International journal of sport nutrition and exercise metabolism最新文献_第2页

Multiday Beetroot Juice Ingestion Improves Some Aspects of Neuromuscular Performance in Semi-Professional, Male Handball Players: A Randomized, Double-Blind, Placebo-Controlled, Crossover Study. 多日摄入甜菜根汁可改善半职业男子手球运动员的某些神经肌肉表现：一项随机、双盲、安慰剂对照、交叉研究。

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-11-23 DOI: 10.1123/ijsnem.2024-0113

Alejandro Muñoz, Alfonso de la Rubia, Jorge Lorenzo-Calvo, Raci Karayigit, Marta Garcés-Rimón, Miguel López-Moreno, Raúl Domínguez, Aaron T Scanlan, Álvaro López-Samanes

{"title":"Multiday Beetroot Juice Ingestion Improves Some Aspects of Neuromuscular Performance in Semi-Professional, Male Handball Players: A Randomized, Double-Blind, Placebo-Controlled, Crossover Study.","authors":"Alejandro Muñoz, Alfonso de la Rubia, Jorge Lorenzo-Calvo, Raci Karayigit, Marta Garcés-Rimón, Miguel López-Moreno, Raúl Domínguez, Aaron T Scanlan, Álvaro López-Samanes","doi":"10.1123/ijsnem.2024-0113","DOIUrl":"https://doi.org/10.1123/ijsnem.2024-0113","url":null,"abstract":"The aim of this study was to examine the effects of multiday beetroot juice ingestion on neuromuscular performance in semi-professional, male handball players. Twelve handball players competing in the second Spanish national division received 70 ml of beetroot juice (6.4 mmol of nitrate [NO3-]) or 70 ml of a placebo beetroot juice (0.04 mmol NO3-) for three consecutive days in a randomized, double-blind, crossover manner with a 1-week washout between conditions. Following supplementation in each condition, players completed a neuromuscular test battery involving handball throwing, isometric handgrip strength, countermovement jump, change-of-direction speed, and repeated-sprint assessments, with side effects also measured. Countermovement jump (4.7%; p = .038; Hedge's gav = 0.29) and isometric handgrip strength (7.8%; p = .021; gav = 0.59) were significantly superior with beetroot juice ingestion compared to the placebo. In contrast, nonsignificant differences were evident between conditions for all other neuromuscular performance variables (p > .05; gav = 0.00-0.27). Red urine production was the only side effect, demonstrating a significantly higher prevalence (p = .046) with beetroot juice ingestion. Three days of beetroot juice supplementation may be a useful nutritional strategy in semi-professional, male handball players given its ergogenic benefit to some aspects of neuromuscular performance.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"1-10"},"PeriodicalIF":3.0,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142695483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

What's (Not) in Your Supplement? An Energy and Macronutrient Analysis of Commercially Available Carbohydrate Gels. 你的补充剂里（没有）什么？市售碳水化合物凝胶的能量和宏量营养素分析。

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-11-23 DOI: 10.1123/ijsnem.2024-0174

Nicholas B Tiller, Louise M Burke, Stephanie M Howe, Jason Koop, Johanna R Ohm, Brady Burgess

{"title":"What's (Not) in Your Supplement? An Energy and Macronutrient Analysis of Commercially Available Carbohydrate Gels.","authors":"Nicholas B Tiller, Louise M Burke, Stephanie M Howe, Jason Koop, Johanna R Ohm, Brady Burgess","doi":"10.1123/ijsnem.2024-0174","DOIUrl":"10.1123/ijsnem.2024-0174","url":null,"abstract":"Carbohydrate (CHO) gels are a staple among endurance athletes. When ingested during competition, CHO gels can improve endurance performance by acting as an external energy substrate, sparing endogenous glycogen, mitigating the risk of hypoglycemia, and engaging the central nervous system via receptors in the mouth and gastrointestinal tract. However, published studies and a growing number of anecdotal reports have raised concerns about possible energy and macronutrient deficiencies in several products. We therefore performed a content analysis on CHO gels from Gu Energy, Honey Stinger, Hüma, Maurten, Näak, Precision Fuel, Science in Sport, and Spring Energy. On average, products contained significantly less energy than stated on the labels (n = 8, p = .047, large effect) but with no discrepancy in CHO content (n = 8, p = .219, medium effect). Bland-Altman analyses revealed a systematic bias toward less energy and CHO in measured samples relative to the label-derived nutritional information. Moreover, the Spring Energy product fell outside the 95% limits of agreement for both energy and CHO, containing ∼71% less energy (53 vs. 180 kcal) and ∼72% less CHO (12.5 vs. 45 g) than stated on the label. A follow-up analysis revealed similar discrepancies in several Spring Energy products from multiple lots. These findings have performance, clinical, and legal implications.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"1-9"},"PeriodicalIF":3.0,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142695486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Magnitude of the Blood Acid-Base Response, but Not Time to Peak, Is Reliable Following the Ingestion of Acute, Individualized Sodium Citrate. 摄入急性、个体化柠檬酸钠后，血液酸碱反应的幅度是可靠的，但达到峰值的时间却不可靠。

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-11-22 DOI: 10.1123/ijsnem.2024-0122

Daniel J Tinnion, Ben Dobson, Nathan Hilton, Lars R McNaughton, S Andy Sparks

{"title":"The Magnitude of the Blood Acid-Base Response, but Not Time to Peak, Is Reliable Following the Ingestion of Acute, Individualized Sodium Citrate.","authors":"Daniel J Tinnion, Ben Dobson, Nathan Hilton, Lars R McNaughton, S Andy Sparks","doi":"10.1123/ijsnem.2024-0122","DOIUrl":"https://doi.org/10.1123/ijsnem.2024-0122","url":null,"abstract":"Enhanced buffering capacity following sodium citrate (SC) ingestion may be optimized when subsequent exercise commences at individual time-to-peak (TTP) alkalosis (blood pH or bicarbonate concentration [HCO3-]). While accounting for considerable interindividual variation in TTP (188-300 min), a reliable blood alkalotic response is required for practical use. This study evaluated the reliability of blood pH, HCO3-, and sodium (Na+) following acute SC ingestion. Fourteen recreationally active males ingested 0.4 or 0.5 g/kg body mass (BM) of SC on two occasions each and 0.07 g/kg BM of sodium chloride (control) once. Blood pH and HCO3- were measured for 4 hr postingestion. Blood pH and HCO3- displayed good reliability following 0.5 g/kg BM SC (r = .819, p = .002, standardized technical error [sTE] = 0.67 and r = .840, p < .001, sTE = 0.63, respectively). Following 0.4 g/kg BM SC, blood HCO3- retained good reliability (r = .771, p = .006, sTE = 0.78) versus moderate for blood pH (r = .520, p = .099, sTE = 1.36). TTP pH was moderately reliable following 0.5 (r = .676, p = .026, sTE = 1.05) and 0.4 g/kg BM SC (r = .679, p = .025, sTE = 0.91) versus poor for HCO3- following 0.5 (r = .183, p = .361, sTE = 5.38) and 0.4 g/kg BM SC (r = .290, p = .273, sTE = 2.50). Although the magnitude of (and displacement in) blood alkalosis, particularly HCO3-, appears reliable following potentially ergogenic doses of SC, strategies based on individual TTP cannot be recommended.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"1-9"},"PeriodicalIF":3.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142692986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Acute Effects of Taurine Supplementation on Maximal Fat Oxidation and FATmax in Recreational Endurance Runners: A Randomized, Placebo-Controlled, Crossover, and Triple-Blinded Study. 补充牛磺酸对休闲耐力跑运动员最大脂肪氧化和最大脂肪率的急性影响：一项随机、安慰剂对照、交叉和三盲研究。

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-11-19 Print Date: 2025-01-01 DOI: 10.1123/ijsnem.2024-0076

Abdolrahman Ghazzagh, Alireza Naderi, Hamid Agha-Alinejad, Ali Livani, Mohsen Sarlak, Samaneh Aghamohammadi, Bryan Saunders

{"title":"Acute Effects of Taurine Supplementation on Maximal Fat Oxidation and FATmax in Recreational Endurance Runners: A Randomized, Placebo-Controlled, Crossover, and Triple-Blinded Study.","authors":"Abdolrahman Ghazzagh, Alireza Naderi, Hamid Agha-Alinejad, Ali Livani, Mohsen Sarlak, Samaneh Aghamohammadi, Bryan Saunders","doi":"10.1123/ijsnem.2024-0076","DOIUrl":"10.1123/ijsnem.2024-0076","url":null,"abstract":"Taurine (TAU) has been shown to improve time to exhaustion (TTE) and fat oxidation during exercise; however, no studies have examined the effect of acute TAU supplementation on maximal fat oxidation (MFO) and related intensity to MFO (FATmax). Our study aimed to investigate the effect of acute TAU supplementation on MFO, FATmax, VO2peak, and TTE. Eleven recreationally trained male endurance runners performed three incremental running tests. The first visit included a familiarization to the test, followed by two subsequent visits in which exercise was performed 90 min after ingestion of either 6-g TAU or placebo (PLA) using a triple-blind randomized crossover design. There was no effect of TAU on MFO (p = .89, d = -0.07, TAU: 0.48 ± 0.22 g/min; PLA: 0.49 ± 0.15 g/min or FATmax (p = .26, d = -0.66; TAU: 49.17 ± 15.86 %V˙O2peak; PLA: 56.00 ± 13.27 %V˙O2peak). TTE was not significantly altered (TAU: 1,444.8 ± 88.6 s; PLA: 1,447.6 ± 87.34 s; p = .65, d = -0.04). TAU did not show any effect on V˙O2peak in comparison with PLA (TAU: 58.9 ± 8.4 ml·kg-1·min-1; PLA: 56.5 ± 5.7 ml·kg-1·min-1, p = .47, d = 0.48). However, V˙O2 was increased with TAU at most stages of exercise with large effect sizes. The acute ingestion of 6 g of TAU before exercise did not enhance MFO, FATmax, or TTE. However, it did increase the oxygen cost of running fixed intensities in recreationally trained endurance runners.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"3-11"},"PeriodicalIF":3.0,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142465490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Postexercise Dietary Leucine Retention for Whole-Body Anabolism Is Greater With Whey Protein Isolate and Fish-Derived Protein Hydrolysate Than Nonessential Amino Acids in Trained Young Men. 与非必需氨基酸相比，训练有素的年轻男性在运动后摄入乳清蛋白异构体和鱼源性蛋白水解物对全身合成代谢所需的亮氨酸保留率更高。

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-11-11 Print Date: 2025-01-01 DOI: 10.1123/ijsnem.2024-0157

Mark Evans, Matthew J Lees, Jonathan A Aguilera, Daniel W D West, Guilherme W P da Fonseca, Miryam Amigo-Benavent, Brian P Carson, Daniel R Moore, Brendan Egan

{"title":"Postexercise Dietary Leucine Retention for Whole-Body Anabolism Is Greater With Whey Protein Isolate and Fish-Derived Protein Hydrolysate Than Nonessential Amino Acids in Trained Young Men.","authors":"Mark Evans, Matthew J Lees, Jonathan A Aguilera, Daniel W D West, Guilherme W P da Fonseca, Miryam Amigo-Benavent, Brian P Carson, Daniel R Moore, Brendan Egan","doi":"10.1123/ijsnem.2024-0157","DOIUrl":"10.1123/ijsnem.2024-0157","url":null,"abstract":"Marine-derived proteins, such as blue whiting-derived protein hydrolysates (BWPH), represent high-quality sources of dietary protein, but their ability to support postexercise anabolism is not established. The impact of BWPH on whole-body anabolism was compared with an isonitrogenous whey protein isolate (WPI) and nonessential amino acid (NEAA) control in 10 trained young males (31 ± 4 years) who, on three separate visits, performed a session of whole-body resistance exercise and then consumed, in randomized crossover fashion, BWPH, WPI, or NEAA (0.33 g/kg; 19, 33, and 0 mg/kg leucine, respectively) with L-[1-13C]leucine. Breath, blood, and urine samples were collected for 6-hr postprandial to assess dietary leucine oxidation, amino acid (AA) concentrations, and 3-methylhistidine: creatinine ratio. Peak and area under the curve concentrations for leucine, branched-chain amino acids, and essential amino acids were greater in WPI compared with BWPH (all p < .05) but with no differences in time to peak concentration. Total oxidation reflected leucine intake (WPI > BWPH > NEAA; p < .01), whereas relative oxidation was greater (p < .01) in WPI (28.6 ± 3.6%) compared with NEAA (21.3 ± 4.2%), but not BWPH (28.6 ± 8.8%). Leucine retention, a proxy for whole-body protein synthesis, was greater in WPI (185.6 ± 9.5 μmol/kg) compared with BWPH (109.3 ± 14.1 μmol/kg) and NEAA (5.74 ± 0.30 μmol/kg; both p < .01), with BWPH being greater than NEAA (p < .01). Urinary 3-methylhistidine: creatinine ratio did not differ between conditions. Both WPI and BWPH produced essential aminoacidemia and supported whole-body anabolism after resistance exercise, but a higher intake of BWPH to better approximate the leucine and EAA content of WPI may be needed to produce an equivalent anabolic response.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"24-33"},"PeriodicalIF":3.0,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142620457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of Caffeine Ingestion on Pulmonary V˙O2 Kinetics and Muscle Fatigue During Severe-Intensity Cycling Exercise. 摄入咖啡因对高强度自行车运动中肺部 V˙O2动力学和肌肉疲劳的影响

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-11-08 DOI: 10.1123/ijsnem.2024-0141

Rafael Leal Dantas Estrela, Jean de Souza Dos Santos, Paulo Cesar do Nascimento Salvador, Thiago Pereira Ventura, Gustavo Oneda, Ricardo Dantas de Lucas, Tiago Turnes, Luiz Guilherme Antonacci Guglielmo

{"title":"Effects of Caffeine Ingestion on Pulmonary V˙O2 Kinetics and Muscle Fatigue During Severe-Intensity Cycling Exercise.","authors":"Rafael Leal Dantas Estrela, Jean de Souza Dos Santos, Paulo Cesar do Nascimento Salvador, Thiago Pereira Ventura, Gustavo Oneda, Ricardo Dantas de Lucas, Tiago Turnes, Luiz Guilherme Antonacci Guglielmo","doi":"10.1123/ijsnem.2024-0141","DOIUrl":"https://doi.org/10.1123/ijsnem.2024-0141","url":null,"abstract":"Introduction: This study aimed to analyze the effect of caffeine (CAF) intake on pulmonary oxygen uptake (V˙O2) kinetics, muscle fatigue, and physiological and perceptual parameters during severe-intensity cycling exercise.Methods: Twelve physically active men (age: 26 ± 5 years; V˙O2peak: 46.7 ± 7.8 ml·kg-1·min-1) participated of this placebo (PLA)-controlled, randomized, double-blinded, and crossover design study. Participants performed on separate days (a) a ramp incremental test to determine V˙O2peak and gas exchange threshold and (b) four 8-min constant work rate tests at 60% of the difference between gas exchange threshold and maximal V˙O2peak (i.e., Δ60%) 1 hr after taking either 6 mg/kg of body mass of CAF or PLA. Before and immediately after constant work rate tests, a 5-s all-out isokinetic sprint was performed to assess the muscle torque. V˙O2 kinetics, blood lactate concentration ([La]), and rating of perceived exertion were analyzed during constant work rate tests.Results: CAF did not alter the primary time constant of V˙O2 kinetics (PLA: 38.3 ± 14; CAF: 36.7 ± 7.5 s), V˙O2 slow component (PLA: 0.5 ± 0.2; CAF: 0.5 ± 0.2 L/min), or peak torque (PLA: 144.6 ± 18.6; CAF: 143.9 ± 18.7 N·m). CAF decreased rating of perceived exertion (15.9 ± 1.8 vs. 17.0 ± 1.5 a.u.) and increased blood lactate concentration (9.0 ± 2.5 vs. 8.3 ± 2.2 mmol/L; p < .05) after constant work rate tests compared with PLA.Conclusion: CAF ingestion does not alter V˙O2 kinetics or muscle torque production during 8 min of severe-intensity cycling exercise.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"1-8"},"PeriodicalIF":3.0,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142604080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Intrasession Caffeine Intake and Cycling Performance After Accumulated Work: A Field-Based Study. 会期咖啡因摄入量与累积工作后的自行车运动表现：基于现场的研究。

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-09-26 Print Date: 2025-01-01 DOI: 10.1123/ijsnem.2024-0109

Iván R Sánchez-Redondo, Lidia B Alejo, Carlos Revuelta, Raúl de Pablos, María Ibañez, Alberto Pérez-López, Alejandro Lucia, David Barranco-Gil, Pedro L Valenzuela

{"title":"Intrasession Caffeine Intake and Cycling Performance After Accumulated Work: A Field-Based Study.","authors":"Iván R Sánchez-Redondo, Lidia B Alejo, Carlos Revuelta, Raúl de Pablos, María Ibañez, Alberto Pérez-López, Alejandro Lucia, David Barranco-Gil, Pedro L Valenzuela","doi":"10.1123/ijsnem.2024-0109","DOIUrl":"10.1123/ijsnem.2024-0109","url":null,"abstract":"Background: Preexercise caffeine intake has proven to exert ergogenic effects on cycling performance. However, whether these benefits are also observed under fatigue conditions remains largely unexplored. We aimed to assess the effect of caffeine ingested during prolonged cycling on subsequent time-trial performance in trained cyclists.Methods: The study followed a triple-blinded, randomized, placebo-controlled cross-over design. Eleven well-trained junior cyclists (17 ± 1 years) performed a field-based 8-min time trial under \"fresh\" conditions (i.e., after their usual warm-up) or after two work-matched steady-state cycling sessions (total energy expenditure∼20 kJ/kg and ∼100 min duration). During the latter sessions, participants consumed caffeine (3 mg/kg) or a placebo ∼60 min before the time trial. We assessed power output, heart rate, and rating of perceived exertion during the time trial and mood state (Brunel Mood Scale) before and after each session.Results: No significant condition effect was found for the mean power output attained during the time trial (365 ± 25, 369 ± 31, and 364 32 W for \"fresh,\" caffeine, and placebo condition, respectively; p = .669). Similar results were found for the mean heart rate (p = .100) and rating of perceived exertion (p = 1.000) during the time trial and for the different mood domains (all p > .1).Conclusions: Caffeine intake during prolonged exercise seems to exert no ergogenic effects on subsequent time-trial performance in junior cyclists. Future studies should determine whether significant effects can be found with larger caffeine doses or after greater fatigue levels.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"61-66"},"PeriodicalIF":3.0,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142346707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Erratum. Sweat Mineral-Element Responses During 7 h of Exercise-Heat Stress. 勘误。运动-热应激 7 小时期间汗液中矿物质元素的反应

IF 2.5 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-09-12 DOI: 10.1123/ijsnem.2024-0189

引用次数: 0

Menthol Mouth Rinsing Improves Cycling Performance in Trained Adolescent Males Under Heat Stress. 薄荷醇漱口可提高热应激下训练有素的青少年男子的自行车运动成绩。

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-08-30 Print Date: 2025-01-01 DOI: 10.1123/ijsnem.2024-0028

Kierstyn V Hawke, Erica H Gavel, David J Bentley, Heather M Logan-Sprenger

{"title":"Menthol Mouth Rinsing Improves Cycling Performance in Trained Adolescent Males Under Heat Stress.","authors":"Kierstyn V Hawke, Erica H Gavel, David J Bentley, Heather M Logan-Sprenger","doi":"10.1123/ijsnem.2024-0028","DOIUrl":"10.1123/ijsnem.2024-0028","url":null,"abstract":"Purpose: This study investigated the effect of menthol (MEN) mouth rinsing (MR) on cycling performance during a modified variable cycle test (M-VCT) in adolescent athletes under hot conditions (31.4 ± 0.9 °C, 23.4 ± 3.7% relative humidity).Methods: Trained adolescent male cyclists (n = 11, 16.7 ± 1.3 years, height 176.6 ± 8.8 cm, body mass 65.8 ± 11.6 kg, maximal oxygen uptake 62.97 ± 7.47 ml·kg-1·min-1) voluntarily completed three trials (familiarization and two experimental) of a 30-min M-VCT, which included five 6-min laps consisting of three 6-s accelerations and three 10-s sprints throughout each lap. In a randomized crossover design, MEN (0.01%) or placebo (PLA) (crystal-light), was swilled for 5 s before the start of each lap (total of 6 MR). Power output, distance (in kilometers), core temperature, heart rate, perceptual exertion, thermal stimulation (thermal comfort and thermal sensation), and blood lactate concentration were recorded.Results: MEN MR significantly improved M-VCT mean power output by 1.81 ± 1.57% compared to PLA (MEN, 177.8 ± 31.4 W; PLA, 174.7 ± 30.5 W, p < .001, 95% confidence interval [1.73, 4.46], d = 1.53). For maximal intermittent sprints, 6- and 10-s mean power output was significantly higher with MEN than PLA (6 s, p = .041, 95% confidence interval [0.73, 27.19], d = 0.71; 10 s, p = .002, 95% confidence interval [11.08, 35.22], d = 1.29). There was no significant difference in core temperature, heart rate, blood lactate concentration, or any perceptual measure between trials (p > .05) despite significantly higher work with MEN.Conclusion: 64% of athletes (7/11) improved M-VCT performance with MEN. The results of this investigation suggest that a MEN MR may improve power output during a sport-specific stochastic cycling task in elite adolescent male cyclists.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"34-42"},"PeriodicalIF":3.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142107405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Response Letter: Pharmacokinetic Profile of Caffeine and Its Two Main Metabolites in Dried Blood Spots After Five Different Oral Caffeine Administration Forms-A Randomized Crossover Study. 回信：咖啡因及其两种主要代谢物在五种不同咖啡因口服给药形式下干燥血斑中的药代动力学特征--一项随机交叉研究

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-08-01 Print Date: 2024-09-01 DOI: 10.1123/ijsnem.2024-0138

Chiara Tuma, Andreas Thomas, Lasse Trede, Hans Braun, Mario Thevis

引用次数: 0