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Maximal Lactate Steady State Versus the 20-Minute Functional Threshold Power Test in Well-Trained Individuals: “Watts” the Big Deal?

Inglis, Erin Calaine, Iannetta, Danilo, Passfield, Louis, Murias, Juan M. (2020) Maximal Lactate Steady State Versus the 20-Minute Functional Threshold Power Test in Well-Trained Individuals: “Watts” the Big Deal? International Journal of Sports Physiology and Performance, 15 (4). pp. 541-547. ISSN 1555-0265. E-ISSN 1555-0273. (doi:10.1123/ijspp.2019-0214) (KAR id:78757)

Abstract

Purpose: This study aimed to i) compare the power output (PO) for both the 20-minute functional threshold power (FTP20) field-test and the calculated 95% (FTP95%) with power at maximal lactate steady state (MLSS); and ii) evaluate the sensitivity of FTP95% and MLSS to training induced changes. Methods: Eighteen participants (12 males- 37± 6 years; 6 females- 28 ± 6 years) performed a ramp-incremental cycling test to exhaustion, 2 to 3 constant load MLSS trials, and a FTP20 test. 10 participants returned to repeat the test series after 7-months of training. Results: PO at FTP20 and FTP95% was greater than that at MLSS (p=0.00), with the PO at MLSS representing 88.5 ± 4.8% and 93.1 ± 5.1% of FTP and FTP95%, respectively. MLSS was greater POST compared to PRE training (12 ± 8 W) (p=0.002). No increase was seen in mean PO at FTP20 and FTP95% (p=0.75). Conclusion: The results indicate that the PO at FTP95% is different to MLSS, and that changes in MLSS PO after training were not reflected by FTP95%. Even using an adjusted percentage (i.e., 88% rather than 95% of FTP20), the large variability in the data is such that it would not be advisable to use this as a representation of MLSS.

Item Type: Article
DOI/Identification number: 10.1123/ijspp.2019-0214
Uncontrolled keywords: exercise testing; functional threshold power; cycling; performance; maximal lactate steady state
Divisions: Divisions > Division of Natural Sciences > Sport and Exercise Sciences
Depositing User: Louis Passfield
Date Deposited: 15 Nov 2019 12:44 UTC
Last Modified: 16 Feb 2021 14:09 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/78757 (The current URI for this page, for reference purposes)

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