Which of the following conditions is included in relative contraindications to exercise?

In the context of exercise prescriptions and assessing contraindications, relative contraindications refer to conditions that may require careful consideration or modification of exercise programs rather than an outright prohibition. Severe atrial hypertension specifically represents a situation where exercise might still be safe, but caution is warranted based on the individual's unique health status and response to physical activity.

While managing severe atrial hypertension, it is crucial to monitor the individual closely during exercise, as there may be a risk of major complications. This approach allows for the possibility of engaging in physical activity while ensuring that potential health risks are mitigated through careful management.

On the other hand, conditions like chronic infectious disease, moderate stenotic valvular heart disease, and electrolyte abnormalities might present more direct threats that could necessitate more urgent restrictions on exercise or comprehensive evaluation prior to engaging in physical activity. Thus, these conditions are typically considered more absolute in prohibiting exercise than relative contraindications like severe atrial hypertension.