In Reply: We acknowledge that the equation
Mr Schwark presents for conversion of DASI score to estimated peak VO2 was used in the original development of the DASI.1 However, that conversion had been optimized for the
original study group of 50 healthy individuals. The raw DASI score is intended
to estimate peak VO2,1 and
1 MET is defined as approximately 3.5 mL/kg per minute VO2. The raw DASI score has been validated in the Women’s Ischemic
Syndrome Evaluation (WISE) cohort and shown to correlate with treadmill-derived
METs.2 Furthermore, among women who had treadmill
testing in the WISE cohort, we found better correlation (r = 0.35 vs 0.20) and lower median difference (0.30 vs 0.60)
between treadmill METs and DASI METs when converting by dividing DASI score
by 3.5 than when using the conversion formula from the original DASI article.
Therefore, we believe that this simpler conversion method is more appropriate
for our cohort.
Wessel TR, Pepine CJ, Shaw LJ, Merz CNB. Relationship of Fitness and Body Mass Index to Cardiac Disease—Reply. JAMA. 2005;293(2):161-162. doi:10.1001/jama.293.2.162-a