Question

how can you determine your threshold of training and your target heart rate zone for building cardiorespiratory endurance? two methods

Answer 1

Two simple, reliable ways to find your training threshold and target heart‑rate zone for improving cardiorespiratory endurance:

Method 1 — Percent of maximum heart rate (HRmax)
- Find HRmax: common estimate = 220 − age (or slightly more accurate: 208 − 0.7×age). For best accuracy, use a supervised maximal test.
- Decide intensity for your goal:
- General endurance (moderate) ≈ 60–75% HRmax
- Tempo/threshold (to raise your lactate/anaerobic threshold) ≈ ~80–90% HRmax
- Calculate target HR: target = HRmax × desired %.
- Example (age 35): HRmax ≈ 220−35 = 185 bpm. Moderate zone = 0.60–0.75×185 = 111–139 bpm. Threshold/tempo ≈ 0.80–0.90×185 = 148–167 bpm.

Method 2 — Heart Rate Reserve (Karvonen) — more individualized
- Measure resting HR (HRrest) first thing in the morning or after several minutes sitting.
- Calculate HRR = HRmax − HRrest (use same HRmax estimate or test value).
- Target HR = HRrest + (intensity% × HRR).
- Intensity guidelines:
- Moderate endurance ≈ 40–60% HRR
- Vigorous / tempo/threshold ≈ 60–85% HRR (threshold training often near the upper end of this)
- Example (age 35, HRrest 60 bpm, HRmax 185): HRR = 125. Moderate = 60% HRR => 60 + 0.60×125 = 135 bpm. Threshold ≈ 75% HRR => 60 + 0.75×125 = 154 bpm.

Notes on training threshold (lactate/ventilatory threshold)
- The “threshold” intensity is the effort you can sustain for ~30–60 minutes and is a powerful stimulus for increasing endurance. It usually corresponds to ~80–90% HRmax or ~60–85% HRR for many athletes, but varies by fitness.
- You can estimate it directly with a lab lactate/VO2 test or with a field test: a hard, steady 20–30 minute time trial and take the average HR of the last 20 minutes — that approximates your threshold HR.

Safety and accuracy
- Age formulas are approximate; the Karvonen method is generally more accurate because it uses your resting HR.
- For precise thresholds, consider lab testing or a supervised maximal test.
- If you have heart disease, are on medications that affect HR (beta‑blockers), or have medical concerns, consult a clinician before doing max tests or using HR zones.

If you want, tell me your age and resting HR and I’ll calculate both methods and show your specific target ranges.