Breathing Cycles

thought for the day: would i save much energy going from a 4 count breathing cycle to 8 count during a half ironman bike and run

• No, you will not save energy—and forcing an 8-count breathing cycle (inhale and exhale spanning 8 pedal strokes or footstrikes) during a Half Ironman (70.3) race intensity will likely hurt your performance. 
• Trying to artificially lengthen your breath past your body's natural metabolic demand causes carbon dioxide to build up, spikes air hunger, and triggers premature fatigue.

Why an 8-Count Cycle Fails at Race Pace

• Ventilatory Threshold: A Half Ironman bike leg (ridden at roughly 75–80% of FTP) and the ensuing half-marathon require significant oxygen turnover.
• Air Starvation: Forcing an 8-count pattern restricts the volume of air you need to clear CO₂, causing a stress response in your nervous system.
• Forced vs. Natural: Elite endurance athletes naturally settle into quicker, rhythmic patterns (like a 2-to-4 count per inhale/exhale) when working under load, only using deep slow counts during low-intensity recovery

Practical Rhythms for Racing

• On the Bike: Use a comfortable 4-count (2 pedal strokes inhaling, 2 exhaling) or 6-count (3 strokes in, 3 out) depending on terrain and grade.
• On the Run: Most efficient runners naturally sync to a 2:2 or 3:2 step-to-breath ratio at half-iron pace.
• The Rule of Thumb: Let your breathing rate be dictated by your effort. If you cannot maintain a rhythm, you are likely pacing too hard.

follow up thought: on the swim, might might bi-lateral breathing help?

• Yes, bi-lateral breathing will absolutely help, especially during an open-water swim like a half-ironman.
• While it may not directly save energy in terms of lung capacity, it provides massive strategic, structural, and physiological advantages that conserve energy over a 1.2-mile swim. Breathing every three strokes (alternating sides) keeps your body balanced and helps you navigate changing outdoor conditions.

Strategic and Physical Benefits of Bi-Lateral Breathing

• Straighter Sighting: Breathing only on one side creates an asymmetrical stroke, which causes most swimmers to veer off course. Bi-lateral breathing keeps your pull balanced, ensuring you swim in a straight line and don't waste energy swimming extra yards.
• Injury Prevention: Unilateral (one-sided) breathing overloads the shoulder, neck, and lower back muscles on your dominant side. Alternating sides distributes the muscular workload evenly, reducing the risk of premature shoulder fatigue or cramping.
• Navigating Chop and Swell: If wind, waves, or glare from the sun are coming from your dominant breathing side, you will swallow water and disrupt your rhythm. Being able to switch to the protected side is a critical open-water survival skill.
• Drafting Flexibility: To save up to 20% of your energy, you want to draft closely behind or to the side of another swimmer. Bi-lateral breathing allows you to keep an eye on your target swimmer, regardless of which side they are on.

The Downside to Consider For a 70.3

While bi-lateral breathing is ideal, it does have one drawback for a half-ironman distance: it reduces your oxygen intake by 33% compared to breathing every two strokes.

If you switch from a 2-stroke rhythm to a strict 3-stroke bi-lateral rhythm, you might feel a buildup of carbon dioxide (breathlessness) as your heart rate rises.
How to Apply It to Your Race Strategy

You do not need to stick to a rigid 3-stroke count the entire time. Instead, use these flexible patterns to get the benefits of bi-lateral breathing without starving your muscles of oxygen:

• The "Switch Sides by Buoy" Strategy: Breathe every 2 strokes on your right side for one stretch of the course, then switch to breathing every 2 strokes on your left side after turning a buoy or every few minutes. This keeps your muscles balanced but maintains high oxygen intake.
• The 2-3-2 Pattern: Breathe twice to the right, take three strokes, and then breathe twice to the left. This hybrid pattern allows you to look at both sides of the field while keeping your air supply high.
• Warm-Up Bi-Laterally: Use a strict 3-stroke bi-lateral breath during your warm-up and the calm, steady middle sections of the swim to keep your stroke symmetrical. Switch to a 2-stroke rhythm if you need to push hard through crowd congestion or currents.