC was greater across distributed regions in the force-control task. Beta EEG power in the left hemisphere was higher for the position-control task. Although averaged CMC data differed between tasks, there was no task difference for individual CMC data. Muscle activity and force did not differ between tasks. The results demonstrate differential cortical contributions to control force- versus position-control tasks. This might contribute to differences in performance outcomes of these tasks that have been shown previously.
Keyword Cortico-cortical coherence
Corticomuscular coherence
Electroencephalography
Electromyography
Knee extensor muscles
Postural control
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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