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This study compared strategies to define final and initial speeds for designing ramp protocols.  V   O 2 max   was directly assessed in 117 subjects (29 ± 8 yrs) and estimated by three nonexercise models: (1) Veterans Specific Activity Questionnaire (VSAQ); (2) Rating of Perceived Capacity (RPC); (3) Questionnaire of Cardiorespiratory Fitness (CRF). Thirty seven subjects (30 ± 9 yrs) performed three additional tests with initial speeds corresponding to 50% of estimated  V   O 2 max   and 50% and 60% of measured  V   O 2 max  . Significant differences ( P  < 0.001) were found between  V   O 2 max   measured (41.5 ± 6.6 mL · kg −1   · min −1 ) and estimated by VSAQ (36.6 ± 6.6 mL · kg −1   · min −1 ) and CRF (45.0 ± 5.3 mL · kg −1   · min −1 ), but not RPC (41.3 ± 6.2 mL · kg −1   · min −1 ). The CRF had the highest ICC, the lowest SEE, and better limits of agreement with  V   O 2 max   compared to the other instruments. Initial speeds from 50%–60%  V   O 2 max   estimated by CRF or measured produced similar  V   O 2 max   (40.7 ± 5.9; 40.0 ± 5.6; 40.3 ± 5.5 mL · kg −1   · min −1  resp.,  P  = 0.14). The closest relationship to identity line was found in tests beginning at 50%  V   O 2 max   estimated by CRF. In conclusion, CRF was the best option to estimate  V   O 2 max   and therefore to define the final speed for ramp protocols. The measured  V   O 2 max   was independent of initial speeds, but speeds higher than 50%  V   O 2 max   produced poorer submaximal relationships between workload and  V   O 2  .

Determination of Best Criteria to Determine Final and Initial Speeds within Ramp Exercise Testing Protocols