zone-finder

Calculate heart rate training zones from workout files using the Lactate Threshold Heart Rate (LTHR) method.

Installation

go install github.com/landongrindheim/zone-finder@latest

Or build from source:

git clone https://github.com/landongrindheim/zone-finder.git
cd zone-finder
go build -o zone-finder ./cmd

Usage

zone-finder

Supported formats: TCX, FIT

Example:

$ zone-finder ~/workouts/morning-run.tcx
LTHR: 172 bpm
Zone 1: 0-137
Zone 2: 138-151
Zone 3: 152-161
Zone 4: 162-172
Zone 5: 173+

How It Works

zone-finder analyzes the last 20 minutes of your workout to determine your Lactate Threshold Heart Rate (LTHR), then calculates 5 training zones based on percentages of LTHR:

• Zone 1 (Recovery): < 80% of LTHR
• Zone 2 (Endurance): 80-88% of LTHR
• Zone 3 (Tempo): 89-94% of LTHR
• Zone 4 (Threshold): 95-100% of LTHR
• Zone 5 (VO2 Max): > LTHR

Based on the method described by David Roche.

Requirements

• Workout file must be at least 20 minutes long (ideally 30 or more)
• Heart rate data required
  • For best results, use a chest-strap or arm band heart rate monitor
• TCX or FIT format

Development

# Run tests
go test ./...

# Run with coverage
go test -cover ./...

# Build
go build -o zone-finder ./cmd

License

MIT License - see LICENSE for details