Comparison of NIRS exercise intensity thresholds with maximal
lactate steady state, critical power and rowing performance

Leonardo Trevisol Possamai; Fernando Klitzke Borszcz; Rafael Alves de Aguiar; Ricardo Dantas de Lucas; Tiago Turnes

doi:10.5114/biolsport.2024.129486

eISSN: 2083-1862
ISSN: 0860-021X

Biology of Sport

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2/2024
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abstract:

Original paper

Comparison of NIRS exercise intensity thresholds with maximal lactate steady state, critical power and rowing performance

Leonardo Trevisol Possamai

¹

,

Fernando Klitzke Borszcz

¹

,

Rafael Alves de Aguiar

^{1, 2}

,

Ricardo Dantas de Lucas

¹

,

Tiago Turnes

¹

Physical Effort Laboratory, Sports Center, Federal University of Santa Catarina, Florianópolis, Brazil
Human Performance Research Group, Center for Health and Sport Science, Santa Catarina State University, Florianópolis, Brazil

Biol Sport. 2024;41(2):123–130

DOI: https://doi.org/10.5114/biolsport.2024.129486

Online publish date: 2023/11/20

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This study aimed to compare the intensity of deoxygenated haemoglobin concentration ([HHb]) and tissue saturation index (TSI) breakpoints ([HHb]-BP and TSI-BP) with maximal lactate steady state (MLSS)and critical power (CP), and to describe their association with2000-m rowing ergometer performance. Fourteen male rowers performed on a rowing ergometer: I) a discontinuous incremental test with 3-min stages (INC₃); II) a continuous incremental test with 1-min stages (INC₁); III) constant workload tests to determine MLSS; and IV) performance tests of 500 m, 1000 m, 2000 m and 6000 m to determine CP. CP (257±39 W; 3.79±4.1 L·min⁻¹) was higher than [HHb]-BP₃ (205±26 W; 3.48±2.9 L·min⁻¹), [HHb]-BP₁ (207±27 W; 3.27±3.2 L·min⁻¹), and TSI-BP₃ (218±31 W; 3.51±3.0 L·min⁻¹), but not higher than TSI-BP₁ (222±34 W; 3.43±3.2 L·min⁻¹). MLSS (187±26 W; 3.33±3.2 L·min⁻¹) was lower than TSI-BP₃ and TSI-BP₁ for power output, but not different in any comparison for V̇ O₂. The limits of agreement for power output and V̇ O₂ suggest poor agreement among these thresholds. The low level of agreement compromises the use of [HHb]-BP and TSI-BP for estimating MLSS and CP; therefore, these thresholds should not be considered interchangeable.

keywords:

Comparison of NIRS exercise intensity thresholds with maximal lactate steady state, critical power and rowing performance

Leonardo Trevisol Possamai 1 , Fernando Klitzke Borszcz 1 , Rafael Alves de Aguiar 1, 2 , Ricardo Dantas de Lucas 1 , Tiago Turnes 1

Near-infrared spectroscopy, Physiological markers, Exercise intensity domains, Muscle oxygenation, Sports performance

Leonardo Trevisol Possamai

¹

,

Fernando Klitzke Borszcz

¹

,

Rafael Alves de Aguiar

^{1, 2}

,

Ricardo Dantas de Lucas

¹

,

Tiago Turnes

¹