Journal of the International Society of Sports Nutrition最新文献

{"title":"Effects of protein supplementation during pilates training on body composition, core muscle endurance, and joint flexibility in trained women: a randomized controlled trial.","authors":"Christina Karpouzi, Antigoni Kypraiou, Vassilis Mougios, Anatoli Petridou","doi":"10.1080/15502783.2025.2472891","DOIUrl":"10.1080/15502783.2025.2472891","url":null,"abstract":"<p><strong>Background: </strong>Pilates is a popular type of exercise, aimed at improving core muscle strength and endurance, core stability, and joint flexibility through a variety of whole-body exercises. Research has shown that Pilates improves body composition, muscle endurance, and joint flexibility. Adequate protein intake is a key factor in supporting the adaptive response of skeletal muscle to exercise training. However, whether protein supplementation augments the adaptations to Pilates training remains unknown. Thus, the aim of the present study was to investigate the effects of protein supplementation during Pilates training on body composition, core muscle endurance, and joint flexibility in trained women.</p><p><strong>Methods: </strong>Nineteen Pilates-trained women (31 ± 9 y) performed 10 weeks of Pilates training using the Reformer and Cadillac apparatuses, at least 2 times per week. Participants were randomly allocated to either a placebo (<i>n</i> = 10) or protein supplementation group (<i>n</i> = 9) in a quadruple-blind (participants, intervention providers, investigators, and outcome assessors) design. Participants received 0.6 g of maltodextrin or whey protein per kg body weight daily, respectively. Habitual dietary intake was monitored throughout the study. Before and after the intervention, anthropometric measures (body weight, body mass index, waist and hip circumferences), body composition [through full-scan dual-energy X-ray absorptiometry (DXA) and multifrequency bioelectrical impedance analysis (BIA)], core muscle endurance (through the McGill's torso muscular endurance test battery), and joint flexibility (through the sit-and-reach test) were assessed. Data were analyzed by 2-way ANOVA (supplement × time) with repeated measures on time. Common DXA and BIA variables (whole-body fat and lean mass) were compared through paired Student's t tests and subjected to Pearson's correlation analysis. The level of statistical significance was set at α = 0.05.</p><p><strong>Results: </strong>Participants received, on average, 1.3 g protein/kg body weight/day from their habitual diet. After 10 weeks of Pilates training and regardless of supplementation, body fat (assessed by BIA) and hip circumference decreased; lean mass, total water, and extracellular water (by BIA) increased; and arm lean mass, trunk bone mineral content, and trunk bone area (by DXA) increased (all <i>p</i> < 0.05). The common BIA and DXA variables were highly correlated (<i>r</i> > 0.78, <i>p</i> < 0.001) and did not differ pre-intervention (<i>p</i> > 0.1), although they differed post-intervention (<i>p</i> < 0.001), with BIA overestimating lean mass compared with DXA. Core muscle endurance and joint flexibility increased with training (<i>p</i> < 0.05), with no effect of supplementation.</p><p><strong>Conclusion: </strong>Ten weeks of Pilates training improved core muscle endurance, joint flexibility, and aspects of body composition in healthy trained women, ","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"22 1","pages":"2472891"},"PeriodicalIF":4.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11869336/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143516024","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":"Impact of sports nutrition education on awareness and knowledge among physical education majors and workers.","authors":"Kyu-Lim Lee, Jun-Young Sung","doi":"10.1080/15502783.2025.2498485","DOIUrl":"https://doi.org/10.1080/15502783.2025.2498485","url":null,"abstract":"<p><strong>Background: </strong>This study aimed to investigate the current status and perceptions of nutrition education among sports majors and workers in Korea to provide information that can be utilized in educational curriculums of universities and other external institutions for sports nutrition education.</p><p><strong>Methods: </strong>This study included Korean adults aged over 19 years who majored in physical education at a university. The questionnaire consisted of questions regarding demographic characteristics (10 questions), nutritional awareness (20 questions), and the General Nutrition Knowledge Questionnaire (GNKQ, 88 questions). This survey was conducted entirely online using simple random sampling, and 706 responses were included in the final data analysis. An independent sample t-test and one-way ANOVA were conducted to confirm group differences. Post hoc pairwise comparisons with a Tukey adjustment were conducted. The statistical significance level for all data was set at <i>p</i> < 0.05.</p><p><strong>Results: </strong>Approximately 42% of the participants completed nutrition classes at the university and 19.4% at other institutions. The assessment of their nutritional knowledge level was 3.06   ±   1.08 points (<i>p</i> < 0.001) on a 5-point Likert scale, with participants who had completed nutrition classes scoring higher (<i>p</i> < 0.001).The GNKQ also found that participants who received nutrition classes scored higher in all sections, including the total scores (total score, <i>p</i> = 0.011; one section, <i>p</i> = 0.030; three sections, <i>p</i> < 0.001).</p><p><strong>Conclusion: </strong>Nutrition is a crucial aspect that cannot be excluded from physical education. Therefore, government and university institutions must increase lecture hours and hands-on opportunities by incorporating diverse educational curricula in physical education-related departments. This approach will help create a safer and more systematic sports environment and positively impact healthcare policies.</p>","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"22 1","pages":"2498485"},"PeriodicalIF":4.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12042232/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143971175","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":"Exploring the non-targeted metabolomic landscape in endurance-trained runners following 10 weeks of different dietary patterns and concomitant training.","authors":"Anna Maria Kripp, Ammar Tahir, Agnes Draxler, Maria Speiser, Karl-Heinz Wagner, Daniel König","doi":"10.1080/15502783.2025.2536139","DOIUrl":"10.1080/15502783.2025.2536139","url":null,"abstract":"<p><strong>Introduction: </strong>Established guidelines recommend carbohydrate-rich diets to optimize performance in endurance sports. However, alternative dietary strategies, such as the low-arbohydrate and high-fat (LCHF) diet, have gained increasing attention due to their potential to influence metabolic flexibility and endurance performance outcomes. In this study, we aim to investigate the combined effects of a LCHF diet, along with low glycemic index (LOW-GI) and high glycemic index (HIGH-GI) diets, in conjunction with regular endurance exercise, on the metabolomic profiles of recreational runners. The classification into LOW-GI and HIGH-GI groups is based on the premise that metabolic regulation, particularly insulin response and glucose metabolism, differs significantly between the consumption of high-glycemic and low-glycemic foods.</p><p><strong>Methods: </strong>The participants (<i>n</i> = 49, 28 ± 4 years, BMI: 24.2 ± 2.8 kg/m2, VO2 peak: 56 ± 8 ml/min/kg) were randomly allocated to a LOW-GI (<i>n</i> = 16), a HIGH-GI (<i>n</i> = 16) or a LCHF (<i>n</i> = 17) diet for 10 weeks and the same endurance training intervention. Fasting plasma samples were collected both pre- and post-intervention and were prepared for non-targeted metabolomic analysis using liquid chromatography coupled to high-resolution mass spectrometry.</p><p><strong>Results: </strong>The LCHF diet had a considerable impact on plasma lipids, whereas the respective effects in the LOW-GI and HIGH-GI groups were less pronounced. Specifically, 179 up- or down-regulated metabolites were identified in the LCHF group, 111 in the LOW-GI group, and 139 in the HIGH-GI group. Phospholipids and sphingolipids were found to be the most prominent metabolites in the samples. Furthermore, the regulation of glycerolipids, carnitine, amino acids, and carbon acids exhibited differential patterns across the groups.</p><p><strong>Discussion: </strong>There is evidence to suggest that the LCHF diet enhances fat metabolism, as indicated by increased levels of carnitine and ketone bodies, as well as a downregulation of amino acids. Conversely, the presence of specific carbon acids might diminish carbohydrate metabolism and impair endurance performance. In contrast, the LOW-GI group may have demonstrated augmented metabolic flexibility due to the upregulations of both carnitines and carbon acids in the samples. The elevated glycerolipids content in the HIGH-GI group suggests a potential reduction in fatty acid oxidation due to hyperinsulinemia.</p>","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"22 1","pages":"2536139"},"PeriodicalIF":3.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12288182/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144690643","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":"International society of sports nutrition position stand: β-hydroxy-β-methylbutyrate (HMB).","authors":"John A Rathmacher, Lisa M Pitchford, Jeffrey R Stout, Jeremy R Townsend, Ralf Jäger, Richard B Kreider, Bill I Campbell, Chad M Kerksick, Patrick S Harty, Darren G Candow, Brandon M Roberts, Shawn M Arent, Douglas S Kalman, Jose Antonio","doi":"10.1080/15502783.2024.2434734","DOIUrl":"10.1080/15502783.2024.2434734","url":null,"abstract":"&lt;p&gt;&lt;p&gt;Position Statement: The International Society of Sports Nutrition (ISSN) bases the following position stand on an analysis of the literature regarding the effects of β-Hydroxy-β-Methylbutyrate (HMB). The following 12 points have been approved by the Research Committee of the Society: 1. HMB is a metabolite of the amino acid leucine that is naturally produced in both humans and other animals. Two forms of HMB have been studied: Calcium HMB (HMB-Ca) and a free acid form of HMB (HMB-FA). HMB-FA appears to lead to increased appearance of HMB in the bloodstream when compared to HMB-Ca, though recent results are mixed. 2. The available safety/toxicity data suggest that chronic HMB-Ca and HMB-FA consumption are safe for oral HMB supplementation in humans up to at least one year. 3. There are no negative effects of HMB-Ca and HMB-FA on glucose tolerance and insulin sensitivity in humans. There may be improvements in glucose metabolism in younger adults. 4. The primary mode of action of HMB appears to be through its dual mechanism to enhance muscle protein synthesis and suppress muscle protein breakdown. HMB's activation of mTORC1 is independent of the leucine-sensing pathway (Sestrin2-GATOR2 complex). 5. HMB may help reduce muscle damage and promote muscle recovery, which can promote muscle growth/repair. HMB may also have anti-inflammatory effects, which could contribute to reducing muscle damage and soreness. 6. HMB consumption in close proximity to an exercise bout may be beneficial to increase muscle protein synthesis and attenuate the inflammatory response. HMB can provide a beneficial physiological effect when consumed both acutely and chronically in humans. 7. Daily HMB supplementation (38 mg/kg body weight) in combination with exercise training may improve body composition through increasing lean mass and/or decreasing fat mass with benefits in participants across age, sex, and training status. The most pronounced of these improvements in body composition with HMB have been observed in studies with robust resistance training programs and dietary control. 8. HMB may improve strength and power in untrained individuals, but its performance benefits in trained athletes are mixed and increase with an increase in study duration (&gt;6 weeks). HMB's beneficial effects on athletic performance are thought to be driven by improved recovery. 9. HMB supplementation appears to potentially have a positive impact on aerobic performance, especially in trained athletes. The mechanisms of the effects are unknown. 10. HMB supplementation may be important in a non-exercising sedentary and aging population to improve muscle strength, functionality, and muscle quality. The effects of HMB supplementation with exercise are varied, but the combination may have a beneficial effect on the treatment of age-associated sarcopenia under select conditions. 11. HMB may be effective in countering muscle disuse atrophy during periods of inactivity due to illness or injury. The ","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"22 1","pages":"2434734"},"PeriodicalIF":4.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11740297/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142854635","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":"Efficacy of time restricted eating and resistance training on body composition and mood profiles among young adults with overweight/obesity: a randomized controlled trial.","authors":"Tingting Cui, Yichao Sun, Weibing Ye, Yubo Liu, Mallikarjuna Korivi","doi":"10.1080/15502783.2025.2481127","DOIUrl":"10.1080/15502783.2025.2481127","url":null,"abstract":"<p><strong>Background/objective: </strong>Dietary restriction or exercise regimens can promote weight loss or physical fitness among patients with obesity. However, intervention-associated adverse effects may impede patients' motivation to participate in dietary/exercise interventions. We examined the effects of time restricted eating (TRE) with or without resistance training (RT) on body composition, mood profile, and sleep quality in young college adults with overweight or obesity.</p><p><strong>Methods: </strong>Fifty-four young college students with overweight/obesity were randomized into control (CON), TRE, RT, and TRE plus RT (TRE+RT) trials. The TRE trials restricted to an eating window of 10-hour/day for 8-week. The RT trials performed supervised resistance exercise, while the control trial maintained a regular lifestyle. Changes in body composition variables, blood pressure, mood status, and sleep quality were measured before and after the intervention.</p><p><strong>Results: </strong>TRE intervention alone or in combination with RT significantly (<i>p</i> < 0.01) decreased body weight (>2 kg) and BMI (~1 kg/m²) in adults with overweight/obesity. Both RT alone and combined with TRE substantially decreased fat mass by 1.1 ± 0.5 and 3.2 ± 0.4 kg, respectively. The decreased fat mass was greater in the combination trial than in the RT trial, whereas TRE alone had no effect. In contrast, fat-free mass was significantly (<i>p</i> < 0.01) decreased with TRE (-2.3 ± 06 kg), increased with RT (1.6 ± 0.3 kg), and was stably maintained with combination interventions. The reduced waist and hip circumferences in the TRE (<i>p</i> < 0.01) were similar to those in the TRE+RT trials, however, RT alone had no effect. Time and group interaction showed a large effect size (partial eta squared) for all body composition variables. In addition, RT with or without TRE notably decreased diastolic blood pressure (RT: -5.5 ± 1.9 mmHg, TRE+RT: -4.1 ± 1.5 mmHg, <i>p</i> < 0.05). Mild anxiety levels at baseline in RT (4.8 ± 2.6) and TRE+RT (4.1 ± 3) trials were found to be normal at postintervention in TRE+RT (3.6 ± 1.7) but not in RT (5.6 ± 3.5). No depression or stress was recorded among the participants during the intervention. The reported poor sleep quality among participants at baseline was significantly improved with RT (4.8 ± 2.9; <i>p</i> < 0.05), and tended to improve with TRE+RT interventions (4.5 ± 1.9).</p><p><strong>Conclusions: </strong>10-hour TRE is beneficial for weight/fat loss without affecting mood status. However, TRE combined with RT might be more effective for weight/fat loss, maintaining muscle mass, and good quality of sleep among young adults with overweight or obesity.</p>","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"22 1","pages":"2481127"},"PeriodicalIF":4.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11926902/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143663708","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":"How reliable is the labeling of a commercial phytosteroid product? A 12-week randomized double-blind training study.","authors":"Joshua Dissemond, Tim Havers, Steffen Held, Stephan Geisler, Tihomir Kostov, Patrick Diel, Svea Türschmann, Maria K Parr, Eduard Isenmann","doi":"10.1080/15502783.2025.2540408","DOIUrl":"10.1080/15502783.2025.2540408","url":null,"abstract":"&lt;p&gt;&lt;strong&gt;Introduction: &lt;/strong&gt;Phytosteroids like 20-hydroxyecdysone (20E) and diosgenin (DSG) have shown promising anabolic and performance-enhancing effects in in vitro, animal, and human studies. Combining phytosteroids is common in supplements, with early in vitro research suggesting additive effects via distinct signaling pathways. However, human studies on the combined effects of 20E and DSG are lacking. This study aimed to evaluate the anabolic and performance-enhancing potential of a commercially available 20E and DSG supplement.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Methods: &lt;/strong&gt;Twenty-eight resistance-trained young men were recruited for this study. Participants were randomized into two groups: a 20E and DSG (EcDi) group, and a placebo (Plac) group. Both groups performed free-weight resistance training three times per week for 12 weeks. The EcDi group received a commercially available phytosteroid product three times a day (as recommended on the label), while the Plac group received a placebo product. Assessments were conducted at four time points (T0, T1 [4 weeks], T2 [8 weeks], T3 [12 weeks]) and included measurements of one-repetition maximum (1-RM) for the squat (SQ) and bench press (BP) exercises, as well as body weight (BW), fat-free mass (FFM), muscle mass (MM), fat mass (FM), and muscle thickness of the pectoralis major (PM) and the proximal, middle and distal regions of the anterior (i.e. &lt;i&gt;M. rectus femoris&lt;/i&gt; and &lt;i&gt;M. vastus intermedius&lt;/i&gt;) and lateral quadriceps femoris (i.e. &lt;i&gt;M. vastus lateralis&lt;/i&gt; and &lt;i&gt;M. vastus intermedius&lt;/i&gt;). Liver and kidney function, along with endocrine parameters, were measured via blood samples pre- and post-intervention. Additionally, the concentration of 20E and DSG in the product was measured by LC-MS/MS, and its biological activity was evaluated using C2C12 cells after the intervention. Data were analyzed using a linear mixed model (LMM).&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Results: &lt;/strong&gt;Twenty-four participants completed the study successfully. Significant improvements in 1-RM SQ and BP were observed across both groups, indicating a time but no specific group effect. Similarly, significant time effects without group effects were found for FFM, MM, FM and muscle thickness (anterior quadriceps femoris at 30%, lateral quadriceps femoris at 50% and PM). Subsequent analyses of the supplement revealed that less than 1% of the claimed 20E concentration and 10.4% of the claimed DSG concentration were present in the capsules. In addition, no biological activity or hypertrophic effects were detected in the C2C12 cells.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Conclusion: &lt;/strong&gt;This study demonstrated that the prescribed resistance training protocol resulted in significant anabolic and performance-enhancing effects that did not differ between groups. The lack of group-specific differences suggests that the tested phytosteroid supplement did not provide additional benefits. The significant discrepancy between the claimed and actual 20E and DSG concentr","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"22 1","pages":"2540408"},"PeriodicalIF":3.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12337734/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144804313","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 mental fatigue and caffeine on basketball performance: insights from a crossover study.","authors":"Mehdi Hemmat, Gholamhosein Nazemzadegan, Alireza Niknam, Farhad Daryanoosh, Maryam Koushkie Jahromi","doi":"10.1080/15502783.2025.2541010","DOIUrl":"10.1080/15502783.2025.2541010","url":null,"abstract":"<p><strong>Background: </strong>The interactive effect of mental fatigue and caffeine consumption on sport performance is not clear. This study aimed to investigate the impact of mental fatigue and caffeine gum consumption on power and skill performance in recreationally trained male basketball players.</p><p><strong>Methods: </strong>A randomized, double-blind, crossover design was used, with twenty male participants (age: 16.7 ± 0.86 years, body mass: 79.6 ± 8.2 kg, height: 183.2 ± 8.6 cm, training experience ≥ 3 years). Participants completed four testing sessions under the following conditions: (1) no mental fatigue with placebo gum, (2) mental fatigue with placebo gum, (3) no mental fatigue with caffeine gum, and (4) mental fatigue with caffeine gum. The sessions were separated by one week. Mental fatigue was induced through a 30-minute Stroop task, and caffeine gum (50 mg of caffeine per piece) was administered 15 minutes before performance testing. Power and skill performance were assessed via vertical jump height, V-CUT dribbling test, medicine ball throw, and stationary two-point shooting, with three attempts per test.</p><p><strong>Results: </strong>Mental fatigue significantly increased time to react for congruent name and color (Z = 3.9, <i>p</i> < 0.001) and incongruent name and color (Z = 3.9, <i>p</i> < 0.001), as well as perceived fatigue (Z = 3.9, <i>p</i> < 0.001) after the Stroop task. Performance analysis revealed a significant main effect of condition on vertical jump height (F = 2.9, <i>p</i> = 0.04) and V-CUT dribbling performance (F = 4.4, <i>p</i> = 0.007), but not on medicine ball throw, change of direction test, or stationary two-point shooting (<i>p</i> > 0.05). Mental fatigue (mental fatigue with placebo gum) significantly impaired vertical jump height (<i>p</i> = 0.008) and V-CUT dribbling performance (<i>p</i> = 0.049) compared to the no mental fatigue with placebo gum condition. No significant differences were found between other condition pairs for these performance measures.</p><p><strong>Conclusion: </strong>Mental fatigue negatively affects power and skill performance in basketball players, while caffeine gum consumption may offer a potential strategy to mitigate these effects. While caffeine gum attenuated some performance declines in the mental fatigue with caffeine gum condition compared to mental fatigue with placebo gum, these differences were not statistically significant. Future research should explore optimal caffeine doses and additional performance variables.</p>","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"22 1","pages":"2541010"},"PeriodicalIF":3.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12308885/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144731968","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":"Comparison of athlete diet index and body composition between professional and non-professional athletes: a comparative cross-sectional study.","authors":"Elaheh Dehghani, Zahra Gohari Dezfuli, Sakineh Shab Bidar, Fereshteh Torki, Tohid Seif Barghi, Kurosh Djafarian","doi":"10.1080/15502783.2025.2533497","DOIUrl":"10.1080/15502783.2025.2533497","url":null,"abstract":"<p><strong>Background: </strong>This study aimed to compare the Athlete Diet Index (ADI) and body composition between professional and nonprofessional athletes to better understand how differences in training and nutrition impact athletic performance and health.</p><p><strong>Method: </strong>A comparative cross-sectional design was used to analyze 183 athletes (99 professional, 84 nonprofessional) from various sports disciplines in Tehran. Data were collected on body composition parameters, including fat mass (FM) and fat free mass (FM) using bioelectrical impedance analysis (BIA) and the ADI, a validated tool for assessing diet quality.</p><p><strong>Results: </strong>The results revealed that professional athletes had significantly lower FM percentages (16.2% ± 7.1%) and higher FFM percentages (80.8% ± 6.8%) compared to their nonprofessional counterparts (FM 18.8% ± 9.9%, FFM 78.0% ± 9.6%). Additionally, professional athletes exhibited higher ADI scores, indicating better adherence to sports nutrition guidelines.</p><p><strong>Conclusions: </strong>These findings highlight the benefits of structured training and personalized nutrition in achieving favorable body composition. This study underscores the importance of personalized nutrition strategies for optimizing athletic health and performance, particularly for nonprofessional athletes who may not have access to professional dietary guidance. Further research is needed to explore the long-term effects of dietary and training interventions on body composition and athletic performance across various athlete populations.</p>","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"22 1","pages":"2533497"},"PeriodicalIF":4.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12261505/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144626654","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":"Neither pre-sleep nor post-exercise protein consumption influences resistance exercise training adaptations in older adults.","authors":"Alex O Klemp, Michael J Ormsbee, Mingchia Yeh, Chester M Sokolowski, Do-Houn Kim, Lynn B Panton, Jeong-Su Kim","doi":"10.1080/15502783.2025.2519511","DOIUrl":"10.1080/15502783.2025.2519511","url":null,"abstract":"<p><strong>Purpose: </strong>Limited data exists that compare pre-sleep versus post-exercise protein intake during resistance exercise training (RET) in older adults. This study examined whether 40 g of protein consumed post-exercise (PRP) or pre-sleep (PSP) enhances muscle thickness (MT) and strength compared to RET alone (RETO) in older men.</p><p><strong>Methods: </strong>Thirty untrained older men (65.7 ± 4.0 yrs) completed 12 weeks of supervised RET (2×/week) and were randomized to PRP (<i>n</i> = 9), PSP (<i>n</i> = 11), or RETO (<i>n</i> = 10). MT of the vastus lateralis (VL), rectus femoris (RF), and vastus intermedius (VI) and 1-repetition maximum (1-RM) for leg and chest press were assessed at weeks 0, 6, and 12.</p><p><strong>Results: </strong>VL (0 to 12 weeks: + 0.16 cm, 95% C.I. [0.06, 0.25]), RF (0 to 12 weeks: + 0.13 cm, 95% C.I. [0.03, 0.23]), and VI MT (0 to 12 weeks: + 0.18 cm, 95% C.I. [0.05, 0.31]) and chest press (0 to 12 weeks: + 10.9 kg, 95% C.I. [5.50, 16.3]) and leg press (0 to 12 weeks: + 28.3 kg, 95% C.I. [19.63, 37.1]) 1-RM increased (<i>p</i> < 0.050) with no group differences.</p><p><strong>Conclusion: </strong>Consuming 40 g of protein post-exercise or pre-sleep did not enhance RET-induced improvements in muscle thickness or strength in older adults with adequate baseline protein intake (≥1.0 g/kg/day). RET alone elicited significant gains, emphasizing that adherence to training and meeting daily protein requirements are more critical than timing strategies for untrained older adults. ClinicalTrials.gov identifier: NCT05922475, 06/23/2023, retrospectively registered.</p>","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"22 1","pages":"2519511"},"PeriodicalIF":4.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144333411","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":"Neuromuscular adaptations to caffeine supplementation in low-load resistance training with blood flow restriction.","authors":"Yen-Ting Lin, Ching-Lin Wu, Chia-Chan Wu, Chia-Ling Hu, Yi-Ching Chen, Ing-Shiou Hwang","doi":"10.1080/15502783.2025.2561676","DOIUrl":"10.1080/15502783.2025.2561676","url":null,"abstract":"<p><strong>Background: </strong>Although blood flow restriction (BFR) resistance training effectively enhances muscle strength, it increases fatigue susceptibility due to hypoxic stress. This study investigated whether combining caffeine - a common ergogenic aid - with BFR could provide additional training benefits.</p><p><strong>Methods: </strong>Twenty-eight young adults completed a 4-week low-load resistance training program for wrist extensors, divided into two groups: BFR (<i>n</i> = 14) and BFR with caffeine (BFRC, <i>n</i> = 14). Both groups performed the same occluded training at 20% of maximal voluntary contraction (MVC), with the BFRC group consuming 6 mg·kg^{- 1} caffeine one hour prior. Pre- and posttests assessed MVC and force control during a task involving gradual force increase and release.</p><p><strong>Results: </strong>The results demonstrated comparable training-related increases in MVC and precision of control of force in both groups (<i>p</i> > .05). However, only the BFRC group exhibited a significant training-related decline in the size of force fluctuations (<i>p</i> = .002) with enhanced complexity during force release (<i>p</i> = .036). Consistent with the characteristic changes in force fluctuations, the BFRC group exhibited smaller variability (<i>p</i> = .002) and a higher mean frequency (<i>p</i> = .023) of pooled motor unit discharges during force release.</p><p><strong>Conclusions: </strong>While caffeine does not significantly enhance strength gains after four weeks of isometric BFR training in untrained individuals, it improves force release precision by globally reducing motor unit discharge variability.</p>","PeriodicalId":17400,"journal":{"name":"Journal of the International Society of Sports Nutrition","volume":"22 1","pages":"2561676"},"PeriodicalIF":3.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12444970/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145069809","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}