Final answer:
The interindividual variability for predicting maximal heart rate from age is moderate (Option B) with a standard deviation of approximately 10 beats per minute, acknowledging the person-to-person differences in maximum heart rates that the common estimating formula does not fully capture.
Step-by-step explanation:
The question addresses the interindividual variability for predicting maximal heart rate (HR) from age, which refers to the differences between individuals in the relationship between their age and maximum heart rate. While a common formula for estimating maximum HR is 220 minus the individual's age, there is considerable variability in actual maximum HRs observed among individuals of the same age. This variability is known as interindividual variability.
Therefore, the correct answer would likely be B) Moderate, with a standard deviation of approximately 10 bpm. This choice indicates that while the formula provides a rough estimate, there is moderate variability from person to person in their maximum HR, which would be reflected by a relatively sizeable standard deviation from the estimate provided by the formula. This variability can be attributed to individual differences such as fitness levels, genetics, and overall cardiovascular health.