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Effect of Aging and Aerobic Fitness Level on Heat Dissipation

22 janvier 2020 mis à jour par: Petros Dinas

Effect of Aging and Aerobic Fitness Level on Heat Dissipation in Neutral Conditions

In the context of global aging, the health risk factors associated with exercising or working in the heat for aging population are exacerbated by the rising in global surface temperatures. The purpose of this investigation is to determine at what age the heat loss decrements occur and to examine if aerobic fitness level can affect the heat loss capacity in neutral environmental conditions.

Aperçu de l'étude

Statut

Complété

Les conditions

Intervention / Traitement

Description détaillée

All trials were conducted to indoor gyms with the same environmental temperature and relative humidity, 26 - 30oC and 40-50% respectively, to ensure no difference in body temperature were due to the external thermal stress. The participants were instructed to refrain from intense exercise as well as alcohol and caffeine consumption for 24 hours prior to experimental trial and to had a light meal 2h before their arrival.

Upon arrival, participants would have to wear running shoes, light and short running shorts and light cotton socks. Participants received comprehensive instructions about the shuttle run test and the whole process of measurements. Firstly participants answered the International Physical Activity Questionnaire (IPAQ). Thereafter, anthropometrics data (weight and height) were evaluated as well as the body temperature in external ear canal and axillary. All participants followed five minutes warming up and then performed to 20 m shuttle run test until their volitional limit. Once the participants could no longer run, the test was over and the number of laps was recorded. After the end of the shuttle run, were evaluated the body temperature and the weight of each participants. No fluids consumptions were permitted until the second weighing. They were weighed twice, at baseline and at the end of the running test with a precision weight scale (Kern DE 150K2D, KERN & SOHN GmbH, Balingen, Germany).

Environmental data including air temperature and relative humidity were measured continuously using a portable weather station (LCD Digital Temperature & Humidity Meter HTC-1). The weather station was placed 1 meter above the ground according to the manufacturer's guidelines.

Type d'étude

Interventionnel

Inscription (Réel)

431

Phase

  • N'est pas applicable

Contacts et emplacements

Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.

Lieux d'étude

  • Grèce
    • Thessaly
      • Trikala, Thessaly, Grèce, 42100
        • Department of Exercise Science, University of Thessaly
      • Tríkala, Thessaly, Grèce, 42100
        • FAME Lab, Department of Exercise Science, University of Thessaly

Critères de participation

Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.

Critère d'éligibilité

Âges éligibles pour étudier

9 ans à 60 ans (Enfant, Adulte)

Accepte les volontaires sains

Oui

Sexes éligibles pour l'étude

Tout

La description

Inclusion Criteria:

  • Healthy children and adults

Exclusion Criteria:

  • Diagnosed chronic medical condition;
  • Symptoms of acute illness;
  • Recent (past 4 weeks) usage of medications known to affect the circulatory system, the thyroid, the pituitary function, or the metabolic status

Plan d'étude

Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.

Comment l'étude est-elle conçue ?

Détails de conception

  • Objectif principal: La prévention
  • Répartition: N / A
  • Modèle interventionnel: Affectation à un seul groupe
  • Masquage: Aucun (étiquette ouverte)

Armes et Interventions

Groupe de participants / Bras
Intervention / Traitement
Expérimental: Shuttle run test
At the shuttle run test, participants were required to run between two lines 20 meters apart, while keeping pace with audio signals emitted from a pre-recorded CD. The frequency of the sound signals increases in such way that running speed was increased by 0.5 km h-1 each minute from the starting speed 8.5 km h-1.
Comportemental: Shuttle run test
At the shuttle run test, participants were required to run between two lines 20 meters apart, while keeping pace with audio signals emitted from a pre-recorded CD. The frequency of the sound signals increases in such way that running speed was increased by 0.5 km h-1 each minute from the starting speed 8.5 km h-1.

Que mesure l'étude ?

Principaux critères de jugement

Mesure des résultats
Description de la mesure
Délai
Aerobic fitness level
Délai: Through study completion (a shuttle run test), an average of 15 minutes
Aerobic fitness level was defined by peak oxygen uptake (VO2peak). VO2peak was determined by a 20m shuttle run test. The number of the last announced stage and the equivalent maximal speed from participants' performance were used for its VO2peak estimation
Through study completion (a shuttle run test), an average of 15 minutes
Change from baseline ear canal temperature
Délai: Change from baseline to the end of study completion (a shuttle run test), an average of 15 minutes
Ear canal temperature was recorded twice, at baseline and at the end of the shuttle run test (three times each at the left ear and recorded the mean value), using ear thermometer (IR100, MicrolifeSwitzerland)
Change from baseline to the end of study completion (a shuttle run test), an average of 15 minutes
Change from baseline axillary temperature
Délai: Change from baseline to the end of study completion (a shuttle run test), an average of 15 minutes
Axillary temperature was recorded twice, at baseline and at the end of the shuttle run test, using the electronic digital thermometer (EcoTemp, OMRON, Japan)
Change from baseline to the end of study completion (a shuttle run test), an average of 15 minutes
Physical activity levels
Délai: Once before the shuttle run test
Physical activity of the subject in a usual week was recorded via International Physical Activity Questionnaire. Scores include steps/day and METs/week, with no lower and upper limit
Once before the shuttle run test
Change from baseline body weight
Délai: Change from baseline to the end of study completion (a shuttle run test), an average of 15 minutes
Weight was recorded twice, at baseline and at the end of the shuttle run test, using a precision weight scale (Kern DE 150K2D, KERN & SOHN GmbH, Balingen, Germany
Change from baseline to the end of study completion (a shuttle run test), an average of 15 minutes
Change from baseline whole Body Sweat Rate
Délai: Change from baseline to the end of study completion (a shuttle run test), an average of 15 minutes
Whole Body Sweat Rate was determined by the difference of the pre-test and post-test weight of the participants
Change from baseline to the end of study completion (a shuttle run test), an average of 15 minutes
Air temperature
Délai: Up to 30 minutes, during a one complete shuttle run test
Air temperature was measured continuously using a portable weather station (LCD Digital Temperature & Humidity Meter HTC-1placed) 1 meter above the ground according to the manufacturer's guidelines
Up to 30 minutes, during a one complete shuttle run test
Relative humidity
Délai: Up to 30 minutes, during a one complete shuttle run test
Relative humidity was measured continuously using a portable weather station (LCD Digital Temperature & Humidity Meter HTC-1) placed 1 meter above the ground according to the manufacturer's guidelines
Up to 30 minutes, during a one complete shuttle run test

Collaborateurs et enquêteurs

C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.

Parrainer

Petros Dinas

Dates d'enregistrement des études

Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.

Dates principales de l'étude

Début de l'étude (Réel)

1 mai 2014

Achèvement primaire (Réel)

30 octobre 2018

Achèvement de l'étude (Réel)

30 octobre 2018

Dates d'inscription aux études

Première soumission

16 janvier 2020

Première soumission répondant aux critères de contrôle qualité

22 janvier 2020

Première publication (Réel)

27 janvier 2020

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Réel)

27 janvier 2020

Dernière mise à jour soumise répondant aux critères de contrôle qualité

22 janvier 2020

Dernière vérification

1 janvier 2020

Plus d'information

Termes liés à cette étude

Mots clés

Termes MeSH pertinents supplémentaires

Autres numéros d'identification d'étude

  • 10. Aging and heat loss

Plan pour les données individuelles des participants (IPD)

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INDÉCIS

Informations sur les médicaments et les dispositifs, documents d'étude

Étudie un produit pharmaceutique réglementé par la FDA américaine

Non

Étudie un produit d'appareil réglementé par la FDA américaine

Non

Ces informations ont été extraites directement du site Web clinicaltrials.gov sans aucune modification. Si vous avez des demandes de modification, de suppression ou de mise à jour des détails de votre étude, veuillez contacter register@clinicaltrials.gov. Dès qu'un changement est mis en œuvre sur clinicaltrials.gov, il sera également mis à jour automatiquement sur notre site Web .

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