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In: Anatomy and Physiology

Prescribing exercise intensity can be achieved using many physiological variables. One of the most useful manners...

Prescribing exercise intensity can be achieved using many physiological variables. One of the most useful manners may be to use respiratory gas exchange measurements. First describe exercise intensity zones based upon ventilatory equivalents. Then relate the following: heart-rate zones, lactate threshold(s), and VO2max to these zones created using ventilatory equivalents.

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Exercise intensity zones based upon ventilatory equivalents include the following:

In healthy athletes performing the lower or whole-body exercise, blood lactate and gas exchange threshold relation is known in the diagnosis of endurance performance and in the prescription of systematic training with various exercise intensity zones. Two thresholds are commonly described includes

  • The aerobic threshold (AT) which is explained by the ventilatory threshold (VT) or the first lactate threshold (LT1) separates low from that of moderate-intensity exercise
  • The anaerobic threshold (ANT) which is explained by the respiratory compensation threshold (RCT) or the second lactate threshold (LT2) separates moderate from that of high-intensity exercise

Maximal oxygen consumption, heart rate deflection, ventilatory or lactate thresholds and maximum lactate steady state (MLSS) are main physiological evaluations in relation to endurance performance.

Heart rate and the zones are inversely proportional to each other. Lactate, as well as ventilatory thresholds, are the manifestations of underlying metabolic conditions where homeostasis or balance is lost. Example: VT1 (which is an anaerobic threshold or the intensity at which ventilation) and VCO2 increase parallelly.


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