Key result
Borg CR-10 cutoff of 4.5 accurately predicts the onset of blood lactate accumulation.
Why the study?
The predictive value of Borg’s category ratio-scale (CR-10) for the onset of blood lactate accumulation (OBLA) in young adults was not established.
Does Borg's category ratio-scale (CR-10) accurately predict the onset of blood lactate accumulation during exercise in young adults?
Cross-Sectional (n=91)
Does Borg's category ratio-scale (CR-10) accurately predict the onset of blood lactate accumulation during exercise in young adults?
Borg's CR-10 scale is a practical and reliable tool for predicting the onset of blood lactate accumulation during exercise, performing comparably to heart rate monitoring.
CR-10 (4.5) and HR (86 bpm) may aid OBLA estimation in young adults; leaves open prospective validation before clinical use.
Aim: To evaluate the predictive value of Borg’s category ratio-scale (CR-10; 1-10) toward the onset of blood lactate accumulation (OBLA). Methods: 91 young Mexicans performed three non-consecutive sub-maximal exercise tests. Heart rate (HR), blood lactate and oxygen uptake were recorded at each CR-10 rating. Regression equations, reliable HR and CR-10 cut-off points of OBLA were then calculated. Results: HR (86 beats/min) and CR-10 (4.5) predicted OBLA with the same certainty, regardless the subject’s body mass. CR-10, HR and oxygen uptake, independently explained more than 60% of the associated variance to OBLA. Conclusions: CR-10 is useful to predict OBLA with almost the same certainty that HR, regardless the subject’s body mass.
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Ramos‐Jiménez et al. (2019) conducted a cross-sectional in Healthy (normal weight and overweight/obese) (n=91). Borg's category ratio-scale (CR-10) vs. Heart rate (% HR max) was evaluated on Prediction of the onset of blood lactate accumulation (OBLA). A Borg's category ratio-scale (CR-10) cutoff of 4.5 predicted the onset of blood lactate accumulation with a sensitivity of 0.80, specificity of 0.81, and an area under the curve of 90.2%.
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