Environment × Load
Minutes, high-speed efforts, surface, climate, and outcome. A load index with the environment sitting next to it — not a ranking of fields.
Inputs
Sprints, cuttings, jumps, or pitch-equivalent bursts.
Tackles, boxes, walls, slides, shots on goal against the body.
Surface
Condition
Footwear
Outcome
Result
31
Moderate
Environment recorded. Causation not implied.
- Raw load
- 68.3
- Surface factor
- 1.00
- Condition factor
- 1.00
- Combined
- 1.00
(75×0.35 + 18×1.8 + 4×2.4) × 1.00 × 1.00 / 2.2 = 31
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Methodology
Load is a transparent session score. Surface and climate are multipliers with small, published-order-of-magnitude bumps so users can see the lever move. Footwear is logged, not scored, because the evidence does not support a clean numeric penalty across sports.
raw = min×0.35 + efforts×1.8 + contacts×2.4 index = clamp(raw × surface × condition / 2.2, 0, 100) surface: grass 1.00 · turf 1.08 · hardwood 1.06 · clay 1.04 · ice 1.10 · trail 1.05 condition: dry 1.00 · wet 1.12 · hot 1.10 · cold 1.06 · indoor 1.00
Limits This cannot prove a field, court, or stadium causes injuries. Surfaces are not randomly assigned. Minutes are not equal across sports. N is one session. Use it to keep a ledger, not to publish a most-dangerous-venue list. Pair with Travel Fatigue and Sleep Tax when the week is the load.