Table 2 Relationship of ACC data to the respective criterion measure (oxygen uptake, mLkgmin)

	PCC r
Activity (VMU/ct.sec-1)	.91 *
Activity (VMU/ct.mean 10 sec-1)	.94 *

A tabular report of validity statistics: Pearson’s Product Correlation Coefficient (PCC) for ACC Vector Magnitude Units (VMU) versus oxygen uptake, ml.min.kg.* p < 0.01