Lab 4 Astrand-Rhyming Submaximal Cycle Ergometer Test (Modified) to Estimate VO2 max

Estimating VO2 max A means of describing the cardiorespiratory endurance fitness level of an individual The relationship of power output to VO2 remains fairly constant By knowing power output, the corresponding VO2 can be predicted with reasonable accuracy The proportion to which HR increases in comparison to power output or VO2 will vary between individuals based on fitness level

Ability to Predict VO2 max Based on the fact that the heart pumps more efficiently and oxygen is used more readily for metabolism in individuals with higher VO2 max capabilities. If two individuals are performing at the same power output (requiring the same rate of oxygen consumption), the individual with the higher VO2 max will tend to have a lower HR.

Astrand-Rhyming Test Example Example: If a 20 year old, 154-pound male had an average HR of 150 bpm during the last two minutes of a 900 kgm ∙ min-1 power output (3 kg resistance at 50 rpm) his values would be: 1. preliminary VO2 max value from Table 4.1 = 3.2 L ∙ min-1 2. 3.2 x 1.07 (age correction factor, Table 4.3) = 3.425 L ∙ min-1 3. VO2max = (3425 mL ∙ min-1) / 70 kg = 48.9 mL ∙ kg-1 ∙ min-1 (Body weight = 70 kg) 4. Fitness category (Table 4.4) = excellent