ArticleClinical medicine. Circulatory, respiratory and pulmonary medicine2008
The Respiratory Exchange Ratio is Associated with Fitness Indicators Both in Trained and Untrained Men: A Possible Application for People with Reduced Exercise Tolerance.
Article in Clinical medicine. Circulatory, respiratory and pulmonary medicine, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT04029532 (Factors Associated With Obesity in Adult Women), which is not on this map. Cited by 71 papers, 4 of them syntheses that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Factors Associated With Obesity in Adult Women: Respiratory Exchange Ratio, Heart Rate Variation and Body Image
Who cites it
71 citing papers in PubMed, 4 syntheses or guidelines pooled it, 132 citations in OpenAlex.
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- The Use of Acute Exercise Interventions as Game Day Priming Strategies to Improve Physical Performance and Athlete Readiness in Team-Sport Athletes: A Systematic Review.Sports medicine (Auckland, N.Z.) · 2020Pooled it
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- Adaptive mediolateral control during split-belt walking: Energetics of interlimb coordination and enhanced savings following acute intermittent hypoxia.Experimental physiology · 2026Article
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- Awareness and Knowledge of Exercise Physiology Among Syrian Medical Students: A Cross-Sectional Study.BioMed research international · 2026Article
- Changes in aerobic capacity to prepubertal children in sports 12-month training period.Annals of medicine · 2025Article
- Physiological, Performance, and Oxidative Stress Responses to High-Intensity Uphill and Downhill Interval Training.Journal of functional morphology and kinesiology · 2025Article
- Sex- and endurance training-mediated cardiovascular protection through lipids during exercise.Trends in endocrinology and metabolism: TEM · 2025Review
- Skeletal muscle energetics during submaximal contractions are linked to metabolic performance during ambulatory exercise: A pilot study in male adults.Physiological reports · 2025Article
- Association between cardiorespiratory fitness and total brain myelin volume among older adults.European review of aging and physical activity : official journal of the European Group for Research into Elderly and Physical Activity · 2025Article
- Machine learning models for reinjury risk prediction using cardiopulmonary exercise testing (CPET) data: optimizing athlete recovery.BioData mining · 2025Article
- On-farm analysis of exhaled breath compounds as indicators for a postpartum health score in dairy cattle: a case study.Journal of animal science · 2025Article
- Effect of Glycated Haemoglobin (HBA1c) on Cardiorespiratory Fitness (CRF) in a Population with Type 2 Diabetes Mellitus (T2DM): A Cross-Sectional Study.Medicina (Kaunas, Lithuania) · 2024Article
- Professional long distance runners achieve high efficiency at the cost of weak orbital stability.Heliyon · 2024Article
11 more citing papers are in PubMed but not listed here.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
7 authors at 5 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThe respiratory exchange ratio (RER) indirectly shows the muscle's oxidative capacity to get energy. Sedentarism, exercise and physically active lifestyles modify it. For that reason, this study evaluates the associations between RER during sub-maximum exercise and other well established fitness indicators (body fat, maximum heart rate, maximum O(2) uptake, workload, and lactate threshold), in physically active trained and untrained men.
methodsThe RER, O(2) uptake and blood lactate were measured in eight endurance trained and eight untrained men (age, 22.9 ± 4.5 vs. 21.9 ± 2.8 years; body mass, 67.1 ± 5.4 vs. 72.2 ± 7.7 kg; body fat, 10.6 ± 2.4% vs. 16.6 ± 3.8% and maximum O(2) uptake, 68.9 ± 6.3 vs. 51.6 ± 5.8 ml•kg(-1)•min(-1)), during maximum exercise test and during three different sub-maximum exercises at fixed workload: below, within or above the lactate threshold.
resultsEndurance trained men presented higher O(2) uptake, lower blood lactate concentrations and lower RER values than those in untrained men at the three similar relative workloads. Even though with these differences in RER, a strong association (p < 0.05) of RER during sub-maximum exercise with the other well established fitness indicators was observed, and both maximum O(2) uptake and lactate threshold determined more than 57% of its variance (p < 0.05).
conclusionsThese data demonstrate that RER measurement under sub-maximum exercise conditions was well correlated with other established physical fitness indicators, despite training condition. Furthermore, the results suggest that RER could help obtain an easy approach of fitness status under low exercise intensity and could be utilized in subjects with reduced exercise tolerance.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.