Related Experiment Videos
Oxygen uptake and efficiency related to external work rate during loaded walking
The Journal of Sports Medicine and Physical Fitness
|December 1, 1989
Summary
The horizontal treadmill method resulted in 8-15% higher oxygen uptake (VO2) compared to the vertical method. Step frequency remained consistent across both methods, indicating VO2 differences are due to loading technique.
Area of Science:
- Exercise Physiology
- Biomechanics
- Human Performance
Background:
- Treadmill tests commonly use vertical loading (changing slope) to control workload.
- A novel horizontal loading method, involving pulling a weight, has been developed.
Purpose of the Study:
- To compare oxygen uptake (VO2) between vertical and horizontal treadmill loading methods.
- To analyze step frequency and efficiency calculations under different loading conditions.
Main Methods:
- Subjects performed treadmill tests using both vertical and horizontal loading methods.
- Oxygen uptake (VO2) and step frequency were measured.
- Efficiency calculations (delta, per step, net) were analyzed.
Main Results:
- Oxygen uptake (VO2) was 8-15% higher with the horizontal method at equivalent workloads.
- This difference was statistically significant at 700 kpm/min (p < 0.05).
- Step frequency was unaffected by work rate or loading method.
Conclusions:
- The horizontal loading method elicits a higher VO2 response than the vertical method.
- Step frequency is not a significant factor in VO2 differences between methods.
- Established conditions allow for consistent efficiency calculations (approx. 23%) regardless of loading method.