The role of oxygen in performance

VO₂ max is defined as

• the maximum amount of oxygen an individual can consume in a minute.

• the maximum amount of oxygen an individual can consume every breath.

• a measure of overall sporting performance.

• a measure of oxygen debt volume.

Lactate turn point is best described as the point at which

• oxygen consumption meets oxygen demand and OBLA occurs.

• lactic acid accumulates in the working muscles causing negative effects.

• begins to accumulate in the muscles at a faster rate than it can be removed.

• respiration decreases to reduce the lactate build up in the muscles.

Which of the following organs in the body contributes directly to the delivery of oxygen to working muscles?

• liver

• heart

• bones

• skin

Changes that occur in the body in response to training are known as

• physiological growth

• physiological improvements

• physiological developments

• physiological adaptations

VO₂ max is a strong indicator of an individual’s

• aerobic capacity

• fitness

• lactate turn point

• oxygen deficit

Blood lactate

• is metabolised from sugar.

• prevents the resynthesis of ATP.

• is derived from oxygen in the bloodstream.

• is a major contributor to fatigue during high intensity physical activities.

An athlete wanting to train in the lactate threshold training zone should do so at between

• 70 and 75% of their maximum heart rate.

• 80 and 85% of their maximum heart rate.

• 90 and 95% of their maximum heart rate.

• 95 and 100% of their maximum heart rate.

The graph shows the blood lactate concentration for two male athletes (i.e. Athlete A and Athlete B) at various exercise intensities. Athlete B reaches his lactate threshold at approximately:

• 25% VO₂ max.

• 50% VO₂ max.

• 75% VO₂ max.

• 100% VO₂ max.

Training in the anaerobic training zone can

• enhance aerobic capacity as well as anaerobic fitness components such as speed and power.

• only enhance anaerobic fitness components such as speed and power.

• only enhance aerobic capacity.

• enhance aerobic capacity if the zone is maintained for durations of greater than 20 minutes.

Which of the following is an example of an acute physiological adaptation that takes place in response to exercise?

• sweating

• increased lung capacity

• increased size and strength of the heart

• increased muscle mass