Why are cycling LTHR zones lower than running zones?

Cycling is non-weight-bearing and involves less upper-body muscular recruitment, resulting in lower cardiac output and a 5 to 8 BPM lower threshold for identical fitness levels.

Updated: August 2026 • Verified v1.2

Lactate Threshold Heart Rate (LTHR) & Training Zones Calculator

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LTHR = Avg HR of final 20 mins of 30-min TT; Zones = LTHR * [0.85, 0.90, 0.95, 1.00, 1.02, 1.06]

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Understanding Your Results

Calculates exact BPM ranges for Zone 1 (Recovery) through Zone 5c (Anaerobic Power) with Perceived Exertion (RPE) ratings and physiological training adaptations.

Practical Guidance & Next Steps

Perform a 30-minute solo all-out time trial after warming up. Press lap at minute 10; the average heart rate of the final 20 minutes is your LTHR.

What is this?

A sports physiology calculator that computes customized aerobic and anaerobic training zones based on Lactate Threshold Heart Rate (LTHR).

How does it work?

1. Select sport (running or cycling) and test protocol. 2. Enter average heart rate from the final 20 minutes of a 30-minute solo time trial. 3. Review exact BPM target ranges for Zone 1 (Recovery) through Zone 5c (Anaerobic Power).

Why use it?

Provides scientifically anchored heart rate zones reflecting actual metabolic inflection points rather than generic age-based formulas.

Technical Scope & Calculation Limitations

Based on Joe Friel's validated endurance sport methodology. Cycling LTHR is typically 5-8 BPM lower than running LTHR due to non-weight-bearing mechanics.

Frequently Asked Questions

Max HR varies widely between individuals of the same age and does not reflect fitness improvements. LTHR directly tracks the metabolic threshold where lactate begins accumulating.

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