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Dalle S, Koppo K, Hespel P. Sodium bicarbonate improves sprint performance in endurance cycling. J Sci Med Sport 2020; 24:301-306. [PMID: 34756350 DOI: 10.1016/j.jsams.2020.09.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 08/14/2020] [Accepted: 09/12/2020] [Indexed: 11/29/2022]
Abstract
OBJECTIVES Oral sodium bicarbonate intake (NaHCO3) may improve performance in short maximal exercise by inducing metabolic alkalosis. However, it remains unknown whether NaHCO3 also enhances all-out performance at the end of an endurance competition. Therefore, the present study investigated the effect of stacked NaHCO3 loading on sprint performance following a 3-h simulated cycling race. DESIGN Double-blind randomized placebo-controlled cross-over study. METHODS Eleven trained male cyclists (22.3 (18.3-25.3) year; 73.0 (61.5-88) kg; VO2max: 63.7 (57-72) mlkg-1min-1) ingested either 300mgkg-1 body weight NaHCO3 (BIC) or NaCl (PL). NaHCO3 or NaCl was supplemented prior to (150mgkg-1) and during (150mgkg-1) a 3-h simulated cycling race with a 90-s all-out sprint (90S) at the end. Capillary blood samples were collected for determination of blood pH, lactate and HCO3- concentrations. Analysis of variance (lactate, pH, HCO3-) and paired t-test (power) were applied to compare variables across condition (and time). RESULTS NaHCO3 intake improved mean power during 90S by ∼3% (541±59W vs. 524±57W in PL, p=0.047, Cohen's D=0.28, medium). Peak blood lactate concentration and heart rate at the end of 90S were higher (p<0.05) in BIC (16.2±4.1mmoll1, 184±7bpm) than in PL (12.4±4.2mmoll-1, 181±5bpm). NaHCO3 ingestion increased blood [HCO3-] (31.5±1.3 vs. 24.4±1.5mmoll-1 in PL, p<0.001) and blood pH (7.50±0.01 vs. 7.41±0.03 in PL, p<0.05) prior to 90S. CONCLUSIONS NaHCO3 supplementation prior and during endurance exercise improves short all-out exercise performance at the end of the event. Therefore, sodium bicarbonate intake can be applied as a strategy to increase success rate in endurance competitions.
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Affiliation(s)
- Sebastiaan Dalle
- Exercise Physiology Research Group, Department of Movement Sciences, KU Leuven, Belgium
| | - Katrien Koppo
- Exercise Physiology Research Group, Department of Movement Sciences, KU Leuven, Belgium
| | - Peter Hespel
- Exercise Physiology Research Group, Department of Movement Sciences, KU Leuven, Belgium; Bakala Academy Athletic Performance Center, KU Leuven, Belgium.
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Dos Santos Quaresma MVL, Guazzelli Marques C, Nakamoto FP. Effects of diet interventions, dietary supplements, and performance-enhancing substances on the performance of CrossFit-trained individuals: A systematic review of clinical studies. Nutrition 2020; 82:110994. [PMID: 33051114 DOI: 10.1016/j.nut.2020.110994] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 08/03/2020] [Accepted: 08/08/2020] [Indexed: 12/14/2022]
Abstract
CrossFit (CF) is characterized as a constantly varied, high-intensity, functional movement training program, performed with little or no rest between bouts, combining strength and endurance exercises, such as running, cycling, rowing, Olympic weightlifting, power weightlifting, and gymnastic-type exercises. Several nutritional strategies are used to improve sports performance of CF practitioners; however, most of them are empirical and lack scientific evidence. Thus, the aim of this review was to determine the effects of diet intervention, dietary supplements, and performance-enhancing substances on exercise-performance parameters of CF practitioners. MEDLINE/PubMed, Web of Science, LILACS, SciELO, and Scopus databases were searched using specific Medical Subject Headings and keywords for clinical studies that enrolled CF athletes in an intervention using diet, dietary supplements, or performance-enhancing substances. Athletic performance was considered as the primary outcome. No other filters were applied. Including grey literature search, 219 studies were identified; however only 14 studies met the eligibility criteria. Two studies evaluated the effects of caffeine supplementation on exercise performance; five studies evaluated high- or low-carbohydrate effects on performance and other parameters. One study verified the effects of multi-ingredient supplementation on CF-specific performance and body composition. One study compared the intake of protein supplements on performance and body composition. Two studies assessed the effect of green tea and (-)-epicatechin on performance and other parameters. One study evaluated the effects of nitrate supplementation on exercise performance. One study investigated the effect of betaine supplementation on body composition and muscle performance. Finally, one study examined the effects of sodium bicarbonate (SB) ingestion on exercise performance and aerobic capacity. Only SB supplementation improved CF performance. These outcomes may have been obtained due to methodological limitations such as small sample size, lack of control over influencing variables, short period of exercise intervention. Despite the popularity and growing evidence about CF, little is known about the relationship between performance-enhancing substances or dietary interventions and CF performance. Given the lack of scientific evidence, new studies with potential ergogenic supplements, a better methodological model, and practical application are required.
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Rothschild JA, Bishop DJ. Effects of Dietary Supplements on Adaptations to Endurance Training. Sports Med 2020; 50:25-53. [PMID: 31531769 DOI: 10.1007/s40279-019-01185-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Endurance training leads to a variety of adaptations at the cellular and systemic levels that serve to minimise disruptions in whole-body homeostasis caused by exercise. These adaptations are differentially affected by training volume, training intensity, and training status, as well as by nutritional choices that can enhance or impair the response to training. A variety of supplements have been studied in the context of acute performance enhancement, but the effects of continued supplementation concurrent to endurance training programs are less well characterised. For example, supplements such as sodium bicarbonate and beta-alanine can improve endurance performance and possibly training adaptations during endurance training by affecting buffering capacity and/or allowing an increased training intensity, while antioxidants such as vitamin C and vitamin E may impair training adaptations by blunting cellular signalling but appear to have little effect on performance outcomes. Additionally, limited data suggest the potential for dietary nitrate (in the form of beetroot juice), creatine, and possibly caffeine, to further enhance endurance training adaptation. Therefore, the objective of this review is to examine the impact of dietary supplements on metabolic and physiological adaptations to endurance training.
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Affiliation(s)
- Jeffrey A Rothschild
- Sports Performance Research Institute New Zealand (SPRINZ), Auckland University of Technology, Auckland, New Zealand. .,TriFit Performance Center, Santa Monica, CA, USA.
| | - David J Bishop
- Institute for Health and Sport, Victoria University, Melbourne, VIC, Australia.,School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia
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McKay AKA, Peeling P, Binnie MJ, Goods PSR, Sim M, Cross R, Siegler J. Topical Sodium Bicarbonate: No Improvement in Blood Buffering Capacity or Exercise Performance. Int J Sports Physiol Perform 2020; 15:1005-1011. [PMID: 32575069 DOI: 10.1123/ijspp.2019-0345] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Revised: 10/22/2019] [Accepted: 10/24/2019] [Indexed: 10/27/2023]
Abstract
PURPOSE To assess the efficacy of a topical sodium bicarbonate (0.3 g/kg body weight NaHCO3) application (PR lotion; Amp Human) on blood buffering capacity and performance in recreationally active participants (study A) and moderately trained athletes (study B). METHODS In Study A, 10 participants completed 2 experimental trials: oral NaHCO3 (0.3 g/kg body weight + placebo lotion) or PR lotion (0.9036 g/kg body weight + oral placebo) applied 90 minutes prior to a cycling task to exhaustion (30-s sprints at 120% peak power output with 30-s rest). Capillary blood was collected and analyzed for pH, bicarbonate, and lactate every 10 minutes throughout the 90-minute loading period and postexercise at 5, 10, and 15 minutes. In Study B, 10 cyclists/triathletes completed 2 experimental trials, applying either PR or placebo lotion 30 minutes prior to a cycling performance task (3 × 30-s maximal sprints with 90-s recovery). Capillary blood samples were collected at baseline, preexercise, and postexercise and analyzed as per study A. RESULTS In Study A, pH and bicarbonate were significantly elevated from baseline after 10 minutes in the oral NaHCO3 condition and throughout recovery compared with no elevation in the PR lotion condition (P < .001). No differences in cycling time occurred between PR lotion (349 [119] s) and oral NaHCO3 (363 [80] s; P = .697). In Study B, no differences in blood parameters, mean power (P = .108), or peak power (P = .448) were observed between conditions. CONCLUSIONS PR lotion was ineffective in altering blood buffering capacity or enhancing performance in either trained or untrained individuals.
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Baranauskas M, Jablonskienė V, Abaravičius JA, Samsonienė L, Stukas R. Dietary Acid-Base Balance in High-Performance Athletes. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:E5332. [PMID: 32722186 PMCID: PMC7432059 DOI: 10.3390/ijerph17155332] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 07/21/2020] [Accepted: 07/22/2020] [Indexed: 01/06/2023]
Abstract
Physical exercise leads to metabolic changes that affect the acid-base balance in skeletal muscles and other tissues. Nutrition is one of the factors that may influence the acid-base balance in the body. Keeping alkaline circumstances in the body is important not only for health and athletic performance in training but also during competition in many sport events. This is especially significant for athletes who practice in sport at the highest level of competition. The aim of the study was to determine the dietary acid-base balance in competitive Lithuanian high-performance athletes, and to evaluate the effect of actual diets of athletes on NEAP (net endogenous acid production), muscle mass and body mineral content during a four-year Olympic cycle. The research participants were 18.1 ± 3.3-year-old Lithuanian high performance athletes (n = 323). The actual diet was investigated using the 24 h recall dietary survey method. The measurements of body composition were performed using BIA (bioelectrical impedance analysis). The potential renal acid load of the diets of athletes (dietary PRAL) and NEAP were calculated. In 10.2% of athletes, NEAP exceeds 100 mEq · day-1 and is on average 126.1 ± 32.7 mEq · day-1. Higher NEAP in athletes is associated with lower muscle mass (β -1.2% of body weight, p < 0.001) but has no effect on the amount of minerals in the body (β 0.01% of body weight, p = 0.073). Overall, 25-30% of Lithuanian high-performance athletes use high-protein diets (2.0-4.8 g · kg-1 · day-1) leading to a dietary acid-base imbalance as well as an excessive production of endogenous acids in the body. Athletes are recommended to consume higher amounts of potassium and magnesium. An increase in calcium intake up to 1500 mg per day is recommended. In exceptional cases, periodised nutrition for athletes may involve diets complemented with bicarbonate and/or beta-alanine supplements.
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Affiliation(s)
- Marius Baranauskas
- Department of Physiology, Biochemistry, Microbiology and Laboratory Medicine of the Faculty of Medicine, Institute of Biomedical Sciences, Vilnius University, 01513 Vilnius, Lithuania; (V.J.); (J.A.A.)
| | - Valerija Jablonskienė
- Department of Physiology, Biochemistry, Microbiology and Laboratory Medicine of the Faculty of Medicine, Institute of Biomedical Sciences, Vilnius University, 01513 Vilnius, Lithuania; (V.J.); (J.A.A.)
| | - Jonas Algis Abaravičius
- Department of Physiology, Biochemistry, Microbiology and Laboratory Medicine of the Faculty of Medicine, Institute of Biomedical Sciences, Vilnius University, 01513 Vilnius, Lithuania; (V.J.); (J.A.A.)
| | - Laimutė Samsonienė
- Department of Rehabilitation, Physical and Sports Medicine, Institute of Health Sciences of the Faculty of Medicine, Vilnius University, 01513 Vilnius, Lithuania;
| | - Rimantas Stukas
- Department of Public Health, Institute of Health Sciences of the Faculty of Medicine, Vilnius University, 01513 Vilnius, Lithuania;
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Grgic J. Effects of Combining Caffeine and Sodium Bicarbonate on Exercise Performance: A Review with Suggestions for Future Research. J Diet Suppl 2020; 18:444-460. [DOI: 10.1080/19390211.2020.1783422] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Jozo Grgic
- Institute for Health and Sport (IHES), Victoria University, Melbourne, Australia
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57
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Cerullo G, Parimbelli M, Perna S, Pecoraro M, Liguori G, Negro M, D’Antona G. Sodium citrate supplementation: An updated revision and practical recommendations on exercise performance, hydration status, and potential risks. TRANSLATIONAL SPORTS MEDICINE 2020. [DOI: 10.1002/tsm2.174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Giuseppe Cerullo
- Department of Movement and Wellbeing Sciences University of Naples, Parthenope Naples Italy
| | | | - Simone Perna
- Department of Biology College of Science University of Bahrain Sakhir Bahrain
| | | | - Giorgio Liguori
- Department of Movement and Wellbeing Sciences University of Naples, Parthenope Naples Italy
| | - Massimo Negro
- CRIAMS‐Sport Medicine Centre University of Pavia Voghera Italy
| | - Giuseppe D’Antona
- CRIAMS‐Sport Medicine Centre University of Pavia Voghera Italy
- Department of Public Health, Experimental and Forensic Medicine University of Pavia Pavia Italy
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58
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Kalytczak MM, Barros BM, Battazza RA, Bocalini DS, Biasotto-Gonzalez DA, Figueira Junior AJ, Politti F. The Effect of Sodium Bicarbonate Supplementation on Electromyographic Muscle Activity in Healthy, Physically Active Individuals: A Systematic Review. J Diet Suppl 2020; 18:334-350. [PMID: 32449633 DOI: 10.1080/19390211.2020.1766633] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
AIM The aim of this systematic review was to investigate the effects of sodium bicarbonate supplementation on electromyographic (EMG) muscle activity in healthy, physically active individuals. METHODS A systematic review of cross-sectional studies, crossover studies and randomized controlled trials was performed to investigate the effects of sodium bicarbonate supplementation on EMG muscle activity in healthy, physically active individuals. Potentially eligible for the systematic review were identified through searches conducted in the PubMed/MEDLINE, Science Direct and Scopus, considering publications from January 1980 to August 2019. The terms used in the search were: sodium bicarbonate, NaHCO3, alkalosis, alkaloses, electromyography, surface electromyography, electromyographies, electromyogram and EMG. Two independent assessors extracted data from the selected articles. Bias analysis was conducted using the Cochrane Risk of Bias tool and methodological quality was appraised using a checklist created based on the guidelines of the Consolidated Standards of Reporting Trials and the International Society of Electrophysiology and Kinesiology. RESULTS A total of 67 studies were retrieved and seven were included in this review. Only two studies showed significant differences in muscle activity after sodium bicarbonate supplementation. The different EMG signal capturing, processing, and analysis methods used constitute an important limitation to the comparative analyses of the results reported in the studies selected for the present review. CONCLUSION The results found do not allow us to affirm whether EMG may or may not be a safe tool to assess the effects of sodium bicarbonate supplementation on muscle activity.
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Affiliation(s)
| | - Bruna Massaroto Barros
- Postgraduate Program in Rehabilitation Sciences, Nove de Julho University, São Paulo, Brazil
| | | | - Danilo Sales Bocalini
- Postgraduate Program in Physical Education, University Federal do Espírito Santo (EFES), Espírito Santo, Brazil
| | | | | | - Fabiano Politti
- Postgraduate Program in Rehabilitation Sciences, Nove de Julho University, São Paulo, Brazil
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59
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Durkalec-Michalski K, Nowaczyk PM, Adrian J, Kamińska J, Podgórski T. The influence of progressive-chronic and acute sodium bicarbonate supplementation on anaerobic power and specific performance in team sports: a randomized, double-blind, placebo-controlled crossover study. Nutr Metab (Lond) 2020; 17:38. [PMID: 32489393 PMCID: PMC7245907 DOI: 10.1186/s12986-020-00457-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 05/07/2020] [Indexed: 02/07/2023] Open
Abstract
Background The aims of this study were to verify the effect of progressive-chronic and acute sodium bicarbonate (SB) supplementation on the anaerobic capacity, blood acid-base balance, and discipline-specific performance in team sports disciplines. Methods Twenty-four trained male field hockey players completed a randomized, placebo-controlled, crossover trial of either progressive-chronic (increments from 0.05 up to 0.2 g/kg) or an acute one-off dose (0.2 g/kg) supplementation protocol. Before and after treatments, athletes completed an exercise protocol that comprised of a discipline-specific field performance test conducted between two separate Wingate anaerobic tests (WAnTs). Results Progressive-chronic SB supplementation improved anaerobic capacity in the first bout of WAnTs, as observed based on an increase in mean power (MP: 575 ± 71 vs. 602 ± 67 W, p = 0.005, ~ + 4.7%), peak power (PP: 749 ± 94 vs. 777 ± 96 W, p = 0.002, ~ + 3.7%), power carry threshold (PCT) at 97%PP (727 ± 91 vs. 753 ± 93 W, p = 0.002, ~ + 3.6%) and average power over PCT (739 ± 94 vs. 765 ± 95 W, p = 0.001, ~ + 3.5%). Acute SB supplementation had no effect on anaerobic capacity. However, an improvement in time during discipline-specific field performance test was observed after progressive-chronic (919 ± 42 vs. 912 ± 27 s, p = 0.05; ~ - 0.8%) and acute (939 ± 26 vs. 914 ± 22 s, p = 0.006, ~ 2.7%) SB supplementation. Acute SB supplementation also improved post-exercise parameters of acid-base balance (based on blood pH, bicarbonate concentration and base excess) compared to no supplementation or placebo. Conclusions Our study indicates that both chronic and acute SB supplementation positively supports discipline-specific performance among field hockey athletes. Moreover, the chronic protocol supported anaerobic power indices before the inset of exercise-induced fatigue but had no significant impact afterwards. However, only the acute protocol significantly affected the buffering capacity, which can be used to determine athlete's performance during high-intensity sporting events. This study design therefore highlighted that future studies focusing on sodium bicarbonate supplementation in team sports should concentrate on the efficiency of chronic and acute supplementation in varying time frames.
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Affiliation(s)
- Krzysztof Durkalec-Michalski
- Institute of Human Nutrition and Dietetics, Poznań University of Life Sciences, Wojska Polskiego 31, 60-624 Poznań, Poland.,Department of Food and Nutrition, Poznań University of Physical Education, Królowej Jadwigi 27/39, 61-871 Poznań, Poland
| | - Paulina M Nowaczyk
- Institute of Human Nutrition and Dietetics, Poznań University of Life Sciences, Wojska Polskiego 31, 60-624 Poznań, Poland
| | - Jacek Adrian
- Department of Theory and Methodology of Team Sport Games, Poznań University of Physical Education, Królowej Jadwigi 27/39, 61-871 Poznań, Poland
| | - Joanna Kamińska
- Department od Physiology and Biochemistry, Poznań University of Physical Education, Królowej Jadwigi 27/39, 61-871 Poznań, Poland
| | - Tomasz Podgórski
- Department od Physiology and Biochemistry, Poznań University of Physical Education, Królowej Jadwigi 27/39, 61-871 Poznań, Poland
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Hottenrott K, Werner T, Hottenrott L, Meyer TP, Vormann J. Exercise Training, Intermittent Fasting and Alkaline Supplementation as an Effective Strategy for Body Weight Loss: A 12-Week Placebo-Controlled Double-Blind Intervention with Overweight Subjects. Life (Basel) 2020; 10:life10050074. [PMID: 32455547 PMCID: PMC7281477 DOI: 10.3390/life10050074] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 05/19/2020] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Intermittent fasting (IF) combined with exercise has been suggested to enhance weight loss. However, both procedures might negatively influence acid-base status. The aim of this study was to determine the combined effects of IF, exercise training and alkaline supplementation in overweight subjects on body composition and running performance. METHODS 80 overweight subjects of age 45.5 ± 7.8 years were assigned to IF or non-intermittent fasting (nIF). Furthermore, subjects were randomly assigned to take either an alkaline supplement (IF-v, nIF-v) or a placebo (IF-p, nIF-p) twice a day. All subjects performed a personalized endurance exercise program (3-4 times/week for 12 weeks). Body weight, body composition, running performance and acid-base parameters were determined before (pre) and after the 12-week program (post). RESULTS 68 participants completed the study. There was a significant effect on body weight loss, body fat loss, visceral fat loss and running performance enhancement in all groups (p < 0.01) for pre and post measurements. Body weight decreased in all groups (IF-p: -5.80 ± 0.77 kg and nIF-p: -3.40 ± 0.58 kg; IF-v: -8.28 ± 0.75 kg and nIF-v: -5.59 ± 0.87 kg). In both dietary strategies, weight loss was significantly further enhanced by alkaline supplementation. The increase in running velocity was significantly higher in IF combined with alkaline supplementation (IF-v 1.73 ± 0.23 km/h and IF-p 0.97 ± 0.20 km/h). In addition, alkaline supplementation increased plasma HCO3- concentration and urinary pH. CONCLUSION Exercise training in combination with IF and alkaline supplementation is an effective strategy to reduce body weight and improve running performance in a 12-week intervention.
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Affiliation(s)
- Kuno Hottenrott
- Institute for Performance Diagnostics and Health Promotion, Martin-Luther-University of Halle-Wittenberg, 06108 Halle, Germany
| | - Tanja Werner
- NuOmix Research k.s. Applied Nutriomic Research, Martin, 81106 Bratislava, Slovaki
| | - Laura Hottenrott
- Faculty of Sport Science, Ruhr-University Bochum, 44801 Bochum, Germany
| | - Till P Meyer
- Institute of Sport Science, Martin-Luther-University of Halle-Wittenberg, 06108 Halle, Germany
| | - Jürgen Vormann
- Institute for Prevention and Nutrition, 85737 Ismaning, Germany
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61
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Enteric-coated sodium bicarbonate supplementation improves high-intensity cycling performance in trained cyclists. Eur J Appl Physiol 2020; 120:1563-1573. [PMID: 32388584 PMCID: PMC7295736 DOI: 10.1007/s00421-020-04387-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 05/02/2020] [Indexed: 12/01/2022]
Abstract
Purpose Enteric-coated sodium bicarbonate (NaHCO3) can attenuate gastrointestinal (GI) symptoms following acute bicarbonate loading, although the subsequent effects on exercise performance have not been investigated. The purpose of this study was to examine the effects of enteric-coated NaHCO3 supplementation on high-intensity exercise performance and GI symptoms. Methods Eleven trained male cyclists completed three 4 km time trials after consuming; a placebo or 0.3 g∙kg–1 body mass NaHCO3 in enteric-coated or gelatin capsules. Exercise trials were timed with individual peak blood bicarbonate ion concentration ([HCO3–]). Blood acid–base balance was measured pre-ingestion, pre-exercise, and post-exercise, whereas GI symptoms were recorded pre-ingestion and immediately pre-exercise. Results Pre-exercise blood [HCO3−] and potential hydrogen (pH) were greater for both NaHCO3 conditions (P < 0.0005) when compared to placebo. Performance time was faster with enteric-coated (− 8.5 ± 9.6 s, P = 0.044) and gelatin (− 9.6 ± 7.2 s, P = 0.004) NaHCO3 compared to placebo, with no significant difference between conditions (mean difference = 1.1 ± 5.3 s, P = 1.000). Physiological responses were similar between conditions, although blood lactate ion concentration was higher with gelatin NaHCO3 (2.4 ± 1.7 mmol∙L–1, P = 0.003) compared with placebo. Furthermore, fewer participants experienced GI symptoms with enteric-coated (n = 3) compared to gelatin (n = 7) NaHCO3. Discussion Acute enteric-coated NaHCO3 consumption mitigates GI symptoms at the onset of exercise and improves subsequent 4 km cycling TT performance. Athletes who experience GI side-effects after acute bicarbonate loading may, therefore, benefit from enteric-coated NaHCO3 supplementation prior to exercise performance.
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62
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The Effect of Sodium Bicarbonate Supplementation on the Decline in Gross Efficiency During a 2000-m Cycling Time Trial. Int J Sports Physiol Perform 2020; 15:741-747. [PMID: 31952047 DOI: 10.1123/ijspp.2019-0177] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 07/25/2019] [Accepted: 09/07/2019] [Indexed: 11/18/2022]
Abstract
BACKGROUND Gross efficiency (GE) declines during high-intensity exercise. Increasing extracellular buffer capacity might diminish the decline in GE and thereby improve performance. PURPOSE To examine if sodium bicarbonate (NaHCO3) supplementation diminishes the decline in GE during a 2000-m cycling time trial. METHODS Sixteen male cyclists and 16 female cyclists completed 4 testing sessions including a maximal incremental test, a familiarization trial, and two 2000-m GE tests. The 2000-m GE tests were performed after ingestion of either NaHCO3 supplements (0.3 g/kg body mass) or placebo supplements (amylum solani, magnesium stearate, and sunflower oil capsules). The GE tests were conducted using a double-blind, randomized, crossover design. Power output, gas exchange, and time to complete the 2000-m time trials were recorded. Capillary blood samples were analyzed for blood bicarbonate, pH, and lactate concentration. Data were analyzed using magnitude-based inference. RESULTS The decrement in GE found after the 2000-m time trial was possibly smaller in the male and female groups after NaHCO3 than with placebo ingestion, with the effect in both groups combined being unclear. The effect on performance was likely trivial for males (placebo 164.2 [5.0] s, NaHCO3 164.3 [5.0] s; Δ0.1; ±0.6%), unclear for females (placebo 178.6 [4.8] s, NaHCO3 178.0 [4.3] s; Δ-0.3; ±0.5%), and very likely trivial when effects were combined. Blood bicarbonate, pH, and lactate concentration were substantially elevated from rest to pretest after NaHCO3 ingestion. CONCLUSIONS NaHCO3 supplementation results in an unclear effect on the decrease in GE during high-intensity exercise and in a very likely trivial effect on performance.
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63
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Xu J, Farney TM, Nelson AG. Muscle Sentry® has No Effect on Total Work Performed and Estimated MVO 2 after High Intensity Short Duration Resistance Training. INTERNATIONAL JOURNAL OF EXERCISE SCIENCE 2020; 13:744-754. [PMID: 32509116 PMCID: PMC7241632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Supplements are widely used in recreational and professional participants; however, their claimed benefits are hardly to test. This study compared the total lifted numbers and post-exercise estimated MVO2 while subjects were treated with either Muscle Sentry® (MS) or placebo (PL), in a 7-day washout period. Participants (11 women, 10 men, 20-24 years) performed 3 sets to failure chest and leg press exercises at 8 RM with 2 min rest between sets. Each exercise was performed four times (2 × MS, 2 × PL) at the same time of the day separated by 48 h. The supplementation was ingested 40 min prior to perform the exercise. Prior to the exercise and immediately after each set, both HR and BP were obtained. The rate pressure product (RPP) was then calculated to determine estimated MVO2. Daily RPP and total weight lifted (chest + leg) for each supplementation were averaged. Normalized RPP was the ratio of averaged RPP and averaged total weight lifted. No treatment effect on chest, leg and total lift numbers, normalized post RPP (NPRPP), normalized RPPdiff (NRPPdiff) (p=0.94, 0.86, 0.87, 0.87, 0.43 respectively); No treatment effect on total lift numbers, NPRPP, NRPPdiff for gender (p=0.87, 0.95, 0.96 respectively). Ingestion of Muscle Sentry® 40 min prior to do 3 sets to failure of both chest and leg presses had no effect upon either total lift numbers or estimated MVO2. This suggests that, in some instances, the benefits of Muscle Sentry® are less than those claimed by the manufacturer.
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Affiliation(s)
- Junhai Xu
- School of Kinesiology, Louisiana State University, Baton Rouge, LA, USA
| | - Tyler M Farney
- School of Kinesiology, Louisiana State University, Baton Rouge, LA, USA
- Department of Health & Kinesiology, Texas A&M University-Kingsville, Kingsville, TX, USA
| | - Arnold G Nelson
- School of Kinesiology, Louisiana State University, Baton Rouge, LA, USA
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Effects of Sodium Bicarbonate Supplementation on Muscular Strength and Endurance: A Systematic Review and Meta-analysis. Sports Med 2020; 50:1361-1375. [DOI: 10.1007/s40279-020-01275-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Abstract
Sports supplements can be generally divided into 3 categories: sports foods (foods/drinks containing macronutrients), medical supplements (vitamins/minerals used to treat deficiencies), and ergogenic supplements (used to benefit performance). Supplements are not regulated by the US Food and Drug Administration. They may get to the market and be contaminated with substances banned in sport or dangerous to health; and the contents may not contain what is listed on the label. When choosing to use a supplement, the safest practice is to choose a certified brand, which tests and authenticates label verification, quality, and lack of contaminants and banned substances for sport.
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Affiliation(s)
- Katherine M Edenfield
- Department of Community Health and Family Medicine, University of Florida, Student Health Care Center, 280 Fletcher Drive, PO Box 117500, Gainesville, FL 32611, USA.
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66
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Durkalec-Michalski K, Zawieja EE, Zawieja BE, Michałowska P, Podgórski T. The gender dependent influence of sodium bicarbonate supplementation on anaerobic power and specific performance in female and male wrestlers. Sci Rep 2020; 10:1878. [PMID: 32024852 PMCID: PMC7002590 DOI: 10.1038/s41598-020-57590-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 01/03/2020] [Indexed: 11/29/2022] Open
Abstract
The aim of this study was the assessment of progressive low-dose sodium bicarbonate (NaHCO3) supplementation on the anaerobic indices in two bouts of Wingate tests (WT) separated by wrestling-specific performance test and assessing the gender differences in response. Fifty-one (18 F) wrestlers completed a randomized trial of either a NaHCO3 (up to 100 mg·kg−1) or a placebo for 10 days. Before and after treatment, athletes completed an exercise protocol that comprised, in sequence, the first WT1, dummy throw test (DT), and second WT2. The number of completed throws increased significantly in males from 19.3 ± 2.6 NaHCO3pre to 21.7 ± 2.9 NaHCO3post. ΔWT2-WT1 improved particularly in the midsection of 30-s WT on NaHCO3. However, no significant differences were found in peak power (PP), power drop (PD) and average power (AP) (analyzed separately for each WT), and ΔWT2-WT1 in PP and PD. Interaction with gender was significant for AP, PP and PD, every second of WT1 and WT2, as well as DT test. In conclusion, our study suggests that the response to NaHCO3 may be gender-specific and progressive low-dose NaHCO3 supplementation allows the advantageous strengthening of wrestling-specific performance in males. It can also lead to maintenance of high anaerobic power mainly in the midsection of the 30-s Wingate test.
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Affiliation(s)
- Krzysztof Durkalec-Michalski
- Institute of Human Nutrition and Dietetics, Poznań University of Life Sciences, Poznań, 60-624, Poland. .,Department of Food and Nutrition, Poznań University of Physical Education, Poznań, 61-871, Poland.
| | - Emilia E Zawieja
- Institute of Human Nutrition and Dietetics, Poznań University of Life Sciences, Poznań, 60-624, Poland
| | - Bogna E Zawieja
- Department of Mathematical and Statistical Methods, Poznań University of Life Sciences, Poznań, 60-637, Poland
| | - Patrycja Michałowska
- Institute of Human Nutrition and Dietetics, Poznań University of Life Sciences, Poznań, 60-624, Poland
| | - Tomasz Podgórski
- Department od Physiology and Biochemistry, Poznań University of Physical Education, Poznań, 61-871, Poland
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67
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Toledo LP, Vieira JG, Dias MR. Acute effect of sodium bicarbonate supplementation on the performance during CrossFit® training. MOTRIZ: REVISTA DE EDUCACAO FISICA 2020. [DOI: 10.1590/s1980-6574202000040075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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68
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Grgic J, Garofolini A, Pickering C, Duncan MJ, Tinsley GM, Del Coso J. Isolated effects of caffeine and sodium bicarbonate ingestion on performance in the Yo-Yo test: A systematic review and meta-analysis. J Sci Med Sport 2020; 23:41-47. [DOI: 10.1016/j.jsams.2019.08.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 08/14/2019] [Accepted: 08/16/2019] [Indexed: 10/26/2022]
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69
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Rezaei S, Akbari K, Gahreman DE, Sarshin A, Tabben M, Kaviani M, Sadeghinikoo A, Koozehchian MS, Naderi A. Caffeine and sodium bicarbonate supplementation alone or together improve karate performance. J Int Soc Sports Nutr 2019; 16:44. [PMID: 31623659 PMCID: PMC6798418 DOI: 10.1186/s12970-019-0313-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 09/25/2019] [Indexed: 11/28/2022] Open
Abstract
Background The ergogenic properties of acute caffeine (CAF) and sodium bicarbonate (NaHCO3) ingestion on athletic performance have been previously investigated. However, each sport has unique physiological and technical characteristics which warrants optimizing supplementations strategies for maximizing performance. This study examined the effects of CAF and NaHCO3 ingestion on physiological responses and rate of perceived exertion during a Karate-specific aerobic test (KSAT) in competitive karatekas. Methods In a double-blind, crossover, randomized placebo-controlled trial, eight Karatekas underwent five experimental conditions including control (CON), placebo (PLA), CAF, NaHCO3, and CAF + NaHCO3 before completing KSAT. Capsules containing 6 mg/kg BW CAF were consumed 50 min prior to a KSAT whilst 0.3 g/kg BW NaHCO3 was consumed for 3 days leading to and 120, 90, and 60 min prior to a KSAT. Time to exhaustion (TTE), rate of perceived exertion (RPE), and blood lactate (BL) were measured before, immediately after and 3 min following KSAT. Results TTE was significantly greater following CAF, NaHCO3, and CAF + NaHCO3 consumption compared to PLA and CON. However, the differences between CAF, NaHCO3, and CAF + NaHCO3 were not statistically significant (p > 0.05). BL increased significantly from baseline to immediately after and 3 min following KSAT in all conditions (p < 0.01), while RPE at the end of KSAT was not significantly different between conditions (p = 0.11). Conclusions Karate practitioners may benefit from the ergogenic effects of CAF and NaHCO3 when consumed separately or together.
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Affiliation(s)
- Sajjad Rezaei
- Physical Education and Sport Sciences Department, Faculty of Humanities, Tarbiat Modares University, Tehran, Iran
| | - Kazem Akbari
- Department of exercise physiology, Faculty of Physical education and sport sciences, Kharazmi University, Tehran, Iran. .,Raad Sports Club, Tehran, Iran.
| | - Daniel E Gahreman
- College of Health and Human Sciences, Charles Darwin University, Darwin, Australia
| | - Amir Sarshin
- Faculty of Physical education and sport sciences, Department of Exercise Physiology, Karaj Branch, Islamic Azad University, Karaj, Iran
| | - Montassar Tabben
- Aspetar, Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar
| | - Mojtaba Kaviani
- School of Nutrition and Dietetics, Acadia University, Wolfville, Nova Scotia, Canada
| | | | - Majid S Koozehchian
- Department of Kinesiology, Jacksonville State University, Jacksonville, AL, 36265, USA
| | - Alireza Naderi
- Sports Physiology Department, Islamic Azad University, Boroujerd Branch, Boroujerd, Iran
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Perim P, Marticorena FM, Ribeiro F, Barreto G, Gobbi N, Kerksick C, Dolan E, Saunders B. Can the Skeletal Muscle Carnosine Response to Beta-Alanine Supplementation Be Optimized? Front Nutr 2019; 6:135. [PMID: 31508423 PMCID: PMC6718727 DOI: 10.3389/fnut.2019.00135] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 08/09/2019] [Indexed: 12/14/2022] Open
Abstract
Carnosine is an abundant histidine-containing dipeptide in human skeletal muscle and formed by beta-alanine and L-histidine. It performs various physiological roles during exercise and has attracted strong interest in recent years with numerous investigations focused on increasing its intramuscular content to optimize its potential ergogenic benefits. Oral beta-alanine ingestion increases muscle carnosine content although large variation in response to supplementation exists and the amount of ingested beta-alanine converted into muscle carnosine appears to be low. Understanding of carnosine and beta-alanine metabolism and the factors that influence muscle carnosine synthesis with supplementation may provide insight into how beta-alanine supplementation may be optimized. Herein we discuss modifiable factors that may further enhance the increase of muscle carnosine in response to beta-alanine supplementation including, (i) dose; (ii) duration; (iii) beta-alanine formulation; (iv) dietary influences; (v) exercise; and (vi) co-supplementation with other substances. The aim of this narrative review is to outline the processes involved in muscle carnosine metabolism, discuss theoretical and mechanistic modifiable factors which may optimize the muscle carnosine response to beta-alanine supplementation and to make recommendations to guide future research.
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Affiliation(s)
- Pedro Perim
- Applied Physiology and Nutrition Research Group, Rheumatology Division, Faculdade de Medicina FMUSP, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil
| | - Felipe Miguel Marticorena
- Applied Physiology and Nutrition Research Group, Rheumatology Division, Faculdade de Medicina FMUSP, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil
| | - Felipe Ribeiro
- Applied Physiology and Nutrition Research Group, Rheumatology Division, Faculdade de Medicina FMUSP, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil
| | - Gabriel Barreto
- Applied Physiology and Nutrition Research Group, Rheumatology Division, Faculdade de Medicina FMUSP, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil
| | - Nathan Gobbi
- Applied Physiology and Nutrition Research Group, Rheumatology Division, Faculdade de Medicina FMUSP, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil
| | - Chad Kerksick
- Exercise and Performance Nutrition Laboratory, Lindenwood University, St. Charles, MO, United States
| | - Eimear Dolan
- Applied Physiology and Nutrition Research Group, Rheumatology Division, Faculdade de Medicina FMUSP, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil
| | - Bryan Saunders
- Applied Physiology and Nutrition Research Group, Rheumatology Division, Faculdade de Medicina FMUSP, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil.,Institute of Orthopaedics and Traumatology, Faculty of Medicine FMUSP, University of São Paulo, São Paulo, Brazil
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71
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The Effect of Beta-Alanine versus Alkaline Agent Supplementation Combined with Branched-Chain Amino Acids and Creatine Malate in Highly-Trained Sprinters and Endurance Athletes: A Randomized Double-Blind Crossover Study. Nutrients 2019; 11:nu11091961. [PMID: 31438535 PMCID: PMC6769605 DOI: 10.3390/nu11091961] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 08/16/2019] [Accepted: 08/16/2019] [Indexed: 12/18/2022] Open
Abstract
The study aimed to verify the effect of intra- (beta-alanine—BA) versus extra- (alkaline agents—ALK) cellular buffering agent supplementation, combined with customarily used branched-chain amino acids (BCAAs) and creatine malate (TCM) treatment in natural training conditions. Thirty-one elite athletes (11 sprinters and 20 endurance athletes) participated in the study. Eight-week randomized double-blind, crossover, combined supplementation with BA-ALKplaBCAA&TCM and ALK-BAplaBCAA&TCM was implemented. In the course of the experiment, body composition, aerobic capacity, and selected blood markers were assayed. After BA-ALKplaBCAA&TCM supplementation, total fat-free mass increased in sprinters (p = 0.009). No other differences were found in body composition, respiratory parameters, aerobic capacity, blood lactate concentration, and hematological indices after BA-ALKplaBCAA&TCM/ALK-BAplaBCAA&TCM supplementation. The maximum post-exercise blood ammonia (NH3) concentration decreased in both groups after BA-ALKplaBCAA&TCM supplementation (endurance, p = 0.002; sprint, p < 0.0001). Also, lower NH3 concentrations were observed in endurance athletes in the post-exercise recovery period. The results of our study indicate that combined BCAA, TCM, and BA supplementation is more effective than combined BCAA, TCM and ALK supplementation for an increase in fat-free mass and exercise adaptation, but not for aerobic capacity improvement. Besides, it seems that specific exercise stimuli and the training status are key factors affecting exercise performance, even in athletes using efficient supplementation.
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Cunha VCR, Aoki MS, Zourdos MC, Gomes RV, Barbosa WP, Massa M, Moreira A, Capitani CD. Sodium citrate supplementation enhances tennis skill performance: a crossover, placebo-controlled, double blind study. J Int Soc Sports Nutr 2019; 16:32. [PMID: 31370896 PMCID: PMC6676531 DOI: 10.1186/s12970-019-0297-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 07/08/2019] [Indexed: 11/25/2022] Open
Abstract
Background The efficacy of sodium citrate supplementation (SC) in exercise performance is unclear. Therefore, the aim of this study was to investigate the effect of SC on skilled tennis performance. Methods Ten Brazilian nationally-ranked young male tennis players (age: 17 ± 1 yrs.; stature: 176.7 ± 5.2 cm; body mass: 68.4 ± 7.9 kg) participated in this crossover, placebo-controlled, double-blind study. Upon arrival, at baseline, in both experimental sessions blood was collected, then subjects ingested either sodium citrate (SC - 0.5 g.kg−1BM in capsules of 500 mg) or a placebo (PLA). Two hours later, pre-match blood was collected then skills tests (skill tennis performance test - STPT, repeated-sprint ability shuttle test - RSA) were performed followed by a 1-h simulated match. Immediately following the match, blood was again collected, and STPT, and RSA were administered. Results All metabolic parameters (i.e. base excess, pH, bicarbonate, and blood lactate) increased (p < 0.001) from baseline to pre-match and post-match in SC condition. Each metabolic parameter was greater (p < 0.001) in SC compared to PLA condition at both pre- and post-match. The SC condition elicited a greater (p < 0.01) shot consistency at post-match in the STPT vs. PLA condition (SC: 58.5 ± 14.8% vs. PLA: 40.4 ± 10.4%). A greater (p < 0.001) amount of games won was observed in the simulated match for SC condition vs. PLA condition (SC: 8.0 ± 1.6 vs. PLA: 6.0 ± 1.7). Additionally, the games won during the simulated match in SC condition was positively correlated with percentage shot consistency (r = 0.67, p < 0.001). Conclusions The current findings suggest that SC supplementation is an effective ergogenic aid to enhance skilled tennis performance.
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Affiliation(s)
- Vivian C R Cunha
- School of Applied Sciences, University of Campinas, Rua Pedro Zaccaria 1300, Limeira, 13484-350, Sao Paulo, Brazil
| | - Marcelo S Aoki
- School of Arts, Sciences and Humanities, University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil
| | - Michael C Zourdos
- Department of Exercise Science and Health Promotion, Muscle Physiology Laboratory, Florida Atlantic University, Kissimme, Florida, USA
| | - Rodrigo V Gomes
- School of Arts, Sciences and Humanities, University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil
| | - Wesley P Barbosa
- School of Arts, Sciences and Humanities, University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil
| | - Marcelo Massa
- School of Arts, Sciences and Humanities, University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil
| | - Alexandre Moreira
- School of Physical Education and Sport, University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil
| | - Caroline D Capitani
- School of Applied Sciences, University of Campinas, Rua Pedro Zaccaria 1300, Limeira, 13484-350, Sao Paulo, Brazil.
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73
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Lopes-Silva JP, Choo HC, Franchini E, Abbiss CR. Isolated ingestion of caffeine and sodium bicarbonate on repeated sprint performance: A systematic review and meta-analysis. J Sci Med Sport 2019; 22:962-972. [PMID: 31036532 DOI: 10.1016/j.jsams.2019.03.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2018] [Revised: 03/11/2019] [Accepted: 03/14/2019] [Indexed: 01/27/2023]
Abstract
OBJECTIVES This study is a systematic review and meta-analysis aimed at investigating the isolated effects of caffeine and sodium bicarbonate (NaHCO3) ingestion on repeated sprint ability (RSA). METHODS Following a search through PubMed and Scopus, 13 studies (7 with caffeine and 6 with NaHCO3) were found to meet inclusion criteria. Random-effects of standardized mean difference (SMD) for total work and best sprint performance was examined. Study quality was assessed using QualSyst. RESULTS The meta-analysis indicated that caffeine ingestion did not improve the total work done (weighted average effect size Hedges's g = -0.01, 95%CI: -0.32 to 0.31, p = 0.97), best sprint (weighted average effect size Hedges's g = -0.02, 95% CI: -0.32 to 0.27; p = 0.87) or last sprint performance (weighed average effect size Hedge's g = -0.27, 95%CI: -0.68 to 0.14; p = 0.20), when compared with a placebo condition. Similarly, NaHCO3 ingestion did not improve the total work done (weighted average effect size Hedges's g = 0.43, 95% CI: -0.11 to 0.97, p = 0.12), best sprint (weighted average effect size Hedges's g = 0.02, 95% CI -0.30 to 0.34; p = 0.90) or last sprint performance (weighted average effect size Hedge's g = 0.20, 95%CI: -0.13 to 0.52, p = 0.14), compared with a placebo condition. Quality assessment of selected articles was classified as strong. CONCLUSION This meta-analysis provides evidence that repeated sprint ability is not affected by acute ingestion of caffeine or NaHCO3.
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Affiliation(s)
- João P Lopes-Silva
- School of Physical Education, Cesmac University Center, Maceió, Alagoas, Brazil; UNINASSAU, Maceió, Alagoas, Brazil; High-Intensity Intermittent Exercise Physiology Research Group, School of Physical and Education and Sport, University of São Paulo, São Paulo, Brazil.
| | - Hui C Choo
- Centre for Exercise and Sports Science Research (CESSR), School of Medical and Health Sciences, Edith Cowan University, 270 Joondalup Dr, Joondalup, WA 6027, Australia
| | - Emerson Franchini
- High-Intensity Intermittent Exercise Physiology Research Group, School of Physical and Education and Sport, University of São Paulo, São Paulo, Brazil; Australian Institute of Sport, Canberra, Australia
| | - Chris R Abbiss
- Centre for Exercise and Sports Science Research (CESSR), School of Medical and Health Sciences, Edith Cowan University, 270 Joondalup Dr, Joondalup, WA 6027, Australia
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Sports Foods and Dietary Supplements for Optimal Function and Performance Enhancement in Track-and-Field Athletes. Int J Sport Nutr Exerc Metab 2019; 29:198-209. [PMID: 30299192 DOI: 10.1123/ijsnem.2018-0271] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Athletes are exposed to numerous nutritional products, attractively marketed with claims of optimizing health, function, and performance. However, there is limited evidence to support many of these claims, and the efficacy and safety of many products is questionable. The variety of nutritional aids considered for use by track-and-field athletes includes sports foods, performance supplements, and therapeutic nutritional aids. Support for sports foods and five evidence-based performance supplements (caffeine, creatine, nitrate/beetroot juice, β-alanine, and bicarbonate) varies according to the event, the specific scenario of use, and the individual athlete's goals and responsiveness. Specific challenges include developing protocols to manage repeated use of performance supplements in multievent or heat-final competitions or the interaction between several products which are used concurrently. Potential disadvantages of supplement use include expense, false expectancy, and the risk of ingesting banned substances sometimes present as contaminants. However, a pragmatic approach to the decision-making process for supplement use is recommended. The authors conclude that it is pertinent for sports foods and nutritional supplements to be considered only where a strong evidence base supports their use as safe, legal, and effective and that such supplements are trialed thoroughly by the individual before committing to use in a competition setting.
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Lopes-Silva JP, Reale R, Franchini E. Acute and chronic effect of sodium bicarbonate ingestion on Wingate test performance: a systematic review and meta-analysis. J Sports Sci 2018; 37:762-771. [DOI: 10.1080/02640414.2018.1524739] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- João Paulo Lopes-Silva
- High-Intensity Intermittent Exercise Physiology Research Group, School of Physical and Education and Sport, University of São Paulo, São Paulo, Brazil
- School of Physical Education, Cesmac University Center, Maceió, Alagoas, Brazil
- UNINASSAU, Maceió, Alagoas, Brazil
| | - Reid Reale
- Gatorade Sports Science Institute, Bradenton, Florida, USA
| | - Emerson Franchini
- High-Intensity Intermittent Exercise Physiology Research Group, School of Physical and Education and Sport, University of São Paulo, São Paulo, Brazil
- Australian Institute of Sport, Canberra, Australia
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76
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High doses of sodium bicarbonate increase lactate levels and delay exhaustion in a cycling performance test. Nutrition 2018; 60:94-99. [PMID: 30551121 DOI: 10.1016/j.nut.2018.09.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 09/29/2018] [Indexed: 11/22/2022]
Abstract
OBJECTIVES It is well established that ingestion of sodium bicarbonate (NaHCO3) causes metabolic alkalosis. However, there is no consensus in terms of optimal NaHCO3 doses leading to enhanced performance. This study aimed to determine the effects of different NaHCO3 doses on performance and lactate clearance in non-professional cyclists. METHODS Twenty-one cyclists performed the following three double-blind trials: 1) ingestion of 0.3 g · kg-1 body weight (BW) of placebo; 2) ingestion of 0.1 g · kg-1 BW NaHCO3 plus 0.2 g · kg-1 BW placebo (0.1 BC); and 3) ingestion of 0.3 g · kg-1 BW NaHCO3 (0.3 BC). Performance was evaluated after warm-up on the bike followed by a performance test until exhaustion. Lactate levels were monitored in blood samples before and immediately after performance tests. RESULTS Lactate levels in the blood were significantly higher after exercise in 0.3 BC and 0.1 BC (15.12 ± 0.92 versus 10.3 ± 1.22 and 13.24 ± 0.87 versus 10.3 ± 1.22 mmol/L; P < 0.05) compared with control. Significant improvements in performance were only identified in 0.3 BC group (76.42 ± 2.14; P = 0.01). CONCLUSIONS The present study found that 0.3 g · kg-1 BW NaHCO3 is effective in improving performance and improving blood lactate levels in cyclists compared with control and 0.1 g · kg-1 BW NaHCO3.
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The Effect of a New Sodium Bicarbonate Loading Regimen on Anaerobic Capacity and Wrestling Performance. Nutrients 2018; 10:nu10060697. [PMID: 29848993 PMCID: PMC6024820 DOI: 10.3390/nu10060697] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 05/11/2018] [Accepted: 05/28/2018] [Indexed: 11/24/2022] Open
Abstract
Gastrointestinal side effects are the main problem with sodium bicarbonate (SB) use in sports. Therefore, our study assessed the effect of a new SB loading regimen on anaerobic capacity and wrestling performance. Fifty-eight wrestlers were randomized to either a progressive-dose regimen of up to 100 mg∙kg−1 of SB or a placebo for 10 days. Before and after treatment, athletes completed an exercise protocol that comprised, in sequence, the first Wingate, dummy throw, and second Wingate tests. Blood samples were taken pre- and post-exercise. No gastrointestinal side effects were reported during the study. After SB treatment, there were no significant improvements in the outcomes of the Wingate and dummy throw tests. The only index that significantly improved with SB, compared to the placebo (p = 0.0142), was the time-to-peak power in the second Wingate test, which decreased from 3.44 ± 1.98 to 2.35 ± 1.17 s. There were also no differences in blood lactate or glucose concentrations. In conclusion, although the new loading regimen eliminated gastrointestinal symptoms, the doses could have been too small to elicit additional improvements in anaerobic power and wrestling performance. However, shortening the time-to-peak power during fatigue may be particularly valuable and is one of the variables contributing to the final success of a combat sports athlete.
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The effect of chronic progressive-dose sodium bicarbonate ingestion on CrossFit-like performance: A double-blind, randomized cross-over trial. PLoS One 2018; 13:e0197480. [PMID: 29771966 PMCID: PMC5957406 DOI: 10.1371/journal.pone.0197480] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 05/02/2018] [Indexed: 11/29/2022] Open
Abstract
Background Sodium bicarbonate (SB) has been proposed as an ergogenic aid, as it improves high-intensity and resistance exercise performance. However, no studies have yet investigated SB application in CrossFit. This study examined the effects of chronic, progressive-dose SB ingestion on CrossFit-like performance and aerobic capacity. Methods In a randomized, double-blind, cross-over trial, 21 CrossFit-trained participants were randomly allocated to 2 groups and underwent 2 trials separated by a 14-day washout period. Participants ingested either up to 150 mg∙kg-1 of SB in a progressive-dose regimen or placebo for 10 days. Before and after each trial, Fight Gone Bad (FGB) and incremental cycling (ICT) tests were performed. In order to examine biochemical responses, blood samples were obtained prior to and 3 min after completing each exercise test. Results No gastrointestinal (GI) side effects were reported during the entire protocol. The overall FGB performance improved under SB by ~6.1% (p<0.001) and it was ~3.1% higher compared to post placebo (PLApost) (p = 0.040). The number of repetitions completed in each round also improved under SB (mean from baseline: +5.8% to +6.4%). Moreover, in ICT, the time to ventilatory threshold (VT) (~8:25 min SBpost vs. ~8:00 min PLApost, p = 0.020), workload at VT (~218 W SBpost vs. ~208 W PLApost, p = 0.037) and heart rate at VT (~165 bpm SBpost vs. ~161 bpm PLApost, p = 0.030) showed higher SBpost than PLApost. Furthermore, the maximum carbon dioxide production increased under SB by ~4.8% (from ~3604 mL∙min-1 to ~3776 mL∙min-1, p = 0.049). Pyruvate concentration and creatine kinase activity before ICT showed higher SBpost than PLApost (~0.32 mmol∙L-1 vs. ~0.26 mmol∙L-1, p = 0.001; ~275 U∙L-1 vs. ~250 U∙L-1, p = 0.010, respectively). However, the small sample size limits the wide-application of our results. Conclusions Progressive-dose SB ingestion regimen eliminated GI side effects and improved CrossFit-like performance, as well as delayed ventilatory threshold occurrence.
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Heibel AB, Perim PHL, Oliveira LF, McNaughton LR, Saunders B. Time to Optimize Supplementation: Modifying Factors Influencing the Individual Responses to Extracellular Buffering Agents. Front Nutr 2018; 5:35. [PMID: 29868599 PMCID: PMC5951986 DOI: 10.3389/fnut.2018.00035] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Accepted: 04/19/2018] [Indexed: 11/13/2022] Open
Abstract
Blood alkalosis, as indicated by an increased blood bicarbonate concentration and pH, has been shown to be beneficial for exercise performance. Sodium bicarbonate, sodium citrate, and sodium or calcium lactate, can all result in increased circulating bicarbonate and have all independently been shown to improve exercise capacity and performance under various circumstances. Although there is considerable evidence demonstrating the efficacy of these supplements in several sports-specific situations, it is commonly acknowledged that their efficacy is equivocal, due to contrasting evidence. Herein, we discuss the physiological and environmental factors that may modify the effectiveness of these supplements including, (i) absolute changes in circulating bicarbonate; (ii) supplement timing, (iii) the exercise task performed, (iv) monocarboxylate transporter (MCT) activity; (v) training status, and (vi) associated side-effects. The aim of this narrative review is to highlight the factors which may modify the response to these supplements, so that individuals can use this information to attempt to optimize supplementation and allow the greatest possibility of an ergogenic effect.
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Affiliation(s)
- André B Heibel
- Applied Physiology and Nutrition Research Group, University of São Paulo, São Paulo, Brazil.,Laboratory of Nutritional Biochemistry, University of Brasília, Brasília, Brazil
| | - Pedro H L Perim
- Applied Physiology and Nutrition Research Group, University of São Paulo, São Paulo, Brazil.,São Camilo University Centre, São Paulo, Brazil
| | - Luana F Oliveira
- Applied Physiology and Nutrition Research Group, University of São Paulo, São Paulo, Brazil.,School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil
| | - Lars R McNaughton
- Sports Nutrition and Performance Group, Department of Sport and Physical Activity, Edge Hill University, Ormskirk, United Kingdom.,Department of Sport and Movement Studies, Faculty of Health Science, University of Johannesburg, Johannesburg, South Africa
| | - Bryan Saunders
- Applied Physiology and Nutrition Research Group, University of São Paulo, São Paulo, Brazil.,Rheumatology Division, Faculty of Medicine, University of São Paulo, São Paulo, Brazil.,Institute of Orthopaedics and Traumatology, Faculty of Medicine, University of São Paulo, São Paulo, Brazil
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80
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Wroble KA, Trott MN, Schweitzer GG, Rahman RS, Kelly PV, Weiss EP. Low-carbohydrate, ketogenic diet impairs anaerobic exercise performance in exercise-trained women and men: a randomized-sequence crossover trial. J Sports Med Phys Fitness 2018; 59:600-607. [PMID: 29619799 DOI: 10.23736/s0022-4707.18.08318-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
BACKGROUND Low-carbohydrate, ketogenic diets cause mild, subclinical systemic acidosis. Anaerobic exercise performance is limited by acidosis. Therefore, we evaluated the hypothesis that a low-carbohydrate, ketogenic diet impairs anaerobic exercise performance, as compared to a high-carbohydrate diet. METHODS Sixteen men and women (BMI, 23±1 kg/m2, age 23±1 years) participated in a randomized-sequence, counterbalanced crossover study in which they underwent exercise testing after 4 days of either a low-carbohydrate, ketogenic diet (LC; <50 g/day and <10% of energy from carbohydrates) or a high-carbohydrate diet (HC; 6-10 g/kg/day carbohydrate). Dietary compliance was assessed with nutrient analysis of diet records, and with measures of urine pH and ketones. Anaerobic exercise performance was evaluated with the Wingate anaerobic cycling test and the yo-yo intermittent recovery test. RESULTS The diets were matched for total energy (LC: 2333±158 kcal/d; HC: 2280±160 kcal/d; P=0.65) but differed in carbohydrate content (9±1% vs. 63±2% of energy intake; P<0.001). LC resulted in lower urine pH (5.9±0.1 vs. 6.3±0.2, P=0.004) and the appearance of urine ketones in every participant. LC resulted in 7% lower peak power (801±58 watts vs. 857±61 watts, P=0.008) and 6% lower mean power (564±50 watts vs. 598±51 watts, P=0.01) during the Wingate Test. Total distance ran in the yo-yo intermittent recovery test was 15% less after LC diet (887±139 vs. 1045±145 meters, P=0.02). CONCLUSIONS Short-term low-carbohydrate, ketogenic diets reduce exercise performance in activities that are heavily dependent on anaerobic energy systems. These findings have clear performance implications for athletes, especially for high-intensity, short duration activities and sports.
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Affiliation(s)
- Kymberly A Wroble
- Department of Nutrition and Dietetics, Saint Louis University, St. Louis, MO, USA
| | - Morgan N Trott
- Department of Nutrition and Dietetics, Saint Louis University, St. Louis, MO, USA
| | - George G Schweitzer
- Department of Nutrition and Dietetics, Saint Louis University, St. Louis, MO, USA.,Division of Geriatrics and Nutritional Science, Washington University School of Medicine, St. Louis, MO, USA
| | - Rabia S Rahman
- Department of Nutrition and Dietetics, Saint Louis University, St. Louis, MO, USA
| | - Patrick V Kelly
- Doisy College of Health Sciences, Saint Louis University, St. Louis, MO, USA
| | - Edward P Weiss
- Department of Nutrition and Dietetics, Saint Louis University, St. Louis, MO, USA - .,Doisy College of Health Sciences, Saint Louis University, St. Louis, MO, USA
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81
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Maughan RJ, Burke LM, Dvorak J, Larson-Meyer DE, Peeling P, Phillips SM, Rawson ES, Walsh NP, Garthe I, Geyer H, Meeusen R, van Loon LJC, Shirreffs SM, Spriet LL, Stuart M, Vernec A, Currell K, Ali VM, Budgett RG, Ljungqvist A, Mountjoy M, Pitsiladis YP, Soligard T, Erdener U, Engebretsen L. IOC consensus statement: dietary supplements and the high-performance athlete. Br J Sports Med 2018; 52:439-455. [PMID: 29540367 PMCID: PMC5867441 DOI: 10.1136/bjsports-2018-099027] [Citation(s) in RCA: 331] [Impact Index Per Article: 55.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/03/2018] [Indexed: 12/24/2022]
Abstract
Nutrition usually makes a small but potentially valuable contribution to successful performance in elite athletes, and dietary supplements can make a minor contribution to this nutrition programme. Nonetheless, supplement use is widespread at all levels of sport. Products described as supplements target different issues, including (1) the management of micronutrient deficiencies, (2) supply of convenient forms of energy and macronutrients, and (3) provision of direct benefits to performance or (4) indirect benefits such as supporting intense training regimens. The appropriate use of some supplements can benefit the athlete, but others may harm the athlete's health, performance, and/or livelihood and reputation (if an antidoping rule violation results). A complete nutritional assessment should be undertaken before decisions regarding supplement use are made. Supplements claiming to directly or indirectly enhance performance are typically the largest group of products marketed to athletes, but only a few (including caffeine, creatine, specific buffering agents and nitrate) have good evidence of benefits. However, responses are affected by the scenario of use and may vary widely between individuals because of factors that include genetics, the microbiome and habitual diet. Supplements intended to enhance performance should be thoroughly trialled in training or simulated competition before being used in competition. Inadvertent ingestion of substances prohibited under the antidoping codes that govern elite sport is a known risk of taking some supplements. Protection of the athlete's health and awareness of the potential for harm must be paramount; expert professional opinion and assistance is strongly advised before an athlete embarks on supplement use.
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Affiliation(s)
| | - Louise M Burke
- Sports Nutrition, Australian Institute of Sport, Canberra, Australia
- Mary MacKillop Institute for Health Research, Melbourne, Australia
| | - Jiri Dvorak
- Department of Neurology, Schulthess Clinic, Zurich, Switzerland
| | - D Enette Larson-Meyer
- Department of Family & Consumer Sciences (Human Nutrition), University of Wyoming, Laramie, Wyoming, USA
| | - Peter Peeling
- School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Crawley, Western Australia, Australia
- Western Australian Institute of Sport, Mount Claremont, Australia
| | | | - Eric S Rawson
- Department of Health, Nutrition, and Exercise Science, Messiah College, Mechanicsburg, Pennsylvania, USA
| | - Neil P Walsh
- College of Health and Behavioural Sciences, Bangor University, Bangor, UK
| | - Ina Garthe
- The Norwegian Olympic and Paralympic Committee and Confederation of Sport, Oslo, Norway
| | - Hans Geyer
- Institute of Biochemistry, Center for Preventive Doping Research, German Sport University, Cologne, Germany
| | - Romain Meeusen
- Human Physiology Research Group, Vrije Universiteit Brussel, Brussel, Belgium
| | - Lucas J C van Loon
- Mary MacKillop Institute for Health Research, Melbourne, Australia
- Department of Human Biology and Movement Sciences, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre, Maastricht, The Netherlands
| | | | - Lawrence L Spriet
- Human Health & Nutritional Sciences, University of Guelph, Ontario, Canada
| | | | - Alan Vernec
- Department of Science and Medicine, World Anti-Doping Agency (WADA), Montreal, Canada
| | | | - Vidya M Ali
- Medical and Scientific Commission, International Olympic Committee, Lausanne, Switzerland
| | - Richard Gm Budgett
- Medical and Scientific Department, International Olympic Committee, Lausanne, Switzerland
| | | | - Margo Mountjoy
- Human Health and Nutritional Sciences, Health and Performance, Centre University of Guelph, Guelph, Ontario, Canada
- Medical and Scientific Commission Games Group, International Olympic Committee, Lausanne, Switzerland
| | - Yannis P Pitsiladis
- Medical and Scientific Commission, International Olympic Committee, Lausanne, Switzerland
| | - Torbjørn Soligard
- Medical and Scientific Department, International Olympic Committee, Lausanne, Switzerland
| | - Uğur Erdener
- Medical and Scientific Commission, International Olympic Committee, Lausanne, Switzerland
| | - Lars Engebretsen
- Medical and Scientific Department, International Olympic Committee, Lausanne, Switzerland
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82
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IOC Consensus Statement: Dietary Supplements and the High-Performance Athlete. Int J Sport Nutr Exerc Metab 2018; 28:104-125. [PMID: 29589768 DOI: 10.1123/ijsnem.2018-0020] [Citation(s) in RCA: 261] [Impact Index Per Article: 43.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Nutrition usually makes a small but potentially valuable contribution to successful performance in elite athletes, and dietary supplements can make a minor contribution to this nutrition program. Nonetheless, supplement use is widespread at all levels of sport. Products described as supplements target different issues, including the management of micronutrient deficiencies, supply of convenient forms of energy and macronutrients, and provision of direct benefits to performance or indirect benefits such as supporting intense training regimens. The appropriate use of some supplements can offer benefits to the athlete, but others may be harmful to the athlete's health, performance, and/or livelihood and reputation if an anti-doping rule violation results. A complete nutritional assessment should be undertaken before decisions regarding supplement use are made. Supplements claiming to directly or indirectly enhance performance are typically the largest group of products marketed to athletes, but only a few (including caffeine, creatine, specific buffering agents and nitrate) have good evidence of benefits. However, responses are affected by the scenario of use and may vary widely between individuals because of factors that include genetics, the microbiome, and habitual diet. Supplements intended to enhance performance should be thoroughly trialed in training or simulated competition before implementation in competition. Inadvertent ingestion of substances prohibited under the anti-doping codes that govern elite sport is a known risk of taking some supplements. Protection of the athlete's health and awareness of the potential for harm must be paramount, and expert professional opinion and assistance is strongly advised before embarking on supplement use.
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83
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Abstract
A strong foundation in physical conditioning and sport-specific experience, in addition to a bespoke and periodized training and nutrition program, are essential for athlete development. Once these underpinning factors are accounted for, and the athlete reaches a training maturity and competition level where marginal gains determine success, a role may exist for the use of evidence-based performance supplements. However, it is important that any decisions surrounding performance supplements are made in consideration of robust information that suggests the use of a product is safe, legal, and effective. The following review focuses on the current evidence-base for a number of common (and emerging) performance supplements used in sport. The supplements discussed here are separated into three categories based on the level of evidence supporting their use for enhancing sports performance: (1) established (caffeine, creatine, nitrate, beta-alanine, bicarbonate); (2) equivocal (citrate, phosphate, carnitine); and (3) developing. Within each section, the relevant performance type, the potential mechanisms of action, and the most common protocols used in the supplement dosing schedule are summarized.
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84
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Lopes-Silva JP, Da Silva Santos JF, Artioli GG, Loturco I, Abbiss C, Franchini E. Sodium bicarbonate ingestion increases glycolytic contribution and improves performance during simulated taekwondo combat. Eur J Sport Sci 2018; 18:431-440. [PMID: 29355092 DOI: 10.1080/17461391.2018.1424942] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
PURPOSE To investigate the effect of sodium bicarbonate (NaHCO3) on performance and estimated energy system contribution during simulated taekwondo combat. METHODS Nine taekwondo athletes completed two experimental sessions separated by at least 48 h. Athletes consumed 300 mg/kg body mass of NaHCO3 or placebo (CaCO3) 90 min before the combat simulation (three rounds of 2 min separated by 1 min passive recovery), in a double-blind, randomized, repeated-measures crossover design. All simulated combat was filmed to quantify the time spent fighting in each round. Lactate concentration [La-] and rating of perceived exertion (RPE) were measured before and after each round, whereas heart rate (HR) and the estimated contribution of the oxidative (WOXI), ATP (adenosine triphosphate)-phosphocreatine (PCr) (WPCR), and glycolytic (W[La-]) systems were calculated during the combat simulation. RESULTS [La-] increased significantly after NaHCO3 ingestion, when compared with the placebo condition (+14%, P = 0.04, d = 3.70). NaHCO3 ingestion resulted in greater estimated glycolytic energy contribution in the first round when compared with the placebo condition (+31%, P = 0.01, d = 3.48). Total attack time was significantly greater after NaHCO3 when compared with placebo (+13%, P = 0.05, d = 1.15). WOXI, WPCR, VO2, HR and RPE were not different between conditions (P > 0.05). CONCLUSION NaHCO3 ingestion was able to increase the contribution of glycolytic metabolism and, therefore, improve performance during simulated taekwondo combat.
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Affiliation(s)
- João Paulo Lopes-Silva
- a Martial Arts and Combat Sports Research Group, School of Physical and Education and Sport , University of São Paulo , São Paulo , Brazil
| | - Jonatas Ferreira Da Silva Santos
- a Martial Arts and Combat Sports Research Group, School of Physical and Education and Sport , University of São Paulo , São Paulo , Brazil
| | - Guilherme Giannini Artioli
- b Musculoskeletal Physiology Research Group, Sport, Health and Performance Enhancement (SHAPE) Research Centre, School of Science and Technology , Nottingham Trent University , Nottingham , UK
| | - Irineu Loturco
- c NAR-Nucleus of High Performance in Sport , São Paulo , Brazil
| | - Chris Abbiss
- d Centre for Exercise and Sport Science Research, School of Medical & Health Science , Edith Cowan University , Joondalup , Australia
| | - Emerson Franchini
- a Martial Arts and Combat Sports Research Group, School of Physical and Education and Sport , University of São Paulo , São Paulo , Brazil
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85
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Hietavala EM, Stout JR, Frassetto LA, Puurtinen R, Pitkänen H, Selänne H, Suominen H, Mero AA. Dietary acid load and renal function have varying effects on blood acid-base status and exercise performance across age and sex. Appl Physiol Nutr Metab 2017; 42:1330-1340. [PMID: 28825967 DOI: 10.1139/apnm-2017-0279] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Diet composition influences acid-base status of the body. This may become more relevant as renal functional capacity declines with aging. We examined the effects of low (LD) versus high dietary acid load (HD) on blood acid-base status and exercise performance. Participants included 22 adolescents, 33 young adults (YA), and 33 elderly (EL), who followed a 7-day LD and HD in a randomized order. At the end of both diet periods the subjects performed a cycle ergometer test (3 × 10 min at 35%, 55%, 75%, and (except EL) until exhaustion at 100% of maximal oxygen uptake). At the beginning of and after the diet periods, blood samples were collected at rest and after all workloads. Oxygen uptake, respiratory exchange ratio (RER), and heart rate (HR) were monitored during cycling. In YA and EL, bicarbonate (HCO3-) and base excess (BE) decreased over the HD period, and HCO3-, BE, and pH were lower at rest after HD compared with LD. In YA and EL women, HCO3- and BE were lower at submaximal workloads after HD compared with LD. In YA women, the maximal workload was 19% shorter and maximal oxygen uptake, RER, and HR were lower after HD compared with LD. Our data uniquely suggests that better renal function is associated with higher availability of bases, which may diminish exercise-induced acidosis and improve maximal aerobic performance. Differences in glomerular filtration rate between the subject groups likely explains the larger effects of dietary acid load in the elderly compared with younger subjects and in women compared with men.
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Affiliation(s)
- Enni-Maria Hietavala
- a Biology of Physical Activity, Faculty of Sport and Health Sciences, University of Jyväskylä, PO Box 35, 40014 Jyväskylä, Finland
| | - Jeffrey R Stout
- b Institute of Exercise Physiology and Wellness, University of Central Florida, PO Box 161250, Orlando, FL 32816-1250, USA
| | - Lynda A Frassetto
- c General Clinical Research Center, University of California San Francisco, 505 Parnassus Avenue, San Francisco, CA 94117, USA
| | - Risto Puurtinen
- a Biology of Physical Activity, Faculty of Sport and Health Sciences, University of Jyväskylä, PO Box 35, 40014 Jyväskylä, Finland
| | - Hannu Pitkänen
- d Honka Holding, c/o Honkatarhat Oy, Kirkkokallio 20, 38950 Honkajoki, Finland
| | - Harri Selänne
- e Department of Psychology, University of Jyväskylä, PO Box 35, 40014 Jyväskylä, Finland
| | - Harri Suominen
- f Health Sciences, Faculty of Sport and Health Sciences, University of Jyväskylä, PO Box 35, 40014 Jyväskylä, Finland
| | - Antti A Mero
- a Biology of Physical Activity, Faculty of Sport and Health Sciences, University of Jyväskylä, PO Box 35, 40014 Jyväskylä, Finland
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86
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Oliveira LF, de Salles Painelli V, Nemezio K, Gonçalves LS, Yamaguchi G, Saunders B, Gualano B, Artioli GG. Chronic lactate supplementation does not improve blood buffering capacity and repeated high-intensity exercise. Scand J Med Sci Sports 2016; 27:1231-1239. [DOI: 10.1111/sms.12792] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/30/2016] [Indexed: 11/27/2022]
Affiliation(s)
- L. F. Oliveira
- Applied Physiology & Nutrition Research Group; University of Sao Paulo; São Paulo Brazil
| | - V. de Salles Painelli
- Applied Physiology & Nutrition Research Group; University of Sao Paulo; São Paulo Brazil
| | - K. Nemezio
- Applied Physiology & Nutrition Research Group; University of Sao Paulo; São Paulo Brazil
| | - L. S. Gonçalves
- Applied Physiology & Nutrition Research Group; University of Sao Paulo; São Paulo Brazil
| | - G. Yamaguchi
- Applied Physiology & Nutrition Research Group; University of Sao Paulo; São Paulo Brazil
| | - B. Saunders
- Applied Physiology & Nutrition Research Group; University of Sao Paulo; São Paulo Brazil
| | - B. Gualano
- Applied Physiology & Nutrition Research Group; University of Sao Paulo; São Paulo Brazil
| | - G. G. Artioli
- Applied Physiology & Nutrition Research Group; University of Sao Paulo; São Paulo Brazil
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87
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Martin ŞA, Tomescu V, Voidăzan S. Secondary elements of blood pH variation can influence the effort effectiveness based on adaptive changes within a group of elite athletes. ACTA ACUST UNITED AC 2016; 89:506-512. [PMID: 27857520 PMCID: PMC5111491 DOI: 10.15386/cjmed-643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Revised: 02/17/2016] [Accepted: 03/18/2016] [Indexed: 11/28/2022]
Abstract
Aim pH is the direct indicator of the body reaction following the activities performed. Establishing precise correlations between pH and blood biochemical parameters might support the balancing of values during periods of marked physical activity. Method We conducted a case study in a group of elite rowers. Twelve athletes were included in the study. Monitoring was carried out by collecting biological samples several times a day: in the morning, 80 minutes pre-workout, 12 hours after the last physical effort performed, at two different times, 10 days apart. Determinations were aimed at adapting the reported biochemical parameters depending on the effort performed. The following parameters were monitored: pH, HCO3, pCO2, pO2, BE, SBE, SBC, Ca++, Mg++, LDH, GPT, T-Pro, and Alb. Results The mean value of pH found in athletes was 7.41±0.024. The value obtained was significantly correlated to biochemical parameters such as BE (2.32±1.79), SBC (1.67±1.45), SBE (2.70±1.75). However, bicarbonate (HCO3) was statistically significantly related with SBE, SBC, SBE, and pO2, but did not present a strong association with the pH value (p=0.094). However, values such as Alb, Ca++, LDH, BE, SBC are related to pH value as a result of variations in the data submitted. Conclusions The processed data evidence the fact that blood pH, in this case, is significantly influenced by a number of indices that correlate energy system activity, individual adaptation to effort, and the recovery process. The parameters under investigation (SBE, SBC, SBE, CPK, LDH) are associated with pH changes that could confirm the recovery efficiency of the athlete, along with a possible metabolic acidosis/alkalosis.
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Affiliation(s)
- Ştefan Adrian Martin
- Community Nutrition and Food Hygiene Department, University of Medicine and Pharmacy Tîrgu Mureş, Romania; Romanian Rowing Federation, University of Medicine and Pharmacy Tîrgu Mureş, Romania
| | - Valeriu Tomescu
- Romanian Olympic Sports Committee, University of Medicine and Pharmacy Tîrgu Mureş, Romania
| | - Septimiu Voidăzan
- Epidemiology Department, University of Medicine and Pharmacy Tîrgu Mureş, Romania
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88
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de Salles Painelli V, Lancha Junior AH. Thirty years of investigation on the ergogenic effects of sodium citrate: is it time for a fresh start? Br J Sports Med 2016; 52:942-943. [DOI: 10.1136/bjsports-2016-096516] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/10/2016] [Indexed: 11/03/2022]
Abstract
Sodium citrate (SCit) supplementation has been studied for several years as a strategy to reduce the muscle fatigue induced by H+ ion accumulation within the skeletal muscle during high-intensity, short-duration exercise. Several investigations have been published on this matter, and appear to indicate that SCit is not effective as an ergogenic aid, despite its ability to increase extracellular buffering capacity. In this short report, we briefly discuss the SCit results previously published in the literature and consider them in light of new and promising findings, which appear to address issues associated with previous study designs. We also suggest possible reasons for the current lack of reported ergogenic effects from this nutritional strategy and make recommendations that may re-define research in this area.
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