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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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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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Pellicer-Caller R, Vaquero-Cristóbal R, González-Gálvez N, Abenza-Cano L, Horcajo J, de la Vega-Marcos R. Influence of Exogenous Factors Related to Nutritional and Hydration Strategies and Environmental Conditions on Fatigue in Endurance Sports: A Systematic Review with Meta-Analysis. Nutrients 2023; 15:2700. [PMID: 37375605 DOI: 10.3390/nu15122700] [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: 05/09/2023] [Revised: 05/31/2023] [Accepted: 06/06/2023] [Indexed: 06/29/2023] Open
Abstract
The aim of this systematic review with meta-analysis was to examine the influence of exogenous factors related to nutritional and hydration strategies and environmental conditions, as modulators of fatigue, including factors associated with performance fatigability and perceived fatigability, in endurance tests lasting 45 min to 3 h. A search was carried out using four databases: PubMed, Web of Science, SPORTDiscus, and EBSCO. A total of 5103 articles were screened, with 34 included in the meta-analysis. The review was registered with PROSPERO (CRD42022327203) and adhered to the PRISMA guidelines. The study quality was evaluated according to the PEDro score and assessed using Rosenthal's fail-safe N. Carbohydrate (CHO) intake increased the time to exhaustion (p < 0.001) and decreased the heart rate (HR) during the test (p = 0.018). Carbohydrate with protein intake (CHO + PROT) increased lactate during the test (p = 0.039). With respect to hydration, dehydrated individuals showed a higher rate of perceived exertion (RPE) (p = 0.016) and had a higher body mass loss (p = 0.018). In hot conditions, athletes showed significant increases in RPE (p < 0.001), HR (p < 0.001), and skin temperature (p = 0.002), and a decrease in the temperature gradient (p < 0.001) after the test. No differences were found when athletes were subjected to altitude or cold conditions. In conclusion, the results revealed that exogenous factors, such as nutritional and hydration strategies, as well as environmental conditions, affected fatigue in endurance sports, including factors associated with performance fatigability and perceived fatigability.
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Affiliation(s)
- Roberto Pellicer-Caller
- Facultad de Deporte, UCAM Universidad Católica de Murcia, 30107 Murcia, Spain
- Caller Energy Labs, Caller SportEnergy S.L., 39005 Santander, Spain
| | | | | | - Lucía Abenza-Cano
- Facultad de Deporte, UCAM Universidad Católica de Murcia, 30107 Murcia, Spain
| | - Javier Horcajo
- Department of Social Psychology and Methodology, Autonomous University of Madrid, 28049 Madrid, Spain
| | - Ricardo de la Vega-Marcos
- Department of Physical Education, Sport and Human Movement, Autonomous University of Madrid, 28049 Madrid, Spain
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Carbohydrate mouth rinse is no more effective than placebo on running endurance of dehydrated and heat acclimated athletes. Eur J Appl Physiol 2023:10.1007/s00421-023-05170-y. [PMID: 36920510 DOI: 10.1007/s00421-023-05170-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Accepted: 02/27/2023] [Indexed: 03/16/2023]
Abstract
PURPOSE To determine whether carbohydrate mouth rinsing would improve endurance running performance of tropical natives in a warm-humid (30 °C and 70% relative humidity) environment. METHOD Twelve endurance male runners [age 25 ± 3 years; peak aerobic capacity ([Formula: see text]O2peak) 57.6 ± 3.6 mL.kg-1.min-1] completed three time-to-exhaustion (TTE) trials at ~ 70% [Formula: see text]O2peak while swilling 25 ml of a 6% carbohydrate (CHO) or taste-matched placebo (PLA) as well as no mouth rinse performed in the control (CON) trial. RESULTS TTE performance was significantly longer in both CHO and PLA trials when compared with the CON trial (54.7 ± 5.4 and 53.6 ± 5.1 vs. 48.4 ± 3.6 min, respectively; p < 0.001 and p = 0.012, respectively), but was not significantly different between CHO and PLA trials (p = 1.000). The rating of perceived exertion was not different between the CHO and PLA trials, however, was significantly affected when compared to the CON trial (p < 0.001). A similar effect was observed for perceived arousal level between the CHO and PLA trials to the CON trial. Core temperature, mean skin temperature and skin blood flow were not significantly different between the three trials (all p > 0.05). Similarly, plasma lactate and glucose as well as exercise heart rate were not influenced by the trials. CONCLUSIONS The present study demonstrates that mouth rinsing, whether carbohydrate or placebo, provides an ergogenic benefit to running endurance when compared to CON in a heat stress environment. Nevertheless, the results do not support the notion that rinsing a carbohydrate solution provides a greater advantage as previously described among non-heat acclimated individuals within a temperate condition.
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Passafiume JA, Glover NA, Crecelius AR, Chaudhari AMW. The influence of receiving real-time visual feedback on breathing during treadmill running to exhaustion. PLoS One 2022; 17:e0270335. [PMID: 35797373 PMCID: PMC9262203 DOI: 10.1371/journal.pone.0270335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Accepted: 06/08/2022] [Indexed: 11/24/2022] Open
Abstract
Breathing plays a vital role in everyday life, and specifically during exercise it provides working muscles with the oxygen necessary for optimal performance. Respiratory inductance plethysmography (RIP) monitors breathing through elastic belts around the chest and abdomen, with efficient breathing defined by synchronous chest and abdomen movement. This study examined if providing runners with visual feedback through RIP could increase breathing efficiency and thereby time to exhaustion. Thirteen recreational runners (8F, 5M) ran to exhaustion on an inclined treadmill on two days, with visual feedback provided on one randomly chosen day. Phase angle was calculated as a measure of thoraco-abdominal coordination. Time to exhaustion was not significantly increased when visual feedback was provided (p = 1). Phase angle was not significantly predicted by visual feedback (p = 0.667). Six participants improved phase angle when visual feedback was provided, four of whom increased time to exhaustion. Four participants improved phase angle by 9° or more, three of whom increased time to exhaustion. Participants who improved phase angle with visual feedback highlight that improving phase angle could increase time to exhaustion. Greater familiarization with breathing techniques and visual feedback and a different paradigm to induce running fatigue are needed to support future studies of breathing in runners.
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Affiliation(s)
- Joseph A. Passafiume
- Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio, United States of America
- * E-mail:
| | - Nelson A. Glover
- Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio, United States of America
| | - Anne R. Crecelius
- Department of Health and Sport Science, University of Dayton, Dayton, Ohio, United States of America
| | - Ajit M. W. Chaudhari
- Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio, United States of America
- School of Health and Rehabilitation Sciences, The Ohio State University, Columbus, Ohio, United States of America
- Sports Medicine Research Institute, The Ohio State University, Columbus, Ohio, United States of America
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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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7
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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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Chiu CH, Chen CH, Yang TJ, Chou KM, Chen BW, Lin ZY, Lin YC. Carbohydrate mouth rinsing decreases fatigue index of taekwondo frequency speed of kick test. CHINESE J PHYSIOL 2022; 65:46-50. [DOI: 10.4103/cjp.cjp_99_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Black CD, Haskins KR, Bemben MG, Larson RD. Carbohydrate Mouth Rinsing Does Not Alter Central or Peripheral Fatigue After High-Intensity and Low-Intensity Exercise in Men. J Strength Cond Res 2022; 36:142-148. [PMID: 34941611 DOI: 10.1519/jsc.0000000000004162] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
ABSTRACT Black, CD, Haskins, KR, Bemben, MG, and Larson, RD. Carbohydrate mouth rinsing does not alter central or peripheral fatigue after high-intensity and low-intensity exercise in men. J Strength Cond Res 36(1): 142-148, 2022-Carbohydrate (CHO) mouth rinsing improves performance during endurance exercise. However, its ability to attenuate fatigue during strength-based exercise is less certain. This study sought to determine the effects of a CHO mouth rinse on torque production and voluntary activation (VA%) after high-intensity and low-intensity isometric exercise. Twelve male subjects (22.5 ± 2.3 years; 183.5 ± 6.5 cm; 82.2 ± 13.9 kg) completed 4 testing sessions in a double-blind crossover fashion. Knee extension maximal voluntary isometric strength (MVC) was assessed before(Pre), immediately (iPost-Ex), and 5 minutes (5-min Post Ex) after isometric exercise performed at 80% or 20% of MVC. An 8% CHO solution or placebo (PLA) was rinsed for 20 seconds after exercise. VA% was determined by twitch interpolation. A 2 condition (CHO vs. PLA) × 2 contraction intensity (20 vs. 80%) × 3 time (Pre, iPost Ex, and 5-min Post Ex) completely within subject-repeated measured analysis of variance was performed; statistical significance was set at p ≤ 0.05. Greater reductions in MVC were found at iPost-Ex after exercise at 20% compared with 80% of MVC (-25 ± 14% vs. -11 ± 8%; p < 0.001) as well as for VA% (-17 ± 14% vs. -8 ± 14%; p < 0.004). No differences were observed in the CHO vs. PLA condition (p ≥ 0.34). We were successful in eliciting differing levels of central and peripheral fatigue by exercising at a low and high intensity. Despite significantly larger declines in VA% after exercise at 20% of MVC, CHO mouth rinsing had no effects compared with placebo on any measured variable.
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Affiliation(s)
- Christopher D Black
- Department of Health and Exercise Science, University of Oklahoma, Norman, Oklahoma
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10
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Evans ES, Brophy T, Braswell MR, Boyle J, Harris GK, Watkins RH, Bailey SP. Carbohydrate mouth rinsing does not affect 6-min walk test performance and blood glucose responses in older adults. Eur J Appl Physiol 2021; 121:2849-2858. [PMID: 34173862 DOI: 10.1007/s00421-021-04753-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 06/15/2021] [Indexed: 10/21/2022]
Abstract
PURPOSE Carbohydrate (CHO) mouth rinsing (MR) prior to exercise has been shown to elicit enhanced performance and energy availability in some studies. Previous literature has concentrated on examining CHO MR strategies for improving aerobic endurance performance in younger athletic adults. Knowledge of the impact of CHO MR on functional performance in older adults is scarce. The purpose of this investigation was to determine if CHO MR would improve 6-min walk test (6MWT) performance, perceived exertion, and blood glucose responses in older adults. METHOD Thirty-three individuals (16 males, 17 females), age ≥ 70 years performed two 6MWT trials, one of which utilized a 6.4% maltodextrin CHO MR and one of which utilized a placebo MR. Participants held the MR in their mouth for 20 s prior to the 6MWT, and trials occurred in a counterbalanced fashion. Total distance walked and rating of perceived exertion (RPE) were recorded upon completion of each 6MWT. Heart rate (HR), peripheral blood oxygen saturation (SpO2), systolic and diastolic blood pressures (BP), blood glucose, and blood lactate were measured before and after each 6MWT. RESULT CHO MR did not alter the response of any study parameter compared to the placebo MR (p = 0.13-0.94). HR, systolic BP, and blood lactate increased and SpO2 decreased across time (p < 0.01). CONCLUSION A 6.4% maltodextrin CHO MR did not alter total distance walked, perceived exertion, or other physiological responses elicited by the 6MWT in older adults.
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Affiliation(s)
- Elizabeth S Evans
- Department of Physical Therapy Education, Elon University, 2085 Campus Box, Elon, NC, 27244, USA.
| | - Terrence Brophy
- Department of Physical Therapy Education, Elon University, 2085 Campus Box, Elon, NC, 27244, USA
| | - Matthew R Braswell
- Department of Physical Therapy Education, Elon University, 2085 Campus Box, Elon, NC, 27244, USA
| | - Joshua Boyle
- Department of Physical Therapy Education, Elon University, 2085 Campus Box, Elon, NC, 27244, USA
| | - G Keith Harris
- Department of Food, Bioprocessing, and Nutrition Sciences, North Carolina State University, Raleigh, NC, USA
| | - Ruth H Watkins
- Department of Food, Bioprocessing, and Nutrition Sciences, North Carolina State University, Raleigh, NC, USA
| | - Stephen P Bailey
- Department of Physical Therapy Education, Elon University, 2085 Campus Box, Elon, NC, 27244, USA
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Pomportes L, Brisswalter J. Carbohydrate mouth rinse effects on physical and cognitive performance: Benefits and limitations in sports. Sci Sports 2020. [DOI: 10.1016/j.scispo.2020.06.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Berry MJ, Miller GD, Kim-Shapiro DB, Fletcher MS, Jones CG, Gauthier ZD, Collins SL, Basu S, Heinrich TM. A randomized controlled trial of nitrate supplementation in well-trained middle and older-aged adults. PLoS One 2020; 15:e0235047. [PMID: 32574223 PMCID: PMC7310701 DOI: 10.1371/journal.pone.0235047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 06/05/2020] [Indexed: 12/22/2022] Open
Abstract
Purpose Nitrate (NO3-), through its conversion to nitrite (NO2-) and nitric oxide, has been shown to increase exercise tolerance in healthy younger adults and older diseased patients. Nitrate’s effect in well-trained middle to older-aged adults has not been studied. Therefore, the purpose of this investigation was to examine the effects of a NO3- rich beverage on submaximal constant work rate exercise time in well-trained middle to older-aged adults. Methods This was a randomized controlled cross-over trial with 15 well-trained middle to older-aged adults, 41–64 year-old, who received one of two treatments (NO3- rich beverage then placebo or placebo then NO3- rich beverage), after which an exercise test at 75 percent of the subject’s maximal work rate was completed. Results The NO3- rich beverage increased plasma NO3- and NO2- levels by 260 μM and 0.47 μM, respectively (p<0.001). Exercise time was not significantly different (p = 0.31) between the NO3- rich versus placebo conditions (1130±151 vs 1060±132 sec, respectively). Changes in exercise time between the two conditions ranged from a 55% improvement to a 40% decrease with the NO3- rich beverage. Oxygen consumption and rating of perceived exertion were not significantly different between the two conditions. Conclusion In middle to older-aged well-trained adults, NO3- supplementation has non-significant, albeit highly variable, effects on exercise tolerance. ClinicalTrials.gov Identifier: NCT03371966
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Affiliation(s)
- Michael J. Berry
- Health and Exercise Department, Wake Forest University, Winston-Salem, North Carolina, United States of America
- * E-mail:
| | - Gary D. Miller
- Health and Exercise Department, Wake Forest University, Winston-Salem, North Carolina, United States of America
| | - Daniel B. Kim-Shapiro
- Physics Department, Wake Forest University, Winston-Salem, North Carolina, United States of America
| | - Macie S. Fletcher
- Health and Exercise Department, Wake Forest University, Winston-Salem, North Carolina, United States of America
| | - Caleb G. Jones
- Health and Exercise Department, Wake Forest University, Winston-Salem, North Carolina, United States of America
| | - Zachary D. Gauthier
- Health and Exercise Department, Wake Forest University, Winston-Salem, North Carolina, United States of America
| | - Summer L. Collins
- Health and Exercise Department, Wake Forest University, Winston-Salem, North Carolina, United States of America
| | - Swati Basu
- Physics Department, Wake Forest University, Winston-Salem, North Carolina, United States of America
| | - Timothy M. Heinrich
- Health and Exercise Department, Wake Forest University, Winston-Salem, North Carolina, United States of America
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Effect of carbohydrate mouth rinse on resistance training performance in trained men. TURKISH JOURNAL OF KINESIOLOGY 2020. [DOI: 10.31459/turkjkin.718107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Brietzke C, Franco-Alvarenga PE, Coelho-Júnior HJ, Silveira R, Asano RY, Pires FO. Effects of Carbohydrate Mouth Rinse on Cycling Time Trial Performance: A Systematic Review and Meta-Analysis. Sports Med 2020; 49:57-66. [PMID: 30488186 DOI: 10.1007/s40279-018-1029-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Despite the growing number of studies reporting carbohydrate mouth rinse effects on endurance performance, no systematic and meta-analysis review has been conducted to elucidate the level of evidence of carbohydrate mouth rinse effects on cycling trial performance such as time-, work-, and distance-based trials. OBJECTIVES The objective of this study were to establish the effect of a carbohydrate mouth rinse on cycling performance outcomes such as mean power output and time to complete a trial, together with the risk of bias in the cycling-carbohydrate mouth rinse literature. METHODS We systematically reviewed randomized placebo-controlled trials that assessed carbohydrate mouth rinse effects on mean power output and time to complete the trial. A random-effects meta-analysis assessed the standardized mean difference between carbohydrate and placebo mouth rinses. RESULTS Thirteen studies (16 trials) were qualitatively (systematic review) and quantitatively (meta-analysis) analyzed with regard to mean power output (n = 175) and time to complete the trial (n = 151). Overall, the reviewed studies showed a low risk of bias and homogeneous results for mean power output (I2 = 0%) and time to complete the trial (I2 = 0%). When compared with placebo, the carbohydrate mouth rinse improved mean power output (standardized mean difference = 0.25; 95% confidence interval 0.04-0.46; p = 0.02), but not the time to complete the trial (standardized mean difference = - 0.13; 95% confidence interval - 0.36 to 0.10; p = 0.25). CONCLUSION The present systematic and meta-analytic review supports the notion that a carbohydrate mouth rinse has the potential to increase mean power output in cycling trials, despite showing no superiority over placebo in improving time to complete the trials.
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Affiliation(s)
- Cayque Brietzke
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, 1000 Arlindo Béttio Avenue, 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 Avenue, Ermelino Matarazzo, São Paulo, SP, 03828-000, Brazil
| | - Hélio José Coelho-Júnior
- Applied Kinesiology Laboratory, University of Campinas, 701 Érico Veríssimo Avenue, Barão Geraldo, Campinas, SP, 13.083-851, Brazil
| | - Rodrigo Silveira
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, 1000 Arlindo Béttio Avenue, Ermelino Matarazzo, São Paulo, SP, 03828-000, Brazil
| | - Ricardo Yukio Asano
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, 1000 Arlindo Béttio Avenue, 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 Avenue, Ermelino Matarazzo, São Paulo, SP, 03828-000, Brazil.
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15
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The ergogenic potency of carbohydrate mouth rinse on endurance running performance of dehydrated athletes. Eur J Appl Physiol 2019; 119:1711-1723. [PMID: 31098832 DOI: 10.1007/s00421-019-04161-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 05/09/2019] [Indexed: 10/26/2022]
Abstract
PURPOSE To examine the effect of carbohydrate (CHO) mouth rinsing on endurance running responses and performance in dehydrated individuals. METHODS In a double blind, randomised crossover design, 12 well-trained male runners completed 4 running time to exhaustion (TTE) trials at a speed equivalent to 70% of VO2peak in a thermoneutral condition. Throughout each run, participants mouth rinsed and expectorated every 15 min either 25 mL of 6% CHO or a placebo (PLA) solution for 10 s. The four TTEs consisted of two trials in the euhydrated (EU-CHO and EU-PLA) and two trials in the dehydrated (DY-CHO and DY-PLA) state. Prior to each TTE run, participants were dehydrated via exercise and allowed a passive rest period during which they were fed and either rehydrated equivalent to their body mass deficit (i.e., EU trials) or ingested only 50 mL of water (DY trials). RESULTS CHO mouth rinsing significantly improved TTE performance in the DY compared to the EU trials (78.2 ± 4.3 vs. 76.9 ± 3.8 min, P = 0.02). The arousal level of the runners was significantly higher in the DY compared to the EU trials (P = 0.02). There was no significant difference among trials in heart rate, plasma glucose and lactate, and psychological measures. CONCLUSIONS CHO mouth rinsing enhanced running performance significantly more when participants were dehydrated vs. euhydrated due to the greater sensitivity of oral receptors related to thirst and central mediated activation. These results show that level of dehydration alters the effect of brain perception with presence of CHO.
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16
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Pires FO, Brietzke C, Pinheiro FA, Veras K, de Mattos ECT, Rodacki ALF, Ugrinowitsch C. Carbohydrate Mouth Rinse Fails to Improve Four-Kilometer Cycling Time Trial Performance. Nutrients 2018. [PMID: 29534507 PMCID: PMC5872760 DOI: 10.3390/nu10030342] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
We investigated if a carbohydrate (CHO) mouth rinse may attenuate global fatigue and improve 4-km cycling time trial (TT4km) performance. After a preliminary session, cyclists (n = 9) performed a TT4km after a CHO or placebo (PLA) mouth rinse. Mean power output, time, and ratings of perceived exertion (RPE) were recorded throughout the TT4km. Twitch interpolation responses (%VA; voluntary activation and ∆Tw; delta peak twitch torque) were compared pre and post TT4km with traditional statistics and effect size (ES) analysis. Time-to-complete the 4 km and mean power output were comparable between CHO (386.4 ± 28.0 s) and PLA (385.4 ± 22.4 s). A lower central (p = 0.054) and peripheral (p = 0.02) fatigue in CHO than in PLA were suggested by an extremely-large ES in %VA (manipulation main effect: p = 0.052, d = 1.18; manipulation-by-time interaction effect: p = 0.08, d = 1.00) and an extremely, very-large ES in ∆Tw (manipulation main effect: p = 0.07, d = 0.97; time-by-manipulation interaction effect: p = 0.09, d = 0.89). The RPE increased slower in CHO than in PLA (p = 0.051; d = 0.7). The apparent reduction in global fatigue (central and peripheral) and RPESLOPE with only one CHO mouth rinse were not translated into improved TT4km performance. Further tests may be required to verify if these likely differences in global fatigue might represent an edge in the short-lasting cycling time trial performance.
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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 03828-000, Brazil.
- Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Santos 11015-020, Brazil.
| | - Cayque Brietzke
- Exercise Psychophysiology Research Group, School of Arts, Science and Humanities, University of São Paulo, São Paulo 03828-000, Brazil.
| | - Fabiano A Pinheiro
- Exercise Psychophysiology Research Group, School of Arts, Science and Humanities, University of São Paulo, São Paulo 03828-000, Brazil.
- School of Physical Education and Sport, University of São Paulo, São Paulo 05508-030, Brazil.
| | - Katherine Veras
- Integrated Group of Biotechnology, Lab Adipose Tissue Biology, University of Mogi das Cruzes, São Paulo 05305-000, Brazil.
| | - Eugênia C T de Mattos
- Physical Education Department, Federal University of Paraná, Paraná 80060-000, Brazil.
| | - André L F Rodacki
- Physical Education Department, Federal University of Paraná, Paraná 80060-000, Brazil.
| | - Carlos Ugrinowitsch
- School of Physical Education and Sport, University of São Paulo, São Paulo 05508-030, Brazil.
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17
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Bataineh MF, Al-Nawaiseh AM, Abu Altaieb MH, Bellar DM, Hindawi OS, Judge LW. Impact of carbohydrate mouth rinsing on time to exhaustion during Ramadan: A randomized controlled trial in Jordanian men. Eur J Sport Sci 2018; 18:357-366. [PMID: 29364063 DOI: 10.1080/17461391.2017.1420236] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Mouth rinsing using a carbohydrate (CHO) solution has been suggested to improve physical performance in fasting participants. This study examined the effects of CHO mouth rinsing during Ramadan fasting on running time to exhaustion and on peak treadmill speed (Vpeak). In a counterbalanced crossover design, 18 sub-elite male runners (Age: 21 ± 2 years, Weight: 68.1 ± 5.7 kg, VO2max: 55.4 ± 4.8 ml/kg/min) who observed Ramadan completed a familiarization trial and three experimental trials. The three trials included rinsing and expectorating a 25 mL bolus of either a 7.5% sucrose solution (CHO), a flavour and taste matched placebo solution (PLA) for 10 s, or no rinse (CON). The treatments were performed prior to an incremental treadmill test to exhaustion. Three-day dietary and exercise records were obtained on two occasions and analysed. Anthropometric characteristics were obtained and recorded for all participants. A main effect for mouth rinse on peak velocity (Vpeak) (CHO: 17.6 ± 1.5 km/h; PLA: 17.1 ± 1.4 km/h; CON: 16.7 ± 1.2 km/h; P < .001, ηp2 = 0.49) and time to exhaustion (CHO: 1282.0 ± 121.3 s; PLA: 1258.1 ± 113.4 s; CON: 1228.7 ± 98.5 s; P = .002, ηp2 = 0.41) was detected, with CHO significantly higher than PLA (P < .05) and CON (P < .05). Oxygen consumption, heart rate, respiratory exchange ratio, and rating of perceived exertion were not significantly different between treatments or trials (P > .05). Energy availability from dietary analysis, body weight, and fat-free mass did not change during the last two weeks of Ramadan (P > .05). This study concludes that carbohydrate mouth rinsing improves running time to exhaustion and peak treadmill speed under Ramadan fasting conditions.
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Affiliation(s)
- Mo'ath F Bataineh
- a Department of Sport Rehabilitation , Hashemite University , Zarqa , Jordan
| | - Ali M Al-Nawaiseh
- a Department of Sport Rehabilitation , Hashemite University , Zarqa , Jordan
| | | | - David M Bellar
- c School of Kinesiology , University of Louisiana at Lafayette , Lafayette , LA , USA
| | - Omar S Hindawi
- a Department of Sport Rehabilitation , Hashemite University , Zarqa , Jordan
| | - Lawrence W Judge
- d School of Kinesiology , Ball State University , Muncie , IN , USA
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18
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Black CD, Schubert DJ, Szczyglowski MK, Wren JD. Carbohydrate Mouth Rinsing Does Not Prevent the Decline in Maximal Strength After Fatiguing Exercise. J Strength Cond Res 2018; 32:2466-2473. [PMID: 29334582 DOI: 10.1519/jsc.0000000000002444] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Black, CD, Schubert, DJ, Szczyglowski, MK, and Wren, JD. Carbohydrate mouth rinsing does not prevent the decline in maximal strength after fatiguing exercise. J Strength Cond Res 32(9): 2466-2473, 2018-Carbohydrate (CHO) rinsing has been shown to attenuate the decline of maximal voluntary contractions (MVCs) after fatiguing exercise-perhaps through a central mechanism. This study sought to determine the effect of a CHO rinse on MVC, voluntary activation, and contractile properties after fatiguing exercise. Thirteen adults participated in a double-blind, cross-over study. Maximal voluntary contraction of the dominant knee extensors was assessed, and voluntary activation (%VA) was determined using twitch interpolation. Participants then held 50% of MVC until volitional fatigue followed by a 20-second rinse with a solution of 8% maltodextrin (CHO) or placebo (PLA). Maximal voluntary contraction and %VA were reassessed immediately and 5 minutes after exercise. Maximal voluntary contraction did not differ between the CHO and PLA conditions initially (230 ± 90 vs. 232 ± 90 N·m; p = 0.69). Maximal voluntary contraction declined after exercise (p ≤ 0.01), but no differences were found between the CHO and PLA conditions (p ≥ 0.59). %VA did not differ between conditions (91.9 ± 2.9% vs. 91.5 ± 3.8%; p ≥ 0.11) nor did it change after exercise (p = 0.57). Twitch torque, rate of torque development, and rate of torque relaxation were reduced after exercise (p ≤ 0.05) but were unaffected by CHO rinsing (p > 0.05). Unlike a previous study, a CHO rinse did not preserve MVC after fatiguing exercise. This was likely due to a lack of central fatigue induced by the exercise protocol (as %VA was unaffected) as the CHO rinse is thought to work through a central mechanism.
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Affiliation(s)
- Christopher D Black
- Department of Health and Exercise Science, University of Oklahoma, Norman, Oklahoma
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19
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Bastos-Silva VJ, Araujo GGD, Franco SVDS, Melo ADA, Learsi SK, Lima-Silva AE, Bertuzzi R. Carbohydrate mouth rinse reduces rating of perceived exertion but does not affect performance and energy systems contribution during a high-intensity exercise. MOTRIZ: REVISTA DE EDUCACAO FISICA 2017. [DOI: 10.1590/s1980-6574201700030013] [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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20
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Peart DJ. Quantifying the Effect of Carbohydrate Mouth Rinsing on Exercise Performance. J Strength Cond Res 2017; 31:1737-1743. [PMID: 28538327 DOI: 10.1519/jsc.0000000000001741] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The purpose of this study was to review the existing literature investigating carbohydrate mouth rinsing as an ergogenic aid using the effect sizes (ES) and percentage change in performance of the respective studies as outcome measures. A trivial-small average overall ES was present for the 25 studies included in the review (0.18, 95% confidence interval [CI] = 0.10-0.27). Effect sizes for the subgroups were ≥25 minutes (0.25, 95% CI = 0.14-0.36), ≤180 seconds (0.06, 95% CI = -0.03 to 0.15), resistance exercise (-0.09, 95% CI = -0.20 to 0.03) but the ES is still small. A subanalysis of ∼1-h cycling time trial performance resulted in an overall ES of 0.20 (95% CI = 0.02-0.38), and ES for performance time and power output of 0.31 (95% CI = -0.02 to 0.64) and 0.19 (95% CI = -0.09 to 0.46), respectively. Although ES were small, the average percentage change in performance in ∼1-hour trials was 2.48%, which may have implications for elite performers as this is greater than the 1.30% smallest worthwhile change recommended in the past research.
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Affiliation(s)
- Daniel J Peart
- Department of Sport, Exercise and Rehabilitation, Faculty of Health and Life Sciences, Northumbria University, Newcastle upon Tyne, United Kingdom
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21
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Pomportes L, Brisswalter J, Casini L, Hays A, Davranche K. Cognitive Performance Enhancement Induced by Caffeine, Carbohydrate and Guarana Mouth Rinsing during Submaximal Exercise. Nutrients 2017; 9:nu9060589. [PMID: 28598402 PMCID: PMC5490568 DOI: 10.3390/nu9060589] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 05/31/2017] [Accepted: 06/06/2017] [Indexed: 12/18/2022] Open
Abstract
The aim of this study was to investigate the influence of serial mouth rinsing (MR) with nutritional supplements on cognitive performance (i.e., cognitive control and time perception) during a 40-min submaximal exercise. Twenty-four participants completed 4 counterbalanced experimental sessions, during which they performed MR with either placebo (PL), carbohydrate (CHO: 1.6 g/25 mL), guarana complex (GUAc: 0.4 g/25 mL) or caffeine (CAF: 67 mg/25 mL) before and twice during exercise. The present study provided some important new insights regarding the specific changes in cognitive performance induced by nutritional supplements. The main results were: (1) CHO, CAF and GUA MR likely led participants to improve temporal performance; (2) CAF MR likely improved cognitive control; and (3) CHO MR led to a likely decrease in subjective perception of effort at the end of the exercise compared to PL, GUA and CAF. Moreover, results have shown that performing 40-min submaximal exercise enhances information processing in terms of both speed and accuracy, improves temporal performance and does not alter cognitive control. The present study opens up new perspectives regarding the use of MR to optimize cognitive performance during physical exercise.
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Affiliation(s)
- Laura Pomportes
- Laboratoire Motricité Humaine Expertise Sport Santé, Université Nice Sophia Antipolis, 06205 Nice, France.
- CREPS PACA, 13080 Aix-en-Provence, France.
| | - Jeanick Brisswalter
- Laboratoire Motricité Humaine Expertise Sport Santé, Université Nice Sophia Antipolis, 06205 Nice, France.
| | - Laurence Casini
- Laboratoire de Neurosciences Cognitives, Aix-Marseille Université, CNRS, LNC, 13331 Marseille, France.
| | - Arnaud Hays
- Institut des Sciences du Mouvement, Aix-Marseille Université, UMR 7287, 13288 Marseille, France.
| | - Karen Davranche
- Laboratoire de Psychologie Cognitive, Aix-Marseille Université, CNRS, LPC, 13331 Marseille, France.
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22
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Deighton K, Duckworth L, Matu J, Suter M, Fletcher C, Stead S, Ali S, Gunby N, Korsness K. Mouth rinsing with a sweet solution increases energy expenditure and decreases appetite during 60 min of self-regulated walking exercise. Appl Physiol Nutr Metab 2016; 41:1255-1261. [PMID: 27832548 DOI: 10.1139/apnm-2016-0344] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Carbohydrate mouth rinsing can improve endurance exercise performance and is most ergogenic when exercise is completed in the fasted state. This strategy may also be beneficial to increase exercise capacity and the energy deficit achieved during moderate-intensity exercise relevant to weight control when performed after an overnight fast. Eighteen healthy men (mean (SD); age, 23 (4) years; body mass index, 23.1 (2.4) kg·m-2) completed a familiarisation trial and 3 experimental trials. After an overnight fast, participants performed 60 min of treadmill walking at a speed that equated to a rating of perceived exertion of 13 ("fairly hard"). Participants manually adjusted the treadmill speed to maintain this exertion. Mouth rinses for the experimental trials contained either a 6.4% maltodextrin solution with sweetener (CHO), a taste-matched placebo (PLA), or water (WAT). Appetite ratings were collected using visual analogue scales and exercise energy expenditure and substrate oxidation were calculated from online gas analysis. Increased walking distance during CHO and PLA induced greater energy expenditure compared with WAT (mean difference (90% confidence interval); 79 (60) kJ, P = 0.035, d = 0.24; and 90 (63) kJ, P = 0.024, d = 0.27, respectively). Appetite area under the curve was lower in CHO and PLA than WAT (8 (6) mm, P = 0.042, d = 0.43; and 6 (8) mm, P = 0.201, d = 0.32, respectively). Carbohydrate oxidation was higher in CHO than PLA and WAT (7.3 (6.7) g, P = 0.078, d = 0.47; and 10.1 (6.5) g, P = 0.015, d = 0.81, respectively). This study provides novel evidence that mouth rinsing with a sweetened solution may promote a greater energy deficit during moderate-exertion walking exercise by increasing energy expenditure and decreasing appetite. A placebo effect may have contributed to these benefits.
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Affiliation(s)
- Kevin Deighton
- Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK.,Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK
| | - Lauren Duckworth
- Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK.,Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK
| | - Jamie Matu
- Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK.,Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK
| | - Matthew Suter
- Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK.,Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK
| | - Charlotte Fletcher
- Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK.,Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK
| | - Samuel Stead
- Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK.,Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK
| | - Shaho Ali
- Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK.,Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK
| | - Neil Gunby
- Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK.,Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK
| | - Keelie Korsness
- Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK.,Institute for Sport, Physical Activity & Leisure, Leeds Beckett University, Leeds LS6 3QS, UK
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