MoStrain

"The Load Monitor" — "I measure your body's stress"

Status: ❌ Future

MoStrain will track daily strain and recovery scores from wearable devices.

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Purpose

• Import strain scores from wearables
• Track daily recovery readiness
• Correlate strain with training load
• Provide objective fatigue data

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Supported Devices (Planned)

Device	Metrics Available
WHOOP	Strain score, recovery %, HRV
Apple Watch	Activity, HRV, cardio fitness
Garmin	Body Battery, stress, HRV
Oura	Readiness score, HRV, sleep stages
Fitbit	Daily readiness, stress score

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Data Model

interface StrainData {
  id: string;
  userId: string;
  date: Date;

  // Strain (activity load)
  strainScore: number;        // 0-21 (WHOOP scale)
  activityCalories: number;
  activeMinutes: number;

  // Recovery
  recoveryScore: number;      // 0-100%
  hrvMs: number;              // Heart rate variability
  restingHr: number;          // Resting heart rate

  // Source
  source: WearableSource;
  externalId: string;

  syncedAt: Date;
}

interface HRVTrend {
  current: number;
  baseline: number;           // 7-day average
  percentOfBaseline: number;
  trend: 'above' | 'at' | 'below';
}

type WearableSource =
  | 'whoop'
  | 'apple_watch'
  | 'garmin'
  | 'oura'
  | 'fitbit';

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Strain Scoring

WHOOP-style Scale (0-21)

Score	Level	Description
0-9	Light	Easy day, good recovery
10-13	Moderate	Typical training day
14-17	High	Hard workout
18-21	Very High	Extreme exertion

Recovery Score (0-100%)

Score	Level	Training Recommendation
0-33%	Poor	Rest or light activity
34-66%	Moderate	Normal training
67-100%	Good	Train hard, PR attempts

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HRV Analysis

Heart Rate Variability is a key recovery indicator:

function analyzeHRV(current: number, baseline: number): HRVAnalysis {
  const percentOfBaseline = (current / baseline) * 100;

  if (percentOfBaseline < 85) {
    return {
      status: 'suppressed',
      recommendation: 'Consider reducing training load'
    };
  }
  if (percentOfBaseline > 115) {
    return {
      status: 'elevated',
      recommendation: 'Well recovered, train hard'
    };
  }
  return {
    status: 'normal',
    recommendation: 'Train as planned'
  };
}

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Planned API Endpoints

Endpoint	Method	Description
/api/strain	GET	Get strain/recovery data
/api/strain/sync	POST	Sync from wearable
/api/strain/trend	GET	Get HRV/recovery trend

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Integration Points

Will Receive from:

• MoWearables (device sync)

Will Provide to:

• MoFatigue (objective fatigue data)
• Dashboard (strain/recovery display)
• MoSuggest (training adjustments)

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Implementation Tasks

• Design strain_data table
• Integrate with wearable APIs
• Build HRV analysis
• Create strain dashboard widget
• Add strain to fatigue calculation
• Build sync settings UI