What is Ground Contact Time?
Ground Contact Time (GCT) is the duration each foot spends in contact with the ground during walking or running. Shorter, symmetrical GCT typically indicates efficient CPG-driven gait and better running economy.
Key Points
- •Asymmetry — uneven GCT suggests CPG imbalance or compensation
- •Cadence — higher cadence usually shortens GCT
- •Surfaces — uneven terrain and minimalist footwear can recalibrate CPG and GCT
Why does Ground Contact Time matter?
Ground contact time matters because it reflects how quickly a runner absorbs and returns force with each step. Shorter contact times generally occur at faster speeds and are associated with using the elastic recoil of tendons and muscles.
It is one of several gait metrics used to describe running form, alongside cadence and vertical oscillation. It is closely tied to speed, so comparing values across different paces is misleading. Evidence linking a specific contact time to lower injury risk or better economy in an individual runner is limited.
How is Ground Contact Time measured?
It is measured as the time, usually in milliseconds, between a foot touching the ground and leaving it. Laboratory gold standards are force plates and high-speed motion capture, which detect foot strike and toe-off directly.
Outside the lab, sports watches, chest straps, and foot pods estimate it from accelerometer data. These estimates are practical for tracking trends but can differ from lab values and between devices. Terrain, shoes, fatigue, speed, and slope all change contact time, so comparisons are most useful under similar conditions.
In ONDA Life
The CPG article covers cadence hack and sensory override protocols that optimize ground contact time.