If comparing two individuals, with all variables being equal, the person with more lean muscle mass will have a higher basal metabolic rate, and therefore, a lower metabolic age in comparison to those with the identical chronological age.
[3] The research on which the concept of metabolic age is based began with Alfred Joseph Clark in 1927.
Clark found that the pulse rate of different species of animal varied with body size to the power of −0.27.
Other researchers went on to find that other biological rates varied to the same, or a similar, coefficient.
is a dimensional coefficient that depends on the units of time being used Taylor chose the term metabolic age as a nod to the work of Max Kleiber who used the term metabolic time.