Effect of Hypoxia on Maximal Fat Oxidation Rate During Incremental Cycling: Relationship to the Gas Exchange Threshold

الموضوعات

طب

الملخص

The maximum fat oxidation rate (MFO) has been suggested to provide useful information regarding endurance training status in athletes, but also as an index of metabolic health in untrained populations. Training in hypoxia is a popular method used by athletes for the purpose of performance enhancement and is emerging as a therapeutic intervention to improve cardiometabolic health. It is known that the addition of hypoxia to exercise induces a shift towards carbohydrate utilization, however the few studies that examined fat oxidation in hypoxia reported equivocal results. This may be due to differences in the methods used to normalize relative intensity. The aim of this study was to evaluate MFO in normoxia (NORM) and hypoxia (HYPO) during exercise at intensities matched relative to the respiratory compensation point (RCP). Methods Seventeen recreationally active adults (5 females/12 males; age: 36.2 ± 7.4 year; body mass: 76.6 ± 13.1 kg) performed a ramp and a step incremental test, in NORM (The fraction of inspired oxygen; FiO2 ≈ 21%) and HYPO (FiO2 ≈ 13.5%), on separate days. The gas exchange threshold (GET), RCP, and the maximum volume of oxygen consumption (V̇O2max) were determined from the ramp tests. The step test involved 6 constant load stages (4-8 minutes) matched for intensity relative to the RCP in each condition. Indirect calorimetry was used to estimate MFO rate during the step test. Each participant’s diet, fasting hours, and testing time were consistent between conditions. Paired t-tests and a 2-way ANOVA were used to examine differences between NORM and HYPO. Pearson correlation was used to assess the relationship between MFO and GET.

روابط وملفات

التعريف والنوع

رقم الوثيقة

ee4b7534-ba8f-42f3-8044-908a60db0627

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

ee4b7534-ba8f-42f3-8044-908a60db0627_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"Nathan Townsend","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"Youmna Elsayed Hassanein","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

Effect of Hypoxia on Maximal Fat Oxidation Rate During Incremental Cycling: Relationship to the Gas Exchange Threshold

المحتوى والصفحات

عدد الصفحات

0

كلمات الباحثين

Maximum fat oxidation rate - Hypoxia - Respiratory compensation point - Gas exchange threshold Normoxia

إشراف وإعداد

الإشراف

Nathan Townsend

الإعداد

Youmna Elsayed Hassanein

الاقتباسات الببليوغرافية