Article

PURPOSE: To determine whether a moderate 1-km treadmill walking test (1KTWT)
could be used to predict peak oxygen uptake VO(2)peak) in patients with
cardiovascular disease. METHODS: One hundred seventy-eight male patients, aged 38
to 83 years, completed a VO(2)peak treadmill test and a 1KTWT using a
self-regulated intensity of 11 to 13 of 20 on the Borg scale. Multivariable
regression analysis was used to develop equations for predicting VO(2)peak in a
development group (n = 110), both for subjects prescribed and not prescribed a
beta-blocking agent (BB/NBB, 66/44). These equations were then applied to a
cross-validation and reproducibility group (n = 68, BB/NBB, 37/31), who completed
the protocol twice within 2 weeks. RESULTS: Analysis from 1KTWT in the
development group showed that age, body mass index, walking speed, and heart rate
were the most potent predictors of VO(2)peak. Measured and predicted VO(2)peak
were not significantly different, and were strongly associated among both the NBB
(r = 0.81, P < .0001) and BB (r = 0.69, P < .0001) groups, with a mean residual
of approximately 1.0 mL.kg(-1).min(-1). When applied to the cross-validation and
reproducibility group, the equations similarly yielded strong associations (r =
0.64, P < 0.001 and r = 0.71, P < 0.001 for the NBB and BB groups, respectively),
with no significantly differences between measured and predicted VO(2)peak. Mean
test-retest differences for measured and predicted VO(2)peak were between 0.1 and
-0.5 mL.kg(-1).min(-1). CONCLUSIONS: Equations developed from the 1KTWT
accurately predicted VO(2)peak in patients with cardiovascular disease. The model
may represent a valid, low cost, and simple tool for indirect estimations of
cardiorespiratory fitness in an outpatient setting.

Langue : ANGLAIS

Tiré à part : OUI