YMCA Submaximal Cycle Ergometer Test
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A graded, multi-stage bike test that nudges the rider toward 85% of max HR across 2–4 workloads, then extrapolates the HR–workload line to estimate VO2max — no max effort needed.
Detail
The YMCA submaximal cycle ergometer test estimates VO2max from the heart-rate response to progressive 3-minute stages on a mechanically braked cycle ergometer at a fixed cadence (50 rpm).
Protocol:
- Stage 1 (warm-up workload): 150 kgm·min⁻¹ (0.5 kp / 25 W).
- The HR at the end of stage 1 (averaged from minutes 2 and 3, steady state) determines the next workload via the YMCA branching table:
- HR <80 → next stages 750, 900, 1050 kgm·min⁻¹
- HR 80–89 → 600, 750, 900
- HR 90–100 → 450, 600, 750
- HR >100 → 300, 450, 600
- Continue until two consecutive steady-state HRs between 110 bpm and 85% of age-predicted HRmax are obtained, then stop.
- Plot HR vs. workload for those steady-state points, draw the line to age-predicted HRmax (e.g., 220 − age), and read the predicted maximal workload; convert to predicted VO2max.
Assumptions/limitations: steady-state HR at each stage; a linear HR–workload relationship; a standard mechanical efficiency; and an assumed HRmax (the largest error source — see Estimating Maximal Heart Rate). Caffeine, medications (beta-blockers), heat, and anxiety distort HR and thus the estimate. Stop per standard termination criteria or at the 85%-HRmax endpoint.
Key facts
- 50 rpm; 3-minute stages; workloads set by the HR at the end of stage 1 (branching table).
- Stage 1 = 150 kgm·min⁻¹ (25 W).
- Endpoint: two steady-state HRs between 110 bpm and 85% of age-predicted HRmax.
- Extrapolate HR-vs-workload line to predicted HRmax → predicted max workload → VO2max.
- Main error source: the assumed HRmax; beta-blockers/caffeine invalidate it.
Connections
- Åstrand-Ryhming Cycle Ergometer Test — the single-stage nomogram alternative.
- Estimating Maximal Heart Rate — supplies the HRmax the test extrapolates to.
- Reasons to Stop an Exercise Test — when to stop early.
- Cycling (Cardio Modality) — the training modality counterpart.
Sources
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Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.