Journal of the International Society of Sports Nutrition最新文献

{"title":"Contemporary educational and behavior change strategies improve dietary practices around a match in professional soccer players.","authors":"Jennie L Carter, David J Lee, Jonathan S J Fenner, Mayur K Ranchordas, Matthew Cole","doi":"10.1080/15502783.2024.2391369","DOIUrl":"10.1080/15502783.2024.2391369","url":null,"abstract":"<p><strong>Background: </strong>The importance of nutrition in optimizing the health and performance of professional soccer players has been well established. Despite published practical recommendations for the dietary requirements for professional soccer players, many players fail to meet these guidelines. Thus, the primary purpose of this study was to assess the impact of targeted nutritional education and behavior change interventions on dietary intake in professional football players. Additionally, previous research within this population has reported elevations in resting metabolic rate (RMR) following match-play. Therefore, a further aim of this study was to examine whether any changes in dietary intake would influence RMR following match-play.</p><p><strong>Methods: </strong>Twenty players from the professional development phase in an English Premier League club (age: 18.4 ± 1.0 years; body mass: 76.1 ± 6.0 kg; stature: 1.80 ± 0.07 m) were randomly assigned to an \"Intervention\" (INT) group (<i>n</i> = 10), who received numerous nutritional education and behavior change interventions, or a \"Control\" (CON) group (<i>n</i> = 10), who received no nutrition support. Dietary intake was assessed daily throughout the match-week (Match Day (MD)-2, MD-1, MD, MD + 1, and MD + 2), whilst RMR was assessed on MD-1, MD + 1, and MD + 2. Statistical analyses on the intervention effects on dietary intake and RMR were carried out using a two factor (group and day) analysis of variance (ANOVA) with a subsequent Bonferroni post-hoc test.</p><p><strong>Results: </strong>Mean energy (3393 ± 852 vs. 2572 ± 577 kcal · day<sup>-1</sup>) and CHO (5.36 ± 1.9 vs. 3.47 ± 1.1 g · kg<sup>-1</sup> BW · day<sup>-1</sup>) intake was significantly higher (<i>p</i> < 0.001) in the INT vs. CON group. Furthermore, the INT group implemented nutrition periodization practices as CHO intake was significantly increased on MD-1 (7.0 ± 1.7 g · kg<sup>-1</sup> BM · day<sup>-1</sup>), MD (7.1 ± 1.4 g · kg<sup>-1</sup> BM · day<sup>-1</sup>) and MD + 1 (5.1 ± 0.8 g · kg<sup>-1</sup> BM · day<sup>-1</sup>). However, the CON group did not periodize their CHO intake and failed to meet the CHO recommendations on MD-1, MD, and MD + 1 (<4 g · kg<sup>-1</sup> BM · day<sup>-1</sup>). Compared to MD-1, the RMR increased on MD + 1 and MD + 2 in both groups, although it was only statistically significant for the INT group (MD + 1 =  +243 kcal · day<sup>-1</sup>; MD + 2 =  +179 kcal · day<sup>-1</sup>).</p><p><strong>Conclusions: </strong>The implementation of targeted nutritional education and behavior change interventions resulted in improved dietary practices in professional football players and enabled better adherence to recommended guidelines. However, despite this, RMR was still elevated in the 24-48 h following match play. Thus, in order to optimize recovery, this finding further reinforces the need for professional football players to adopt strategies to meet energy, and particularly CHO, r","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"21 1","pages":"2391369"},"PeriodicalIF":4.5,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11321108/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141917042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of mixed protein supplementation on golf performance and muscle function: a randomized, double-blind, placebo-controlled study.","authors":"Ji-Won Seo, Shu Jiang, Soyoung Ahn, Yu Seon Kang, Yunho Sung, Xinxing Li, Parivash Jamrasi, Eun Mi Sun, Jihee Yoo, Byung-Yong Kim, Hyunsu Sim, Wook Song","doi":"10.1080/15502783.2024.2393368","DOIUrl":"10.1080/15502783.2024.2393368","url":null,"abstract":"<p><strong>Background: </strong>As a relatively novel approach to enhancing skeletal muscle health, mixed protein supplementation has shown similar responses to whey protein. However, no previous studies have examined its impact on golf swing performance. This study aimed to examine the effect of mixed protein supplementation on the swing performance and muscle strength of casual golfers.</p><p><strong>Methods: </strong>Sixty participants with a handicap of less than 20 were recruited and randomly assigned to a double-blind, placebo-controlled study design. The participants were divided into two groups: a mixed protein group (MG, <i>n</i> = 30), and a placebo control group (CG, <i>n</i> = 30). They were instructed to ingest either a supplement containing casein calcium, whey protein, and isolated pea protein, or a placebo, once daily for 8 weeks. Pre- and posttests consisted of anthropometric measurements, muscle strength (isokinetic knee and trunk strength, and handgrip strength), 2-minute push-ups, balance, and golf swing performance using a driver and 7-iron.</p><p><strong>Results: </strong>After the 8-week supplementation period, ANCOVA, using baseline values as covariates, revealed significant differences for driver distance (<i>p</i> = .004) and driver ball speed (<i>p</i> < .001). MG significantly increased driver distance by 5.17 ± 12.8 m (<i>p</i> = .046), driver ball speed by 1.36 ± 2.87 m/s (<i>p</i> = .021). Additionally, significantly improvements were observed in hand grip strength (+2.12 ± 3.47 kg, <i>p</i> = .004), two-minute push-ups (+4.89 ± 8.14 reps, <i>p</i> = .004), and balance score (-0.37 ± 0.69 min, <i>p</i> = .009). No significant differences were observed in body composition parameters (<i>p</i> > .05).</p><p><strong>Conclusion: </strong>The intake of a mixed protein containing both animal and plant proteins had positive effects on golf performance and muscle function. Therefore, mixed proteins may represent a safe and effective approach to enhancing skeletal muscle health in golf players.</p>","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"21 1","pages":"2393368"},"PeriodicalIF":4.5,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11340221/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142017883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The associations between calorie tracking, body image dissatisfaction, eating disorders, and menstrual cycle characteristics in resistance-trained athletes.","authors":"Kimberly SantaBarbara, Eric Helms, Nigel Harris","doi":"10.1080/15502783.2024.2433743","DOIUrl":"10.1080/15502783.2024.2433743","url":null,"abstract":"<p><strong>Background: </strong>While body image dissatisfaction (BID) and eating disorders (EDs) are relatively common in athletes (ranging from 11% to 67% of athletes, depending on the sport) [1], they are also prevalent in weight-class restricted sports (a common format in strength sports), and among physique athletes [2]. These athletes manipulate their nutrition to reach aesthetic or body weight standards and, in that process, may undergo prolonged periods of low energy availability. Low energy availability, defined as consuming insufficient energy for one's lean mass and exercise activity, can lead to Relative Energy Deficiency in sport (REDs), a syndrome that can impact menstrual cycle (MC) symptoms (and many other aspects of physiology and psychology) [3]. There has not been an investigation into the relationships between these resistance-trained (RT) athletes' nutritional habits, MC-related symptoms, BIDs, and EDs.</p><p><strong>Methods: </strong>A survey was implemented to explore the dieting habits, MC characteristics, BID, and EDs in RT females.</p><p><strong>Results: </strong>64.6% (<i>n</i> = 469) of participants reported tracking calories, with a slightly higher percentage of competitive athletes tracking calories 71.8% (<i>n</i> = 181) than recreational-level athletes. Competitive athletes were significantly more likely to track calories than recreational-level athletes (<i>p</i> = 0.003). When asked what the primary purpose of calorie restriction was, most participants selected weight loss for aesthetic purposes 58.8% (<i>n</i> = 356). Competitive athletes were less likely to select weight loss for aesthetic purposes 35.7% (<i>n</i> = 77), but weight loss for the purpose of a weight class-based sport was higher at 43.5% (<i>n</i> = 94). There were no significant associations between BID and MC characteristics or most MC symptoms and limited associations between EDs and MC characteristics and symptoms.</p><p><strong>Conclusion: </strong>RT athletes exhibited a higher prevalence of calorie tracking than the general population. Competitive RT athletes were less likely to calorie restrict for aesthetic purposes than non-athletes, but more likely to calorie restrict for the purpose of weight-class-based sports. There were limited significant associations between BID and MC characteristics or MC symptoms, as well as between EDs and MC characteristics. However, there was a significant association between amenorrhea and EDs, which aligns with previous research in this area. Both BID and EDs were significantly associated with MC-based mental health effects; this is likely due to the interconnected nature of mental health concerns, such as EDs with depression and anxiety.</p>","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"21 1","pages":"2433743"},"PeriodicalIF":4.5,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11587730/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142695088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of probiotics and casein supplementation on aerobic capacity parameters of male soccer players.","authors":"Babak Imanian, Mohammad Hemmatinafar, Farhad Daryanoosh, Negar Koureshfard, Reza Sadeghi, Alireza Niknam, Rasoul Rezaei, Ali Qashqaei","doi":"10.1080/15502783.2024.2382165","DOIUrl":"10.1080/15502783.2024.2382165","url":null,"abstract":"&lt;p&gt;&lt;strong&gt;Background: &lt;/strong&gt;In the realm of sports science, nutrition is a well-established pillar for athletes' training, performance, and post-workout recovery. However, the role of gut microbiota, often overlooked, is a novel and intriguing aspect that can significantly impact athletic performance. With this in mind, our study ventures into uncharted territory, investigating the effect of probiotic and casein supplementation on the aerobic capacity of male soccer players.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Method: &lt;/strong&gt;A double-blinded and placebo-controlled study was conducted with 44 male soccer players (Age: 22.81 ± 2.76 yr, Height: 177.90 ± 6.75 cm, Weight: 67.42 ± 8.44 kg). The participants were subjected to the Bruce test in the beginning; then, they were randomly divided into four groups, each consisting of 11 people: probiotics (PRO), casein (CAS), probiotics with casein (PRO+CAS), and placebo (PLA). PRO group was given one probiotic capsule (containing strains of &lt;i&gt;Lactiplantibacillus plantarum&lt;/i&gt; BP06, Lacticaseibacillus casei BP07, &lt;i&gt;Lactobacillus acidophilus&lt;/i&gt; BA05, &lt;i&gt;Lactobacillus delbrueckii&lt;/i&gt; BD08 &lt;i&gt;bulgaricus&lt;/i&gt;, &lt;i&gt;Bifidobacterium infantis&lt;/i&gt; BI04, &lt;i&gt;Bifidobacterium longum&lt;/i&gt; BL03, &lt;i&gt;Bifidobacterium breve&lt;/i&gt; BB02 and &lt;i&gt;Streptococcus salivarius thermophilus&lt;/i&gt; BT01, with a total dose of 4.5 × 10&lt;sup&gt;11&lt;/sup&gt; CFU) during dinner, while the CAS group consumed 20 grams of casein powder 45 minutes before bed. The PRO+CAS group was given one probiotic capsule during dinner and 20 grams of casein powder 45 minutes before bed. The participants in the PLA group were given one red capsule (containing 5 grams of starch) during dinner. All participants were instructed to take the supplements only on training days, three times a week for four weeks. The maximal oxygen consumption (VO&lt;sub&gt;2max&lt;/sub&gt;), Ventilatory Threshold (VT), Time-to-exhaustion (TTE), Respiratory Compensation Point (RCP), Isocapnic area Time (Time-IC), Isocapnic area oxygen consumption (VO&lt;sub&gt;2&lt;/sub&gt;-IC), and Hypocapnic Hyperventilation area Time (Time-HHV), after the Bruce test were Measured. All data were analyzed using SPSS Windows software, mixed repeated measure ANOVA, and Bonferroni post hoc test at &lt;i&gt;p&lt;/i&gt; &lt; 0.05 level.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Results: &lt;/strong&gt;The current study's findings illustrated that, after the intervention, TTE (&lt;i&gt;p&lt;/i&gt; = 0.01) and RCP (&lt;i&gt;p&lt;/i&gt; = 0.01) were significantly improved in PRO+CAS compared to the PLA group. No significant difference was observed between PRO and PLA (&lt;i&gt;p&lt;/i&gt; = 0.52), PRO and CAS (&lt;i&gt;p&lt;/i&gt; = 0.999), PRO and PRO+CAS (&lt;i&gt;p&lt;/i&gt; = 0.9), CAS and PLA (&lt;i&gt;p&lt;/i&gt; = 0.65), CAS and PRO+CAS (&lt;i&gt;p&lt;/i&gt; = 0.73) in TTE. In addition, no significant difference was observed between PRO and CAS (&lt;i&gt;p&lt;/i&gt; = 0.999), PRO and PLA (&lt;i&gt;p&lt;/i&gt; = 0.40), PRO and PRO+CAS (&lt;i&gt;p&lt;/i&gt; = 0.999), CAS and PLA (&lt;i&gt;p&lt;/i&gt; = 0.263), CAS and PRO+CAS (&lt;i&gt;p&lt;/i&gt; = 0.999) in RCP. Time-HHV was significantly higher in PRO+CAS (&lt;i&gt;p&lt;/i&gt; = 0.000) and CAS (&lt;i&gt;p&lt;/i&gt; = 0","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"21 1","pages":"2382165"},"PeriodicalIF":4.5,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11268215/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141748491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing performance through biochemical monitoring and nutritional support in female weightlifters during pre-competition weight reduction: a randomized trial.","authors":"Liang Yu, Liang Cheng","doi":"10.1080/15502783.2024.2435542","DOIUrl":"10.1080/15502783.2024.2435542","url":null,"abstract":"<p><strong>Objective: </strong>Weight reduction is a common practice among female weightlifters before competitions to qualify for specific weight classes. However, this process can adversely affect their physical performance and health. This study aimed to investigate the impact of physiological and biochemical monitoring and nutritional support on the competitive state of female weightlifters during the pre-competition weight reduction period.</p><p><strong>Methods: </strong>A randomized controlled trial was conducted with 28 female weightlifters from Sichuan Province, China, randomly assigned to the experimental group (<i>n</i> = 14) or the control group (<i>n</i> = 14). Both groups followed their regular training schedules. The experimental group received personalized nutritional monitoring and supplementation, including detailed assessments, dietary logs, weekly consultations, and targeted supplements based on biochemical indicators and training needs. The control group continued with their standard diet and training without additional interventions. Serum indicators, fatigue scales, and Pittsburgh Sleep Quality Index (PSQI) scores were monitored (a total of 5 tests).</p><p><strong>Results: </strong>The experimental group exhibited a significant reduction in creatine kinase levels by the fourth week compared to both baseline and the first week (<i>p</i> < 0.05), and maintained higher levels of testosterone, testosterone/cortisol ratio, and hemoglobin than the control group from the second week onwards (<i>p</i> < 0.05). Conversely, the control group showed an increase in creatine kinase and a decrease in testosterone and testosterone/cortisol ratio over the same period (<i>p</i> < 0.05). By the fourth week, the experimental group also reported lower fatigue and better sleep quality, as indicated by lower PSQI scores, compared to the control group (<i>p</i> < 0.001).</p><p><strong>Conclusion: </strong>Personalized nutritional supplementation has an improving effect on biochemical indicators, fatigue, and sleep quality in female weightlifters during the pre-competition weight reduction period. Implementing biochemical monitoring and personalized nutritional support during this period is a key strategy for enhancing the competitive performance of female weightlifters.</p>","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"21 1","pages":"2435542"},"PeriodicalIF":4.5,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11610348/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142739837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of the diet, weight-loss behavior, and nutritional knowledge of athletes and coaches in weightclass sports: influence of a coach's nutritional knowledge on athletes.","authors":"Jun-Young Sung,Jung-Hoon Lee,Kyu-Lim Lee","doi":"10.1080/15502783.2024.2405159","DOIUrl":"https://doi.org/10.1080/15502783.2024.2405159","url":null,"abstract":"BACKGROUNDThis study was conducted to investigate the nutritional knowledge of elite athletes undergoing weight loss and to identify differences in weight-loss strategies according to nutritional knowledge.METHODSThe participants included 22 coaches and 88 elite athletes registered under the same affiliation. The survey involved translating the General Nutrition Knowledge Questionnaire (GNKQ), and interviews were used to confirm the diet and weight loss patterns of the athletes. The coaches and athletes were divided into high-rank (12 coaches and 57 athletes) and low-rank (10 coaches and 31 athletes) groups based on GNKQ scores. Paired t-tests, correlation analysis, and logistic regression analysis were performed.RESULTSGNKQ results showed significant differences between high-ranking and low-ranking coaches (p < 0.001). Furthermore, a significant difference in nutrition knowledge scores was also noticed between athletes with high-ranking and low-ranking coaches (p < 0.001). A strong correlation was observed between the GNKQ scores of coaches and athletes (r = 0.369; p < 0.001). The nutritional knowledge of coaches was also correlated with weight-loss strategies (weight loss attempt frequency; r = -0.235; p = 0.027; weight loss duration; r = -0.268; p = 0.012). Additionally, differences were observed in the intake of all nutrients (carbohydrates, proteins, and fat) in the diets of athletes (p < 0.001).CONCLUSIONOur study suggests that the nutritional knowledge of coaches indirectly affects athletes. Coaches have significant influence over athletes and possess experience with diet and weight-loss patterns. This insight should be effectively utilized to enhance the training and performance of athletes and coaches.","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"26 1","pages":"2405159"},"PeriodicalIF":5.1,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142266468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Proceedings of the Twenty-First International Society of Sports Nutrition (ISSN) Conference and Expo.","authors":"Chad M Kerksick, Guillermo Escalante, Bill Campbell, Douglas Kalman, Jose Antonio","doi":"10.1080/15502783.2024.2374669","DOIUrl":"10.1080/15502783.2024.2374669","url":null,"abstract":"","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"21 sup1","pages":"2374669"},"PeriodicalIF":4.5,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11229765/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141534698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of different phenylcapsaicin doses on resistance training performance, muscle damage, protein breakdown, metabolic response, ratings of perceived exertion, and recovery: a randomized, triple-blinded, placebo-controlled, crossover trial.","authors":"Pablo Jiménez-Martínez, Pedro Jesús Cornejo-Daza, Juan Sánchez-Valdepeñas, Iván Asín-Izquierdo, Clara Cano-Castillo, Carlos Alix-Fages, Fernando Pareja-Blanco, Juan C Colado","doi":"10.1080/15502783.2023.2204083","DOIUrl":"10.1080/15502783.2023.2204083","url":null,"abstract":"<p><strong>Background: </strong>The aim of this study was to explore the effects of a low dose (LD) of 0.625 mg and a high dose (HD) of 2.5 mg of phenylcapsaicin (PC) on full squat (SQ) performance, active muscle (RPE-AM) and overall body (RPE-OB) ratings of perceived exertion, muscle damage, protein breakdown, metabolic response, and 24-h recovery in comparison to placebo (PLA).</p><p><strong>Method: </strong>Twenty-five resistance-trained males (age = 21.00 ± 2.15 years, SQ 1-repetition maximum [1RM] normalized = 1.66 ± 0.22 kg) were enrolled in this randomized, triple-blinded, placebo-controlled, crossover trial. Participants completed 2 weekly sessions per condition (LD, HD, and PLA). The first session consisted of pre-blood testing of lactate, urea, and aspartate aminotransferases (AST) and 2 SQ repetitions with 60% 1RM followed by the resistance exercise protocol, which consisted of SQ sets of 3 × 8 × 70% 1RM monitoring lifting velocity. RPE-OB and RPE-AM were assessed after each set. After the first session, 2 SQ repetitions with 60% 1RM were performed, and blood lactate and urea posttests were collected. After 24 h, AST posttest and 1 × 2 × 60% 1RM were determined as biochemical and mechanical fatigue outcomes.</p><p><strong>Results: </strong>HD reported significant differences for RPE-AM, AST, and SQ performance compared to LD and PLA. Post-hoc analyses revealed that HD attained faster velocities in SQ than LD (<i>p</i> = 0.008). HD induced a lower RPE-AM when compared with LD (<i>p</i> = 0.02) and PLA (<i>p</i> = 0.004). PLA resulted in higher AST concentrations at 24-h post than HD (<i>p</i> = 0.02). No significant differences were observed for the rest of the comparisons.</p><p><strong>Conclusions: </strong>This study suggests that PC may favorably influence SQ performance, RPE-AM, and muscle damage compared to PLA. However, HD exhibited most of the biochemical and mechanical anti-fatigue effects instead of LD.</p>","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"20 1","pages":"2204083"},"PeriodicalIF":4.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/aa/43/RSSN_20_2204083.PMC10124973.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9386824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effects of L-Citrulline and Glutathione on Endurance performance in young adult trained males.","authors":"Hannah E Cabre, Casey E Greenwalt, Lacey M Gould, Abbie E Smith-Ryan","doi":"10.1080/15502783.2023.2206386","DOIUrl":"10.1080/15502783.2023.2206386","url":null,"abstract":"<p><strong>Background: </strong>Citrulline may amplify the effects of L-arginine and nitric oxide concentration, which may augment vasodilation and blood flow, thereby enhancing aerobic exercise performance. The purpose of this randomized, double-blind, placebo-controlled crossover study was to investigate effects of L-citrulline + Glutathione on aerobic exercise performance and blood flow in well-trained men.</p><p><strong>Methods: </strong>Twenty-five males (Mean ± SD; Age: 22.2 ± 2.4 yrs; Height: 177.0 ± 4.8 cm; Weight: 75.3 ± 6.9 kg) were randomly assigned to the L-citrulline + Glutathione (Setria Performance Blend: SPB; L-citrulline [2 g] + glutathione [200 mg], 6 capsules) or placebo (PL; 3.1 g cellulose, 6 capsules) group. Participants performed a maximal oxygen consumption treadmill test to determine peak velocity (PV) and returned after eight days of ingesting either PL or SPB. Three timed treadmill runs to exhaustion (TTE) were performed at 90%, 100%, and 110% PV. Brachial artery blood flow and vessel diameter were assessed using ultrasound at 1-hr prior to exercise (1hrPrEX), after each exercise bout, immediately post-exercise (immediate PEX), and 30 minutes post exercise (30minPEX) at visits 2 and 4. Blood analytes were assessed via venous blood draws at visit 1, visit 3, and 1hrPEX, immediate PEX, and 30minPEX at visits 2 and 4. After a 14-day washout, participants repeated the same procedures, ingesting the opposite treatment. Separate repeated measures ANOVAs were performed for TTE, vessel diameter, blood flow, and blood analytes.</p><p><strong>Results: </strong>Blood flow was significantly augmented 30minPEX (<i>p</i> = 0.04) with SPB in comparison with PL. L-citrulline and L-arginine plasma concentrations were significantly elevated immediately PEX (<i>p</i> = 0.001) and 30-minPEX (<i>p</i> = 0.001) following SPB in comparison to PL.</p><p><strong>Conclusion: </strong>Acute ingestion of SPB after eight days may enhance blood flow, L-citrulline, and L-arginine plasma concentrations after high-intensity exercise, which may enhance performance.</p><p><strong>Clinical trial registration: </strong>[https://clinicaltrials.gov/ct2/show/nct04090138], identifier [NCT04090138].</p>","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"20 1","pages":"2206386"},"PeriodicalIF":5.1,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10134954/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9455787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the reliability and educational quality of YouTube™ videos on sport nutrition topics.","authors":"Anna Kiss, Sándor Soós, Ágoston Temesi, Brigitta Unger-Plasek, Zoltán Lakner, Orsolya Tompa","doi":"10.1080/15502783.2023.2278632","DOIUrl":"10.1080/15502783.2023.2278632","url":null,"abstract":"<p><strong>Background: </strong>YouTube is one of the most widespread social media channels, which is of growing importance in science communication and health education. The validity of medical and health-related information available on YouTube cannot be assured, and videos often contain potentially misleading or inaccurate information. Communication on sport nutrition may have a profound effect on the change in nutrition behavior among athletes, so evidence-based nutrition information must reach athletes. The main goal of the research is to evaluate the quality, reliability, and applicability of sports nutrition YouTube videos as educational material for athletes.</p><p><strong>Methods: </strong>A descriptive cross-sectional design was applied, and a systematic search was performed on YouTube. The quality and reliability of the videos were evaluated by applying the most frequently used and highly reliable scoring systems in the literature (e.g., DISCERN, Global Quality Score, and JAMA criteria) and a sports nutrition-specific scoring system (SNSS). Descriptive statistical analyses, two-sample t-test, Spearman correlation, Kruskal - Wallis, and Mann - Whitney U test were used to evaluate the results. A total of 114 YouTube videos met the inclusion criteria.</p><p><strong>Results: </strong>In 25% of the videos, the sports nutrition information was presented by a dietitian, while in two-thirds, coaches and athletes and other professionals shared sports nutrition knowledge. In terms of video content, the three most common topics were nutrition and health (33%), special diets (21%), and the training diet (17%). For the majority of the videos that received low GQS, JAMAS, DISCERN, and SNSS scores, the accuracy and quality of the analyzed YouTube videos on sports nutrition were inadequate. Videos uploaded by dietitians achieved significantly higher DISCERN, JAMAS, GQS, and SNSS scores. The GQS, SNSS, and DISCERN scores of videos from sports organizations, nonprofit organizations, and independent user sources were lower compared to videos uploaded by academic and professional organizations. Popular sport nutrition videos among users that contain personal stories or the experiences of athletes were deemed less reliable by experts or showed lower educational quality. Henceforth, we found a negative correlation between video popularity and JAMAS, GQS, and SNSS scores.</p><p><strong>Conclusion: </strong>This study revealed that sports nutrition videos on the YouTube video platform show low accuracy and reliability. Professionals working with athletes need to consider misconceptions from sports nutrition videos in their nutrition counseling practice. Due to the popularity of the videos, professionals and professional organizations could use YouTube as an online educational tool to increase the nutrition knowledge of athletes.</p>","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"20 1","pages":"2278632"},"PeriodicalIF":5.1,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10653641/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89718801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}