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Long-lasting exercise involvement protects against decline in O2max and O2 kinetics in moderately active women

Publication: Applied Physiology, Nutrition, and Metabolism
8 July 2020

Abstract

We studied the effects of age on different physiological parameters, including those derived from (i) maximal cardiopulmonary exercise testing (CPET), (ii) moderate-intensity step transitions, and (iii) tensiomyography (TMG)-derived variables in moderately active women. Twenty-eight women (age, 19 to 53 years), completed 3 laboratory visits, including baseline data collection, TMG assessment, maximal oxygen uptake test via CPET, and a step-transition test from 20 W to a moderate-intensity cycling power output (PO), corresponding to oxygen uptake at 90% gas exchange threshold. During the step transitions, breath-by-breath pulmonary oxygen uptake, near infrared spectroscopy derived muscle deoxygenation (ΔHHb), and beat-by-beat cardiovascular response were continuously monitored. There were no differences observed between the young and middle-aged women in their maximal oxygen uptake and peak PO, while the maximal heart rate (HR) was 12 bpm lower in middle-aged compared with young (p = 0.016) women. Also, no differences were observed between the age groups in τ pulmonary oxygen uptake, ΔHHb, and τHR during on-transients. The first regression model showed that age did not attenuate the maximal CPET capacity in the studied population (p = 0.638), while in the second model a faster τ pulmonary oxygen uptake, combined with shorter TMG-derived contraction time (Tc) of the vastus lateralis (VL), were associated with a higher maximal oxygen uptake (∼30% of explained variance, p = 0.039). In conclusion, long lasting exercise involvement protects against a maximal oxygen uptake and τpulmonary oxygen uptake deterioration in moderately active women.
Novelty:
Faster τ pulmonary oxygen uptake and shorter Tc of the VL explain 33% of the variance in superior maximal oxygen uptake attainment.
No differences between age groups were found in τ pulmonary oxygen uptake, τΔHHb, and τHR during on-transients.

Résumé

Nous examinons les effets de l'âge sur différents paramètres physiologiques, y compris ceux dérivés (i) du test d’effort cardiopulmonaire maximal (« CPET »), (ii) des transitions par paliers d’intensité modérée et (iii) des variables dérivées de la tensiomyographie (« TMG ») chez les femmes modérément actives. Vingt-huit femmes (tranche d’âge de 19 à 53 ans) se présentent trois fois au laboratoire pour la collecte des données de base, l’évaluation TMG, le CPET pour la mesure de la consommation maximale d’oxygène et un test de transition par paliers de 20 W à une puissance de pédalage d’intensité modérée correspondant au consommation d’oxygène au seuil d’échange des gaz de 90 %. À chaque palier, la consommation d’oxygène pulmonaire par respiration, la désoxygénation musculaire dérivée de la spectroscopie proche infrarouge (« ΔHHb ») et la réponse cardiovasculaire battement par battement sont évaluées en continu. Aucune différence de la consommation maximale d’oxygène et de PO de pointe n’est observée entre les femmes jeunes et d’âge moyen tandis que la HR max est de 12 bpm inférieure chez les femmes d’âge moyen comparativement aux femmes jeunes (p = 0,016). De plus, aucune différence de τ consommation d’oxygène pulmonaire par respiration, ΔHHb et τHR n’est observée entre les groupes d’âge pendant les paliers. Le premier modèle de régression montre que l’âge n’atténue pas le résultat au CPET dans l’échantillon étudié (p = 0,638) tandis que dans le deuxième modèle, un τ consommation d’oxygène pulmonaire par respiration plus rapide combiné à un temps de contraction (« Tc ») plus court dérivé du TMG du vastus lateralis (« VL ») sont associés à une consommation maximale d’oxygène plus élevé (∼ 30 % de la variance expliquée, p = 0,039). En conclusion, la participation à un exercice de longue durée protège contre une détérioration de la consommation maximale d’oxygène et du τ consommation d’oxygène pulmonaire par respiration chez les femmes modérément actives. [Traduit par la Rédaction]
Les nouveautés :
Une τ la consommation d’oxygène pulmonaire par respiration plus rapide et un Tc plus court du VL expliquent 33 % de la variance dans l’obtention d’une valeur supérieure de la consommation maximale d’oxygène.
Aucune différence de τ consommation d’oxygène pulmonaire, τΔHHb, τHR entre les groupes d’âge n'est observée durant les paliers

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Published In

cover image Applied Physiology, Nutrition, and Metabolism
Applied Physiology, Nutrition, and Metabolism
Volume 46Number 2February 2021
Pages: 108 - 116

History

Received: 22 April 2020
Accepted: 29 June 2020
Accepted manuscript online: 8 July 2020
Version of record online: 8 July 2020

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Key Words

  1. ageing
  2. O2
  3. muscle fiber composition
  4. near infrared spectroscopy
  5. cycling

Mots-clés

  1. vieillissement
  2. O2
  3. composition des fibres musculaires
  4. spectroscopie proche infrarouge
  5. cyclisme

Authors

Affiliations

Damir Zubac [email protected]
Institute for Kinesiology Research, Science and Research Center of Koper, Koper, Slovenia.
Faculty of Kinesiology, University of Split, Split, Croatia.
Vladimir Ivančev
Faculty of Kinesiology, University of Split, Split, Croatia.
Zoran Valić
Department of Integrative Physiology, University of Split, School of Medicine, Split, Croatia.
Boštjan Šimunič
Institute for Kinesiology Research, Science and Research Center of Koper, Koper, Slovenia.

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