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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biomedical Engineering

Background:

  • The aerobic-anaerobic transition is a critical exercise intensity marker.
  • Lactate threshold (TLac) is a common, invasive measure.
  • Non-invasive methods like ventilatory threshold (VT) and tissue saturation index (TSIT) offer alternatives.

Purpose of the Study:

  • To compare TLac with non-invasive VT and TSIT markers.
  • To assess the association between non-invasive measures and TLac.
  • To determine the utility of non-invasive markers for identifying the aerobic-anaerobic transition.

Main Methods:

  • Thirty-one competitive male athletes underwent graded incremental cycling.
  • Measurements included heart rate, TSI, gas exchange, and blood lactate concentration ([BLa]).
  • Thresholds (TLac, VT, TSIT) were identified using segmented linear regression.

Main Results:

  • TSIT was not significantly different from TLac (255±35 vs. 249±30 W, P>0.05).
  • Correlation between TSIT and TLac was moderate (r=0.55, ICC=0.54), indicating other influencing factors.
  • VT occurred at a significantly higher workload than TLac (271±35 vs. 249±30 W, P<0.001).

Conclusions:

  • TSIT shows potential as a non-invasive marker closely linked to TLac.
  • VT is less useful as it indicates an already passed aerobic-anaerobic transition.
  • Non-invasive markers are not consistently concurrent with TLac, suggesting multifactorial influences on the transition.