Objective: To test the hypothesis that it is possible to estimate the glycemic threshold (GT) of inspiratory muscles using the subjective perception scale to Borg's effort. Methods: Observational association and cross-sectional study, in which 21 male individuals, eutrophic, irregularly active, aged between 18 and 30 years evaluated. All submitted to an incremental inspiratory muscle test to determine the GT. During the test, the traditional Borg scale was applied at each stage of the test.

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... son's test was used to verify the correlation between GT and Borg. Results: A descriptive analysis that GT occurred 23±9.1% of MIP in an absolute load of 32±14.6cmH2O and was compatible with the score of 13±1.5 on the BORG scale (r=0.67) and (r=0.58) respectively. Conclusions: Our results provide evidence that the Borg scale is a viable method to determine the GT of inspiratory muscles and consequently be used for prescribing Inspiratory Muscle Training.