First, the effects of age, gender, and ramp slope for each protocol
were assessed for each ergometer. After reviewing the exploratory
plots and results of the multiple liner regression, we reached the
conclusion that the effects of exercise protocol on parameters have
little impact, except in work rate (WR) and exercise time in the
treadmill ergometer test. The results were consistent with those of
previous reports [8,9].
Next, the effects of age, gender, and the interaction between
gender and age (a difference of slope against age between males
and females) were assessed through multiple liner regression. The
p-value from the F-test and the estimated coefficients for each effect
are summarized in Tables 3 and 4.