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Group Fitness Instructor

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The skilled Group Fitness Instructor will remain aware of the levels of exertion demonstrated by his or her class members. One of the indications of exertion which participants should be taught are the signs that accompany the first ventilatory threshold. Which of the following is the BEST representation of the first ventilatory threshold?
  1. A level of intensity at which the body’s need for oxygen is met primarily through an increase in tidal volume
  2. A level which represents the highest sustainable level of exercise intensity
  3. A level of intensity at which lactic acid begins to accumulate in the blood stream
  4. A level of intensity at which lactic acid accumulates faster than the body can buffer and remove it
Explanation
Answer: C - The first ventilatory threshold - also referenced as the “crossover” point - is the point at which the body starts to accumulate lactic acid in the blood stream. At this level of exercise, the body is no longer able to meet its oxygenation needs through taking deeper breaths (increased tidal volume) and must also increase the rate of respiration. The exerciser starts to feel uncomfortable and must breathe more often between words.
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