Final answer:
The required intensity range of aerobic exercise for a low-risk adult meeting minimal physical activity levels is 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity aerobic activity per week, as per the HHS guidelines.
Step-by-step explanation:
The U.S. Department of Health and Human Services (HHS) recommends that adults aged 18 to 64 engage in at least 150 minutes of moderate-intensity aerobic activity per week, or 75 minutes of vigorous-intensity activity, or a combination of both. Moderate activities are such that an individual can talk but not sing during the activity, while vigorous activities are so intense that a person can only say a few words without stopping to breathe. This guideline aims to improve overall health and reduce chronic disease risk.
For someone who currently meets minimal physical activity levels and is considered low risk, starting within these guidelines would be appropriate. It is recommended that aerobic activity be spread throughout the week to consistently benefit the cardiovascular and muscular systems. Engaging in more than 300 minutes of moderate-intensity physical activity per week may result in additional health benefits and is beneficial for those aiming for weight loss and maintenance.
In summary, for a low risk adult who meets the minimal physical activity levels, the required intensity range of aerobic exercise should initially align with the HHS guidelines, which suggest 2.5 hours of moderate-intensity or 1.25 hours of vigorous-intensity aerobic physical activity each week. Over time, individuals may aim to exceed these minimum guidelines to further improve health outcomes.