Description
Calculate supplied contact and flight fractions of a positive cycle.
Movement geometry depends on coordinate registration, time origins, force signs and reference axes. A moment arm must already represent perpendicular leverage, a stride percentage has an endpoint convention, and a toe-to-heel projection differs from full Euclidean separation. Scalar results do not establish a movement diagnosis or a safe activity.
Calculate supplied contact and flight fractions of a positive cycle.
When to use this tool
Use Running Contact Flight Duty Factor when you already have contactSeconds, flightSeconds and need to calculate supplied contact and flight fractions of a positive cycle.
How to use the tool and how it works
- Enter contactSeconds, flightSeconds. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read cycleSeconds, contactDutyFactor, flightFraction. Use the output convention below.
Require both times>=0 with positive sum; return cycle sum, contact/sum and flight/sum.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| contactSeconds | Contact Seconds | Required. Finite number; minimum 0. |
| flightSeconds | Flight Seconds | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| cycleSeconds | Cycle Seconds | Required. Finite number. |
| contactDutyFactor | contactSeconds/(contactSeconds+flightSeconds); assumes these supplied phases exhaust the modeled cycle. | Required. Finite number. |
| flightFraction | Flight Fraction | Required. Finite number. |
{
"input": {
"contactSeconds": 0.2,
"flightSeconds": 0.3
},
"output": {
"cycleSeconds": 0.5,
"contactDutyFactor": 0.4,
"flightFraction": 0.6
}
}Limitations and assumptions
- The two categories are assumed exhaustive and nonoverlapping. No running events, multiple-leg contact convention, efficiency, injury risk or actual gait is assessed.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use calibrated motion, force and timing records with a complete biomechanical model. Check coordinate frames, axis normalization and sampling limitations before interpreting local distances, moments or phase values as performance or clinical findings.
References
Similar or alternative tools
- Stride Normalized Time Percent
Normalize a supplied sample time to a stride percentage.
- Joint Power Normalization Mass Factor
Normalize supplied joint power by a positive body mass.