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  1. Grazzi, Giovanni MD
  2. Chiaranda, Giorgio MD
  3. Myers, Jonathan PhD
  4. Pasanisi, Giovanni MD
  5. Lordi, Rosario ES
  6. Conconi, Francesco MD, PhD
  7. Mazzoni, Gianni MD


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



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.



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).



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



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,



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.