Relationship between Oxygen Consumption vs Plantar Pressure during Uphill Walking and Running

Abstract

Inclined walking and running are widely used in athletic training and rehabilitation, yet their combined effects on oxygen consumption (VO₂) and plantar pressure are not fully quantified. Uphill running (4.2 mph) at a 10% slope can reduce vertical loading rate by about 59% compared to level running (7.5 mph) at the same metabolic demand, suggesting potential benefits for reducing impact forces but with higher energy cost. Understanding this trade-off is essential for designing effective training, injury prevention, and rehabilitation programs. This study examines VO₂ and plantar pressure changes across two speeds (3.0 mph, 6.0 mph) and two inclines (0%, 10%). VO₂ was measured using the VO₂ Master analyzer, and plantar pressure with the Tekscan system. Five trials per condition were conducted in a single-subject design. Results showed a VO₂ increase of approximately 73% for walking and 33% for running when moving from 0% to 10% slope, accompanied by corresponding rises in energy cost. Plantar pressure shifted toward the forefoot at 10% incline, while 0% slope maintained a more even distribution. These findings provide relevant data to support performance optimization and rehabilitation strategies.