Ground Contact Aerial Ratio
Compare running ground-contact and aerial times.
Description
Ground-contact/aerial ratio compares consecutive running phases.
Ground-contact/aerial ratio compares consecutive running phases. Contact fraction uses their combined duration as a separate denominator.1
Compare running ground-contact and aerial times.
When to use Ground Contact Aerial Ratio
Use this tool to compare running ground-contact and aerial times.
Prepare the measured movement, timing, load or preassigned score requested. Keep protocols, units, paired measurements and caller-selected thresholds consistent.
How to use Ground Contact Aerial Ratio and understand its results
- Prepare the measured movement, timing, load or preassigned score requested. Keep protocols, units, paired measurements and caller-selected thresholds consistent.
- Enter groundContactSeconds, aerialSeconds using the field table and calculation rules, then run the tool.
- Read contactToAerialRatio, contactFraction. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| groundContactSeconds | Ground contact seconds | number | Required |
| aerialSeconds | Aerial seconds | number | Required |
Enter positive phase durations seconds. Return ratio and fraction.
ratio=contact/aerial; fraction=contact/(contact+aerial) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| contactToAerialRatio | Contact to aerial ratio | number |
| contactFraction | Contact fraction | number |
{
"input": {
"groundContactSeconds": 0.2,
"aerialSeconds": 0.1
},
"output": {
"contactToAerialRatio": 2,
"contactFraction": 0.6666666666666666
}
}Limitations and assumptions
No cadence, stride identity, running economy or technique target is inferred.
Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Gait Duty Factor: Calculate stance duty factor and compare against a supplied walking cutoff. For a complementary task, use Reactive Strength Index: Compute reactive strength index from inferred jump height and ground contact time.
References
-
Ground Contact Aerial Ratio — tool.io
Similar or alternative tools
- Gait Duty Factor
Calculate stance duty factor and compare against a supplied walking cutoff.
- Reactive Strength Index
Compute reactive strength index from inferred jump height and ground contact time.