Your ground contact time running is a metric that measures the length of time of the “stance phase“ of the gait cycle, which is the weight-bearing portion of the running stride.
But what is ground contact time balance when running? What is a good ground contact time running? How can you decrease your running ground contact time?
In this article, we will discuss what ground contact time with running refers to, why it matters, what a good ground contact time for runners is, and tips to help improve your running ground contact time.
What Is Ground Contact Time Running?
A runner’s ground contact time, or GCT for short, refers to the length of time that your foot is in contact with the ground during your running stride.
From the point at which your foot first makes contact with the ground, which is called either initial contact or ground contact when referring to the running gait cycle, until the same foot is up into the air after push-off constitutes the foot’s total ground contact time.
If you land on your heel or rear foot, the stance phase involves the entire rollover along the foot. Your weight travels from your heel towards your toe for a push-off, a process known as the heel-to-toe transition.
Ground contact time running is measured in milliseconds (ms).
There is 1000 ms in one second, so a GCT running of 500 milliseconds means that your foot is in contact with the ground for half a second from the time you land on your foot at initial contact (or heel strike) until you push off at toe-off.
What Is Ground Contact Time Balance Running?
Ground contact time balance, or GCT balance, while running further picks apart your ground contact time running by comparing the ground contact time between your right foot vs. left foot when you run.
Essentially, a runner’s GCT balance is a measure of the symmetry between the right and left sides of the body when the foot is in contact with the ground.
Running is a unilateral but reciprocal motion which means that the right and left sides of the body are performing the exact same movement pattern but in opposition to one another.
When your right foot lands down on the ground when you run, the left foot is airborne in the swing phase. When the left foot makes ground contact when you run, the right foot is up in the swing phase.
The reason that GCT balance is so important for a runner is that symmetry in your running stride helps improve your efficiency and running economy, and it reduces the risk of injuries.
You want to have the right and left sides of your body functioning as mirror images of one another in a reciprocal fashion.
Any deviations in the movement arc or in metrics such as the ground contact time in the right foot vs left foot when running introduces a higher risk for injuries and compromised performance.
This is because if you do not display GCT balance running, it means that one side of your body will be doing more work or contending with higher forces or forces for a longer period of time than the other side of your body.
Ultimately, a 50/50 ground contact time balance is ideal, though a 51/49 GCT balance is also okay.
Anything more than a 2% differential between your right and left foot indicates poor GCT balance running.
What Is a Good Ground Contact Time Running?
As with most running metrics related to the dynamics of your running stride, such as stride length and cadence, there isn’t a universal best ground contact time running.
Ultimately, the shorter your GCT running, the faster you will be running, which tends to be ideal.
However, as discussed, the GCT balance is equally important, if not more important, than just your average ground contact time running.
Consider, for example, two different recreational runners.
Imagine that both runners run 5 miles and they are wearing running watches that can measure ground contact time running.
Let’s say that runner A has an average ground contact time running of 300 milliseconds. Meanwhile, runner B has an average of 250 milliseconds.
If the analysis ends there, it would be easy to assume that runner B has the better ground contact time.
After all, in theory, the shorter the length of time that your foot is stuck on the ground supporting your weight, the greater your potential to be running faster and actually making forward motion.
However, the average GCT running isn’t so black and white. This is again where the GCT balance comes into play.
When we are looking at the average ground contact time running between these two runners, we are looking at the average across both feet for the entire 5-mile run.
But, if we were able to do a deeper analysis and look at the right foot vs. left foot ground contact time when running, we might discover another layer that would change the answer as to the best GCT.
If runner A has an average GCT running of 300 ms and is indeed demonstrating excellent ground contact time balance while running, this means that both the right foot and left foot would have approximately a 300 ms GCT independently if we analyzed each foot individually across the 5-mile run.
Let’s say that runner B has a very poor running GCT balance. This means that he or she is displaying an overt lack of symmetry between the right and left sides of the body in terms of ground contact time.
This can be evidenced by an imbalance or lopsided running stride. Even if it is not apparent to the naked eye, if the runner gets a video gait analysis that slows down the running form frame by frame, we would be able to see that the right foot might be spending significantly more time on the ground than the left foot for each complete gait cycle.
Thus, while the overall average GCT running for this runner might be 250 ms, the individual GCT for the right foot vs. the left foot could be quite disparate.
Just to simplify the math, the GCT on the right foot might be 350 ms, and the GCT of the left foot might be just 150 ms.
This will still average out to a faster average, but the GCT balance would be very poor, with the left foot GCT 200 ms faster than the right foot GCT running.
Ultimately, in this particular comparison, even though the average ground contact time is objectively faster for runner B, the GCT of runner A is actually probably healthier and more efficient given the significantly better GCT balance.
Although there aren’t massive studies or research reviews that have looked at the typical ground contact time running for runners of all ability levels, generally speaking, a good GCT for recreational runners is between 200 and 300 milliseconds.
Elite runners demonstrate a faster GCT than recreational runners, often even faster than 200 ms.
Sprinters may have the best GCT running because the entire race performance hinges upon maximizing forward velocity.
How to Decrease GCT Running and Improve GCT Balance
There are various strategies that can help improve your ground contact time running.
The results found that when runners were able to get immediate feedback on the wearable device, they were able to reduce their vertical oscillation (bouncing or up and down movement) along with other biomechanical factors of the running stride.
Some of the best GPS running watches with high-tech capabilities are now able to provide not only basic GCT running averages but also your GCT balance while running.
Getting real-time feedback may help bring awareness to the symmetry in your running stride as well as your “quickness“ on your feet, which can improve GCT balance and average ground contact time, respectively.
Running drills like explosive strides and fast feet drills, such as the ones that American football players use, or envisioning running on hot coals can help cue your brain to be as light and quick on your feet as possible.
Lastly, working with a metronome app or trying to deliberately increase your running cadence can potentially help reduce running ground contact time.
For more information on running cadence, check out our guide here!