In sports and physical education, simply looking muscular does not mean a person is 'fit'. True fitness is determined by the strength of the heart and lungs. The Harvard Step Test is one of the oldest, most famous, and simplest scientific tests used worldwide to measure a person's cardiovascular endurance and how quickly their heart recovers after heavy exercise.
A highly fit athlete (like a marathon runner) will have a massive heart that pumps huge amounts of blood per beat. Therefore, their heart does not need to beat very fast during the test, and it slows down to a normal resting state almost immediately after they sit down.
The test is extremely stressful on the knees and ankles. People who are heavily overweight or have severe joint pain are strongly advised not to perform the Harvard Step Test.
To find the Fitness Index, the following formula is used: Fitness Index = (100 × Total duration of exercise in seconds) ÷ (2 × Sum of all three pulse counts)
The test officially stops at exactly 3 minutes. The assistant immediately starts taking the three resting pulse counts, but in the final formula, they will input '180 seconds' (3 mins) instead of the full '300 seconds' (5 mins).
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