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Identification of critical intensity from a single lactate measure during a 3-min, submaximal cycle-ergometer test

(2017) JOURNAL OF SPORTS SCIENCES. 35(22). p.2191-2197
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Abstract
We tested the hypothesis that critical intensity in cycling can be determined from a single delta blood lactate in the third minute of a submaximal cycle ergometer trial. Fourteen healthy young men performed four to six constant-power-output trials on a cycle ergometer to the limit of tolerance. Critical intensity was calculated via a linear model and subsequently validated. Lactate was measured at baseline and at 3 min from exercise onset. Delta lactate was the difference between these measures. Based on individual trials, we obtained the delta lactate-% validated critical intensity relationship and thereafter an estimate of critical intensity was computed. Validated and estimated critical intensity were compared by effects sizes, paired-sample t-test and Bland-Altman analysis. Delta lactate was a linear function of the intensity of exercise, expressed as % validated critical intensity (R-2 = 0.89). Estimated critical intensity was not different from (d = 0.03, P = 0.98) and highly correlated with (R-2 = 0.88) validated critical intensity. The bias between measures was 0.03 W (not equal 0) with a precision of 7 W. The results suggest that critical intensity in cycling can be accurately and precisely determined from delta lactate during a sub-maximal trial and so provides a practical and valid alternative to direct determination.
Keywords
Critical intensity, critical power, functional evaluation, exercise tolerance, lactate, CRITICAL POWER, STEADY-STATE, HEALTHY-ADULTS, WORK CAPACITY, EXERCISE, TIME, COMPENSATION, PREDICTION, EXHAUSTION, PROTOCOL

Citation

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MLA
Fontana, Federico Y., et al. “Identification of Critical Intensity from a Single Lactate Measure during a 3-Min, Submaximal Cycle-Ergometer Test.” JOURNAL OF SPORTS SCIENCES, vol. 35, no. 22, 2017, pp. 2191–97, doi:10.1080/02640414.2016.1261177.
APA
Fontana, F. Y., Colosio, A., Keir, D. A., Murias, J. M., & Pogliaghi, S. (2017). Identification of critical intensity from a single lactate measure during a 3-min, submaximal cycle-ergometer test. JOURNAL OF SPORTS SCIENCES, 35(22), 2191–2197. https://doi.org/10.1080/02640414.2016.1261177
Chicago author-date
Fontana, Federico Y., Alessandro Colosio, Daniel A. Keir, Juan M. Murias, and Silvia Pogliaghi. 2017. “Identification of Critical Intensity from a Single Lactate Measure during a 3-Min, Submaximal Cycle-Ergometer Test.” JOURNAL OF SPORTS SCIENCES 35 (22): 2191–97. https://doi.org/10.1080/02640414.2016.1261177.
Chicago author-date (all authors)
Fontana, Federico Y., Alessandro Colosio, Daniel A. Keir, Juan M. Murias, and Silvia Pogliaghi. 2017. “Identification of Critical Intensity from a Single Lactate Measure during a 3-Min, Submaximal Cycle-Ergometer Test.” JOURNAL OF SPORTS SCIENCES 35 (22): 2191–2197. doi:10.1080/02640414.2016.1261177.
Vancouver
1.
Fontana FY, Colosio A, Keir DA, Murias JM, Pogliaghi S. Identification of critical intensity from a single lactate measure during a 3-min, submaximal cycle-ergometer test. JOURNAL OF SPORTS SCIENCES. 2017;35(22):2191–7.
IEEE
[1]
F. Y. Fontana, A. Colosio, D. A. Keir, J. M. Murias, and S. Pogliaghi, “Identification of critical intensity from a single lactate measure during a 3-min, submaximal cycle-ergometer test,” JOURNAL OF SPORTS SCIENCES, vol. 35, no. 22, pp. 2191–2197, 2017.
@article{8693531,
  abstract     = {We tested the hypothesis that critical intensity in cycling can be determined from a single delta blood lactate in the third minute of a submaximal cycle ergometer trial. Fourteen healthy young men performed four to six constant-power-output trials on a cycle ergometer to the limit of tolerance. Critical intensity was calculated via a linear model and subsequently validated. Lactate was measured at baseline and at 3 min from exercise onset. Delta lactate was the difference between these measures. Based on individual trials, we obtained the delta lactate-% validated critical intensity relationship and thereafter an estimate of critical intensity was computed. Validated and estimated critical intensity were compared by effects sizes, paired-sample t-test and Bland-Altman analysis. Delta lactate was a linear function of the intensity of exercise, expressed as % validated critical intensity (R-2 = 0.89). Estimated critical intensity was not different from (d = 0.03, P = 0.98) and highly correlated with (R-2 = 0.88) validated critical intensity. The bias between measures was 0.03 W (not equal 0) with a precision of 7 W. The results suggest that critical intensity in cycling can be accurately and precisely determined from delta lactate during a sub-maximal trial and so provides a practical and valid alternative to direct determination.},
  author       = {Fontana, Federico Y. and Colosio, Alessandro and Keir, Daniel A. and Murias, Juan M. and Pogliaghi, Silvia},
  issn         = {0264-0414},
  journal      = {JOURNAL OF SPORTS SCIENCES},
  keywords     = {Critical intensity,critical power,functional evaluation,exercise tolerance,lactate,CRITICAL POWER,STEADY-STATE,HEALTHY-ADULTS,WORK CAPACITY,EXERCISE,TIME,COMPENSATION,PREDICTION,EXHAUSTION,PROTOCOL},
  language     = {eng},
  number       = {22},
  pages        = {2191--2197},
  title        = {Identification of critical intensity from a single lactate measure during a 3-min, submaximal cycle-ergometer test},
  url          = {http://dx.doi.org/10.1080/02640414.2016.1261177},
  volume       = {35},
  year         = {2017},
}

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