VO2 linear-onset kinetics spanning steady- and non-steady-state exercise

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F44555601%3A13450%2F25%3A43899207" target="_blank" >RIV/44555601:13450/25:43899207 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11140/25:10501298

Výsledek na webu

<a href="https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2025.1547662/full#h7" target="_blank" >https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2025.1547662/full#h7</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3389/fphys.2025.1547662" target="_blank" >10.3389/fphys.2025.1547662</a>

Jazyk výsledku

angličtina

Název v původním jazyce

VO2 linear-onset kinetics spanning steady- and non-steady-state exercise

Popis výsledku v původním jazyce

Introduction: The traditional method for quantifying the kinetics of the increase in the body?s consumption of oxygen (VO2) during exercise transitions to steady state involves application of a mono-exponential function. Anomalies exist to question the validity of this method, as they show the initial (?1 min) of this VO2 response is linear.Methods: Fourteen highly endurance trained subjects (12 males, 2 females) completed a ramp incremental cycling protocol, as well as 8 different constant load trials at 43 to 148 % of their critical power (CP).Results: For the initial five exercise bouts, the linear fit of the initial segment was significantly more accurate (lower standard error of estimates; SE) compared to the mono-exponential fit (p &lt; 0.001). There were two different systematic profiles of the linear onset (LO). VO2 slope from different bouts of increasing exercise intensities; 1) a sustained increase (increased kinetics) (n = 7), and 2) a plateau or decrease (impaired kinetics) (n = 7). Both sub-groups were similar in all measures of cardio-respiratory and muscular endurance.Discussion: The LO VO2 kinetics method is superior to the traditional approach as it was a more valid representation of the initial. VO2 response, can be applied to both steady and non-steady state exercise intensities, requires less than 2 min of exercise, but across multiple bouts, and identifies more complex physiology than the mono-exponential method. Added research is needed to discern the most valid methods to measure LO VO2 kinetics, and to learn more about its physiological determinants compared to the traditional mono-exponential method.

Název v anglickém jazyce

VO2 linear-onset kinetics spanning steady- and non-steady-state exercise

Popis výsledku anglicky

Introduction: The traditional method for quantifying the kinetics of the increase in the body?s consumption of oxygen (VO2) during exercise transitions to steady state involves application of a mono-exponential function. Anomalies exist to question the validity of this method, as they show the initial (?1 min) of this VO2 response is linear.Methods: Fourteen highly endurance trained subjects (12 males, 2 females) completed a ramp incremental cycling protocol, as well as 8 different constant load trials at 43 to 148 % of their critical power (CP).Results: For the initial five exercise bouts, the linear fit of the initial segment was significantly more accurate (lower standard error of estimates; SE) compared to the mono-exponential fit (p &lt; 0.001). There were two different systematic profiles of the linear onset (LO). VO2 slope from different bouts of increasing exercise intensities; 1) a sustained increase (increased kinetics) (n = 7), and 2) a plateau or decrease (impaired kinetics) (n = 7). Both sub-groups were similar in all measures of cardio-respiratory and muscular endurance.Discussion: The LO VO2 kinetics method is superior to the traditional approach as it was a more valid representation of the initial. VO2 response, can be applied to both steady and non-steady state exercise intensities, requires less than 2 min of exercise, but across multiple bouts, and identifies more complex physiology than the mono-exponential method. Added research is needed to discern the most valid methods to measure LO VO2 kinetics, and to learn more about its physiological determinants compared to the traditional mono-exponential method.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

30105 - Physiology (including cytology)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Frontiers in Physiology

ISSN

1664-042X

e-ISSN

1664-042X

Svazek periodika

2025

Číslo periodika v rámci svazku

16

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

16

Strana od-do

1-16

Kód UT WoS článku

001560851400001

EID výsledku v databázi Scopus

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