Correlation of cervical-inspiratory-muscle electromyography and oxygen uptake during treadmill walking

Respir Physiol Neurobiol. 2024 Jul:325:104266. doi: 10.1016/j.resp.2024.104266. Epub 2024 Apr 23.

Abstract

For measurements of exercise intensity, an individual's oxygen uptake (V̇O2) is measured with an exhaled gas analyzer that involves a mask, but exercise coaching would benefit if an individual's V̇O2 could be estimated with more easily obtained predictors. We investigated the predictability of V̇O2 by electromyography (EMG) of the neck inspiratory muscles. We analyzed the EMG results of the sternocleidomastoid (EMGst) and scalene (EMGsc) muscles of 14 healthy adults who performed a treadmill exercise load test. Their V̇O2, inspiratory flow rate, and heart rate were simultaneously recorded during the exercise. The exercise load test was performed twice at a ≥2-day interval. The first visit was an incremental exercise test, and the second was a repeated two-load exercise test at levels below and above the participant's ventilatory threshold (VT) as determined in the first test. We observed that the integrated EMG values for each exercise load showed partially significant positive correlations with the EMGst and EMGsc. However, the cervical inspiratory muscle EMGs did not show as high a correlation as the minute ventilation. These results indicate that (i) EMG of the cervical inspiratory muscles could be used to estimate V̇O2, but (ii) these EMG parameters alone should be considered insufficient for estimating V̇O2.

Keywords: Electromyography; Inspiratory muscle; Oxygen uptake; Treadmill; Ventilation threshold.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Electromyography*
  • Exercise Test* / methods
  • Female
  • Heart Rate / physiology
  • Humans
  • Male
  • Neck Muscles / physiology
  • Oxygen Consumption* / physiology
  • Respiratory Muscles / physiology
  • Walking* / physiology
  • Young Adult