Heart & Cardiovascular APIs¶

Welcome to the Heart & Cardiovascular suite of Health Fitness API – designed for apps, platforms, and systems that need accurate cardiovascular metrics, heart health indicators, and exercise planning tools.

Whether you are building fitness apps, clinical dashboards, personal wellness tools, or enterprise health monitoring systems, these endpoints provide reliable, real-time calculations with low-latency responses and multi-language support.

Key Features¶

Comprehensive Heart Metrics: LDL, VLDL, cholesterol ratios, triglycerides, QTc interval, Karvonen formula, target heart rate, heart rate zones, ABI.
Multi-Language Support: Responses localized in 8 languages (en, es, de, fr, pt, ja, hi, ar).
Enterprise-Grade Infrastructure: Low-latency, high-concurrency APIs for production-grade applications.
Predictive & Actionable: Supports cardiovascular risk assessment, fitness optimization, and monitoring plans.
Secure: All endpoints require API key authentication; supports admin/developer/finance roles.

Available Endpoints¶

Endpoint	Description
LDL Calculator API	Calculates LDL cholesterol from lipid profile values.
VLDL Calculator API	Calculates VLDL cholesterol using triglycerides.
Cholesterol Units Converter API	Convert between mg/dL and mmol/L for cholesterol values.
Cholesterol Ratio Calculator API	Calculates ratios for LDL, HDL, and total cholesterol.
Triglycerides Units Converter API	Convert triglycerides between mg/dL and mmol/L.
QTc Calculator API	Calculates corrected QT interval for cardiac risk assessment.
Karvonen API	Computes target heart rate using Karvonen formula.
Target Heart Rate (THR) API	Calculate training heart rate based on intensity and age.
Heart Rate Zones API	Generate heart rate zones for fitness and training programs.
ABI Calculator API	Ankle-brachial index calculation for peripheral artery disease screening.

Why Use Heart & Cardiovascular APIs?¶

Accurate & Clinically-Inspired: Follow validated formulas and reference standards for cardiovascular metrics.
Enterprise-Grade Performance: Optimized for high-volume and low-latency usage.
Multi-Language Friendly: Localized outputs for international apps.
Actionable Insights: Ideal for fitness apps, heart health monitoring, and clinical dashboards.
Secure & Scalable: Admin/developer/finance roles enable robust multi-user management.

Quick Example – Heart Rate Zones API¶

curl -X GET "https://api.hefitapi.com/api/v1/fitness/heart-rate-zones?age=33&resting_hr=58&goal=endurance&lang=en" \
  -H "X-API-Key: YOUR_API_KEY"

Response Example¶

Info

The response example below is for demonstration purposes only. Make a live request to this endpoint to receive the full, real-time, and potentially richer JSON structure.

{
  "goal": "fat_loss",
  "goal_label": "Fat Loss",
  "age": 33,
  "resting_hr_bpm": 58.0,
  "max_hr_bpm": 188,
  "max_hr_source": "provided",
  "heart_rate_reserve_bpm": 130,
  "zones": {
    "zone_1": {"label": "Zone 1", "min_bpm": 123, "max_bpm": 136},
    "zone_2": {"label": "Zone 2", "min_bpm": 136, "max_bpm": 149},
    "zone_3": {"label": "Zone 3", "min_bpm": 149, "max_bpm": 162},
    "zone_4": {"label": "Zone 4", "min_bpm": 162, "max_bpm": 175},
    "zone_5": {"label": "Zone 5", "min_bpm": 175, "max_bpm": 188}
  },
  "fat_burn_zone": {"zone": "zone_2", "label": "Fat Burn Zone", "min_bpm": 136, "max_bpm": 149},
  "vo2_optimization_zone": {"zone": "zone_4", "label": "VO2 Optimization Zone", "min_bpm": 162, "max_bpm": 175},
  "threshold_zone": {"zone": "zone_4", "min_bpm": 162, "max_bpm": 175},
  "anaerobic_power_zone": {"zone": "zone_5", "min_bpm": 175, "max_bpm": 188},
  "readiness_signal": {"level": "high", "level_label": "High", "note": "Recovery indicators support quality intervals."},
  "goal_session_guidance": ["2 threshold intervals", "1 long zone-2 block"],
  "training_notes": {
    "warmup": "Build progressively for 10-15 minutes.",
    "cooldown": "Use 8-10 minutes low-intensity recovery.",
    "zone_switching": "Transition gradually when moving between zones."
  },
  "summary": "Balanced zone strategy optimized for fat-loss efficiency.",
  "language": "en",
  "_enterprise": {
    "client": "Acme Health",
    "plan": "pro",
    "request_id": "f6b9fb31d4f2a027",
    "quota": 120,
    "usage_tracking": true
  },
  "_api_metadata_": {
    "endpoint_name": "fitness_heart_rate_zones",
    "response_language": "en"
  }
}

Next Steps¶

Dive into individual endpoints to explore parameters, requests, and responses.
Combine with Metabolism & Energy endpoints for holistic fitness and heart health insights.
Integrate with Nutrition & Body Composition APIs for personalized wellness recommendations.
Monitor API usage and roles via HefitAPI Dashboard for enterprise-grade management.

Deliver actionable heart and cardiovascular insights in real-time with Health Fitness API – accurate, scalable, and optimized for both personal apps and enterprise systems.