Background: Multiple factors influence substrate oxidation during exercise including exercise duration and intensity, sex, and dietary intake before and during exercise. However, the relative influence and interaction between these factors is unclear.
Objectives: Our aim was to investigate factors influencing the respiratory exchange ratio (RER) during continuous exercise and formulate multivariable regression models to determine which factors best explain RER during exercise, as well as their relative influence.
Methods: Data were extracted from 434 studies reporting RER during continuous cycling exercise. General linear mixed-effect models were used to determine relationships between RER and factors purported to influence RER (e.g., exercise duration and intensity, muscle glycogen, dietary intake, age, and sex), and to examine which factors influenced RER, with standardized coefficients used to assess their relative influence.
Results: The RER decreases with exercise duration, dietary fat intake, age, VO, and percentage of type I muscle fibers, and increases with dietary carbohydrate intake, exercise intensity, male sex, and carbohydrate intake before and during exercise. The modelling could explain up to 59% of the variation in RER, and a model using exclusively easily modified factors (exercise duration and intensity, and dietary intake before and during exercise) could only explain 36% of the variation in RER. Variables with the largest effect on RER were sex, dietary intake, and exercise duration. Among the diet-related factors, daily fat and carbohydrate intake have a larger influence than carbohydrate ingestion during exercise.
Conclusion: Variability in RER during exercise cannot be fully accounted for by models incorporating a range of participant, diet, exercise, and physiological characteristics. To better understand what influences substrate oxidation during exercise further research is required on older subjects and females, and on other factors that could explain additional variability in RER.
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http://dx.doi.org/10.1007/s40279-022-01727-7 | DOI Listing |
Front Med (Lausanne)
January 2025
Xuanwu Hospital, Capital Medical University, Beijing, China.
Purpose: To study the effects of breathing exercises on preventing pulmonary complications in patients undergoing coronary artery bypass graft surgery.
Methods: Observing whether preoperative breathing exercises can reduce the incidence of postoperative pulmonary complications in patients undergoing coronary artery bypass graft surgery; observing whether these exercises can improve postoperative arterial oxygen pressure, oxygen saturation, and the distance walked in a six-minute walk test after surgery; as well as reduce hospital stay duration, lower treatment costs, and improve the quality of life as measured by the Short Form-36 Health Survey (SF-36).
Design: The study population includes patients undergoing coronary artery bypass graft surgery under general anesthesia; the research center is Capital Medical University Xuanwu Hospital; the sample size is 120.
Pak J Med Sci
January 2025
Syed Imran Mehmood, MBBS, MA, MMedED (UK), PhD (Netherlands) Dow Institute of Health Professionals Education, Dow University of Health Sciences, Karachi, Pakistan.
Background And Objective: In medical education, the challenging constructs of emotional intelligence and professionalism are increasingly being addressed worldwide and seem to share common characteristic components. The objective of this study was to determine the association between emotional intelligence and professionalism as perceived and self-reported by medical students and to explore the gender difference in these two variables.
Methods: It is a cross-sectional study of eight months duration, from February-September 2019, that included final year medical students at Dow Medical College through convenience sampling.
Front Pediatr
January 2025
Division of Pediatric Cardiology, Division of Pediatrics, Children's Mercy Hospital, University of Missouri-Kansas City, Kansas City, MO, United States.
Background: In adolescents and adults with tetralogy of Fallot (TOF), right ventricle (RV) electromechanical dyssynchrony (EMD) due to right bundle branch block (RBBB) is associated with reduced exercise capacity and RV dysfunction. While the development of RBBB following surgical repair of tetralogy of Fallot (rTOF) is a frequent sequela, it is not known whether EMD is present in every patient immediately following rTOF. The specific timing of the onset of RBBB following rTOF therefore provides an opportunity to assess whether acute RBBB is associated with the simultaneous acquisition of EMD.
View Article and Find Full Text PDFColon cancer poses a significant threat to global health, and studies have shown a correlation between physical activity (PA) and the incidence of colon cancer. However, existing research has not quantitatively analyzed PA to evaluate its impact on the risk of colon cancer comprehensively. Data related to the study were obtained from the NHANES database for participants aged 20 and above between 2007 and 2018.
View Article and Find Full Text PDFLife Sci Space Res (Amst)
February 2025
Department of Biomedical Engineering, Center for Injury Biomechanics, Wake Forest University School of Medicine. 575 N. Patterson Avenue, Suite 530. Winston-Salem, NC 27101, USA. Electronic address:
Muscle atrophy occurs with extended exposure to microgravity. This study quantified the overall muscle size, lean muscle area and fat infiltration changes pre- to post-flight that occur in the thoracic and lumbar spine with long-duration spaceflight. Pre- and post-flight magnetic resonance imaging (MRI) scans were obtained from 9 crewmembers on long-duration (≥6 months) International Space Station (ISS) missions.
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