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name: biomechanics-validation description: Validates jump metrics against physiological norms. Use when analyzing CMJ or drop jump results, discussing RSI values, jump heights, ground contact times, or when metrics seem unusual.

Biomechanics Validation

When reviewing jump metrics, validate against these norms:

RSI (Reactive Strength Index)

Flag values > 3.5 as potentially erroneous (measurement or technique issue).

CMJ Jump Height

Ground Contact Time (Drop Jump)

Flight Time

Triple Extension (CMJ)

All three joints should approach full extension at takeoff:

• Hip: > 160° (optimal: 170-180°)
• Knee: > 160° (optimal: 170-180°)
• Ankle: > 130° (plantar flexion)

Countermovement Depth (CMJ)

Validation Response Format

When validating metrics, provide:

1. Status: Normal / Warning / Error
2. Value: The actual metric value
3. Expected Range: Population-appropriate range
4. Interpretation: Coaching-friendly explanation
5. Recommendation: If outside norms, suggest next steps

Example Validation

CopyRSI: 2.8
Status: Normal (Elite range)
Expected: 2.5-3.5 for elite athletes
Interpretation: Excellent reactive strength capability

CopyGround Contact Time: 85 ms
Status: Warning
Expected: 150-250 ms optimal
Interpretation: Unusually short - likely detection error
Recommendation: Review debug video for takeoff/landing detection accuracy