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Energy cost of treadmill walking
1Faculty of Physical Education and Sports, Charles University, Prague, Czech Republic.
The Journal of Sports Medicine and Physical Fitness
|June 1, 1997
Summary
Simple models can accurately predict the energy cost of walking (VO2) in adults. The study found an optimal walking speed around 4 km/h that minimizes energy expenditure.
Area of Science:
- Exercise Physiology
- Biomechanics
- Human Kinetics
Background:
- Energy cost of walking (VO2) prediction models have existed for decades.
- Previous models for predicting VO2 during treadmill walking were published 29 years ago.
Purpose of the Study:
- To assess the accuracy of simple models in predicting the oxygen uptake (VO2) during treadmill walking.
- To compare different mathematical models for estimating walking energy expenditure.
Main Methods:
- Evaluated 87 adult males (19-62 years) on a motorized treadmill.
- Tested walking speeds ranging from 3 to 12 km/h at a 0% grade.
- Applied linear, two-compartment linear, polynomial, and monoexponential models to VO2-speed data.
Main Results:
- Linear models showed varying accuracy across different speed ranges (r=0.812 to 0.932).
- Polynomial and monoexponential models also provided significant predictions (r=0.891 and r=0.861, respectively).
- All models demonstrated high statistical significance (p < 0.001).
Conclusions:
- The models offer reasonable estimates of treadmill walking energy requirements in adults at a steady state of oxygen uptake.
- A U-shaped curve for the coefficient of energy cost of walking was observed, with a minimum at approximately 4 km/h.
- This suggests the existence of an "optimal" walking speed that minimizes energy expenditure.