Table 4.

Relationship between maximum oxygen consumption, % of maximum heart rate and subjective perceived exertion

Intensity	% oxygen consumption	% maximum heart rate1	Subjective perceived exertion
Very light	< 20	< 35	< 10
Light	20-39	35-54	10-11
Moderate	40-59	55-69	12-13
High	60-84	70-89	14-16
Very high	> 85	> 90	17-19
Maximum	100	100	20

¹Maximum heart rate = 220-age. Available from: URL: American Diabetes Association. Physical Activity/Exercise and Diabetes. Diabetes Care 2004; 27 (Suppl 1): S58-S62.