Validation of the OMNI Rate of Perceived Exertion Color-Face Scale With Prescription Congruence and Intensity Discrimination in Laboratory and Field
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Purpose To develop and validate the OMNI RPE Color-Face Scale (CFS) on adults. Methods A total of 28 healthy participants were recruited for the study which involved scale development and validation. Scale development – participants matched facial illustrations, verbal descriptors and color blocks to a corresponding rate of perceived exertion (RPE) value on a vertical 0–10 scale, and semantic differential analysis (SDA) was carried out. In the validation segment, participants were randomly assigned to experimental group (EG) or control group (CG). During the estimation trial (ET), participants ran a discontinuous graded submaximal treadmill test with 4-minute work-rest cycle at 1% gradient until volitional exhaustion. In production trial (PT), participants ran three counterbalanced trials (RPE 2, 5 and 7) for 8-minute each, In the 3rd session, participants played a 30-minute modified soccer game. RPE and HR were recorded after each segment. Results SDA revealed verbal descriptors, colors and illustrations corresponded with increasing intensity of the OMNI CFS. Construct validity from ET indicated positive linear regression of OMNI CFS against control scale ( r = 0.88, p = 0.00). Concurrent validity from PT was obtained with strong positive correlation with control scale for VO 2 ( r = 0.80, p = 0.00) and HR ( r = 0.69, p = 0.00). Prescription congruence was attained with no significant difference between ET and PT in HR ( p = 0.49) and VO 2 ( p = 0.97). Intensity discrimination indicated significant difference in VO 2 ( p = 0.65) and HR ( p = 0.86) between each increasing RPE. Significant differences were identified between warm-up and cool-down with game time in HR (warm-up: p = 0.00, cool-down: p = 0.00) and RPE (warm-up: p = 0.00, cool-down: p = 0.00). Conclusion OMNI CFS was well established, meeting the validation criteria for self-regulation in both indoor and outdoor settings.
