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Ventilatory threshold during incremental running can be estimated using EMG shorts.

Olli Tikkanen1, Min Hu, Toivo Vilavuo

  • 1Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, Finland. olli.tikkanen@megaemg.com

Physiological Measurement
|March 16, 2012
PubMed
Summary

Textile electromyography (EMG) shorts can detect the second ventilatory threshold (VT2) during running. This method is more valid for athletes than recreational runners, offering practical intensity monitoring for experienced runners.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biomedical Engineering

Background:

  • The second ventilatory threshold (VT2) is a key indicator of endurance exercise intensity.
  • Accurate detection of VT2 is crucial for training prescription and performance monitoring.
  • Current methods for VT2 detection can be invasive or require specialized equipment.

Purpose of the Study:

  • To investigate the efficacy of textile electromyographic (EMG) electrodes integrated into shorts for detecting VT2 during incremental treadmill running.
  • To compare the accuracy of EMG-based threshold (EMG(T)) detection with traditional methods like blood lactate accumulation (OBLA) and gas exchange (VT2) in athletes and recreational runners.
  • To assess the practical applicability of EMG shorts for real-time intensity monitoring in runners.

Main Methods:

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  • Thirteen recreationally active (REC) and eight endurance athletes underwent a VO(2max) test on a treadmill with incremental speed.
  • Electromyography (EMG) signals from shorts, heart rate, blood lactate, and respiratory gases were continuously monitored.
  • VT2, OBLA, and EMG(T) were determined using established criteria and statistical analysis (ANOVA).

Main Results:

  • In athletes, OBLA, VT2, and EMG(T) occurred at similar intensities (56, 59, and 62 mL·kg(-1)·min(-1), respectively) with no significant differences.
  • In REC participants, OBLA, VT2, and EMG(T) also occurred at similar intensities (40, 43, and 41 mL·kg(-1)·min(-1), respectively).
  • Strong correlations were found between EMG(T) and VT2 (r=0.86) and between EMG(T) and OBLA (r=0.84) for the entire group. Limits of agreement were narrower in athletes.

Conclusions:

  • Textile EMG shorts can reliably estimate VT2 during incremental running, particularly in endurance athletes.
  • The validity of EMG-based VT2 estimation is higher in trained athletes compared to recreational runners.
  • EMG garments offer a practical, non-invasive tool for experienced runners to monitor their training intensity relative to VT2 in real-time.