Aerobics Trainer Exercise Physiology & Conditioning Flashcards

Which physiological variable BEST predicts endurance performance in aerobics?

Answer: Maximal oxygen uptake (VO2max)

VO2max represents the ceiling for aerobic energy production and is the strongest single physiological predictor of endurance performance.

A participant's RPE is 6 on the 6–20 Borg scale. This reflects exercise that is:

Answer: Very light to no exertion

On the original 6–20 Borg RPE scale, scores of 6–8 correspond to very light or no exertion at all.

Which adaptation to chronic aerobic training results in a lower resting heart rate?

Answer: Greater stroke volume due to cardiac hypertrophy

Aerobic training enlarges the left ventricle and increases stroke volume, so fewer heartbeats are needed to maintain adequate cardiac output at rest.

Lactic acid accumulation during high-intensity aerobics is BEST managed by:

Answer: Reducing intensity to allow oxidative clearance of lactate

Lactate is a fuel source and can be oxidized aerobically; reducing intensity allows muscles and the heart to clear it via the Cori cycle and oxidation.

Which factor is MOST likely to cause rhabdomyolysis in an aerobics class participant?

Answer: Sudden extreme workout volume in an unconditioned individual

Rhabdomyolysis results from massive muscle cell breakdown, most often when unconditioned individuals are subjected to excessive exercise volume or intensity.

During aerobics training, the 'talk test' is considered a practical indicator of:

Answer: Aerobic vs. anaerobic threshold

The talk test identifies the ventilatory threshold: moderate exercise allows comfortable conversation, while intensity above threshold makes continuous speech difficult.

What is the primary role of mitochondria in aerobic energy production?

Answer: Synthesizing ATP via oxidative phosphorylation using oxygen

Mitochondria are the sites of the citric acid cycle and electron transport chain, where the majority of ATP is produced using oxygen.