majiayu000/claude-arsenal
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xiaohongshu
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Biomechanics Validation
biomechanics-validation
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.
SKILL.md
Full skill instructions
Biomechanics Validation
When reviewing jump metrics, validate against these norms:
RSI (Reactive Strength Index)
| Population | RSI Range |
|---|---|
| Recreational | 0.5-1.5 |
| Trained | 1.5-2.5 |
| Elite | 2.5-3.5 |
Flag values > 3.5 as potentially erroneous (measurement or technique issue).
CMJ Jump Height
| Population | Male (cm) | Female (cm) |
|---|---|---|
| Recreational | 25-40 | 20-35 |
| Trained | 40-55 | 35-45 |
| Elite | 55-70+ | 45-55+ |
Ground Contact Time (Drop Jump)
| Range | Interpretation |
|---|---|
| < 100 ms | Likely sensor/detection error |
| 150-250 ms | Optimal reactive strength |
| 250-350 ms | Acceptable, technique improvement possible |
| > 400 ms | Technique issue or fatigue |
Flight Time
| Jump Type | Typical Range | Flag If |
|---|---|---|
| CMJ | 400-600 ms | > 800 ms |
| Drop Jump | 350-550 ms | > 700 ms |
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)
| Depth | Interpretation |
|---|---|
| < 20 cm | Shallow - may limit power generation |
| 20-40 cm | Optimal range |
| > 50 cm | Deep - may indicate technique issue |
Validation Response Format
When validating metrics, provide:
- Status: Normal / Warning / Error
- Value: The actual metric value
- Expected Range: Population-appropriate range
- Interpretation: Coaching-friendly explanation
- Recommendation: If outside norms, suggest next steps
Example Validation
RSI: 2.8
Status: Normal (Elite range)
Expected: 2.5-3.5 for elite athletes
Interpretation: Excellent reactive strength capability
Ground 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
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