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

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. Cri...

Full description

Saved in:
Bibliographic Details
Published in:Journal of sports sciences 2017-11, Vol.35 (22), p.2191-2197
Main Authors: Fontana, Federico Y., Colosio, Alessandro L., Keir, Daniel A., Murias, Juan M., Pogliaghi, Silvia
Format: Article
Language:English
Subjects:
Adult
Anaerobic Threshold
Bicycling - physiology
Critical intensity
critical power
Ergometry
Exercise intensity
Exercise Test
exercise tolerance
functional evaluation
Humans
lactate
Lactic acid
Lactic Acid - blood
Linear Models
Male
Sports medicine
Young Adult
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 (≠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.
ISSN:0264-0414
1466-447X
DOI:10.1080/02640414.2016.1261177