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Pires FO, Pinheiro FA, Brietzke C, Franco-Alvarenga PE, Veras K, de Matos ECT, Rodacki ALF, Ugrinowitsch C. Carbohydrate mouth rinse failed to reduce central fatigue, lower perceived exertion, and improve performance during incremental exercise. Front Nutr 2024; 11:1329074. [PMID: 38445204 PMCID: PMC10912157 DOI: 10.3389/fnut.2024.1329074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Accepted: 01/22/2024] [Indexed: 03/07/2024] Open
Abstract
We examined if carbohydrate (CHO) mouth rinse may reduce central fatigue and perceived exertion, thus improving maximal incremental test (MIT) performance. Nine recreational cyclists warmed up for 6 min before rinsing a carbohydrate (CHO) or placebo (PLA) solution in their mouth for 10 s in a double-blind, counterbalanced manner. Thereafter, they performed the MIT (25 W·min-1 increases until exhaustion) while cardiopulmonary and ratings of perceived exertion (RPE) responses were obtained. Pre- to post-MIT alterations in voluntary activation (VA) and peak twitch torque (Tw) were determined. Time-to-exhaustion (p = 0.24), peak power output (PPO; p = 0.45), and V̇O2MAX (p = 0.60) were comparable between conditions. Neither treatment main effect nor time-treatment interaction effect were observed in the first and second ventilatory threshold when expressed as absolute or relative V̇O2 (p = 0.78 and p = 0.96, respectively) and power output (p = 0.28 and p = 0.45, respectively) values, although with moderate-to-large effect sizes. RPE increased similarly throughout the tests and was comparable at the ventilatory thresholds (p = 0.56). Despite the time main effect revealing an MIT-induced central and peripheral fatigue as indicated by the reduced VA and Tw, CHO mouth rinse was ineffective in attenuating both fatigues. Hence, rinsing the mouth with CHO was ineffective in reducing central fatigue, lowering RPE, and improving MIT performance expressed as PPO and time-to-exhaustion. However, moderate-to-large effect sizes in power output values at VT1 and VT2 may suggest some beneficial CHO mouth rinse effects on these MIT outcomes.
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Affiliation(s)
- Flávio O. Pires
- Exercise Psychophysiology Research Group, School of Arts, Science and Humanities, University of São Paulo, São Paulo, Brazil
| | - Fabiano A. Pinheiro
- Exercise Psychophysiology Research Group, School of Arts, Science and Humanities, University of São Paulo, São Paulo, Brazil
- School of Physical Education and Sports, University of São Paulo, São Paulo, Brazil
| | - Cayque Brietzke
- Exercise Psychophysiology Research Group, School of Arts, Science and Humanities, University of São Paulo, São Paulo, Brazil
| | - Paulo Estevão Franco-Alvarenga
- Exercise Psychophysiology Research Group, School of Arts, Science and Humanities, University of São Paulo, São Paulo, Brazil
| | - Katherine Veras
- Department of Nutrition, University of Mogi das Cruzes, São Paulo, Brazil
| | | | - André L. F. Rodacki
- Department of Physical Education, Federal University of Paraná, Paraná, Brazil
| | - Carlos Ugrinowitsch
- School of Physical Education and Sports, University of São Paulo, São Paulo, Brazil
- Department of Health Sciences and Human Performance, The University of Tampa, Tampa, FL, United States
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Vasconcelos GC, Brietzke C, Cesario JCS, Douetts CDB, Canestri R, Vinicius Í, Franco-Alvarenga PE, Pires FO. No Evidence of Postactivation Performance Enhancement on Endurance Exercises: A Comprehensive Systematic Review and Meta-analysis. Med Sci Sports Exerc 2024; 56:315-327. [PMID: 37796168 DOI: 10.1249/mss.0000000000003308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/06/2023]
Abstract
PURPOSE Narrative reviews have suggested that postactivation induced by warm-up routines is effective to increase endurance exercise performance in real-world scenarios. However, systematic reviews with meta-analysis rather than narrative ones are required to provide an up-to-date summary of the evidence and provide directions for practical decisions. Therefore, we systematically reviewed peer-reviewed and gray literature to determine the certainty of evidence and the relative effects of postactivation performance enhancement (PAPE) in endurance exercises. METHODS The effects of PAPE on endurance performance were meta-analyzed as a standardized mean difference (SMD) from control conditions within a random-effects model considering polled data and subgroups (PAPE strategies, endurance test modalities, and V̇O 2max -based endurance level). RESULTS Eligible studies ( n = 35) showed a high risk of bias due to methodological flaws in randomization and blinding procedures. A meta-analysis including 57 comparisons (432 participants) revealed a significant but very small PAPE effect on endurance performance ( Z = 2.49, SMD = 0.15-very small, 95% confidence interval = 0.03 to 0.28) due to exceptional effect sizes reported by two studies (SMD of 2.85 and 2.14). We also observed that neither PAPE strategies nor endurance test modalities or V̇O 2max -based endurance levels influenced the PAPE effects on endurance performance. Meta-regression showed that PAPE effects were correlated neither with the time interval between conditioning routines and endurance exercise nor with endurance exercise duration. We found a very low certainty of evidence that PAPE potentiates endurance performance. CONCLUSIONS Based on the analyses of bias and certainty of evidence, we found no support to recommend PAPE strategies to improve endurance exercise performance. Significant but very small PAPE effects on endurance performance were due to two exceptional effect sizes.
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Affiliation(s)
| | | | - Julio Cesar Silva Cesario
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, BRAZIL
| | - Carlos Daniel Bento Douetts
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, BRAZIL
| | - Raul Canestri
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, BRAZIL
| | - Ítalo Vinicius
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, BRAZIL
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Tan SH, Khong TK, Selvanayagam VS, Yusof A. Central effects of mouth rinses on endurance and strength performance. Eur J Appl Physiol 2024; 124:403-415. [PMID: 38038740 DOI: 10.1007/s00421-023-05350-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Accepted: 10/20/2023] [Indexed: 12/02/2023]
Abstract
Rinsing the mouth with a carbohydrate (CHO) solution has been shown to enhance exercise performance while reducing neuromuscular fatigue. This effect is thought to be mediated through the stimulation of oral receptors, which activate brain areas associated with reward, motivation, and motor control. Consequently, corticomotor responsiveness is increased, leading to sustained levels of neuromuscular activity prior to fatigue. In the context of endurance performance, the evidence regarding the central involvement of mouth rinse (MR) in performance improvement is not conclusive. Peripheral mechanisms should not be disregarded, particularly considering factors such as low exercise volume, the participant's fasting state, and the frequency of rinsing. These factors may influence central activations. On the other hand, for strength-related activities, changes in motor evoked potential (MEP) and electromyography (EMG) have been observed, indicating increased corticospinal responsiveness and neuromuscular drive during isometric and isokinetic contractions in both fresh and fatigued muscles. However, it is important to note that in many studies, MEP data were not normalised, making it difficult to exclude peripheral contributions. Voluntary activation (VA), another central measure, often exhibits a lack of changes, mainly due to its high variability, particularly in fatigued muscles. Based on the evidence, MR can attenuate neuromuscular fatigue and improve endurance and strength performance via similar underlying mechanisms. However, the evidence supporting central contribution is weak due to the lack of neurophysiological measures, inaccurate data treatment (normalisation), limited generalisation between exercise modes, methodological biases (ignoring peripheral contribution), and high measurement variability.Trial registration: PROSPERO ID: CRD42021261714.
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Affiliation(s)
- Shi Han Tan
- Faculty of Sports and Exercise Science, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Teng Keen Khong
- Faculty of Sports and Exercise Science, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Victor S Selvanayagam
- Faculty of Sports and Exercise Science, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Ashril Yusof
- Faculty of Sports and Exercise Science, University of Malaya, 50603, Kuala Lumpur, Malaysia.
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de Salles Painelli V, Fernandes E, Brietzke C, Pires FO. The placebo effect of a pink non-caloric, artificially sweetened solution on strength endurance performance and psychological responses in trained individuals. Nutr Health 2023:2601060231196590. [PMID: 37608532 DOI: 10.1177/02601060231196590] [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: 08/24/2023]
Abstract
Background: The pink color enhances the perceived sweetness, increasing the individuals' expectation of the presence of sugar/carbohydrate in a beverage. Hence, it is plausible to speculate that providing a pink solution during exercise could induce an ergogenic benefit through a potential placebo effect. Aim: We examined whether ingesting a pink non-caloric, artificially sweetened solution can improve endurance strength exercise performance and psychological responses. Methods: Eighteen strength-trained individuals (34 ± 7 y; 1.74 ± 0.06 m; 79.86 ± 10.91 kg) completed three experimental trials in a randomized, single-blind, crossover counterbalanced fashion. In each trial, participants performed a 5-set strength endurance test at 70% of the one-repetition maximum in the bench press exercise, interspersed by 2 min. Before each set, participants ingested either a pink (PINK) or a transparent (TRANSP) non-caloric, artificially sweetened solution. A session without ingestion (CON) was also completed. Total number of repetitions and psychological responses such as motivation, emotional arousal, affect, and ratings of perceived exertion were obtained throughout the exercise protocol. Results: Total repetitions improved in PINK (60 ± 12 reps) compared to TRANSP (p = 0.03; 56 ± 10 reps; ES = 0.22; ±3.8%) and CON (p = 0.01; 56 ± 9 reps; ES = 0.33; ±6.6%), but no difference occurred between TRANSP and CON (p = 0.84; ES = 0.12; ±2.4%). Comparable responses were observed in motivation, emotional arousal, affect, and ratings of perceived exertion in PINK, TRANSP, and CON trials (all, p > 0.05), despite the greater total physical work performed in PINK trial. Conclusion: Ingesting a pink non-caloric, artificially sweetened solution improved strength endurance performance with comparable psychological responses. These results have implications for future nutritional studies and performance assessments in real-world sports scenarios.
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Affiliation(s)
- Vitor de Salles Painelli
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
- Strength Training Study and Research Group, Institute of Health Sciences, Paulista University, São Paulo, Brazil
| | - Edvania Fernandes
- Strength Training Study and Research Group, Institute of Health Sciences, Paulista University, São Paulo, Brazil
| | - Cayque Brietzke
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
- Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Santos, Brazil
| | - Flávio O Pires
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
- Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Santos, Brazil
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Hosang TJ, Laborde S, Löw A, Sprengel M, Baum N, Jacobsen T. How Attention Changes in Response to Carbohydrate Mouth Rinsing. Nutrients 2023; 15:3053. [PMID: 37447379 DOI: 10.3390/nu15133053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 06/28/2023] [Accepted: 07/02/2023] [Indexed: 07/15/2023] Open
Abstract
Research investigating the effects of carbohydrate (CHO) mouth rinsing on neurocognitive functions is currently limited and has yielded inconsistent results. In this study, we employed the event-related potential (ERP) electroencephalography technique to investigate the effect of CHO mouth rinsing on electrophysiological correlates of visuospatial attention. Using a double-blind, non-nutritive sweetener (NNS)-controlled, within-subjects design, 53 young adults performed a standard cognitive task (modified Simon task) on two separate days in a fasted state (16 h). Intermittently, mouth rinsing was performed either with a CHO (glucose, 18%, 30 mL) or an NNS solution (aspartame, 0.05%, 30 mL). Results revealed that relative to NNS, electrophysiological correlates of both more bottom-up controlled visuospatial attention (N1pc-ERP component) were decreased in response to CHO rinsing. In contrast, compared to NNS, more top-down controlled visuospatial attention (N2pc-ERP component) was increased after CHO rinsing. Behavioral performance, however, was not affected by mouth rinsing. Our findings suggest that orosensory signals can impact neurocognitive processes of visuospatial attention in a fasted state. This may suggest a central mechanism underlying the ergogenic effects of carbohydrate mouth rinsing on endurance performance could involve modulations of attentional factors. Methodologically, our study underlines that understanding the effects of carbohydrate mouth rinsing at the central level may require combining neuroscientific methods and manipulations of nutritional states.
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Affiliation(s)
- Thomas J Hosang
- Experimental Psychology Unit, Faculty of Humanities and Social Sciences, Helmut Schmidt University/University of the Federal Armed Forces Hamburg, 22043 Hamburg, Germany
- Department of Performance Psychology, Institute of Psychology, German Sport University Cologne, 50933 Cologne, Germany
| | - Sylvain Laborde
- Department of Performance Psychology, Institute of Psychology, German Sport University Cologne, 50933 Cologne, Germany
| | - Andreas Löw
- Experimental Psychology Unit, Faculty of Humanities and Social Sciences, Helmut Schmidt University/University of the Federal Armed Forces Hamburg, 22043 Hamburg, Germany
| | - Michael Sprengel
- Experimental Psychology Unit, Faculty of Humanities and Social Sciences, Helmut Schmidt University/University of the Federal Armed Forces Hamburg, 22043 Hamburg, Germany
| | - Niels Baum
- Department of Performance Psychology, Institute of Psychology, German Sport University Cologne, 50933 Cologne, Germany
| | - Thomas Jacobsen
- Experimental Psychology Unit, Faculty of Humanities and Social Sciences, Helmut Schmidt University/University of the Federal Armed Forces Hamburg, 22043 Hamburg, Germany
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Nabuco LL, Mendes GF, Barreto G, Saunders B, Reis CEG. Spit It Out: Is Caffeine Mouth Rinse an Effective Ergogenic Aid? A Systematic Review and Meta-Analysis. Strength Cond J 2023. [DOI: 10.1519/ssc.0000000000000777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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Carbohydrate mouth rinsing decreases perception of effort but does not enhance the performance of older male runners. GERMAN JOURNAL OF EXERCISE AND SPORT RESEARCH 2023. [DOI: 10.1007/s12662-022-00869-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Budnick CJ, Stults-Kolehmainen M, Dadina C, Bartholomew JB, Boullosa D, Ash GI, Sinha R, Blacutt M, Haughton A, Lu T. Motivation states to move, be physically active and sedentary vary like circadian rhythms and are associated with affect and arousal. Front Sports Act Living 2023; 5:1094288. [PMID: 37143586 PMCID: PMC10151587 DOI: 10.3389/fspor.2023.1094288] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 03/16/2023] [Indexed: 05/06/2023] Open
Abstract
Introduction Motivation to be physically active and sedentary is a transient state that varies in response to previous behavior. It is not known: (a) if motivational states vary from morning to evening, (b) if they are related to feeling states (arousal/hedonic tone), and (c) whether they predict current behavior and intentions. The primary purpose of this study was to determine if motivation states vary across the day and in what pattern. Thirty adults from the United States were recruited from Amazon MTurk. Methods Participants completed 6 identical online surveys each day for 8 days beginning after waking and every 2-3 h thereafter until bedtime. Participants completed: (a) the CRAVE scale (Right now version) to measure motivation states for Move and Rest, (b) Feeling Scale, (c) Felt Arousal Scale, and (d) surveys about current movement behavior (e.g., currently sitting, standing, laying down) and intentions for exercise and sleep. Of these, 21 participants (mean age 37.7 y; 52.4% female) had complete and valid data. Results Visual inspection of data determined that: a) motivation states varied widely across the day, and b) most participants had a single wave cycle each day. Hierarchical linear modelling revealed that there were significant linear and quadratic time trends for both Move and Rest. Move peaked near 1500 h when Rest was at its nadir. Cosinor analysis determined that the functional waveform was circadian for Move for 81% of participants and 62% for Rest. Pleasure/displeasure and arousal independently predicted motivation states (all p's < .001), but arousal had an association twice as large. Eating, exercise and sleep behaviors, especially those over 2 h before assessment, predicted current motivation states. Move-motivation predicted current body position (e.g., laying down, sitting, walking) and intentions for exercise and sleep more consistently than rest, with the strongest prediction of behaviors planned for the next 30 min. Discussion While these data must be replicated with a larger sample, results suggest that motivation states to be active or sedentary have a circadian waveform for most people and influence future behavioral intentions. These novel results highlight the need to rethink the traditional approaches typically utilized to increase physical activity levels.
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Affiliation(s)
- Christopher J. Budnick
- Department of Psychology, Southern Connecticut State University, New Haven, CT, United States
| | - Matthew Stults-Kolehmainen
- Division of Digestive Health, Yale New Haven Hospital, New Haven, CT, United States
- Department of Biobehavioral Sciences, Teachers College—Columbia University, New York, NY, United States
- Correspondence: Matthew Stults-Kolehmainen
| | - Cyrus Dadina
- Science Research Program, Dobbs Ferry High School, Dobbs Ferry, NY, United States
| | - John B. Bartholomew
- Department of Kinesiology and Health Education, The University of Texas at Austin, Austin, TX, United States
| | - Daniel Boullosa
- Faculty of Physical Activity and Sports Sciences, Universidad de León, León, Spain
- College of Healthcare Sciences, James Cook University, Townsville, Australia
- Graduate Program in Movement Sciences, Integrated Institute of Health, Federal University of Mato Grosso do Sul, Campo Grande, Brazil
| | - Garret I. Ash
- Center for Pain, Research, Informatics, Medical Comorbidities and Education Center (PRIME), VA Connecticut Healthcare System, West Haven, CT, United States
- Center for Medical Informatics, Yale School of Medicine, New Haven, CT, United States
| | - Rajita Sinha
- Department of Psychiatry, Yale Medical School, New Haven, CT, United States
| | - Miguel Blacutt
- Department of Psychology, University of Notre Dame, Notre Dame, IN, United States
| | - Adrian Haughton
- Patel College of Osteopathic Medicine, Nova Southeastern University, Fort Lauderdale, FL, United States
| | - Tom Lu
- Department of Mathematics and Statistics, Texas Tech University, Lubbock, TX, United States
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Fortes LS, Ferreira MEC, Faro H, Penna EM, Almeida SS. Brain Stimulation Over the Motion-Sensitive Midtemporal Area Reduces Deleterious Effects of Mental Fatigue on Perceptual-Cognitive Skills in Basketball Players. JOURNAL OF SPORT & EXERCISE PSYCHOLOGY 2022; 44:272-285. [PMID: 35613846 DOI: 10.1123/jsep.2021-0281] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 02/25/2022] [Accepted: 04/05/2022] [Indexed: 06/15/2023]
Abstract
The objective of this study was to analyze the effect of anodal transcranial direct current stimulation (a-tDCS) over the motion-sensitive midtemporal area on perceptual-cognitive skills (visuomotor and basketball decision-making skills) in mentally fatigued basketball players. A total of 20 male basketball players were recruited. This was a randomized, double-blinded, and counterbalanced crossover study with two experimental conditions: a-tDCS and Sham. The participants completed the basketball decision-making task and visuomotor skill after performing a 60-min sport-based videogame task with anodal (i.e., a-tDCS) or placebo (Sham) stimulation over the motion-sensitive middle temporal area. Worse response time was observed in visuomotor skill for Sham than a-tDCS postexperiment (p < .05). There was no main condition effect for accuracy of visuomotor skill (p > .05). There was more impairment in accuracy and response time in basketball decision-making skills for the Sham condition than a-tDCS (p < .05). Notably, a-tDCS over the motion-sensitive middle temporal area removed the negative effects of mental fatigue on perceptual-cognitive skills.
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Affiliation(s)
- Leonardo S Fortes
- Associate Graduate Program of Physical Education, Federal University of Paraíba, Joao Pessoa,Brazil
| | - Maria E C Ferreira
- Graduate Program of Physical Education, Federal University of Juiz de Fora, Juiz de Fora,Brazil
| | - Heloiana Faro
- Associate Graduate Program of Physical Education, Federal University of Paraíba, Joao Pessoa,Brazil
| | - Eduardo M Penna
- Graduate Program of Human Movement Science, Federal University of Pará, Belem,Brazil
| | - Sebastião S Almeida
- Environment Determinants Research Group, University of São Paulo, Ribeirao Preto,Brazil
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Lopes-Silva JP, Correia-Oliveira CR. Acute effects of sodium bicarbonate ingestion on cycling time-trial performance: A systematic review and meta-analysis of randomized controlled trials. Eur J Sport Sci 2022; 23:943-954. [PMID: 35633035 DOI: 10.1080/17461391.2022.2071171] [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: 11/03/2022]
Abstract
This study aimed to investigate the isolated effects of NaHCO3 on cycling time-trial performance. Furthermore, we investigated whether the ingestion time of NaHCO3, standardized or individualized based on time to peak, could be effective in improving cycling time-trial performance. A systematic review was carried out on randomized placebo-controlled studies. A random-effects meta-analysis assessed the standardized mean difference (SMD) between NaHCO3 and placebo conditions. Eighteen studies were qualitatively (systematic review) and quantitatively (meta-analysis) analysed concerning mean power output (Wmean) (n = 182) and time performance (n = 201). The reviewed studies showed a low risk of bias and homogenous results for Wmean (I2 = 0%) and performance time (I2 = 0%). Overall, when compared to placebo, the NaHCO3 ingestion improved the Wmean (SMD: 0.42; 95% CI: 0.21-0.63; P = 0.001) and performance time (SMD: 0.22; 95% CI: 0.02-0.43; P = 0.03). Similarly, the NaHCO3 ingestion using a time-to-peak strategy improved the Wmean (SMD: 0.39; 95% CI: 0.03-0.75; P = 0.04; I2 = 15%) and performance time (SMD: 0.34; 95% CI: 0.07-0.61, P = 0.01, I2 = 0%). The present findings reveal that NaHCO3 ingestion has the potential to increase the overall performance time and Wmean in cycling time trials. HighlightsNaHCO3 is an effective strategy to increase cycling time-trial performance.The standardized protocol did not improve the cycling time-trial performance parameters.The individualized time-to-peak NaHCO3 ingestion has a positive effect on time and Wmean during cycling time-trial performance.
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Affiliation(s)
- João Paulo Lopes-Silva
- Applied Research Group to Performance and Health, CESMAC University Center, Maceió, Brazil
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Painelli VDS, Brietzke C, Franco-Alvarenga PE, Canestri R, Vinícius Í, Pires FO. A Narrative Review of Current Concerns and Future Perspectives of the Carbohydrate Mouth Rinse Effects on Exercise Performance. SAGE Open Med 2022; 10:20503121221098120. [PMID: 35615525 PMCID: PMC9125602 DOI: 10.1177/20503121221098120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Accepted: 04/13/2022] [Indexed: 11/16/2022] Open
Abstract
Previous systematic reviews have confirmed that carbohydrate (CHO) mouth rinse
may boost physical exercise performance, despite some methodological aspects
likely affecting its ergogenic effect. In this review, we discussed if the
exercise mode, pre-exercise fasting status, CHO solutions concentration, CHO
solutions temperature, mouth rinse duration, and CHO placebo effects may
potentially reduce the CHO mouth rinse ergogenic effect, suggesting possible
solutions to manage these potential confounders. The effectiveness of CHO mouth
rinse as a performance booster is apparently related to the origin of the
exercise-induced neuromuscular fatigue, as CHO mouth rinse unequivocally
potentiates endurance rather than sprint and strength exercises performance.
Furthermore, ergogenic effects have been greater in fasting than fed state,
somehow explaining the varied magnitude of the CHO mouth rinse effects in
exercise performance. In this regard, the CHO solution concentration and
temperature, as well as the mouth rinse duration, may have increased the
variability observed in CHO mouth rinse effects in fasting and fed state.
Finally, placebo effects have challenged the potential of the CHO mouth rinse as
an ergogenic aid. Therefore, we suggest that future studies should consider
methodological controls such as sample size and sample homogeneity, proper
familiarization with experimental procedures, and the use of alternative placebo
designs to provide unbiased evidence regarding the potential of the CHO mouth
rinse as an ergogenic aid.
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Affiliation(s)
- Vitor de Salles Painelli
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
- Strength Training Study and Research Group, Institute of Health Sciences, Paulista University, São Paulo, Brazil
| | - Cayque Brietzke
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
- Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Santos, Brazil
| | - Paulo Estevão Franco-Alvarenga
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
- Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Santos, Brazil
| | - Raul Canestri
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
| | - Ítalo Vinícius
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
| | - Flávio Oliveira Pires
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
- Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Santos, Brazil
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Crosby S, Butcher A, McDonald K, Berger N, Bekker PJ, Best R. Menthol Mouth Rinsing Maintains Relative Power Production during Three-Minute Maximal Cycling Performance in the Heat Compared to Cold Water and Placebo Rinsing. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19063527. [PMID: 35329209 PMCID: PMC8949398 DOI: 10.3390/ijerph19063527] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 03/07/2022] [Accepted: 03/13/2022] [Indexed: 11/16/2022]
Abstract
Previous menthol studies have demonstrated ergogenic effects in endurance-based activity. However, there is a need for research in sports whose physiological requirements exceed maximal aerobic capacity. This study assessed the effects of 0.1% menthol mouth-rinsing upon a modified three-minute maximal test in the heat (33.0 ± 3.0 °C; RH 46.0 ± 5.0%). In a randomised crossover single blind placebo-controlled study, 11 participants completed three modified maximal tests, where each trial included a different mouth rinse: either menthol (MEN), cold water (WAT) or placebo (PLA). Participants were asked to rate their thermal comfort (TC), thermal sensation (TS) and rating of perceived exertion (RPE) throughout the test. Heart rate, core temperature, oxygen uptake (VO2), ventilation (VE) and respiratory exchange ratio (RER) were monitored continuously throughout the test, alongside cycling power variables (W; W/kg). A blood lactate (BLa) level was taken pre- and post- test. Small to moderate effects (Cohen's d and accompanying 90% confidence intervals) between solutions MEN, WAT and PLA were observed towards the end of the test in relation to relative power. Specifically, from 75-105 s between solutions MEN and WAT (ES: 0.795; 90% CI: 0.204 to 1.352) and MEN and PLA (ES: 1.059; 90% CI: 0.412 to 1.666), this continued between MEN and WAT (ES: 0.729; 90% CI: 0.152 to 1.276) and MEN and PLA (ES: 0.791; 90% CI: 0.202 to 1.348) from 105-135 s. Between 135-165 s there was a moderate difference between solutions MEN and WAT (ES: 1.058; 90% CI: 0.411 to 1.665). This indicates participants produced higher relative power for longer durations with the addition of the menthol mouth rinse, compared to cold water or placebo. The use of menthol (0.1%) as a mouth rinse showed small performance benefits for short duration high intensity exercise in the heat.
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Affiliation(s)
- Seana Crosby
- Centre for Sport Science & Human Performance, Waikato Institute of Technology, Hamilton 3200, New Zealand; (S.C.); (A.B.); (K.M.); (P.J.B.)
| | - Anna Butcher
- Centre for Sport Science & Human Performance, Waikato Institute of Technology, Hamilton 3200, New Zealand; (S.C.); (A.B.); (K.M.); (P.J.B.)
| | - Kerin McDonald
- Centre for Sport Science & Human Performance, Waikato Institute of Technology, Hamilton 3200, New Zealand; (S.C.); (A.B.); (K.M.); (P.J.B.)
| | - Nicolas Berger
- School of Health and Life Sciences, Teesside University, Middlesbrough TS1 3BX, UK;
| | - Petrus J. Bekker
- Centre for Sport Science & Human Performance, Waikato Institute of Technology, Hamilton 3200, New Zealand; (S.C.); (A.B.); (K.M.); (P.J.B.)
| | - Russ Best
- Centre for Sport Science & Human Performance, Waikato Institute of Technology, Hamilton 3200, New Zealand; (S.C.); (A.B.); (K.M.); (P.J.B.)
- Correspondence:
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13
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Hartley C, Carr A, Bowe SJ, Bredie WLP, Keast RSJ. Maltodextrin-Based Carbohydrate Oral Rinsing and Exercise Performance: Systematic Review and Meta-Analysis. Sports Med 2022; 52:1833-1862. [PMID: 35239154 PMCID: PMC9325805 DOI: 10.1007/s40279-022-01658-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/01/2022] [Indexed: 12/04/2022]
Abstract
Background Carbohydrates are an important fuel for optimal exercise performance during moderate- and high-intensity exercise; however, carbohydrate ingestion during high-intensity exercise may cause gastrointestinal upset. A carbohydrate oral rinse is an alternative method to improve exercise performance in moderate- to high-intensity exercise with a duration of 30–75 min. This is the first systematic review and meta-analysis to comprehensively examine the isolated effect of maltodextrin-based rinsing on exercise performance. Objective The objective of this review was to establish the effect of a maltodextrin-based carbohydrate oral rinse on exercise performance across various modes of exercise. Furthermore, a secondary objective was to determine the effects of moderators [(1) participant characteristics; (2) oral rinse protocols; (3) exercise protocol (i.e. cycling, running etc.) and (4) fasting] on exercise performance while using a maltodextrin-based, carbohydrate oral rinse. Methods Five databases (MEDLINE, PsycINFO, Embase, SPORTDiscus and Global Health) were systematically searched for articles up to March 2021 and screened using Covidence (a systematic review management tool). A random effects robust meta-analysis and subgroup analyses were performed using Stata Statistical Software: Release 16. Results Thirty-five articles met the inclusion criteria and were included in the systematic review; 34 of these articles were included in the meta-analysis. When using a conventional meta-analytic approach, overall, a carbohydrate oral rinse improved exercise performance in comparison with a placebo (SMD = 0.15, 95% CI 0.04, 0.27; p = 0.01). Furthermore, when implementing an adjusted, conservative, random effects meta-regression model using robust variance estimation, overall, compared with placebo, a carbohydrate oral rinse demonstrated evidence of improving exercise performance with a small effect size (SMD = 0.17, 95% CI − 0.01, 0.34; p = 0.051). Conclusion This systematic review and meta-analysis demonstrates that a maltodextrin-based carbohydrate oral rinse can improve exercise performance. When comparing the two meta-analytic approaches, although non-significant, the more robust, adjusted, random effects meta-regression model demonstrated some evidence of a maltodextrin-based carbohydrate oral rinse improving exercise performance overall. Supplementary Information The online version contains supplementary material available at 10.1007/s40279-022-01658-3.
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Affiliation(s)
- Claudia Hartley
- CASS Food Research Centre, Deakin University, 221 Burwood Highway, Burwood, VIC, 3125, Australia
| | - Amelia Carr
- Centre for Sport Research, Deakin University, 221 Burwood Highway, Burwood, VIC, 3125, Australia
| | - Steven J Bowe
- Deakin Biostatistics Unit, Faculty of Health, Deakin University, 221 Burwood Highway, Burwood, VIC, 3125, Australia
| | - Wender L P Bredie
- Department of Food Science, University of Copenhagen, Rolighedsvej 26, 1958, Frederiksberg, Denmark
| | - Russell S J Keast
- CASS Food Research Centre, Deakin University, 221 Burwood Highway, Burwood, VIC, 3125, Australia.
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14
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Best R, Crosby S, Berger N, McDonald K. The Effect of Isolated and Combined Application of Menthol and Carbohydrate Mouth Rinses on 40 km Time Trial Performance, Physiological and Perceptual Measures in the Heat. Nutrients 2021; 13:4309. [PMID: 34959861 PMCID: PMC8708984 DOI: 10.3390/nu13124309] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 11/24/2021] [Accepted: 11/28/2021] [Indexed: 01/31/2023] Open
Abstract
The current study compared mouth swills containing carbohydrate (CHO), menthol (MEN) or a combination (BOTH) on 40 km cycling time trial (TT) performance in the heat (32 °C, 40% humidity, 1000 W radiant load) and investigates associated physiological (rectal temperature (Trec), heart rate (HR)) and subjective measures (thermal comfort (TC), thermal sensation (TS), thirst, oral cooling (OC) and RPE (legs and lungs)). Eight recreationally trained male cyclists (32 ± 9 y; height: 180.9 ± 7.0 cm; weight: 76.3 ± 10.4 kg) completed familiarisation and three experimental trials, swilling either MEN, CHO or BOTH at 10 km intervals (5, 15, 25, 35 km). The 40 km TT performance did not differ significantly between conditions (F2,14 = 0.343; p = 0.715; η2 = 0.047), yet post-hoc testing indicated small differences between MEN and CHO (d = 0.225) and MEN and BOTH (d = 0.275). Subjective measures (TC, TS, RPE) were significantly affected by distance but showed no significant differences between solutions. Within-subject analysis found significant interactions between solution and location upon OC intensity (F28,196 = 2.577; p < 0.001; η2 = 0.269). While solutions containing MEN resulted in a greater sensation of OC, solutions containing CHO experienced small improvements in TT performance. Stimulation of central CHO pathways during self-paced cycling TT in the heat may be of more importance to performance than perceptual cooling interventions. However, no detrimental effects are seen when interventions are combined.
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Affiliation(s)
- Russ Best
- Centre for Sports Science and Human Performance, Waikato Institute of Technology, Hamilton 3200, New Zealand; (S.C.); (K.M.)
| | - Seana Crosby
- Centre for Sports Science and Human Performance, Waikato Institute of Technology, Hamilton 3200, New Zealand; (S.C.); (K.M.)
| | - Nicolas Berger
- School of Health and Life Sciences, Teesside University, Middlesbrough TS1 3BX, UK;
| | - Kerin McDonald
- Centre for Sports Science and Human Performance, Waikato Institute of Technology, Hamilton 3200, New Zealand; (S.C.); (K.M.)
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15
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Bourdas DI, Souglis A, Zacharakis ED, Geladas ND, Travlos AK. Meta-Analysis of Carbohydrate Solution Intake during Prolonged Exercise in Adults: From the Last 45+ Years' Perspective. Nutrients 2021; 13:4223. [PMID: 34959776 PMCID: PMC8704222 DOI: 10.3390/nu13124223] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 11/02/2021] [Accepted: 11/22/2021] [Indexed: 12/17/2022] Open
Abstract
Carbohydrate (CHO) supplementation during prolonged exercise postpones fatigue. However, the optimum administration timing, dosage, type of CHO intake, and possible interaction of the ergogenic effect with athletes' cardiorespiratory fitness (CRF) are not clear. Ninety-six studies (from relevant databases based on predefined eligibility criteria) were selected for meta-analysis to investigate the acute effect of ≤20% CHO solutions on prolonged exercise performance. The between-subject standardized mean difference [SMD = ([mean post-value treatment group-mean post-value control group]/pooled variance)] was assessed. Overall, SMD [95% CI] of 0.43 [0.35, 0.51] was significant (p < 0.001). Subgroup analysis showed that SMD was reduced as the subjects' CRF level increased, with a 6-8% CHO solution composed of GL:FRU improving performance (exercise: 1-4 h); administration during the event led to a superior performance compared to administration before the exercise, with a 6-8% single-source CHO solution increasing performance in intermittent and 'stop and start' sports and an ~6% CHO solution appearing beneficial for 45-60 min exercises, but there were no significant differences between subjects' gender and age groups, varied CHO concentrations, doses, or types in the effect measurement. The evidence found was sound enough to support the hypothesis that CHO solutions, when ingested during endurance exercise, have ergogenic action and a possible crossover interaction with the subject's CRF.
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Affiliation(s)
- Dimitrios I. Bourdas
- Section of Sport Medicine & Biology of Exercise, School of Physical Education and Sports Science, National and Kapodistrian University of Athens, 41 Ethnikis Antistasis, 17237 Athens, Greece;
| | - Athanasios Souglis
- Section of Didactics and Coaching in Sport Games, School of Physical Education & Sport Science, National and Kapodistrian University of Athens, 41 Ethnikis Antistasis, 17237 Athens, Greece; (A.S.); (E.D.Z.)
| | - Emmanouil D. Zacharakis
- Section of Didactics and Coaching in Sport Games, School of Physical Education & Sport Science, National and Kapodistrian University of Athens, 41 Ethnikis Antistasis, 17237 Athens, Greece; (A.S.); (E.D.Z.)
| | - Nickos D. Geladas
- Section of Sport Medicine & Biology of Exercise, School of Physical Education and Sports Science, National and Kapodistrian University of Athens, 41 Ethnikis Antistasis, 17237 Athens, Greece;
| | - Antonios K. Travlos
- Department of Sports Organization and Management, Faculty of Human Movement and Quality of Life Sciences, University of Peloponnese, Efstathiou and Stamatikis Valioti & Plataion Avenue, 23100 Tripoli, Greece;
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16
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Nutrition and indoor cycling: a cross-sectional analysis of carbohydrate intake for online racing and training. Br J Nutr 2021; 127:1204-1213. [PMID: 34080530 DOI: 10.1017/s0007114521001860] [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: 11/06/2022]
Abstract
Cycling is a sport characterised by high training load, and adequate nutrition is essential for training and race performance. With the increased popularity of indoor trainers, cyclists have a unique opportunity to practice and implement key nutritional strategies. This study aimed to assess carbohydrate (CHO) intake of cyclists training or racing in this unique scenario for optimising exercise nutrition. A mixed-methods approach consisting of a multiple-pass self-report food recall and questionnaire was used to determine total CHO intake pre, during and post-training or racing using a stationary trainer and compared with current guidelines for endurance exercise. Sub-analyses were also made for higher ability cyclists (>4 W/kg functional threshold power), races v. non-races and 'key' training sessions. Mean CHO intake pre and post-ride was 0·7 (sd 0·6) and 1·0 (sd 0·8) g kg/BM and 39·3 (sd 27·5) g/h during training. CHO intake was not different for races (pre/during/post, P = 0·31, 0·23, 0·18, respectively), 'key sessions' (P = 0·26, 0·89, 0·98) or higher ability cyclists (P = 0·26, 0·76, 0·45). The total proportion of cyclists who failed to meet CHO recommendations was higher than those who met guidelines (pre = 79 %, during = 86 %, post = 89 %). Cyclists training or racing indoors do not meet current CHO recommendations for cycling performance. Due to the short and frequently high-intensity nature of some sessions, opportunity for during exercise feeding may be limited or unnecessary.
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17
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Brown DR, Cappozzo F, De Roeck D, Zariwala MG, Deb SK. Mouth Rinsing With a Pink Non-caloric, Artificially-Sweetened Solution Improves Self-Paced Running Performance and Feelings of Pleasure in Habitually Active Individuals. Front Nutr 2021; 8:678105. [PMID: 34055861 PMCID: PMC8153227 DOI: 10.3389/fnut.2021.678105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 04/15/2021] [Indexed: 11/26/2022] Open
Abstract
Purpose: The purpose of this study was to investigate whether mouth rinsing with a pink non-caloric, artificially sweetened solution can improve self-selected running speed and distance covered during a 30 min running protocol. Methods: Ten healthy and habitually active individuals (six males, four females) completed two experimental trials in a randomised, single-blind, crossover design. Each experimental trial consisted of a 30 min treadmill run at a self-selected speed equivalent to 15 (hard/heavy) on the rating of perceived exertion scale. During exercise, participants mouth rinsed with either a pink or a clear non-caloric, artificially sweetened solution, with performance, perceptual and physiological measures obtained throughout. Results: Self-selected running speed (+0.4 ± 0.5 km·h−1, p = 0.024, g = 0.25) and distance covered (+213 ± 247 m, p = 0.023, g = 0.25) during the 30 min running protocol were both improved by 4.4 ± 5.1% when participants mouth rinsed with the pink solution when compared to the clear solution. Feelings of pleasure were also enhanced during the 30 min treadmill run when participants mouth rinsed with the pink solution, with ratings increased from 3.4 ± 0.7 in the clear condition to 3.8 ± 0.6 in the pink condition (+0.4 ± 0.5, p = 0.046, g = 0.54). Conclusion: Mouth rinsing with a pink non-caloric, artificially sweetened solution improved self-selected running speed, total distance covered, and feelings of pleasure obtained during a 30 min running protocol when compared to an isocaloric and taste-matched clear solution.
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Affiliation(s)
- Daniel R Brown
- Department of Higher Education Sport, Loughborough College, Loughborough, United Kingdom
| | - Francesca Cappozzo
- Centre for Nutraceuticals, School of Life Sciences, University of Westminster, Westminster, United Kingdom
| | - Dakota De Roeck
- Centre for Nutraceuticals, School of Life Sciences, University of Westminster, Westminster, United Kingdom
| | - Mohammed Gulrez Zariwala
- Centre for Nutraceuticals, School of Life Sciences, University of Westminster, Westminster, United Kingdom
| | - Sanjoy K Deb
- Centre for Nutraceuticals, School of Life Sciences, University of Westminster, Westminster, United Kingdom
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18
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Rollo I, Gonzalez JT, Fuchs CJ, van Loon LJC, Williams C. Primary, Secondary, and Tertiary Effects of Carbohydrate Ingestion During Exercise. Sports Med 2021; 50:1863-1871. [PMID: 32936440 PMCID: PMC8159838 DOI: 10.1007/s40279-020-01343-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The purpose of this current opinion paper is to describe the journey of ingested carbohydrate from 'mouth to mitochondria' culminating in energy production in skeletal muscles during exercise. This journey is conveniently described as primary, secondary, and tertiary events. The primary stage is detection of ingested carbohydrate by receptors in the oral cavity and on the tongue that activate reward and other centers in the brain leading to insulin secretion. After digestion, the secondary stage is the transport of monosaccharides from the small intestine into the systemic circulation. The passage of these monosaccharides is facilitated by the presence of various transport proteins. The intestinal mucosa has carbohydrate sensors that stimulate the release of two 'incretin' hormones (GIP and GLP-1) whose actions range from the secretion of insulin to appetite regulation. Most of the ingested carbohydrate is taken up by the liver resulting in a transient inhibition of hepatic glucose release in a dose-dependent manner. Nonetheless, the subsequent increased hepatic glucose (and lactate) output can increase exogenous carbohydrate oxidation rates by 40-50%. The recognition and successful distribution of carbohydrate to the brain and skeletal muscles to maintain carbohydrate oxidation as well as prevent hypoglycaemia underpins the mechanisms to improve exercise performance.
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Affiliation(s)
- Ian Rollo
- Gatorade Sports Science Institute, PepsiCo Life Sciences, Global R&D, Leicestershire, UK. .,School of Sports Exercise and Health Sciences, Loughborough University, Loughborough, UK.
| | | | - Cas J Fuchs
- Department of Human Biology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Luc J C van Loon
- Department of Human Biology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Clyde Williams
- School of Sports Exercise and Health Sciences, Loughborough University, Loughborough, UK
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19
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Macronutrient Sensing in the Oral Cavity and Gastrointestinal Tract: Alimentary Tastes. Nutrients 2021; 13:nu13020667. [PMID: 33669584 PMCID: PMC7922037 DOI: 10.3390/nu13020667] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 02/09/2021] [Accepted: 02/16/2021] [Indexed: 02/07/2023] Open
Abstract
There are numerous and diverse factors enabling the overconsumption of foods, with the sense of taste being one of these factors. There are four well established basic tastes: sweet, sour, salty, and bitter; all with perceptual independence, salience, and hedonic responses to encourage or discourage consumption. More recently, additional tastes have been added to the basic taste list including umami and fat, but they lack the perceptual independence and salience of the basics. There is also emerging evidence of taste responses to kokumi and carbohydrate. One interesting aspect is the link with the new and emerging tastes to macronutrients, with each macronutrient having two distinct perceptual qualities that, perhaps in combination, provide a holistic perception for each macronutrient: fat has fat taste and mouthfeel; protein has umami and kokumi; carbohydrate has sweet and carbohydrate tastes. These new tastes can be sensed in the oral cavity, but they have more influence post- than pre-ingestion. Umami, fat, kokumi, and carbohydrate tastes have been suggested as an independent category named alimentary. This narrative review will present and discuss evidence for macronutrient sensing throughout the alimentary canal and evidence of how each of the alimentary tastes may influence the consumption of foods.
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20
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Influence of Trehalose Mouth Rinse on Anaerobic and Aerobic Exercise Performance. Nat Prod Commun 2020. [DOI: 10.1177/1934578x20969594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Trehalose is a disaccharide consisting of 2 glucose units linked in an alpha 1,1-glycosidic bond. Pre-exercise trehalose ingestion enhances exercise performance within 30 minutes. Enhanced performance was hypothesized to be due to a mouth rinse effect. A 3-arm double-blind crossover trial was conducted to test this hypothesis. Ten healthy male collegiate distance runners rinsed their mouths with either trehalose (6% w/v) or maltose (6% w/v) or acesulfame potassium (0.04 mg/mL) for 5 seconds and then performed an exercise assessment composed of 6-second peak power and endurance tests. Trehalose induced the highest mean power output ( P < .01) in peak power tests. In the endurance test, trehalose consistently showed higher mean power output than maltose. The 3 test drinks displayed indistinguishable sweetness and were expected to activate receptors for sweetness (T1R2-T1R3) with the same intensity. Trehalose activates taste receptors T1R1-T1R3, T1R3-T1R3 homodimer, and T1R2-T1R3, whereas sucrose activates only T1R2-T1R3. Therefore, a difference in mouth rinse effect might be due to a specific receptor in the oral cavity that recognizes differences between trehalose and maltose.
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21
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Comment on: "Effects of Carbohydrate Mouth Rinse on Cycling Time Trial Performance: A Systematic Review and Meta-analysis" and Subsequent Comment/Author Reply from Li et al. Sports Med 2020; 50:629-632. [PMID: 31696450 DOI: 10.1007/s40279-019-01216-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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22
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Park C, Pagnini F, Langer E. Glucose metabolism responds to perceived sugar intake more than actual sugar intake. Sci Rep 2020; 10:15633. [PMID: 32973226 PMCID: PMC7515886 DOI: 10.1038/s41598-020-72501-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Accepted: 08/18/2020] [Indexed: 12/05/2022] Open
Abstract
The authors examine study participants who have Type 2 diabetes to determine whether cognition affects glucose levels in contrast to widely held suppositions. Thirty participants who have type 2 diabetes consume beverages that have identical ingredients but have deceptive nutrition facts labels. Blood glucose levels measured four times before and after beverage consumption show that blood glucose levels increase when participants believe the beverage has high sugar content as portrayed on the labels. Also, individual eating behaviors and nutritional satisfaction are linked to changes in blood glucose levels. The study results support the concept of anticipatory budgeting on glucose metabolism. The findings provide pressing evidence for the psychobiological model of chronic disease, suggesting that psychological intervention programs may be important for diabetes management, beyond current programs in which type 2 diabetes is managed through diet, exercise, and medications only.
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Affiliation(s)
- Chanmo Park
- Department of Psychology, Harvard University, 33 Kirkland St, Cambridge, MA, 02138, USA.
| | - Francesco Pagnini
- Department of Psychology, Harvard University, 33 Kirkland St, Cambridge, MA, 02138, USA.,Department of Psychology, Università Cattolica del Sacro Cuore, Milan, Italy
| | - Ellen Langer
- Department of Psychology, Harvard University, 33 Kirkland St, Cambridge, MA, 02138, USA
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23
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The Effects of Caffeine Mouth Rinsing on Exercise Performance: A Systematic Review. Int J Sport Nutr Exerc Metab 2020; 30:362-373. [DOI: 10.1123/ijsnem.2020-0083] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 05/13/2020] [Accepted: 06/05/2020] [Indexed: 11/18/2022]
Abstract
Caffeine ingestion can improve performance across a variety of exercise modalities but can also elicit negative side effects in some individuals. Thus, there is a growing interest in the use of caffeine mouth rinse solutions to improve sport and exercise performance while minimizing caffeine’s potentially adverse effects. Mouth rinse protocols involve swilling a solution within the oral cavity for a short time (e.g., 5–10 s) before expectorating it to avoid systemic absorption. This is believed to improve performance via activation of taste receptors and stimulation of the central nervous system. Although reviews of the literature indicate that carbohydrate mouth rinsing can improve exercise performance in some situations, there has been no attempt to systematically review the available literature on caffeine mouth rinsing and its effects on exercise performance. To fill this gap, a systematic literature search of three databases (PubMed, SPORTDiscus, and Web of Science) was conducted by two independent reviewers. The search resulted in 11 randomized crossover studies that were appraised and reviewed. Three studies found significant positive effects of caffeine mouth rinsing on exercise performance, whereas the remaining eight found no improvements or only suggestive benefits. The mixed results may be due to heterogeneity in the methods across studies, interindividual differences in bitter tasting, and differences in the concentrations of caffeine solutions. Future studies should evaluate how manipulating the concentration of caffeine solutions, habitual caffeine intake, and genetic modifiers of bitter taste influence the efficacy of caffeine mouth rinsing as an ergogenic strategy.
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Pereira PEA, Azevedo P, Azevedo K, Azevedo W, Machado M. Caffeine Supplementation or Carbohydrate Mouth Rinse Improves Performance. Int J Sports Med 2020; 42:147-152. [PMID: 32851636 DOI: 10.1055/a-1212-0742] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Training volume is one of the critical variables required to promote resistance training benefits (e. g., hypertrophy, muscular strength). Thus, strategies to improve training volume are required. We tested the hypothesis that there is an increase in performance and reduction in the rate of perceived exertion in strength training with caffeine supplementation, carbohydrate mouth rinse, and a synergistic effect of caffeine supplementation plus carbohydrate mouth rinse. We recruited 29 physically active women: 24±4 years, 60.0±7.9 kg, 161.0±6.0 cm. This study was a double-blind, randomized, placebo-controlled, and crossover one. The subjects performed all sessions of strength training under different conditions: caffeine (6.5 mg·kg-1 body mass); carbohydrate (6 g of maltodextrin rinsed for 10 s); caffeine plus carbohydrate; or placebo. We applied the ANOVA for repeated measures through the null-hypothesis statistical test, and the Bayes factors analyses approach. The subjects showed significant improvement in the total repetitions (P<0.01; BF10 ~99%) for both lower and upper limb exercises in all conditions compared to placebo without difference among interventions. The rate of perceived exertion (P>0.05) did not differ among interventions. However, BF10 analyses showed a higher probability of lower RPE for CAF intervention. We conclude that either caffeine supplementation or carbohydrate mouth rinse can improve performance in resistance training. There is no additional effect of caffeine plus carbohydrate.
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Affiliation(s)
- Paulo Eduardo Assis Pereira
- Human Movement Sciences and Rehabilitation, Federal University of São Paulo, Sao Paulo, Brazil.,Faculty of Nutrition, Metropolitan University of Santos, Santos, Brazil.,Faculty of Physical Education, Praia Grande College, Praia Grande, Brazil
| | - Paulo Azevedo
- Human Movement Sciences and Rehabilitation, Federal University of São Paulo, Sao Paulo, Brazil
| | - Katia Azevedo
- Physical Education, Universitary Foundation of Itaperuna, Itaperuna, Brazil
| | - Warleyson Azevedo
- Physical Education, Universitary Foundation of Itaperuna, Itaperuna, Brazil
| | - Marco Machado
- Laboratory of Physiology and Biokinetic, UNIG Campus V at Itaperuna, Itaperuna, Brazil
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25
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Brietzke C, Franco-Alvarenga PE, Canestri R, Goethel MF, Vínicius Í, Painelli VDS, Santos TM, Hettinga FJ, Pires FO. Carbohydrate Mouth Rinse Mitigates Mental Fatigue Effects on Maximal Incremental Test Performance, but Not in Cortical Alterations. Brain Sci 2020; 10:brainsci10080493. [PMID: 32751162 PMCID: PMC7465505 DOI: 10.3390/brainsci10080493] [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: 06/30/2020] [Revised: 07/21/2020] [Accepted: 07/24/2020] [Indexed: 12/31/2022] Open
Abstract
Detrimental mental fatigue effects on exercise performance have been documented in constant workload and time trial exercises, but effects on a maximal incremental test (MIT) remain poorly investigated. Mental fatigue-reduced exercise performance is related to an increased effort sensation, likely due to a reduced prefrontal cortex (PFC) activation and inhibited spontaneous behavior. Interestingly, only a few studies verified if centrally active compounds may mitigate such effects. For example, carbohydrate (CHO) mouth rinse potentiates exercise performance and reduces effort sensation, likely through its effects on PFC activation. However, it is unknown if this centrally mediated effect of CHO mouth rinse may mitigate mental fatigue-reduced exercise performance. After a proof-of-principle study, showing a mental fatigue-reduced MIT performance, we observed that CHO mouth rinse mitigated MIT performance reductions in mentally fatigued cyclists, regardless of PFC alterations. When compared to placebo, mentally fatigued cyclists improved MIT performance by 2.24–2.33% when rinsing their mouth with CHO during MIT. However, PFC and motor cortex activation during MIT in both CHO and placebo mouth rinses were greater than in mental fatigue. Results showed that CHO mouth rinse mitigated the mental fatigue-reduced MIT performance, but challenged the role of CHO mouth rinse on PFC and motor cortex activation.
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Affiliation(s)
- Cayque Brietzke
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo 05508-060, Brazil; (C.B.); (P.E.F.-A.); (R.C.); (M.F.G.); (Í.V.); (V.d.S.P.)
- Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Avenida Sena Madureira 1500, Brazil
| | - Paulo Estevão Franco-Alvarenga
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo 05508-060, Brazil; (C.B.); (P.E.F.-A.); (R.C.); (M.F.G.); (Í.V.); (V.d.S.P.)
- Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Avenida Sena Madureira 1500, Brazil
| | - Raul Canestri
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo 05508-060, Brazil; (C.B.); (P.E.F.-A.); (R.C.); (M.F.G.); (Í.V.); (V.d.S.P.)
| | - Márcio Fagundes Goethel
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo 05508-060, Brazil; (C.B.); (P.E.F.-A.); (R.C.); (M.F.G.); (Í.V.); (V.d.S.P.)
- Porto Biomechanics Laboratory (LABIOMEP), University of Porto, 4000 Porto, Portugal
| | - Ítalo Vínicius
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo 05508-060, Brazil; (C.B.); (P.E.F.-A.); (R.C.); (M.F.G.); (Í.V.); (V.d.S.P.)
| | - Vitor de Salles Painelli
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo 05508-060, Brazil; (C.B.); (P.E.F.-A.); (R.C.); (M.F.G.); (Í.V.); (V.d.S.P.)
- Strength Training Study and Research Group, Institute of Health Sciences, Paulista University, Sao Paulo 05347-020, Brazil
| | - Tony Meireles Santos
- Physical Education Program, Research Center for Performance and Health, Federal University of Pernambuco, Recife 52071-030, Brazil;
| | | | - Flávio Oliveira Pires
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo 05508-060, Brazil; (C.B.); (P.E.F.-A.); (R.C.); (M.F.G.); (Í.V.); (V.d.S.P.)
- Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Avenida Sena Madureira 1500, Brazil
- Correspondence: ; Tel.: +55-11-26480118
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Durkin M, Akeroyd H, Holliday A. Carbohydrate mouth rinse improves resistance exercise capacity in the glycogen-lowered state. Appl Physiol Nutr Metab 2020; 46:126-132. [PMID: 32726566 DOI: 10.1139/apnm-2020-0298] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The effect of carbohydrate mouth rinse (CHO MR) on resistance exercise performance is equivocal and may be moderated by carbohydrate availability. This study determined the effect of CHO MR on low-load resistance exercise capacity completed in a fed but glycogen-lowered state. Twelve resistance-trained men (age: 22 ± 4 years; height: 1.79 ± 0.05 m; mass: 78.7 ± 7.8 kg; bench press one-repetition maximum (1RM): 87 ± 21 kg; squat 1RM: 123 ± 19 kg) completed two fed-state resistance exercise bouts consisting of six sets of bench press and six sets of squat to failure at 40% 1RM. Each bout was preceded by glycogen-depleting cycling the evening before, with feeding controlled to create acute energy deficit and maintain low muscle glycogen. During resistance exercise, participants rinsed with either a 6% CHO MR solution or a taste-matched placebo (PLA) between sets. Total volume workload was greater with CHO MR (9354 ± 2051 vs. 8525 ± 1911 kg, p = 0.010). Total number of repetitions of squat were greater with CHO MR (107 ± 26 vs. 92 ± 16, p = 0.017); the number of repetitions of bench press were not significantly different (CHO MR: 120 ± 24 vs. PLA: 115 ± 22, p = 0.146). This was independent of differences in feeling or arousal. CHO MR may be an effective ergogenic aid for athletes completing resistance exercise when in energy deficit and with low carbohydrate availability. Novelty: CHO MR can increase low-load resistance exercise capacity undertaken in a glycogen-lowered but fed state. This effect was driven by a greater number of repetitions-to-failure in the squat - using muscles lowered in glycogen content with exhaustive cycling on the evening prior to resistance exercise - but not bench press.
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Affiliation(s)
- Matthew Durkin
- Institute of Sport, Physical Activity and Leisure, Leeds Beckett University, Headingley Campus, Leeds LS6 3QS, United Kingdom.,Institute of Sport, Physical Activity and Leisure, Leeds Beckett University, Headingley Campus, Leeds LS6 3QS, United Kingdom
| | - Harriet Akeroyd
- Institute of Sport, Physical Activity and Leisure, Leeds Beckett University, Headingley Campus, Leeds LS6 3QS, United Kingdom.,Institute of Sport, Physical Activity and Leisure, Leeds Beckett University, Headingley Campus, Leeds LS6 3QS, United Kingdom
| | - Adrian Holliday
- Institute of Sport, Physical Activity and Leisure, Leeds Beckett University, Headingley Campus, Leeds LS6 3QS, United Kingdom.,Institute of Sport, Physical Activity and Leisure, Leeds Beckett University, Headingley Campus, Leeds LS6 3QS, United Kingdom
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Suzuki Y, Sato K, Sakuraba K, Akaishi T, Sugiyama K, Suzuki H, Ymawaki K. Pre-exercise Trehalose Ingestion Enhanced Exercise Performance in Male Collegiate Distance Runners. Nat Prod Commun 2020. [DOI: 10.1177/1934578x20933727] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A total of 10 male collegiate distance runners participated in a randomized crossover trial. After completing a warm-up, each participant ingested 300 mL of a test drink and performed 2 sets of pedaling for the duration of 10 minutes (tests 1 and 3) and a 30-second sprint test (tests 2 and 4) with 3-minute interval. During the exercise tests, participants were instructed to make a full power output in 30-second sprint tests and to keep the effort equivalent to their own pace in 10 000 m track race without a final push in the 10-minute pedaling phase. The test drinks allocated to the participants were either trehalose (6% w/v), glucose (6% w/v), or water. During the 4 tests, trehalose presented with the highest mean power outputs compared to that of glucose and water. It was statistically significant against water and glucose especially in the first 10 minutes of pedaling (test 1) and the last 30 seconds of sprint tests (test 4). Therefore, data indicate that trehalose may enhance exercise performance.
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Affiliation(s)
- Yoshio Suzuki
- Graduate School of Health and Sports Science, Juntendo University, Inzai, Chiba, Japan
- Faculty of Health and Sports Science, Juntendo University, Inzai, Chiba, Japan
| | - Kotaro Sato
- Faculty of Health and Sports Science, Juntendo University, Inzai, Chiba, Japan
| | - Keishoku Sakuraba
- Graduate School of Health and Sports Science, Juntendo University, Inzai, Chiba, Japan
- Faculty of Health and Sports Science, Juntendo University, Inzai, Chiba, Japan
| | - Tatsuyuki Akaishi
- Faculty of Health and Sports Science, Juntendo University, Inzai, Chiba, Japan
| | - Kana Sugiyama
- Faculty of Health and Sports Science, Juntendo University, Inzai, Chiba, Japan
| | - Hiroyuki Suzuki
- Faculty of Health and Sports Science, Juntendo University, Inzai, Chiba, Japan
| | - Koudai Ymawaki
- Faculty of Health and Sports Science, Juntendo University, Inzai, Chiba, Japan
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Abstract
Taste is a homeostatic function that conveys valuable information, such as energy density, readiness to eat, or toxicity of foodstuffs. Taste is not limited to the oral cavity but affects multiple physiological systems. In this review, we outline the ergogenic potential of substances that impart bitter, sweet, hot and cold tastes administered prior to and during exercise performance and whether the ergogenic benefits of taste are attributable to the placebo effect. Carbohydrate mouth rinsing seemingly improves endurance performance, along with a potentially ergogenic effect of oral exposure to both bitter tastants and caffeine although subsequent ingestion of bitter mouth rinses is likely required to enhance performance. Hot and cold tastes may prove beneficial in circumstances where athletes' thermal state may be challenged. Efficacy is not limited to taste, but extends to the stimulation of targeted receptors in the oral cavity and throughout the digestive tract, relaying signals pertaining to energy availability and temperature to appropriate neural centres. Dose, frequency and timing of tastant application likely require personalisation to be most effective, and can be enhanced or confounded by factors that relate to the placebo effect, highlighting taste as a critical factor in designing and administering applied sports science interventions.
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Chandler MC, McGowan AL, Ferguson DP, Pontifex MB. Carbohydrate mouth rinse has no effects on behavioral or neuroelectric indices of cognition. Int J Psychophysiol 2020; 151:49-58. [PMID: 32087182 DOI: 10.1016/j.ijpsycho.2020.02.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2019] [Revised: 01/29/2020] [Accepted: 02/17/2020] [Indexed: 01/21/2023]
Abstract
Rinsing the mouth with a carbohydrate solution has been suggested as a means to enhance aspects of both physical and cognitive performance. However, evidence in support of these assertions is relatively weak. The purpose of this study was to investigate the effects of a carbohydrate mouth rinse solution on motor speed, inhibition, and sustained attention as indexed by both behavioral and neuroelectric measures. Using a double-blind, placebo-controlled, within-subjects crossover design, 50 college-aged young adults performed a battery of cognitive tasks both before and after rinsing their mouth for 10 s with 20 mL of either a carbohydrate mouth rinse solution or a sensory-matched placebo control solution. A simple tapping task was used as a measure of motor speed, a modified Eriksen flanker task was used to index inhibition, and a rapid visual information processing task was used as a measure of sustained attention. Participants demonstrated longer reaction times in the Flanker task after rinsing their mouths with the carbohydrate mouth rinse, relative to pretest. No differences in reaction time were observed for the placebo control condition. P3 latency in the Flanker task as an index of attentional processing speed was shorter at posttest than at pretest in the placebo control - but not the carbohydrate mouth rinse - condition. These results suggest that despite claims of cognitive enhancement, carbohydrate mouth rinses do not appear to alter motor speed, inhibition, or sustained attention as compared to a placebo control in non-physically-fatigued college-aged adults.
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Affiliation(s)
- Madison C Chandler
- Department of Kinesiology, Michigan State University, 308 W. Circle Drive, East Lansing, MI 48824, United States of America.
| | - Amanda L McGowan
- Department of Kinesiology, Michigan State University, 308 W. Circle Drive, East Lansing, MI 48824, United States of America.
| | - David P Ferguson
- Department of Kinesiology, Michigan State University, 308 W. Circle Drive, East Lansing, MI 48824, United States of America.
| | - Matthew B Pontifex
- Department of Kinesiology, Michigan State University, 308 W. Circle Drive, East Lansing, MI 48824, United States of America.
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Reply to Borszcz & de Lucas: Comment on: "Effects of Carbohydrate Mouth Rinse on Cycling Time Trial Performance: A Systematic Review and Meta-Analysis". Sports Med 2019; 50:633-637. [PMID: 31696451 DOI: 10.1007/s40279-019-01212-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Baltazar-Martins G, Del Coso J. Carbohydrate Mouth Rinse Decreases Time to Complete a Simulated Cycling Time Trial. Front Nutr 2019; 6:65. [PMID: 31157228 PMCID: PMC6530344 DOI: 10.3389/fnut.2019.00065] [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: 12/30/2018] [Accepted: 04/23/2019] [Indexed: 01/28/2023] Open
Abstract
Rinsing carbohydrate solutions in the mouth can produce positive effects on the central nervous system via mouth/tongue receptors, ultimately increasing cycling performance. However, previous investigations on this topic have used complex carbohydrate solutions and time trials on a cyclergometer to complete a set amount of work. The purpose of the present study was to examine the effects of carbohydrate mouth rinsing on physical performance by using a commercially available drink during a cycling time trial with varying slopes. In a double-blind, placebo-controlled and randomized manner, 16 well-trained cyclists (37.6 ± 3.5 years; 76.9 ± 7.9 kg) performed two simulated cycling time trial (25.3 km) with their own bikes on a 3D virtual trainer. In one occasion, participants mouth-rinsed a 6.4% carbohydrate mixed solution for 5 s each 12.5% of total completion of the trial; in other occasion participants rinsed with a taste-matched placebo with 0.0% of carbohydrate. During the trials, participants were instructed to perform as fast as possible at a self-chosen pace while time, cycling power output and ratings of perceived exertion were obtained during the trials. When compared to the placebo, carbohydrate mouth rinse decreased the time employed to complete the distance (2,960 ± 412 vs. 2,888 ± 396 s; P = 0.04, respectively), while it increased overall cycling power (222 ± 51 vs. 231 ± 46 w, P = 0.04) and cycling power during the climbing sections (238 ± 46 vs. 248 ± 47 w, P = 0.03). Carbohydrate mouth rinse also increased the rating of perceived exertion at the end of the trial (18.3 ± 1.7 vs. 18.9 ± 1.1 arbitrary units, P = 0.04). In summary, mouth rinsing with a commercially available carbohydrate drink might be considered as an effective strategy to increase physical performance during cycling time trials. However, due to the performance downsides of breaking the aero-position or interrupting the breathing pattern for rising during a time trial, carbohydrate mouth rinse protocols might be more suitable for high-intensity training sessions, particularly those sessions intentionally performed with low carbohydrate intake.
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Affiliation(s)
- Gabriel Baltazar-Martins
- Faculty of Sports Science, European University of Madrid, Madrid, Spain
- Exercise Physiology Laboratory, Sport Science Institute, Camilo José Cela University, Madrid, Spain
| | - Juan Del Coso
- Exercise Physiology Laboratory, Sport Science Institute, Camilo José Cela University, Madrid, Spain
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Brietzke C, Franco-Alvarenga PE, Pires FO. Reply to Li et al.: Comment on "Effects of Carbohydrate Mouth Rinse on Cycling Time Trial Performance: A Systematic Review and Meta-Analysis". Sports Med 2019; 49:823-825. [PMID: 30805911 DOI: 10.1007/s40279-019-01077-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Cayque Brietzke
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, 1000 Arlindo Béttio Av, Ermelino Matarazzo, São Paulo, SP, 03828-000, Brazil
| | - Paulo Estevão Franco-Alvarenga
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, 1000 Arlindo Béttio Av, Ermelino Matarazzo, São Paulo, SP, 03828-000, Brazil
| | - Flávio Oliveira Pires
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, 1000 Arlindo Béttio Av, Ermelino Matarazzo, São Paulo, SP, 03828-000, Brazil.
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Li S, Wu Y, Cao Y. Comment on: "Effects of Carbohydrate Mouth Rinse on Cycling Time Trial Performance: A Systematic Review and Meta-Analysis". Sports Med 2019; 49:819-821. [PMID: 30805912 DOI: 10.1007/s40279-019-01076-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Shuangjun Li
- Department of Oral and Maxillofacial Surgery, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, People's Republic of China
| | - Yingyi Wu
- West China College of Stomatology and State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, People's Republic of China
| | - Yubin Cao
- Department of Head and Neck Oncology, West China Hospital of Stomatology and State Key Laboratory of Oral Diseases, Sichuan University, No. 14, Section Three, Ren Min Nan Road, Chengdu, 610041, People's Republic of China.
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