Bilateral Strength Deficit

Compare bilateral force with summed unilateral force to quantify deficit or facilitation.

Description

Bilateral strength deficit compares simultaneous bilateral force with the sum of unilateral measurements.

Bilateral strength deficit compares simultaneous bilateral force with the sum of unilateral measurements. Negative deficit denotes measured facilitation.^[1]

Compare bilateral force with summed unilateral force to quantify deficit or facilitation.

When to use Bilateral Strength Deficit

Use this tool to compare bilateral force with summed unilateral force to quantify deficit or facilitation.

Prepare the measured movement, timing, load or preassigned score requested. Keep protocols, units, paired measurements and caller-selected thresholds consistent.

How to use Bilateral Strength Deficit 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 leftUnilateralForce, rightUnilateralForce, bilateralForce using the field table and calculation rules, then run the tool.
Read unilateralSum, deficitPercent. 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
leftUnilateralForce	Left unilateral force	number	Required
rightUnilateralForce	Right unilateral force	number	Required
bilateralForce	Bilateral force	number	Required

Enter nonnegative forces with positive unilateral sum. Return that sum and signed percentage.

deficit%=100(left+right−bilateral)/(left+right)

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
unilateralSum	Unilateral sum	number
deficitPercent	Deficit percent	number

json

{
  "input": {
    "leftUnilateralForce": 100,
    "rightUnilateralForce": 100,
    "bilateralForce": 180
  },
  "output": {
    "unilateralSum": 200,
    "deficitPercent": 10
  }
}

Limitations and assumptions

No test equivalence, neural mechanism or strength recommendation 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 Cross Education Gain: Measure observed change in the untrained limb; does not establish a causal mechanism. For a complementary task, use Jump Phase Asymmetry: Calculate bilateral force asymmetry separately for propulsion and landing.

References

Bilateral Strength Deficit — tool.io

Similar or alternative tools

Cross Education Gain
Measure observed change in the untrained limb; does not establish a causal mechanism.
Jump Phase Asymmetry
Calculate bilateral force asymmetry separately for propulsion and landing.