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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.

personAuthor: jakexiaohubgithub
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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:

  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

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