Jump Phase Asymmetry
Calculate bilateral force asymmetry separately for propulsion and landing.
Description
Jump-phase force asymmetry compares sides relative to their mean, separately for propulsion and landing.
Jump-phase force asymmetry compares sides relative to their mean, separately for propulsion and landing. This definition can reach 200% with one zero side.1
Calculate bilateral force asymmetry separately for propulsion and landing.
When to use Jump Phase Asymmetry
Use this tool to calculate bilateral force asymmetry separately for propulsion and landing.
Prepare the measured movement, timing, load or preassigned score requested. Keep protocols, units, paired measurements and caller-selected thresholds consistent.
How to use Jump Phase Asymmetry 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 leftPropulsionForce, rightPropulsionForce, leftLandingForce, rightLandingForce using the field table and calculation rules, then run the tool.
- Read propulsionAsymmetryPercent, landingAsymmetryPercent. 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 |
|---|---|---|---|
| leftPropulsionForce | Left propulsion force (N) | number; minimum: 0 | Required |
| rightPropulsionForce | Right propulsion force (N) | number; minimum: 0 | Required |
| leftLandingForce | Left landing force (N) | number; minimum: 0 | Required |
| rightLandingForce | Right landing force (N) | number; minimum: 0 | Required |
Enter nonnegative forces with a positive sum in each phase. Return two percentage asymmetries.
asymmetry%=100|left−right|/((left+right)/2) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| propulsionAsymmetryPercent | Propulsion asymmetry (%) | number; minimum: 0; maximum: 200 |
| landingAsymmetryPercent | Landing asymmetry (%) | number; minimum: 0; maximum: 200 |
{
"input": {
"leftPropulsionForce": 1000,
"rightPropulsionForce": 900,
"leftLandingForce": 1200,
"rightLandingForce": 1200
},
"output": {
"propulsionAsymmetryPercent": 10.526315789473683,
"landingAsymmetryPercent": 0
}
}Limitations and assumptions
No side-dominance label, force-trace alignment or performance threshold is supplied.
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 Limb Symmetry Index: Calculate limb symmetry index from the supplied measurements. For a complementary task, use Antalgic Stance Asymmetry: Quantify left/right gait stance-time asymmetry relative to their mean.
References
-
Jump Phase Asymmetry — tool.io
Similar or alternative tools
- Limb Symmetry Index
Calculate limb symmetry index from the supplied measurements.
- Antalgic Stance Asymmetry
Quantify left/right gait stance-time asymmetry relative to their mean.