The relationship between masseter force and masseter electromyogram during mastication in the monkey Macaca fascicularis.


Journal Article

In five adult monkeys, electromyograms (EMGs) were recorded from bipolar surface electrodes positioned over the superficial masseter and from bipolar fine-wire electrodes within both the superficial and deep masseter. Relative masseter force was estimated by measuring surface bone strain from the lateral aspect of the zygomatic arch using rosette strain gauges. Multiple step-wise regression procedures demonstrated that peak values of the averaged masseter EMG could often explain a considerable amount of the variation of peak relative masseter force during mastication, i.e. r2 values ranged from 0.23 to 0.96 for the various single-electrode models and R2 values ranged from 0.78 to 0.96 for the various multiple-electrode models. The r2 values for relative masseter force and EMG data from the surface electrodes ranged from 0.69 to 0.96, and, on average, EMG data from surface electrodes provided somewhat more information about overall relative muscle force than data from fine-wire electrodes. The R2 values for a two-electrode model, consisting of data from surface electrodes over the superficial masseter and fine-wire electrodes in the posterior portion of the deep masseter, ranged from 0.78 to 0.95. The latency between the averaged surface EMG and relative muscle force was determined and the data indicated that the surface EMG usually preceded muscle force. This latency tended to decrease gradually throughout the entire power stroke of mastication. At peak values, the surface EMG preceded muscle force by about 22 ms. Towards the end of the power stroke, i.e. the 25% of peak values during unloading, muscle force may actually precede the average EMG.

Full Text

Cited Authors

  • Hylander, WL; Johnson, KR

Published Date

  • January 1989

Published In

Volume / Issue

  • 34 / 9

Start / End Page

  • 713 - 722

PubMed ID

  • 2624563

Pubmed Central ID

  • 2624563

Electronic International Standard Serial Number (EISSN)

  • 1879-1506

International Standard Serial Number (ISSN)

  • 0003-9969

Digital Object Identifier (DOI)

  • 10.1016/0003-9969(89)90078-2


  • eng