Outdoor Reproducibility of a 1-km Treadmill Walking Test to Predict Peak Oxygen Uptake in Cardiac Patients

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Abstract

Introduction:

The aim of this study was to determine whether the 1-km treadmill walking test, previously developed to predict peak oxygen uptake (

Introduction:

JOURNAL/jcprh/04.02/01273116-201709000-00009/math_9MM1/v/2017-08-29T142559Z/r/image-png

Introduction:

O2peak) in stable cardiac outpatients, could be reproduced outdoors.

Methods:

Fifty male cardiac outpatients performed the 1-km walking test on a treadmill and on a flat track within 1 week.

Methods:

JOURNAL/jcprh/04.02/01273116-201709000-00009/math_9MM2/v/2017-08-29T142559Z/r/image-png

Methods:

O2peak was estimated for both testing conditions considering age, height, weight, walking speed, and heart rate.

Results:

Average walking speed was slightly higher during outdoor conditions (5.73 ± 0.77 km/h vs 5.55 ± 0.84 km/h), whereas mean heart rates were similar for both testing conditions (102 ± 18 beats/min vs 103 ± 16 beats/min).

Results:

JOURNAL/jcprh/04.02/01273116-201709000-00009/math_9MM3/v/2017-08-29T142559Z/r/image-png

Results:

O2peak values for treadmill and outdoor tests were not significantly different (26.4 ± 4.1 mL/kg/min vs 26.8 ± 4.5 mL/kg/min) and were strongly correlated (r = 0.93, P < .0001). The slope and the intercept of the

Results:

JOURNAL/jcprh/04.02/01273116-201709000-00009/math_9MM4/v/2017-08-29T142559Z/r/image-png

Results:

O2peak values were not different from the line of identity.

Conclusions:

This moderate and perceptually regulated 1-km walking test administered outdoors gives similar results compared with a similar test performed on a treadmill. Therefore,

Conclusions:

JOURNAL/jcprh/04.02/01273116-201709000-00009/math_9MM5/v/2017-08-29T142559Z/r/image-png

Conclusions:

O2peak can be reasonably estimated using both testing modalities. This suggests that the outdoor 1-km test can be applied for indirect estimations of cardiorespiratory fitness in an outpatient setting.

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