Predicted maximal oxygen consumption (VO2MAX) values obtained during the maximal treadmill test using different protocols.

ABSTRACT

Background: VO2MAX is the sole major criterion for endurance assessment. By using the regression equation the necessity of the sophisticated gas analyzer is eliminated. The usability and applicability of such equations are questioned due to non-uniformity, standardization and other variables. Methods: 100 healthy young male subjects were recruited and each performed all the four selected treadmill protocol viz. Bruce, Modified Bruce, Ellestad and Balke. VO2MAX was calculated for each person for each protocol by using regression equation. Results: Mean and SD values of VO2MAX of each protocol were, Balke (41.94 ± 2.15), Bruce (64.55 ± 6.7), Ellestad (61.17 ± 7.5), Modified Bruce (64.36 ± 5.4). There was difference among different protocols (p<0.05), except between Bruce and Modified Bruce (p>0.05). These were compared with ACSM predicted equation based on age and height (51.5+7.4). Later Paired t-test was applied. There is no statistically significant difference between the Bruce and Modified Bruce protocols. Highest difference was observed between the Balke and Bruce protocol and between Balke and Modified Bruce, as was the difference between Balke and Ellestad protocol. Conclusion: For endurance testing Ellestad protocol can be a suitable option in resource crunch settings as the Balke protocol underestimates and Bruce overestimates the VO2MAX. Devising a ramp protocol for the population subset’s need can be the best option.