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Goldstein ER, Stout JR, Wells AJ, Antonio J, Vasenina E, Fukuda DH. Carbohydrate-Protein drink is effective for restoring endurance capacity in masters class athletes after a two-Hour recovery. J Int Soc Sports Nutr 2023; 20:2178858. [PMID: 36843067 PMCID: PMC9970201 DOI: 10.1080/15502783.2023.2178858] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023] Open
Abstract
BACKGROUND Carbohydrate (CHO) and carbohydrate-protein co-ingestion (CHO-P) have been shown to be equally effective for enhancing glycogen resynthesis and subsequent same-day performance when CHO intake is suboptimal (≤0.8 g/kg). Few studies have specifically examined the effect of isocaloric CHO vs CHO-P consumption on subsequent high-intensity aerobic performance with limited time to recover (≤2 hours) in masters class endurance athletes. METHODS This was a randomized, double-blind between-subject design. Twenty-two male masters class endurance athletes (age 49.1 ± 6.9 years; height 175.8 ± 4.8 cm; body mass 80.7 ± 8.6 kg; body fat (%) 19.1 ± 5.8; VO2peak 48.6 ± 6.7 ml·kg·min-1) were assigned to consume one of three beverages during a 2-hour recovery period: Placebo (PLA; electrolytes and water), CHO (1.2 g/kg bm), or CHO-P (0.8 g/kg bm CHO + 0.4 g/kg bm PRO). All beverages were standardized to one liter (~32 oz.) of total fluid volume regardless of the treatment group. During Visit #1, participants completed graded exercise testing on a cycle ergometer to determine VO2peak and peak power output (PPO, watts). Visit #2 consisted of familiarization with the high-intensity protocol including 5 × 4 min intervals at 70-80% of PPO with 2 min of active recovery at 50 W, followed by a time to exhaustion (TTE) test at 90% PPO. During Visit#3, the same high-intensity interval protocol with TTE was conducted pre-and post-beverage consumption. RESULTS A one-way ANCOVA indicated a significant difference among the group means for the posttest TTE (F2,18 = 6.702, p = .007, ƞ2 = .427) values after adjusting for the pretest differences. TTE performance in the second exercise bout improved for the CHO (295.48 ± 24.90) and CHO-P (255.08 ± 25.07 sec) groups. The water and electrolyte solution was not effective in restoring TTE performance in the PLA group (171.13 ± 23.71 sec). CONCLUSIONS Both CHO and CHO-P effectively promoted an increase in TTE performance with limited time to recover in this sample of masters class endurance athletes. Water and electrolytes alone were not effective for restoring endurance capacity during the second bout of exhaustive exercise.
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Affiliation(s)
- Erica R. Goldstein
- Department of Health Sciences, Stetson University, Deland, Florida, USA,CONTACT Erica R. Goldstein Department of Health Sciences, Stetson University, Brown Hall 218, Deland, FL32723, USA
| | - Jeffrey R. Stout
- Physiology of Work and Exercise Response (POWER) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, Orlando, Florida, USA
| | - Adam J. Wells
- Exercise Physiology Intervention and Collaboration (EPIC) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, Orlando, Florida, USA
| | - Jose Antonio
- Department of Health and Human Performance, Fight Science Laboratory, Nova Southeastern University, Davie, FL, USA
| | - Ecaterina Vasenina
- Physiology of Work and Exercise Response (POWER) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, Orlando, Florida, USA
| | - David H. Fukuda
- Physiology of Work and Exercise Response (POWER) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, Orlando, Florida, USA
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Jagim AR, Harty PS, Tinsley GM, Kerksick CM, Gonzalez AM, Kreider RB, Arent SM, Jager R, Smith-Ryan AE, Stout JR, Campbell BI, VanDusseldorp T, Antonio J. International society of sports nutrition position stand: energy drinks and energy shots. J Int Soc Sports Nutr 2023; 20:2171314. [PMID: 36862943 PMCID: PMC9987737 DOI: 10.1080/15502783.2023.2171314] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 01/18/2023] [Indexed: 03/04/2023] Open
Abstract
Position Statement: The International Society of Sports Nutrition (ISSN) bases the following position stand on a critical analysis of the literature regarding the effects of energy drink (ED) or energy shot (ES) consumption on acute exercise performance, metabolism, and cognition, along with synergistic exercise-related performance outcomes and training adaptations. The following 13 points constitute the consensus of the Society and have been approved by the Research Committee of the Society: Energy drinks (ED) commonly contain caffeine, taurine, ginseng, guarana, carnitine, choline, B vitamins (vitamins B1, B2, B3, B5, B6, B9, and B12), vitamin C, vitamin A (beta carotene), vitamin D, electrolytes (sodium, potassium, magnesium, and calcium), sugars (nutritive and non-nutritive sweeteners), tyrosine, and L-theanine, with prevalence for each ingredient ranging from 1.3 to 100%. Energy drinks can enhance acute aerobic exercise performance, largely influenced by the amount of caffeine (> 200 mg or >3 mg∙kg bodyweight [BW-1]) in the beverage. Although ED and ES contain several nutrients that are purported to affect mental and/or physical performance, the primary ergogenic nutrients in most ED and ES based on scientific evidence appear to be caffeine and/or the carbohydrate provision. The ergogenic value of caffeine on mental and physical performance has been well-established, but the potential additive benefits of other nutrients contained in ED and ES remains to be determined. Consuming ED and ES 10-60 minutes before exercise can improve mental focus, alertness, anaerobic performance, and/or endurance performance with doses >3 mg∙kg BW-1. Consuming ED and ES containing at least 3 mg∙kg BW-1 caffeine is most likely to benefit maximal lower-body power production. Consuming ED and ES can improve endurance, repeat sprint performance, and sport-specific tasks in the context of team sports. Many ED and ES contain numerous ingredients that either have not been studied or evaluated in combination with other nutrients contained in the ED or ES. For this reason, these products need to be studied to demonstrate efficacy of single- and multi-nutrient formulations for physical and cognitive performance as well as for safety. Limited evidence is available to suggest that consumption of low-calorie ED and ES during training and/or weight loss trials may provide ergogenic benefit and/or promote additional weight control, potentially through enhanced training capacity. However, ingestion of higher calorie ED may promote weight gain if the energy intake from consumption of ED is not carefully considered as part of the total daily energy intake. Individuals should consider the impact of regular coingestion of high glycemic index carbohydrates from ED and ES on metabolic health, blood glucose, and insulin levels. Adolescents (aged 12 through 18) should exercise caution and seek parental guidance when considering the consumption of ED and ES, particularly in excessive amounts (e.g. > 400 mg), as limited evidence is available regarding the safety of these products among this population. Additionally, ED and ES are not recommended for children (aged 2-12), those who are pregnant, trying to become pregnant, or breastfeeding and those who are sensitive to caffeine. Diabetics and individuals with preexisting cardiovascular, metabolic, hepatorenal, and/or neurologic disease who are taking medications that may be affected by high glycemic load foods, caffeine, and/or other stimulants should exercise caution and consult with their physician prior to consuming ED. The decision to consume ED or ES should be based upon the beverage's content of carbohydrate, caffeine, and other nutrients and a thorough understanding of the potential side effects. Indiscriminate use of ED or ES, especially if multiple servings per day are consumed or when consumed with other caffeinated beverages and/or foods, may lead to adverse effects. The purpose of this review is to provide an update to the position stand of the International Society of Sports Nutrition (ISSN) integrating current literature on ED and ES in exercise, sport, and medicine. The effects of consuming these beverages on acute exercise performance, metabolism, markers of clinical health, and cognition are addressed, as well as more chronic effects when evaluating ED/ES use with exercise-related training adaptions.
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Affiliation(s)
- Andrew R. Jagim
- Sports Medicine, Mayo Clinic Health System, La Crosse, WI, USA
- Exercise & Sport Science, University of Wisconsin – La Crosse, La Crosse, WI, USA
| | - Patrick S. Harty
- Exercise & Performance Nutrition Laboratory, Lindenwood University, St. Charles, MO, USA
| | - Grant M. Tinsley
- Energy Balance and Body Composition Laboratory, Department of Kinesiology & Sport Management, Texas Tech University, Lubbock, TX, USA
| | - Chad M. Kerksick
- Sports Medicine, Mayo Clinic Health System, La Crosse, WI, USA
- Exercise & Performance Nutrition Laboratory, Lindenwood University, St. Charles, MO, USA
| | - Adam M. Gonzalez
- Department of Allied Health and Kinesiology, Hofstra University, Hempstead, NY, USA
| | - Richard B. Kreider
- Exercise & Sport Nutrition Lab, Department of Kinesiology and Sport Management, Texas A&M University, College Station, TX, USA
| | - Shawn M Arent
- Department of Exercise Science, Arnold School of Public Health, University of South Carolina, Columbia, SC, USA
| | | | - Abbie E. Smith-Ryan
- Applied Physiology Laboratory, Department of Exercise & Sport Science, University of North Carolina, Chapel Hill, NC, USA
| | - Jeffrey R. Stout
- School of Kinesiology and Rehabilitation Science, University of Central Florida, Orlando, FL, USA
| | - Bill I. Campbell
- Performance & Physique Enhancement Laboratory, University of South Florida, Tampa, FL, USA
| | - Trisha VanDusseldorp
- Bonafede Health, LLC, JDS Therapeutics, Harrison, NY, USA
- Department of Health and Exercise Sciences, Jacksonville University, Jacksonville, FL, USA
| | - Jose Antonio
- Department of Health and Human Performance, Nova Southeastern University, Davie, FL, USA
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Zheng J, Zhu X, Xu G, Wang X, Cao M, Zhu S, Huang R, Zhou Y. Relationship between caffeine intake and thyroid function: results from NHANES 2007-2012. Nutr J 2023; 22:36. [PMID: 37491267 PMCID: PMC10369722 DOI: 10.1186/s12937-023-00866-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 07/19/2023] [Indexed: 07/27/2023] Open
Abstract
BACKGROUND Moderate caffeine intake decreases the risk of metabolic disorders and all-cause mortality, and the mechanism may be related to its ergogenic actions. Thyroid hormones are vital in metabolic homeostasis; however, their association with caffeine intake has rarely been explored. OBJECTIVE To investigate the association between caffeine intake and thyroid function. METHODS We collected data on demographic background, medical conditions, dietary intake, and thyroid function from the National Health and Nutrition Examination Survey (NHANES) 2007-2012. Subgroups were classified using two-step cluster analysis, with sex, age, body mass index (BMI), hyperglycemia, hypertension, and cardio-cerebral vascular disease (CVD) being used for clustering. Restrictive cubic spline analysis was employed to investigate potential nonlinear correlations, and multivariable linear regression was used to evaluate the association between caffeine consumption and thyroid function. RESULTS A total of 2,582 participants were included, and three subgroups with different metabolic features were clustered. In the most metabolically unhealthy group, with the oldest age, highest BMI, and more cases of hypertension, hyperglycemia, and CVD, there was a nonlinear relationship between caffeine intake and serum thyroid stimulating hormone (TSH) level. After adjusting for age, sex, race, drinking, smoking, medical conditions, and micronutrient and macronutrient intake, caffeine intake of less than 9.97 mg/d was positively associated with serum TSH (p = 0.035, standardized β = 0.155); however, moderate caffeine consumption (9.97-264.97 mg/d) indicated a negative association (p = 0.001, standardized β = - 0.152). CONCLUSIONS Caffeine consumption had a nonlinear relationship with serum TSH in people with metabolic disorders, and moderate caffeine intake (9.97 ~ 264.97 mg/d) was positively associated with serum TSH.
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Affiliation(s)
- Jiaping Zheng
- Department of Rehabilitation Medicine, School of Health, Fujian Medical University, Fuzhou, China
| | - Xinyan Zhu
- Department of Clinical Pharmacy and Pharmacy Administration, School of Pharmacy, Fujian Medical University, Fuzhou, China
| | - Guiqing Xu
- Department of Rehabilitation Medicine, School of Health, Fujian Medical University, Fuzhou, China
| | - Xingchen Wang
- Department of Rehabilitation Medicine, School of Health, Fujian Medical University, Fuzhou, China
| | - Mengyang Cao
- Department of Rehabilitation Medicine, School of Health, Fujian Medical University, Fuzhou, China
| | - Shusen Zhu
- Department of Intelligent Medical Engineering, School of Medical Imaging, Fujian Medical University, Fuzhou, China
| | - Rui Huang
- Fujian Normal University Hospital, Fuzhou, China
| | - Yu Zhou
- Department of Clinical Pharmacy and Pharmacy Administration, School of Pharmacy, Fujian Medical University, Fuzhou, China.
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Shoemaker ME, Gillen ZM, Fukuda DH, Cramer JT. Metabolic Flexibility and Inflexibility: Pathology Underlying Metabolism Dysfunction. J Clin Med 2023; 12:4453. [PMID: 37445488 DOI: 10.3390/jcm12134453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Accepted: 06/29/2023] [Indexed: 07/15/2023] Open
Abstract
Metabolic flexibility can be defined as the ability of the skeletal muscle to adjust its utilization of substrate pathways [...].
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Affiliation(s)
- Marni E Shoemaker
- School of Health and Consumer Sciences, South Dakota State University, Brookings, SD 57007, USA
| | - Zachary M Gillen
- Department of Kinesiology, Mississippi State University, 180 Magruder Street, Mississippi State, MS 39762, USA
| | - David H Fukuda
- School of Kinesiology and Rehabilitation Sciences, University of Central Florida, Orlando, FL 32816, USA
| | - Joel T Cramer
- College of Health Professions and Sciences, University of Central Florida, Orlando, FL 32816, USA
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Braschi A, Lo Presti R, Abrignani MG, Abrignani V, Traina M. Effects of green tea catechins and exercise training on body composition parameters. Int J Food Sci Nutr 2023; 74:3-21. [PMID: 36446085 DOI: 10.1080/09637486.2022.2150152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The impact of phytochemicals, as green tea catechins, on body composition measures has become a relevant topic as ongoing epidemiological evidence suggests their potential role in weight loss. Although catechins have been shown to modulate fat and energy metabolism, clinical effects of green tea consumption still remain controversial. Given the role played by physical exercise in weight management, it is important to determine whether the association of catechins and exercise is able to improve outcomes over and above the beneficial effects of exercise alone. Considering that scientific findings on this topic are not entirely consistent, aim of the present review was to assess the current scientific literature regarding the interplay between green tea catechins and exercise in overweight and obese populations. In particular, it was evaluated whether the addition of green tea supplementation to exercise training was able to further improve the exercise-induced changes in body composition parameters.
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Affiliation(s)
- Annabella Braschi
- Department of Psychology, Educational Science and Human Movement, University of Palermo, Palermo, Italy
| | - Rosalia Lo Presti
- Department of Psychology, Educational Science and Human Movement, University of Palermo, Palermo, Italy
| | - Maurizio Giuseppe Abrignani
- Operative Unit of Cardiology, Department of Medicine, S.Antonio Abate Hospital of Trapani, ASP Trapani, Trapani, Italy
| | - Vincenzo Abrignani
- Operative Unit of Internal Medicine with Stroke Care, Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties (ProMISE) "G. D'Alessandro", University of Palermo, Palermo, Italy
| | - Marcello Traina
- Department of Psychology, Educational Science and Human Movement, University of Palermo, Palermo, Italy
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Leão TK, Ribeiro DL, Machado ART, Costa TR, Sampaio SV, Antunes LMG. Synephrine and caffeine combination promotes cytotoxicity, DNA damage and transcriptional modulation of apoptosis-related genes in human HepG2 cells. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2021; 868-869:503375. [PMID: 34454690 DOI: 10.1016/j.mrgentox.2021.503375] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 07/04/2021] [Accepted: 07/07/2021] [Indexed: 11/19/2022]
Abstract
The abusive consumption of thermogenic supplements occurs worldwide and deserves special attention due to their use to stimulate weight loss and prevent obesity. Thermogenic formulations usually contain Synephrine (SN) and Caffeine (CAF), stimulating compounds extracted from natural sources, but no genetic toxicology studies have predicted this hazardous combination potential. This study examined the toxicogenomic responses induced by SN and CAF, either alone or in combination, in the human hepatic cell line HepG2 in vitro. SN (0.03-30 μM) and CAF (0.6-600 μM) alone did neither decrease cell viability nor induce DNA damage, as assessed using the MTT and comet assays, respectively. SN (3 μM) and CAF (30-600 μM) were combined at concentrations similar to those found in commercial dietary supplements. SN/CAF at 3:90 and 3:600 μM ratios significantly decreased cell viability and increased DNA damage levels in HepG2 cells. CAF (600 μM) and the SN/CAF association at 3:60, 3:90, and 3:600 μM ratios promoted cell death by apoptosis, as demonstrated by flow cytometry. Similar results were observed in gene expression (RT-qPCR): SN/CAF up-regulated the expression of apoptosis- (BCL-2 and CASP9) and DNA repair-related (XPC) genes. SN/CAF at 3:90 μM also downregulated the expression of cell cycle control (CDKN1A) genes. In conclusion, the SN/CAF combination reduces cell viability by inducing apoptosis, damages DNA, and modulates the transcriptional expression of apoptosis-, cell cycle-, and DNA repair-related genes in human hepatic (HepG2) cells in vitro. These effects can be worrisome to consumers of thermogenic supplements.
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Affiliation(s)
- Tainá Keiller Leão
- Department of Clinical Analyses, Toxicology and Food Sciences, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Avenida do Café, s/n°, CEP: 14040-903, Ribeirão Preto, São Paulo, Brazil
| | - Diego Luís Ribeiro
- Department of Genetics, Ribeirão Preto Medical School, University of São Paulo, Avenida dos Bandeirantes, 3900, CEP: 14040-901, Ribeirão Preto, São Paulo, Brazil
| | - Ana Rita Thomazela Machado
- Department of Clinical Analyses, Toxicology and Food Sciences, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Avenida do Café, s/n°, CEP: 14040-903, Ribeirão Preto, São Paulo, Brazil
| | - Tássia Rafaela Costa
- Department of Clinical Analyses, Toxicology and Food Sciences, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Avenida do Café, s/n°, CEP: 14040-903, Ribeirão Preto, São Paulo, Brazil
| | - Suely Vilela Sampaio
- Department of Clinical Analyses, Toxicology and Food Sciences, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Avenida do Café, s/n°, CEP: 14040-903, Ribeirão Preto, São Paulo, Brazil
| | - Lusânia Maria Greggi Antunes
- Department of Clinical Analyses, Toxicology and Food Sciences, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Avenida do Café, s/n°, CEP: 14040-903, Ribeirão Preto, São Paulo, Brazil.
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Clark NW, Panissa VL, Herring CH, Goldstein ER, Stout JR, Wells AJ, Fukuda DH. Energy Drinks May Not Impact Excess Postexercise Oxygen Consumption: Considerations for Pre-exercise Test Recommendations. J Caffeine Adenosine Res 2021. [DOI: 10.1089/caff.2021.0001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Nicolas W. Clark
- Physiology of Work and Exercise Response (POWER) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, Orlando, Florida, USA
- Division of Kinesiology, School of Kinesiology and Physical Therapy, University of Central Florida, Orlando, Florida, USA
| | - Valéria L.G. Panissa
- Department of Sport, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil
| | - Chad H. Herring
- Physiology of Work and Exercise Response (POWER) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, Orlando, Florida, USA
- Division of Kinesiology, School of Kinesiology and Physical Therapy, University of Central Florida, Orlando, Florida, USA
| | - Erica R. Goldstein
- Physiology of Work and Exercise Response (POWER) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, Orlando, Florida, USA
- Division of Kinesiology, School of Kinesiology and Physical Therapy, University of Central Florida, Orlando, Florida, USA
| | - Jeffrey R. Stout
- Physiology of Work and Exercise Response (POWER) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, Orlando, Florida, USA
- Division of Kinesiology, School of Kinesiology and Physical Therapy, University of Central Florida, Orlando, Florida, USA
| | - Adam J. Wells
- Division of Kinesiology, School of Kinesiology and Physical Therapy, University of Central Florida, Orlando, Florida, USA
- Exercise Physiology Intervention and Collaboration (EPIC) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, Orlando, Florida, USA
| | - David H. Fukuda
- Physiology of Work and Exercise Response (POWER) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, Orlando, Florida, USA
- Division of Kinesiology, School of Kinesiology and Physical Therapy, University of Central Florida, Orlando, Florida, USA
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Collado-Mateo D, Lavín-Pérez AM, Merellano-Navarro E, Coso JD. Effect of Acute Caffeine Intake on the Fat Oxidation Rate during Exercise: A Systematic Review and Meta-Analysis. Nutrients 2020; 12:nu12123603. [PMID: 33255240 PMCID: PMC7760526 DOI: 10.3390/nu12123603] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 11/17/2020] [Accepted: 11/20/2020] [Indexed: 12/30/2022] Open
Abstract
A number of previous investigations have been designed to determine the effect of acute caffeine intake on the rate of fat oxidation during exercise. However, these investigations have shown contradictory results due to the differences in the exercise protocols used or the co-ingestion of caffeine with other substances. Hence, to date, there is no consensus about the effect of caffeine on fat oxidation during exercise. The purpose of this study was to conduct a systematic review followed by a meta-analysis to establish the effect of acute intake of caffeine (ranging from 2 to 7 mg/kg of body mass) on the rate of fat oxidation during exercise. A total of 19 studies published between 1978 and 2020 were included, all of which employed crossover experimental designs in which the ingestion of caffeine was compared to a placebo. Studies were selected if the exercise intensity was consistent in the caffeine and placebo trials and if these were preceded by a fasting protocol. A subsequent meta-analysis was performed using the random effects model to calculate the standardized mean difference (SMD). The meta-analysis revealed that caffeine significantly (p = 0.008) increased the fat oxidation rate (SMD = 0.73; 95% CI = 0.19 to 1.27). This increment was consistent with a significant (p = 0.04) reduction of the respiratory exchange ratio (SMD = -0.33; 95% CI = -0.65 to -0.01) and a significant (p = 0.049) increase in the oxygen uptake (SMD = 0.23; 95% CI = 0.01 to 0.44). The results also showed that there was a dose-response effect of caffeine on the fat oxidation rate, indicating that more than 3.0 mg/kg is necessary to obtain a statistically significant effect of this stimulant on fat oxidation during exercise. Additionally, the ability of caffeine to enhance fat oxidation during exercise was higher in sedentary or untrained individuals than in trained and recreational athletes. In conclusion, pre-exercise intake of a moderate dose of caffeine may effectively increase fat utilization during aerobic exercise of submaximal intensity performed after a fasting period. However, the fitness level of the participant may modulate the magnitude of the effect of caffeine on fat oxidation during exercise.
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Affiliation(s)
- Daniel Collado-Mateo
- Centre for Sport Studies, Rey Juan Carlos University, 28043 Fuenlabrada, Spain; (D.C.-M.); (A.M.L.-P.)
| | - Ana Myriam Lavín-Pérez
- Centre for Sport Studies, Rey Juan Carlos University, 28043 Fuenlabrada, Spain; (D.C.-M.); (A.M.L.-P.)
- GO fit LAB, Ingesport, 28003 Madrid, Spain
| | | | - Juan Del Coso
- Centre for Sport Studies, Rey Juan Carlos University, 28043 Fuenlabrada, Spain; (D.C.-M.); (A.M.L.-P.)
- Correspondence:
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Clark NW, Herring CH, Goldstein ER, Stout JR, Wells AJ, Fukuda DH. Heart Rate Variability Behavior during Exercise and Short-Term Recovery Following Energy Drink Consumption in Men and Women. Nutrients 2020; 12:nu12082372. [PMID: 32784372 PMCID: PMC7468719 DOI: 10.3390/nu12082372] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 08/02/2020] [Accepted: 08/05/2020] [Indexed: 12/27/2022] Open
Abstract
This study examined the cardiac autonomic responses, as measured by heart rate variability (HRV), during cycling exercise and short-term rest after energy drink consumption. Seventeen participants (seven males and 10 females; age: 22.8 ± 3.5 years; BMI: 24.3 ± 3.3 kg/m2) completed this double-blind, placebo-controlled, counterbalanced crossover design study. Participants received an energy drink formula containing 140 mg of caffeine and a placebo in a randomized order before completing a 10-min steady-state warm up (WUP) and a graded exercise test to exhaustion (GXT) followed by a 15-min short-term rest (STR) period. Heartbeat intervals were recorded using a heart rate monitor. Data were divided into WUP, GXT, and STR phases, and HRV parameters were averaged within each phase. Additionally, root mean square of the standard deviation of R–R intervals (RMSSD) during GXT was analyzed to determine the HRV threshold. Separate two-way (sex (male vs. female) x drink (energy drink vs. placebo)) repeated measures ANOVA were utilized. Significant increases in high frequency (HF) and RMSSD were shown during WUP after energy drink consumption, while interactions between drink and sex were observed for HRV threshold parameters (initial RMSSD and rate of RMSSD decline). No significant differences were noted during STR. Energy drink consumption may influence cardiac autonomic responses during low-intensity exercise, and sex-based differences in response to graded exercise to exhaustion may exist.
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Affiliation(s)
- Nicolas W. Clark
- Physiology of Work and Exercise Response (POWER) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, 12494 University Blvd., Orlando, FL 32816, USA; (N.W.C.); (C.H.H.); (E.R.G.); (J.R.S.)
- Division of Kinesiology, School of Kinesiology and Physical Therapy, University of Central Florida, 12494 University Blvd., Orlando, FL 32816, USA;
| | - Chad H. Herring
- Physiology of Work and Exercise Response (POWER) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, 12494 University Blvd., Orlando, FL 32816, USA; (N.W.C.); (C.H.H.); (E.R.G.); (J.R.S.)
- Division of Kinesiology, School of Kinesiology and Physical Therapy, University of Central Florida, 12494 University Blvd., Orlando, FL 32816, USA;
| | - Erica R. Goldstein
- Physiology of Work and Exercise Response (POWER) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, 12494 University Blvd., Orlando, FL 32816, USA; (N.W.C.); (C.H.H.); (E.R.G.); (J.R.S.)
- Division of Kinesiology, School of Kinesiology and Physical Therapy, University of Central Florida, 12494 University Blvd., Orlando, FL 32816, USA;
| | - Jeffrey R. Stout
- Physiology of Work and Exercise Response (POWER) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, 12494 University Blvd., Orlando, FL 32816, USA; (N.W.C.); (C.H.H.); (E.R.G.); (J.R.S.)
- Division of Kinesiology, School of Kinesiology and Physical Therapy, University of Central Florida, 12494 University Blvd., Orlando, FL 32816, USA;
| | - Adam J. Wells
- Division of Kinesiology, School of Kinesiology and Physical Therapy, University of Central Florida, 12494 University Blvd., Orlando, FL 32816, USA;
- Exercise Physiology Intervention and Collaboration (EPIC) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, 12494 University Blvd., Orlando, FL 32816, USA
| | - David H. Fukuda
- Physiology of Work and Exercise Response (POWER) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, 12494 University Blvd., Orlando, FL 32816, USA; (N.W.C.); (C.H.H.); (E.R.G.); (J.R.S.)
- Division of Kinesiology, School of Kinesiology and Physical Therapy, University of Central Florida, 12494 University Blvd., Orlando, FL 32816, USA;
- Correspondence: ; Tel.: +1-407-823-0442
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