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Comment on subject's aerobic efficiency and fitness

Aerobic efficiency and fitness can be estimated using the following formula:

INDEX = (Duration of exercise in seconds) x100 =
2(sum of first 3 pulse counts in recovery)

below 55 = poor
55-64 = low average
65-79 = average
80-89= good
90+= excellent


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I have made some adjustments and critiqued, hopefully without being to critical, ...