The Complete Guide to Cycling Interval Training: Designing VO2max, Lactate Threshold, and Anaerobic Zones

Introduction

“I ride every week, so why isn’t my speed improving?” This is a common lament among amateur cyclists after six months to a year of riding. The problem usually isn’t riding too little, but rather an incorrect distribution of training intensity—staying forever in the gray zone of “a bit breathless but still manageable,” which neither builds an aerobic base nor triggers adaptations from intensity stimuli.

Interval training is precisely the solution. But interval training isn’t synonymous with “it has to be exhausting and painful”—it’s a tool that precisely targets specific physiological systems. This article will walk you through the three main types of interval training and how to properly integrate them into your weekly plan.

Understanding the Energy Systems in Cycling

The human body uses three energy systems during exercise, with each system contributing differently depending on intensity:

The essence of training is applying sufficient stress to these energy systems so the body adapts and improves its capacity.

The Three Main Types of Interval Training

1. VO2max Intervals: Maximal Oxygen Uptake Training

Goal: Improve the cardiorespiratory system’s maximal oxygen uptake.

Intensity: Power at approximately 106–120% of FTP, or heart rate at 90–95% of max heart rate.

Characteristics: Very breathless, unable to speak, but the intensity can be sustained for 3–8 minutes.

Typical Workout:

• 4–6 × 4 minutes, with 4 minutes of recovery between intervals (work:recovery = 1:1)
• Or: 4 × 3 minutes, with 3 minutes of recovery

Training Effects:

• Increases cardiac output (more blood pumped per heartbeat)
• Enhances the muscles’ ability to utilize oxygen
• Raises the ceiling of overall aerobic capacity

Application in Taiwan: Find a 3–5% gentle slope long enough to ride for over 4 minutes; or use an indoor trainer to precisely control power.

Frequency Recommendation: At most 2 sessions per week, and do not continue for more than 4 consecutive weeks (neuromuscular and muscular recovery requires more time).

2. Lactate Threshold Training: Raising Threshold Power

Goal: Increase lactate threshold power, allowing the body to clear lactate at higher intensities.

Intensity: Power at approximately 95–105% of FTP, feeling “very breathless, just able to utter a word or two.”

Typical Workout:

• 2 × 20 minutes at threshold (5 minutes recovery between sets)
• Or: 3 × 10 minutes (3 minutes recovery between sets)
• Or: 4 × 8 minutes (suitable for those new to threshold training)

Training Effects:

• Directly raises FTP (the most important endurance metric)
• Improves the muscles’ rate of lactate clearance
• Sustains higher power output during races or climbs

Key Execution Point: The difficulty of threshold training lies in “pacing”—not too easy (losing the stimulus effect) and not too hard (unable to finish). For your first 2 × 20 session, deliberately hold back during the first 10 minutes to confirm you can sustain the same power in the latter half.

Frequency Recommendation: 1–2 sessions per week; this is the core workout in most amateur cyclists’ weekly plans.

3. Anaerobic Sprint Training: Explosive Power and Sprinting Ability

Goal: Improve short-duration maximal power output and develop race-day sprinting ability.

Intensity: Above 130–150% of FTP, all-out sprinting.

Typical Workout:

• 8 × 30 seconds all-out sprints, with 4.5 minutes recovery between intervals (Tabata variation)
• Or: 10 × 10 seconds maximal sprints, with 50 seconds recovery
• Or: 4 × 1 minute high-intensity (near maximal output), with 3 minutes recovery

Training Effects:

• Increases the capacity of the phosphocreatine system
• Enhances the recruitment of fast-twitch muscle fibers
• Builds explosive power reserves for racing

Cautions: Anaerobic training places greater stress on joints and ligaments, so a thorough warm-up (at least 15–20 minutes) is essential. Cyclists with knee issues should proceed with caution and consult a physician or physical therapist first.

How to Structure the Three Interval Types in a Weekly Plan

Using an amateur cyclist training 8–10 hours per week as an example:

Key Principles:

• Allow at least 48 hours between high-intensity days
• Consecutive high-intensity days are a major mistake
• Schedule 1 recovery week every 4 weeks, reducing training volume by 30–40%

Practical Advice

Use RPE (Rate of Perceived Exertion): Even without a power meter, RPE remains an effective tool for gauging training intensity. VO2max intervals should feel like 8–9 (very hard), threshold training around 7 (hard), and anaerobic sprints at 10 (all-out).

Signs of Overtraining to Avoid: Declining sleep quality, resting heart rate rising by 5–7 bpm, and a complete lack of motivation during training—these are your body’s way of telling you “it’s time to rest.” Interval training has high recovery demands; pushing through will only stall or even reverse your progress.

Conclusion

Interval training isn’t about making yourself suffer—it’s about making every pedal stroke count. Understand the principles behind the three types of intervals, configure them appropriately based on your training goals, and pair them with sufficient low-intensity aerobic work and recovery, and your power numbers will start to speak for themselves.

Related Reading

• Breaking Down Interval Training: The Purpose and Workout Design Logic of VO2max Intervals, Lactate Threshold Intervals, and Sprint Intervals
• Improving Cycling VO2max: The Scientific Design of 4-Minute Intervals
• Improving VO2max in Road Running: The Scientific Design of Interval Runs
• Cycling High-Intensity Interval Training (HIIT): Scientific Methods for VO2max Improvement