pacing analysis derived

{
  "input": {
    "body": {
      "windowDays": 14,
      "observations": [
        {
          "metric": "hrv-rmssd",
          "measuredAt": "2026-08-30T07:00:00Z",
          "recordType": "nutrition-biometric-observation",
          "measurement": {
            "unit": "ms",
            "value": "42.1",
            "precision": "1"
          },
          "missingness": {
            "status": "observed"
          },
          "schemaVersion": "1.0.0"
        }
      ]
    },
    "type": "http",
    "method": "POST",
    "bodyType": "json"
  },
  "output": {
    "type": "json",
    "example": {
      "hrv": {
        "today": {
          "value": 31.2,
          "status": "observed",
          "timestamp": "2026-08-30T07:00:00Z"
        },
        "baseline": {
          "n": 13,
          "mad": 3.4,
          "median": 42.1,
          "windowDays": 14,
          "missingCount": 1,
          "insufficientData": false
        },
        "deviation": {
          "mad": 3.4,
          "median": 42.1,
          "status": "ok",
          "rawDelta": -10.9,
          "deviation": -4.3
        }
      },
      "note": "Descriptive statistics and labeled heuristic flags only. No diagnosis, prediction, or confirmation of post-exertional malaise is made or implied.",
      "risk": {
        "note": "Descriptive deviation-from-own-baseline flags only. No output of this function diagnoses, predicts, or confirms post-exertional malaise.",
        "flags": [
          {
            "code": "HRV_SUPPRESSED_VS_OWN_BASELINE",
            "message": "Today's HRV (RMSSD) deviates notably below this person's own rolling baseline.",
            "evidenceStatus": "Directionally consistent with Aboagye et al. 2025 (single post-COVID cohort, n=68, not externally validated) and Ruijgt et al. 2026 (observational, no validated threshold). Not a diagnostic or predictive claim."
          }
        ],
        "dataQuality": {
          "hrv": "ok",
          "sleep": "insufficient-baseline",
          "activity": "insufficient-baseline"
        }
      },
      "sleep": {
        "today": null,
        "baseline": {
          "n": 0,
          "mad": null,
          "median": null,
          "windowDays": 14,
          "missingCount": 0,
          "insufficientData": true
        },
        "deviation": {
          "mad": null,
          "median": null,
          "status": "insufficient-baseline",
          "rawDelta": null,
          "deviation": null
        }
      },
      "activity": {
        "today": null,
        "baseline": {
          "n": 0,
          "mad": null,
          "median": null,
          "windowDays": 14,
          "missingCount": 0,
          "insufficientData": true
        },
        "deviation": {
          "mad": null,
          "median": null,
          "status": "insufficient-baseline",
          "rawDelta": null,
          "deviation": null
        }
      },
      "windowDays": 14,
      "observationCount": 15,
      "restingHeartRate": {
        "latestValue": 58,
        "thresholdEstimate": {
          "formula": "resting heart rate + 15 bpm",
          "restingHr": 58,
          "ceilingBpm": 73,
          "evidenceStatus": "Workwell Foundation clinical rule of thumb; no validating primary study found (targeted PubMed search, 2026-09-01). Present as an informal heuristic, never as a validated instrument."
        }
      },
      "usableObservationCount": 15
    }
  }
}