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Muñoz A, Aguilar-Navarro M, Ruiz-Moreno C, Varillas-Delgado D, Amaro-Gahete FJ, Gutiérrez-Hellín J, Del Coso J, López-Samanes Á. Influence of the time of day in the effect of caffeine on maximal fat oxidation during exercise in women: a randomized, crossover, double-blind, and placebo-controlled study. Eur J Appl Physiol 2024; 124:849-859. [PMID: 37728787 DOI: 10.1007/s00421-023-05312-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 08/28/2023] [Indexed: 09/21/2023]
Abstract
PURPOSE Caffeine is a stimulant with well-recognized performance and metabolic benefits, however, there is a lack of studies investigating the time-of-day influence in the properties of caffeine to enhance fat oxidation in women. Thus, the aim of the present study was to evaluate the influence of the time of the day on the effect of caffeine on the maximal rate of fat oxidation during aerobic exercise in trained women. METHODS Fourteen female athletes (25.5 ± 7.1 years) took part in a randomized, crossover, double-blind study. All participants undertook four different experimental trials combining the ingestion of 3 mg/kg caffeine and a placebo either in the morning (8.00-10.00 h) and in the evening (17.00-19.00 h) realizing an incremental test on a cycle ergometer with 3 min stages at workloads from 30 to 70% of maximal oxygen uptake (VO2max). Substrate oxidation rates were measured by indirect calorimetry. In each trial, the maximum rate of fat oxidation (MFO) and the intensity that elicited MFO (Fatmax) were measured. RESULTS In comparison to placebo, MFO was significantly higher with caffeine both in the morning (0.24 ± 0.13 vs 0.30 ± 0.14 g/min; p < 0.001; ES = 0.79) and in the evening (0.21 ± 0.08 vs 0.28 ± 0.10 g/min; p = 0.002; ES = 0.72). No time-of-day effect on the capacity of caffeine to increase MFO was found (all p = 0.336) CONCLUSION: The intake of 3 mg/kg of caffeine increased the use of fat as a fuel during exercise independently of the time-of-day in trained women. TRIAL REGISTRATION The study was registered in ClinicalTrials.gov with the following ID: NCT05880186 by 15 May 2023.
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Affiliation(s)
- Alejandro Muñoz
- Faculty of Health Sciences, Universidad Francisco de Vitoria, Ctra. Pozuelo-Majadahonda Km 1,800, 28223, Pozuelo de Alarcón, Madrid, Spain
| | - Millán Aguilar-Navarro
- Faculty of Health Sciences, Universidad Francisco de Vitoria, Ctra. Pozuelo-Majadahonda Km 1,800, 28223, Pozuelo de Alarcón, Madrid, Spain
| | - Carlos Ruiz-Moreno
- Exercise Physiology Laboratory, Camilo José Cela University, Madrid, Spain
| | - David Varillas-Delgado
- Faculty of Health Sciences, Universidad Francisco de Vitoria, Ctra. Pozuelo-Majadahonda Km 1,800, 28223, Pozuelo de Alarcón, Madrid, Spain.
| | - Francisco J Amaro-Gahete
- Department of Physiology, Faculty of Medicine, EFFECTS-262 Research Group, University of Granada, Granada, Spain
- PROmoting FITness and Health Through Physical Activity Research Group (PROFITH), Department of Physical and Sports Education, Faculty of Sports Science, University of Granada, Granada, Spain
- Centro de Investigación Biomédica en Red Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain
| | - Jorge Gutiérrez-Hellín
- Faculty of Health Sciences, Universidad Francisco de Vitoria, Ctra. Pozuelo-Majadahonda Km 1,800, 28223, Pozuelo de Alarcón, Madrid, Spain
| | - Juan Del Coso
- Sport Sciences Research Centre, Rey Juan Carlos University, Madrid, Spain
| | - Álvaro López-Samanes
- Department of Education, Research and Evaluation Methods, Comillas Pontifical University, Madrid, Spain
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Chávez-Guevara IA, Peric R, Amaro-Gahete FJ, Ramos-Jiménez A. Reliability of the Metabolic Response During Steady-State Exercise at FATmax in Young Men with Obesity. RESEARCH QUARTERLY FOR EXERCISE AND SPORT 2024:1-9. [PMID: 38324773 DOI: 10.1080/02701367.2024.2311641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 01/15/2024] [Indexed: 02/09/2024]
Abstract
Purpose: In this study we evaluated the reliability of blood lactate levels (BLa), energy expenditure and substrate utilization during prolonged exercise at the intensity that elicits maximal fat oxidation (FATmax). Furthermore, we investigated the accuracy of a single graded exercise test (GXT) for predicting energy metabolism at FATmax. Methods: Seventeen young men with obesity (26 ± 6 years; 36.4 ± 7.2 %body fat) performed a GXT on a treadmill in a fasted state (10-12 h) for the assessment of FATmax and cardiorespiratory fitness. Afterward, each subject performed two additional prolonged FATmax trials (102 ± 11 beats·min-1; 60-min) separated by 7 days. Indirect calorimetry was used for the assessment of energy expenditure and substrate utilization kinetics whereas capillary blood samples were taken for the measurement of BLa. Results: The BLa (limits of agreement (LoA): -1.2 to 0.8 mmol∙L-1; p = 1.0), fat utilization (LoA: -8.0 to 13.4 g∙h-1; p = 0.06), and carbohydrate utilization (LoA: -27.6 to 22.4 g∙h-1; p = 0.41) showed a good agreement whereas a modest systematic bias was found for energy expenditure (LoA: -16811 to 33355 kJ∙h-1; p < 0.05). All the aforementioned parameters showed a moderate to good reliability (Intraclass correlation coefficient: 0.67-0.92). The GXT overestimated fat (~46%) and carbohydrate (~26%) utilization as well as energy expenditure (36%) during steady-state exercise at FATmax. Conversely the GXT underestimated BLa (~28%). Conclusion: a single GXT cannot be used for an accurate prediction of energy metabolism during prolonged exercise in men with obesity. Thus, an additional steady-state FATmax trial (40-60 min) should be performed for a tailored and precise exercise prescription.
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Affiliation(s)
| | - Ratko Peric
- Orthopedic Clinic Orthosport
- University of Split
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Andrade DC, Arce‐Álvarez A, Salazar‐Ardiles C, Toledo C, Guerrero‐Henriquez J, Alvarez C, Vasquez‐Muñoz M, Izquierdo M, Millet GP. Hypoxic peripheral chemoreflex stimulation-dependent cardiorespiratory coupling is decreased in swimmer athletes. Physiol Rep 2024; 12:e15890. [PMID: 38195247 PMCID: PMC10776339 DOI: 10.14814/phy2.15890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 11/07/2023] [Accepted: 11/21/2023] [Indexed: 01/11/2024] Open
Abstract
Swimmer athletes showed a decreased ventilatory response and reduced sympathetic activation during peripheral hypoxic chemoreflex stimulation. Based on these observations, we hypothesized that swimmers develop a diminished cardiorespiratory coupling due to their decreased hypoxic peripheral response. To resolve this hypothesis, we conducted a study using coherence time-varying analysis to assess the cardiorespiratory coupling in swimmer athletes. We recruited 12 trained swimmers and 12 control subjects for our research. We employed wavelet time-varying spectral coherence analysis to examine the relationship between the respiratory frequency (Rf ) and the heart rate (HR) time series during normoxia and acute chemoreflex activation induced by five consecutive inhalations of 100% N2 . Comparing swimmers to control subjects, we observed a significant reduction in the hypoxic ventilatory responses to N2 in swimmers (0.012 ± 0.001 vs. 0.015 ± 0.001 ΔVE /ΔVO2 , and 0.365 ± 0.266 vs. 1.430 ± 0.961 ΔVE /ΔVCO2 /ΔSpO2 , both p < 0.001, swimmers vs. control, respectively). Furthermore, the coherence at the LF cutoff during hypoxia was significantly lower in swimmers compared to control subjects (20.118 ± 3.502 vs. 24.935 ± 3.832 area under curve [AUC], p < 0.012, respectively). Our findings strongly indicate that due to their diminished chemoreflex control, swimmers exhibited a substantial decrease in cardiorespiratory coupling during hypoxic stimulation.
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Affiliation(s)
- David C. Andrade
- Exercise Applied Physiology Laboratory, Centro de Investigación en Fisiología y Medicina de Altura (FIMEDALT), Departamento Biomedico, Facultad de Ciencias de la SaludUniversidad de AntofagastaAntofagastaChile
| | - Alexis Arce‐Álvarez
- Escuela de Kinesiología, Facultad de Odontología y Ciencias de la RehabilitaciónUniversidad San SebastiánSantiagoChile
| | - Camila Salazar‐Ardiles
- Exercise Applied Physiology Laboratory, Centro de Investigación en Fisiología y Medicina de Altura (FIMEDALT), Departamento Biomedico, Facultad de Ciencias de la SaludUniversidad de AntofagastaAntofagastaChile
- NavarrabiomedHospital Universitario de Navarra (UHN), Universidad Pública de Navarra (UPNA), IdiSNAPamplonaNavarraSpain
| | - Camilo Toledo
- Laboratory of Cardiorespiratory and Sleep Physiology. Institute of Physiology. Faculty of MedicineUniversidad Austral de ChileValdiviaChile
| | - Juan Guerrero‐Henriquez
- Centro de Investigación en Fisiología y Medicina de Altura (FIMEDALT), Departamento de Ciencias de la Rehabilitación y el Movimiento Humano, Facultad de Ciencias de la SaludUniversidad de AntofagastaAntofagastaChile
| | - Cristian Alvarez
- Exercise and Rehabilitation Sciences Institute, School of Physical Therapy, Faculty of Rehabilitation SciencesUniversidad Andres BelloSantiagoChile
| | - Manuel Vasquez‐Muñoz
- Dirección de Docencia de Especialidades Médicas, Dirección de Postgrado, Facultad de Medicina y Ciencias de la SaludUniversidad MayorSantiagoChile
| | - Mikel Izquierdo
- NavarrabiomedHospital Universitario de Navarra (UHN), Universidad Pública de Navarra (UPNA), IdiSNAPamplonaNavarraSpain
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Chávez-Guevara IA, Amaro-Gahete FJ, Ramos-Jiménez A, Brun JF. Toward Exercise Guidelines for Optimizing Fat Oxidation During Exercise in Obesity: A Systematic Review and Meta-Regression. Sports Med 2023; 53:2399-2416. [PMID: 37584843 DOI: 10.1007/s40279-023-01897-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/14/2023] [Indexed: 08/17/2023]
Abstract
BACKGROUND Exercise training performed at maximal fat oxidation (FATmax) is an efficient non-pharmacological approach for the management of obesity and its related cardio-metabolic disorders. OBJECTIVES Therefore, this work aimed to provide exercise intensity guidelines and training volume recommendations for maximizing fat oxidation in patients with obesity. METHODS A systematic review of original articles published in English, Spanish or French languages was carried out in EBSCOhost, PubMed and Scopus by strictly following the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) statement. Those studies that analyzed maximal fat oxidation (MFO) and FATmax in patients with obesity (body fat > 25% for men; > 35% for women) by calculating substrate oxidation rates through indirect calorimetry during a graded exercise test with short-duration stages (< 10 min) were selected for quantitative analysis. The accuracy of relative oxygen uptake (% peak oxygen uptake [%[Formula: see text]O2peak]) and relative heart rate (% peak heart rate [%HRpeak]) for establishing FATmax reference values was investigated by analyzing their intra-individual and inter-study variation. Moreover, cluster analysis and meta-regression were used for determining the influence of biological factors and methodological procedures on MFO and FATmax. RESULTS Sixty-four manuscripts were selected from 146 records; 23 studies only recruited men (n = 465), 14 studies only evaluated women (n = 575), and 27 studies included individuals from both sexes (n = 6434). The majority of the evaluated subjects were middle-aged adults (aged 40-60 y; 84%) with a poor cardiorespiratory fitness (≤ 43 mL·kg-1·min-1; 81%), and the reported MFO ranged from 0.27 to 0.33 g·min-1. The relative heart rate at FATmax (coefficient of variation [CV]: 8.8%) showed a lower intra-individual variation compared with relative oxygen uptake (CV: 17.2%). Furthermore, blood lactate levels at FATmax ranged from 1.3 to 2.7 mmol·L-1 while the speed and power output at FATmax fluctuated from 4 to 5.1 km·h-1 and 42.8-60.2 watts, respectively. Age, body mass index, cardiorespiratory fitness, FATmax, the type of ergometer and the stoichiometric equation used to calculate the MFO independently explained MFO values (R2 = 0.85; p < 0.01). The MFO in adolescents was superior in comparison with MFO observed in young and middle-aged adults. On the other hand, the MFO was higher during treadmill walking in comparison with stationary cycling. Body fat and MFO alone determined 29% of the variation in FATmax (p < 0.01), noting that individuals with body fat > 35% showed a heart rate of 61-66% HRpeak while individuals with < 35% body fat showed a heart rate between 57 and 64% HRpeak. Neither biological sex nor the analytical procedure for computing the fat oxidation kinetics were associated with MFO and FATmax. CONCLUSION Relative heart rate rather than relative oxygen uptake should be used for establishing FATmax reference values in patients with obesity. A heart rate of 61-66% HRpeak should be recommended to patients with > 35% body fat while a heart rate of 57-64% HRpeak should be recommended to patients with body fat < 35%. Moreover, training volume must be higher in adults to achieve a similar fat oxidation compared with adolescents whereas exercising on a treadmill requires a lower training volume to achieve significant fat oxidation in comparison with stationary cycling.
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Affiliation(s)
- Isaac A Chávez-Guevara
- Department of Chemical Sciences, Biomedical Sciences Institute, Autonomous University of Ciudad Juarez, 32310, Chihuahua, Mexico.
- Department of Health Sciences, Biomedical Sciences Institute, Autonomous University of Ciudad Juarez, 32310, Chihuahua, Mexico.
| | - Francisco J Amaro-Gahete
- Department of Physiology, Faculty of Medicine, EFFECTS-262 Research Group, University of Granada, 18016, Granada, Spain
- PROmoting FITness and Health Through Physical Activity Research Group (PROFITH), Department of Physical and Sports Education, Faculty of Sports Science, University of Granada, 18011, Granada, Spain
- Centro de Investigación Biomédica en Red Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, 28029, Madrid, Spain
| | - Arnulfo Ramos-Jiménez
- Department of Chemical Sciences, Biomedical Sciences Institute, Autonomous University of Ciudad Juarez, 32310, Chihuahua, Mexico
- Department of Health Sciences, Biomedical Sciences Institute, Autonomous University of Ciudad Juarez, 32310, Chihuahua, Mexico
| | - Jean Frederic Brun
- Department of Endocrinology and Diabetes, Hôpital Lapeyronie CHRU Montpellier, PHYMEDEXP, Université de Montpellier, Montpellier, France.
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de Beukelaar TT, Mantini D. Monitoring Resistance Training in Real Time with Wearable Technology: Current Applications and Future Directions. Bioengineering (Basel) 2023; 10:1085. [PMID: 37760187 PMCID: PMC10525173 DOI: 10.3390/bioengineering10091085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 08/30/2023] [Accepted: 09/12/2023] [Indexed: 09/29/2023] Open
Abstract
Resistance training is an exercise modality that involves using weights or resistance to strengthen and tone muscles. It has become popular in recent years, with numerous people including it in their fitness routines to ameliorate their strength, muscle mass, and overall health. Still, resistance training can be complex, requiring careful planning and execution to avoid injury and achieve satisfactory results. Wearable technology has emerged as a promising tool for resistance training, as it allows monitoring and adjusting training programs in real time. Several wearable devices are currently available, such as smart watches, fitness trackers, and other sensors that can yield detailed physiological and biomechanical information. In resistance training research, this information can be used to assess the effectiveness of training programs and identify areas for improvement. Wearable technology has the potential to revolutionize resistance training research, providing new insights and opportunities for developing optimized training programs. This review examines the types of wearables commonly used in resistance training research, their applications in monitoring and optimizing training programs, and the potential limitations and challenges associated with their use. Finally, it discusses future research directions, including the development of advanced wearable technologies and the integration of artificial intelligence in resistance training research.
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Affiliation(s)
| | - Dante Mantini
- Movement Control and Neuroplasticity Research Group, Department of Movement Sciences, KU Leuven, 3001 Leuven, Belgium;
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Varillas-Delgado D, Aguilar-Navarro M, Muñoz A, López-Samanés Á, Ruiz-Moreno C, Posada-Ayala M, Amaro-Gahete FJ, Del Coso J, Gutiérrez-Hellín J. Effect of 3 and 6 mg/kg of caffeine on fat oxidation during exercise in healthy active females. Biol Sport 2023; 40:827-834. [PMID: 37398977 PMCID: PMC10286602 DOI: 10.5114/biolsport.2023.121321] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 08/26/2022] [Accepted: 10/05/2022] [Indexed: 09/21/2023] Open
Abstract
The aim of this study was to investigate the effect of 3 and 6 mg of caffeine per kg of body mass (mg/kg) on whole-body substrate oxidation during an incremental cycling exercise test in healthy active women. Using a double-blind placebo-controlled counterbalanced experimental design, 14 subjects performed three identical exercise trials after the ingestion of 3 or 6 mg/kg of caffeine or placebo. The exercise trials consisted of an incremental test on a cycle ergometer with 3-min stages at workloads from 30 to 70% of maximal oxygen uptake (VO2max). Substrate oxidation rates were measured by indirect calorimetry. During exercise, there was a significant effect of substance (F = 5.221; p = 0.016) on fat oxidation rate. In comparison to the placebo, 3 mg/kg of caffeine increased fat oxidation rates at 30 to 60% of VO2max (all p < 0.050) and 6 mg/kg at 30 to 50% of VO2max (all p < 0.050). There was also a significant effect of substance (F = 5.221; p = 0.016) on carbohydrate oxidation rate (F = 9.632; p < 0.001). In comparison to placebo, both caffeine doses decreased carbohydrate oxidation rates at 40 to 60% VO2max (all p < 0.050). The maximal rate of fat oxidation with placebo was 0.24 ± 0.03 g/min, which increased with 3 mg/kg to 0.29 ± 0.04 g/min (p = 0.032) and to 0.29 ± 0.03 with 6 mg/kg of caffeine (p = 0.042). Acute intake of caffeine improves the utilization of fat as a fuel during submaximal aerobic exercise in healthy active women with an effect of similar magnitude after the intake of 3 and 6 mg of caffeine per kg of body mass. Thus, the use of 3 mg/kg of caffeine would be more recommended than 6 mg/kg for women seeking increased fat utilization during submaximal exercise.
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Affiliation(s)
| | | | - Alejandro Muñoz
- Universidad Francisco de Vitoria, Faculty of Health Sciences, Madrid, Spain
| | | | - Carlos Ruiz-Moreno
- Camilo José Cela University, Exercise Physiology Laboratory, Madrid, Spain
| | - María Posada-Ayala
- Universidad Francisco de Vitoria, Faculty of Experimental Sciences, Madrid, Spain
| | | | - Juan Del Coso
- Centre for Sport Studies, Rey Juan Carlos University, Madrid, Spain
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Gutiérrez-Hellín J, Aguilar-Navarro M, Ruiz-Moreno C, Muñoz A, Varillas-Delgado D, Amaro-Gahete FJ, Del Coso J. Effect of caffeine intake on fat oxidation rate during exercise: is there a dose-response effect? Eur J Nutr 2023; 62:311-319. [PMID: 35972531 DOI: 10.1007/s00394-022-02988-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 08/05/2022] [Indexed: 02/07/2023]
Abstract
PURPOSE The effect of caffeine to enhance fat utilisation as fuel for submaximal aerobic exercise is well established. However, it is unknown whether this effect is dose dependent. The aim of this study was to investigate the effect of 3 and 6 mg of caffeine per kg of body mass (mg/kg) on whole-body substrate oxidation during an incremental cycling exercise test. METHODS In a double-blind, randomised, and counterbalanced experiment, 18 recreationally active males (maximal oxygen uptake [VO2max] = 56.7 ± 8.2 mL/kg/min) performed three experimental trials after ingesting either 3 mg/kg of caffeine, 6 mg/kg of caffeine or a placebo (cellulose). The trials consisted of an incremental exercise test on a cycle ergometer with 3-min stages at workloads from 30 to 80% of VO2max. Energy expenditure, fat oxidation rate, and carbohydrate oxidation rate were continuously measured by indirect calorimetry. RESULTS During exercise, there was significant effect of substance (F = 7.969; P = 0.004) on fat oxidation rate. In comparison to the placebo, the rate of fat oxidation was higher with 3 mg/kg of caffeine at 30, 40, 50 and 70% of VO2max [all P < 0.050, effect sizes (ES) from 0.38 to 0.50] and with 6 mg/kg of caffeine at 30, 40, 50, 60 and 70% of VO2max (all P < 0.050, ES from 0.28 to 0.76). Both 3 mg/kg (0.40 ± 0.21 g/min, P = 0.021, ES = 0.57) and 6 mg/kg of caffeine (0.40 ± 0.17 g/min P = 0.001, ES = 0.60) increased the maximal rate of fat oxidation during exercise over the placebo (0.31 ± 0.15 g/min). None of the caffeine doses produced any significant effect on energy expenditure or heart rate during exercise, while both caffeine doses reduced perceived fatigue at 80% of VO2max (all P < 0.050, ES from 0.71 to 1.48). CONCLUSION The effect of caffeine to enhance fat oxidation during submaximal aerobic exercise is of similar magnitude with 3 and 6 mg of caffeine per kg of body mass. Thus, a dose of 3 mg of caffeine per kg of body mass would be sufficient to enhance fat utilisation as fuel during submaximal exercise.
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Affiliation(s)
- Jorge Gutiérrez-Hellín
- Faculty of Health Sciences, Universidad Francisco de Vitoria, Ctra. Pozuelo-Majadahonda KM 1.800, 28223, Pozuelo de Alarcón, Madrid, Spain
| | - Millán Aguilar-Navarro
- Faculty of Health Sciences, Universidad Francisco de Vitoria, Ctra. Pozuelo-Majadahonda KM 1.800, 28223, Pozuelo de Alarcón, Madrid, Spain.
| | - Carlos Ruiz-Moreno
- Excercise Physiology Laboratory, Camilo José Cela University, Madrid, Spain
| | - Alejandro Muñoz
- Faculty of Health Sciences, Universidad Francisco de Vitoria, Ctra. Pozuelo-Majadahonda KM 1.800, 28223, Pozuelo de Alarcón, Madrid, Spain
| | - David Varillas-Delgado
- Faculty of Health Sciences, Universidad Francisco de Vitoria, Ctra. Pozuelo-Majadahonda KM 1.800, 28223, Pozuelo de Alarcón, Madrid, Spain
| | | | - Juan Del Coso
- Centre for Sport Studies, Rey Juan Carlos University, Madrid, Spain
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Does the Time of Day Play a Role in the Acute Effect of p-Synephrine on Fat Oxidation Rate during Exercise in Women? A Randomized, Crossover and Double-Blind Study. Nutrients 2022; 14:nu14235030. [PMID: 36501060 PMCID: PMC9740920 DOI: 10.3390/nu14235030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 11/21/2022] [Accepted: 11/22/2022] [Indexed: 11/29/2022] Open
Abstract
p-Synephrine is deemed a safe and effective substance to increase fat utilization during exercise of low-to-moderate intensity in men but not in women. Additionally, the existence of a diurnal variation in substrate utilization has been documented during exercise with enhanced fat oxidation in the evening compared with early morning. However, it remains unknown whether there is an interaction between the effect of p-synephrine and the time of the day on fat oxidation during exercise. This study aimed to evaluate the effect of the acute ingestion of 3 milligram of p-synephrine per kilogram of body mass (mg/kg) on fat oxidation during exercise of increasing intensity when the exercise is performed in the morning vs. the evening. Using a randomized, double-blind, placebo-controlled experimental design, 16 healthy and active women performed four identical exercise trials after the ingestion of 3 mg/kg of p-synephrine and 3 mg/kg of a placebo (cellulose) both in the morning (8-10 am) and in the evening (5-7 pm). In the exercise trials, the substances were ingested 60 min before an incremental test on a cycle ergometer with 3 min stages at workloads from 30 to 80% of maximal oxygen uptake (VO2max). Substrate oxidation rates were measured by indirect calorimetry. In each trial, the maximum rate of fat oxidation (MFO) and the intensity that elicited MFO (Fatmax) were measured. A two-way analysis of variance (time-of-the day × substance) was used to detect differences among the trials. With the placebo, MFO was 0.25 ± 0.11 g/min in the morning and 0.24 ± 0.07 g/min in the evening. With p-synephrine, MFO was 0.26 ± 0.09 g/min in the morning and 0.21 ± 0.07 g/min in the evening. There was no main effect of substance (p = 0.349), time of day (p = 0.186) and the substance × time of day (p = 0.365) on MFO. Additionally, Fatmax was reached at a similar exercise intensity with the placebo (41.33 ± 8.34% VO2max in the morning and 44.38 ± 7.37% VO2max in the evening) and with p-synephrine (43.33 ± 7.24% VO2max in the morning and 45.00 ± 7.43% VO2max in the evening), irrespective of the time of day with no main effect of substance (p = 0.633), time of day (p = 0.191), or interaction (p = 0.580). In summary, the acute intake of 3 mg/kg of p-synephrine before exercise did not increase MFO and Fatmax, independently of the time of day, in female athletes. This indicates that the time of day is not a factor explaining the lack of effectiveness of this substance to enhance fat oxidation during aerobic exercise in women.
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Van Schaik J, Burghard M, Lequin MH, van Maren EA, van Dijk AM, Takken T, Rehorst-Kleinlugtenbelt LB, Bakker B, Meijer L, Hoving EW, Fiocco M, Schouten-van Meeteren AYN, Tissing WJE, van Santen HM. Resting energy expenditure in children at risk of hypothalamic dysfunction. Endocr Connect 2022; 11:EC-22-0276. [PMID: 35904233 PMCID: PMC9346331 DOI: 10.1530/ec-22-0276] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 06/27/2022] [Indexed: 12/27/2022]
Abstract
OBJECTIVE Children with suprasellar brain damage are at risk of hypothalamic dysfunction (HD). HD may lead to decreased resting energy expenditure (REE). Decreased REE, however, is not present in all children with HD. Our aim was to assess which children suspect for HD have low REE, and its association with clinical severity of HD or radiological hypothalamic damage. PATIENTS AND METHODS A retrospective cohort study was performed. Measured REE (mREE) of children at risk of HD was compared to predicted REE (pREE). Low REE was defined as mREE <90% of predicted. The mREE/pREE quotient was associated to a clinical score for HD symptoms and to radiological hypothalamic damage. RESULTS In total, 67 children at risk of HD (96% brain tumor diagnosis) with a mean BMI SDS of +2.3 ± 1.0 were included. Of these, 45 (67.2%) had low mREE. Children with severe HD had a significant lower mean mREE/pREE quotient compared to children with no, mild, or moderate HD. Mean mREE/pREE quotient of children with posterior hypothalamic damage was significantly lower compared to children with no or anterior damage. Tumor progression or tumor recurrence, severe clinical HD, and panhypopituitarism with diabetes insipidus (DI) were significant risk factors for reduced REE. CONCLUSION REE may be lowered in children with hypothalamic damage and is associated to the degree of clinical HD. REE is, however, not lowered in all children suspect for HD. For children with mild or moderate clinical HD symptoms, REE measurements may be useful to distinguish between those who may benefit from obesity treatment that increases REE from those who would be better helped using other obesity interventions.
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Affiliation(s)
- J Van Schaik
- Division of Pediatric Endocrinology, Wilhelmina Children’s Hospital, University Medical Center Utrecht, Utrecht, The Netherlands
- Division of Pediatric Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
- Correspondence should be addressed to J Van Schaik:
| | - M Burghard
- Division of Pediatric Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
- Department of Exercise Physiology, Child Development & Exercise Center, Wilhelmina Children’s Hospital, University Medical Center Utrecht, Utrecht, The Netherlands
| | - M H Lequin
- Division of Pediatric Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
- Department of Radiology, Wilhelmina Children’s Hospital, University Medical Center Utrecht, Utrecht, The Netherlands
| | - E A van Maren
- Division of Pediatric Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
- Department of Radiology, Wilhelmina Children’s Hospital, University Medical Center Utrecht, Utrecht, The Netherlands
| | - A M van Dijk
- Department of Dietetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - T Takken
- Division of Pediatric Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
- Department of Exercise Physiology, Child Development & Exercise Center, Wilhelmina Children’s Hospital, University Medical Center Utrecht, Utrecht, The Netherlands
| | | | - B Bakker
- Division of Pediatric Endocrinology, Wilhelmina Children’s Hospital, University Medical Center Utrecht, Utrecht, The Netherlands
- Division of Pediatric Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
| | - L Meijer
- Division of Pediatric Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
| | - E W Hoving
- Division of Neurosurgery, Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
| | - M Fiocco
- Division of Pediatric Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
- Institute of Mathematics, Leiden University, Leiden, The Netherlands
| | | | - W J E Tissing
- Division of Pediatric Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
- Division of Pediatric Oncology, University Medical Centre Groningen, Groningen, The Netherlands
| | - H M van Santen
- Division of Pediatric Endocrinology, Wilhelmina Children’s Hospital, University Medical Center Utrecht, Utrecht, The Netherlands
- Division of Pediatric Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
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