International journal of sport nutrition and exercise metabolism最新文献_第3页

Letter to the Editor Regarding Tuma et al. (2024). 致编辑关于 Tuma 等人（2024 年）的信。

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.2024-0057

Jeffrey A Rothschild, Ed Maunder, Bryan Saunders

引用次数: 0

Protein Intake Distribution: Beneficial, Detrimental, or Inconsequential for Muscle Anabolism? Response to Witard & Mettler. 蛋白质摄入量的分布：对肌肉合成代谢有益、有害还是无足轻重？回应 Witard & Mettler。

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-07-10 Print Date: 2024-09-01 DOI: 10.1123/ijsnem.2024-0107

Jorn Trommelen, Andrew M Holwerda, Luc J C van Loon

引用次数: 0

An Opinion on the Interpretation of Bone Turnover Markers Following Acute Exercise or Nutrition Intervention and Considerations for Applied Research. 关于急性运动或营养干预后骨转换标志物的解释及应用研究的考虑因素的意见。

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-06-26 Print Date: 2024-09-01 DOI: 10.1123/ijsnem.2024-0003

Mark J Hutson, Ian Varley

{"title":"An Opinion on the Interpretation of Bone Turnover Markers Following Acute Exercise or Nutrition Intervention and Considerations for Applied Research.","authors":"Mark J Hutson, Ian Varley","doi":"10.1123/ijsnem.2024-0003","DOIUrl":"10.1123/ijsnem.2024-0003","url":null,"abstract":"It is important for athlete and public health that we continue to develop our understanding of the effects of exercise and nutrition on bone health. Bone turnover markers (BTMs) offer an opportunity to accelerate the progression of bone research by revealing a bone response to exercise and nutrition stimuli far more rapidly than current bone imaging techniques. However, the association between short-term change in the concentration of BTMs and long-term bone health remains ambiguous. Several other limitations also complicate the translation of acute BTM data to applied practice. Importantly, several incongruencies exist between the effects of exercise and nutrition stimuli on short-term change in BTM concentration compared with long-term bone structural outcomes to similar stimuli. There are many potential explanations for these inconsistencies, including that short-term study designs fail to encompass a full remodeling cycle. The current article presents the opinion that data from relatively acute studies measuring BTMs may not be able to reliably inform applied practice aiming to optimize bone health. There are important factors to consider when interpreting or translating BTM data and these are discussed.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"315-321"},"PeriodicalIF":3.0,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141456842","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

Caffeine Gum Improves Reaction Time but Reduces Composure Versus Placebo During the Extra-Time Period of Simulated Soccer Match-Play in Male Semiprofessional Players. 与安慰剂相比，咖啡因口香糖可改善男性半职业球员在模拟足球比赛加时赛中的反应时间，但会降低其镇定程度。

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-06-25 Print Date: 2024-09-01 DOI: 10.1123/ijsnem.2023-0220

Adam Field, Liam Corr, Laurence Birdsey, Christina Langley, Ben Marshall, Greg Wood, Mark Hearris, Diogo Martinho, Christa Carbry, Robert Naughton, James Fleming, Magni Mohr, Peter Krustrup, Mark Russell, Liam David Harper

{"title":"Caffeine Gum Improves Reaction Time but Reduces Composure Versus Placebo During the Extra-Time Period of Simulated Soccer Match-Play in Male Semiprofessional Players.","authors":"Adam Field, Liam Corr, Laurence Birdsey, Christina Langley, Ben Marshall, Greg Wood, Mark Hearris, Diogo Martinho, Christa Carbry, Robert Naughton, James Fleming, Magni Mohr, Peter Krustrup, Mark Russell, Liam David Harper","doi":"10.1123/ijsnem.2023-0220","DOIUrl":"10.1123/ijsnem.2023-0220","url":null,"abstract":"This study aimed to determine whether caffeine gum influenced perceptual-cognitive and physical performance during the extra-time period of simulated soccer match-play. Semiprofessional male soccer players (n = 12, age: 22 ± 3 years, stature: 1.78 ± 0.06 m, mass: 75 ± 9 kg) performed 120-min soccer-specific exercise on two occasions. In a triple-blind, randomized, crossover design, players chewed caffeinated (200 mg; caffeine) or control (0 mg; placebo) gum for 5 min following 90 min of soccer-specific exercise. Perceptual-cognitive skills (i.e., passing accuracy, reaction time, composure, and adaptability) were assessed using a soccer-specific virtual reality simulator, collected pre- and posttrial. Neuromuscular performance (reactive-strength index, vertical jump height, absolute and relative peak power output, and negative vertical displacement) and sprint performance (15 and 30 m) were measured at pretrial, half-time, 90 min, and posttrial. Caffeine gum attenuated declines in reaction time (pre: 90.8 ± 0.8 AU to post: 90.7 ± 0.8 AU) by a further 4.2% than placebo (pre: 92.1 ± 0.8 AU to post: 88.2 ± 0.8 AU; p < .01). Caffeine gum reduced composure by 4.7% (pre: 69.1 ± 0.8 AU to post: 65.9 ± 0.8 AU) versus placebo (pre: 68.8 ± 0.8 AU to post: 68.3 ± 0.8 AU; p < .01). Caffeine gum did not influence any other variables (p > .05). Where caffeine gum is consumed by players prior to extra-time, reaction time increases but composure may be compromised, and neuromuscular and sprint performance remain unchanged. Future work should assess caffeine gum mixes with substances like L-theanine that promote a relaxed state under stressful conditions.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"286-297"},"PeriodicalIF":3.0,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141450458","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 Phenylcapsaicin on Intraocular and Ocular Perfusion Pressure During a 30-Min Cycling Task: A Placebo-Controlled, Triple-Blind, Balanced Crossover Study. 苯卡西平对 30 分钟骑车任务中眼内压和眼灌注压的影响：一项安慰剂对照、三重盲法、平衡交叉研究。

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-06-25 Print Date: 2024-09-01 DOI: 10.1123/ijsnem.2024-0051

Paula M Lara Vázquez, María Dolores Morenas-Aguilar, Sara Chacón Ventura, Pablo Jiménez-Martínez, Carlos Alix-Fages, Amador García Ramos, Jesús Vera, Beatriz Redondo

{"title":"Effects of Phenylcapsaicin on Intraocular and Ocular Perfusion Pressure During a 30-Min Cycling Task: A Placebo-Controlled, Triple-Blind, Balanced Crossover Study.","authors":"Paula M Lara Vázquez, María Dolores Morenas-Aguilar, Sara Chacón Ventura, Pablo Jiménez-Martínez, Carlos Alix-Fages, Amador García Ramos, Jesús Vera, Beatriz Redondo","doi":"10.1123/ijsnem.2024-0051","DOIUrl":"10.1123/ijsnem.2024-0051","url":null,"abstract":"The main objective of this placebo-controlled, triple-blind, balanced crossover study was to assess the acute effects of phenylcapsaicin (PC) intake (2.5 mg) on intraocular pressure (IOP), ocular perfusion pressure (OPP), and heart rate (HR) during a 30-min cycling task performed at 15% of the individual maximal power. Twenty-two healthy young adults performed the cycling task 45 min after ingesting PC or placebo. IOP was measured with a rebound tonometer before exercise, during cycling (every 6 min), and after 5 and 10 min of recovery. OPP was assessed before and after exercise. HR was monitored throughout the cycling task. We found an acute increase of IOP levels related to PC consumption while cycling (mean difference = 1.91 ± 2.24 mmHg; p = .007, ηp2=.30), whereas no differences were observed for OPP levels between the PC and placebo conditions (mean difference = 1.33 ± 8.70 mmHg; p = .608). Mean HR values were higher after PC in comparison with placebo intake (mean difference = 3.11 ± 15.87 bpm, p = .019, ηp2=.24), whereas maximum HR did not differ between both experimental conditions (p = .199). These findings suggest that PC intake before exercise should be avoided when reducing IOP levels is desired (e.g., glaucoma patients or those at risk). Future studies should determine the effects of different ergogenic aids on IOP and OPP levels with other exercise configurations and in the long term.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"298-306"},"PeriodicalIF":3.0,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141450459","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

Energetics of a World-Tour Female Road Cyclist During a Multistage Race (Tour de France Femmes). 世界巡回赛女子公路自行车运动员在多段赛（环法自行车赛女子组）中的能量学。

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-05-25 Print Date: 2024-09-01 DOI: 10.1123/ijsnem.2023-0275

Jose L Areta, Emily Meehan, Georgie Howe, Leanne M Redman

{"title":"Energetics of a World-Tour Female Road Cyclist During a Multistage Race (Tour de France Femmes).","authors":"Jose L Areta, Emily Meehan, Georgie Howe, Leanne M Redman","doi":"10.1123/ijsnem.2023-0275","DOIUrl":"10.1123/ijsnem.2023-0275","url":null,"abstract":"Despite the increased popularity of female elite road cycling, research to inform the fueling requirements of these endurance athletes is lacking. In this case study, we report for the first time the energetics of a female world-tour cyclist competing in the 2023 Tour de France Femmes, an 8-day race of the Union Cycliste Internationale. The 29-year-old athlete presented with oligomenorrhea and low T3 before the race. Total daily energy expenditure assessed with the doubly labeled water technique was 7,572 kcal/day (∼4.3 physical activity levels), among the highest reported in the literature to date for a female. Crank-based mean maximal power was consistent with female world-tour cyclists (5 min, mean 342 W, 4.8 W/kg; 20 min 289 W, 4.1 W/kg). The average daily energy intake measured with the remote food photography method (Stage Days 1-7) was 5,246 kcal and carbohydrate intake was 13.7 g/kg (range 9.7-15.9 g/kg), and 84 g/hr during stages, and an average fat intake of 15% of daily energy intake. An estimated 2,326 kcal/day energy deficit was evidenced in a 2.2 kg decrease in body mass. Notwithstanding the high carbohydrate intake, the athlete was unable to match the energy requirements of the competition. Despite signs of energy deficiency preexisting (oligomenorrhea and low T3), and other further developing during the race (weight loss), performance was in line with that of other world-tour cyclists and a best personal performance was recorded for the last stage. This case study emphasizes the need for further research to inform energy requirements for female athletes' optimal performance and health.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"253-257"},"PeriodicalIF":3.0,"publicationDate":"2024-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141155223","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

Skimmed, Lactose-Free Milk Ingestion Postexercise: Rehydration Effectiveness and Gastrointestinal Disturbances Versus Water and a Sports Drink in Physically Active People. 运动后摄入脱脂无乳糖牛奶：与水和运动饮料相比，运动人群的补水效果和胃肠道不适。

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-05-24 Print Date: 2024-09-01 DOI: 10.1123/ijsnem.2023-0253

Luis F Aragón-Vargas, Julián C Garzón-Mosquera, Johnny A Montoya-Arroyo

{"title":"Skimmed, Lactose-Free Milk Ingestion Postexercise: Rehydration Effectiveness and Gastrointestinal Disturbances Versus Water and a Sports Drink in Physically Active People.","authors":"Luis F Aragón-Vargas, Julián C Garzón-Mosquera, Johnny A Montoya-Arroyo","doi":"10.1123/ijsnem.2023-0253","DOIUrl":"10.1123/ijsnem.2023-0253","url":null,"abstract":"Postexercise hydration is fundamental to replace fluid loss from sweat. This study evaluated rehydration and gastrointestinal (GI) symptoms for each of three beverages: water (W), sports drink (SD), and skimmed, lactose-free milk (SLM) after moderate-intensity cycling in the heat. Sixteen college students completed three exercise sessions each to lose ≈2% of their body mass. They drank 150% of body mass loss of the drink assigned in randomized order; net fluid balance, diuresis, and GI symptoms were measured and followed up for 3 hr after completion of fluid intake. SLM showed higher fluid retention (∼69%) versus W (∼40%; p < .001); SD (∼56%) was not different from SLM or W (p > .05). Net fluid balance was higher for SLM (-0.26 kg) and SD (-0.42 kg) than W (-0.67 kg) after 3 hr (p < .001), resulting from a significantly lower diuresis with SLM. Reported GI disturbances were mild and showed no difference among drinks (p > .05) despite ingestion of W (1,992 ± 425 ml), SD (1,999 ± 429 ml), and SLM (1,993 ± 426 ml) in 90 min. In conclusion, SLM was more effective than W for postexercise rehydration, showing greater fluid retention for the 3-hr follow-up and presenting with low-intensity GI symptoms similar to those with W and SD. These results confirm that SLM is an effective option for hydration after exercise in the heat.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"258-266"},"PeriodicalIF":3.0,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141093644","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

Effect of Menstrual Cycle Phase and Hormonal Contraceptives on Resting Metabolic Rate and Body Composition. 月经周期阶段和荷尔蒙避孕药对静息代谢率和身体成分的影响

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-04-23 Print Date: 2024-07-01 DOI: 10.1123/ijsnem.2023-0193

Megan A Kuikman, Alannah K A McKay, Clare Minahan, Rachel Harris, Kirsty J Elliott-Sale, Trent Stellingwerff, Ella S Smith, Rachel McCormick, Nicolin Tee, Jessica Skinner, Kathryn E Ackerman, Louise M Burke

{"title":"Effect of Menstrual Cycle Phase and Hormonal Contraceptives on Resting Metabolic Rate and Body Composition.","authors":"Megan A Kuikman, Alannah K A McKay, Clare Minahan, Rachel Harris, Kirsty J Elliott-Sale, Trent Stellingwerff, Ella S Smith, Rachel McCormick, Nicolin Tee, Jessica Skinner, Kathryn E Ackerman, Louise M Burke","doi":"10.1123/ijsnem.2023-0193","DOIUrl":"10.1123/ijsnem.2023-0193","url":null,"abstract":"The cyclical changes in sex hormones across the menstrual cycle (MC) are associated with various biological changes that may alter resting metabolic rate (RMR) and body composition estimates. Hormonal contraceptive (HC) use must also be considered given their impact on endogenous sex hormone concentrations and synchronous exogenous profiles. The purpose of this study was to determine if RMR and dual-energy X-ray absorptiometry body composition estimates change across the MC and differ compared with HC users. This was accomplished during a 5-week training camp involving naturally cycling athletes (n = 11) and HC users (n = 7 subdermal progestin implant, n = 4 combined monophasic oral contraceptive pill, n = 1 injection) from the National Rugby League Indigenous Women's Academy. MC phase was retrospectively confirmed via serum estradiol and progesterone concentrations and a positive ovulation test. HC users had serum estradiol and progesterone concentrations assessed at the time point of testing. Results were analyzed using general linear mixed model. There was no effect of MC phase on absolute RMR (p = .877), relative RMR (p = .957), or dual-energy X-ray absorptiometry body composition estimates (p > .05). There was no effect of HC use on absolute RMR (p = .069), relative RMR (p = .679), or fat mass estimates (p = .766), but HC users had a greater fat-free mass and lean body mass than naturally cycling athletes (p = .028). Our findings suggest that RMR and dual-energy X-ray absorptiometry body composition estimates do not significantly differ due to changes in sex hormones in a group of athletes, and measurements can be compared between MC phases or with HC usage without variations in sex hormones causing additional noise.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"207-217"},"PeriodicalIF":3.0,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140865174","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

Caffeine, but Not Creatine, Improves Anaerobic Power Without Altering Anaerobic Capacity in Healthy Men During a Wingate Anaerobic Test. 咖啡因（而非肌酸）能提高健康男性在 Wingate 无氧测试中的无氧功率，但不会改变其无氧能力。

IF 2.5 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-03-07 Print Date: 2024-05-01 DOI: 10.1123/ijsnem.2023-0191

Alisson Henrique Marinho, Marcos David Silva-Cavalcante, Gislaine Cristina-Souza, Filipe Antonio de Barros Sousa, Thays Ataide-Silva, Romulo Bertuzzi, Gustavo Gomes de Araujo, Adriano Eduardo Lima-Silva

{"title":"Caffeine, but Not Creatine, Improves Anaerobic Power Without Altering Anaerobic Capacity in Healthy Men During a Wingate Anaerobic Test.","authors":"Alisson Henrique Marinho, Marcos David Silva-Cavalcante, Gislaine Cristina-Souza, Filipe Antonio de Barros Sousa, Thays Ataide-Silva, Romulo Bertuzzi, Gustavo Gomes de Araujo, Adriano Eduardo Lima-Silva","doi":"10.1123/ijsnem.2023-0191","DOIUrl":"10.1123/ijsnem.2023-0191","url":null,"abstract":"There is a lack of evidence on the additional benefits of combining caffeine (CAF) and creatine (CRE) supplementation on anaerobic power and capacity. Thus, the aim of the present study was to test the effects of combined and isolated supplementation of CAF and CRE on anaerobic power and capacity. Twenty-four healthy men performed a baseline Wingate anaerobic test and were then allocated into a CRE (n = 12) or placebo (PLA; n = 12) group. The CRE group ingested 20 g/day of CRE for 8 days, while the PLA group ingested 20 g/day of maltodextrin for the same period. On the sixth and eighth days of the loading period, both groups performed a Wingate anaerobic test 1 hr after either CAF (5 mg/kg of body mass; CRE + CAF and PLA + CAF conditions) or PLA (5 mg/kg of body mass of cellulose; CRE + PLA and PLA + PLA conditions) ingestion. After the loading period, changes in body mass were greater (p < .05) in the CRE (+0.87 ± 0.23 kg) than in the PLA group (+0.13 ± 0.27 kg). In both groups, peak power was higher (p = .01) in the CAF (1,033.4 ± 209.3 W) than in the PLA trial (1,003.3 ± 204.4 W), but mean power was not different between PLA and CAF trials (p > .05). In conclusion, CAF, but not CRE ingestion, increases anaerobic power. Conversely, neither CRE nor CAF has an effect on anaerobic capacity.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"137-144"},"PeriodicalIF":2.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140065105","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

Trehalose Improved 20-min Cycling Time-Trial Performance After 100-min Cycling in Amateur Cyclists. 在业余自行车运动员进行 100 分钟自行车运动后，特利哈糖可提高他们的 20 分钟自行车计时赛成绩。

IF 3 3区医学

International journal of sport nutrition and exercise metabolism Pub Date : 2024-03-07 Print Date: 2024-07-01 DOI: 10.1123/ijsnem.2023-0241

Nathan Gobbi de Oliveira, Luana Farias de Oliveira, Rafael Pires da Silva, Tamires Nunes Oliveira, Gabriella Berwig Möller, Juliana Murasaki, Manoel Antônio Ramires, Rafael de Almeida Azevedo, Guilherme Giannini Artioli, Hamilton Roschel, Bruno Gualano, Bryan Saunders

{"title":"Trehalose Improved 20-min Cycling Time-Trial Performance After 100-min Cycling in Amateur Cyclists.","authors":"Nathan Gobbi de Oliveira, Luana Farias de Oliveira, Rafael Pires da Silva, Tamires Nunes Oliveira, Gabriella Berwig Möller, Juliana Murasaki, Manoel Antônio Ramires, Rafael de Almeida Azevedo, Guilherme Giannini Artioli, Hamilton Roschel, Bruno Gualano, Bryan Saunders","doi":"10.1123/ijsnem.2023-0241","DOIUrl":"10.1123/ijsnem.2023-0241","url":null,"abstract":"Carbohydrate (CHO) supplementation during endurance exercise can improve performance. However, it is unclear whether low glycemic index (GI) CHO leads to differential ergogenic and metabolic effects compared with a standard high GI CHO. This study investigated the ergogenic and metabolic effects of CHO supplementation with distinct GIs, namely, (a) trehalose (30 g/hr), (b) isomaltulose (30 g/hr), (c) maltodextrin (60 g/hr), and (d) placebo (water). In this double-blind, crossover, counterbalanced, placebo-controlled study, 13 male cyclists cycled a total of 100 min at varied exercise intensity (i.e., 10-min stages at 1.5, 2.0, and 2.5 W/kg; repeated three times plus two 5-min stages at 1.0 W/kg before and after the protocol), followed by a 20-min time trial on four separated occasions. Blood glucose and lactate (every 20 min), heart rate, and ratings of perceived exertion were collected throughout, and muscle biopsies were taken before and immediately after exercise. The results showed that trehalose improved time-trial performance compared with placebo (total work done 302 ± 39 vs. 287 ± 48 kJ; p = .01), with no other differences between sessions (all p ≥ .07). Throughout the 100-min protocol, blood glucose was higher with maltodextrin compared with the other supplements at all time points (all p < .05). Heart rate, ratings of perceived exertion, muscle glycogen content, blood glucose, and lactate were not different between conditions when considering the 20-min time trial (all p > .05). Trehalose supplementation throughout endurance exercise improved cycling performance and appears to be an appropriate CHO source for exercise tasks up to 2 hr. No ergogenic superiority between the different types of CHO was established.","PeriodicalId":14334,"journal":{"name":"International journal of sport nutrition and exercise metabolism","volume":" ","pages":"199-206"},"PeriodicalIF":3.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140065106","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