Journal of exercise and nutrition最新文献_第5页

Dietary Supplement Usage, Associated Knowledge and Attitudes of Sri Lankan National-Level Athletes: A Cross Sectional Study 斯里兰卡国家级运动员膳食补充剂的使用、相关知识和态度:一项横断面研究

Journal of exercise and nutrition Pub Date : 2021-07-13 DOI: 10.53520/2021.10398

S. A. N. Rashani, S. Pigera, P. Fernando, M. Niriella, S. Jayawickreme, A. P. Silva

{"title":"Dietary Supplement Usage, Associated Knowledge and Attitudes of Sri Lankan National-Level Athletes: A Cross Sectional Study","authors":"S. A. N. Rashani, S. Pigera, P. Fernando, M. Niriella, S. Jayawickreme, A. P. Silva","doi":"10.53520/2021.10398","DOIUrl":"https://doi.org/10.53520/2021.10398","url":null,"abstract":"Purpose: This study aimed to identify dietary supplement prevalence, reasons to use, supplement types, personal beliefs, knowledge and practices of athletes related to supplement use and doping in sports.\u0000\u0000Methods: Data was collected from 386 athletes (Male; 66.8%, Female; 33.2%, Mean age ±SD; 26.22±4.9), represented national pools of 12 sport types.\u0000\u0000Results: 354 (91.5%) of athletes used supplements including multivitamin (57%), electrolyte (49.7%), protein (43.5%), calcium (19.7%) and creatine (17.4%). Gender, social status, education and profession were not found to be determinants of supplement use, but sport type did (p < 0.05). Rugby and weightlifting players showed significant protein, multivitamin and creatine use per day (p < 0.05). Many athletes consumed supplements to boost their performance (41.8%) and strength (54. 5%). The majority (60.5%) claimed about self-decided supplementation plan. Male athletes had more dope-positive attitudes than females (P<0.05). Athletes who attended anti-doping educational workshops/were exposed to international competitions were more concerned about supplement content (p <0.05). A considerable number of multivitamin (51.8%), creatine (37.3%) and protein (14.8%) users consumed them without any scientific basis.\u0000\u0000Conclusions: Dietary supplements appear to be widely consumed by Sri Lankan national-level athletes, whereas a considerable proportion does not follow proper nutritional assessment before use.","PeriodicalId":73743,"journal":{"name":"Journal of exercise and nutrition","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43262293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An Accelerometer-Based Training Load Analysis to Assess Volleyball Performance 基于加速度计的训练负荷分析法评估排球运动成绩

Journal of exercise and nutrition Pub Date : 2021-07-09 DOI: 10.53520/jen2018.1034

Gabriel J. Sanders, Brian Boos, Frank Shipley, Cory M. Scheadler, Corey A. Peacock

{"title":"An Accelerometer-Based Training Load Analysis to Assess Volleyball Performance","authors":"Gabriel J. Sanders, Brian Boos, Frank Shipley, Cory M. Scheadler, Corey A. Peacock","doi":"10.53520/jen2018.1034","DOIUrl":"https://doi.org/10.53520/jen2018.1034","url":null,"abstract":"\u0000 \u0000 \u0000Introduction: The purpose was to quantify a volleyball athlete’ s accelerometer-based workloads and utilize a neuromuscular fatigue jump test to assess on-court performance throughout a competitive season. \u0000Methods: One, Division I volleyball athlete was monitored throughout each practice and competitive game using a validated wearable microsensor device (Catapult Sports). To assess neuromuscular fatigue, an approach jump (AJ) test was completed weekly. On-court statistics were recorded each game. \u0000Results: Utilizing a forward linear regression model, low intensity decelerations, moderate and high intensity accelerations, and low and high intensity jumps accounted for 91.7% of the variation in weekly relative power assessed via AJ test (p < 0.001). Of those variables, only high intensity jumps were significantly (p = 0.035) different between practices that occurred prior to winning (49.6 ± 26.7) and losing (69.2 ± 39.8) game performances. Additionally, hitting percent was significantly better (.266 ± .190 win; .130 ± .129 loss; p = 0.05) in winning performances. \u0000Conclusions: Alterations in approach jump performance throughout a competitive season is multifaceted; however, limiting high intensity jumps in practice may be advantageous to optimize volleyball performance. \u0000 \u0000 \u0000","PeriodicalId":73743,"journal":{"name":"Journal of exercise and nutrition","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45688868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Differences in Energy Expenditure and Typing Speed While Sitting, Standing, and Walking in College Students 大学生坐、站、走时能量消耗和打字速度的差异

Journal of exercise and nutrition Pub Date : 2021-01-01 DOI: 10.53520/jen2021.103107

F. Miller, Avniel Barrow, A. Perez, Yenly Londono Calle

{"title":"Differences in Energy Expenditure and Typing Speed While Sitting, Standing, and Walking in College Students","authors":"F. Miller, Avniel Barrow, A. Perez, Yenly Londono Calle","doi":"10.53520/jen2021.103107","DOIUrl":"https://doi.org/10.53520/jen2021.103107","url":null,"abstract":"Introduction: The purpose of this study was to determine if caloric expenditure and typing speed differed among three positions (sitting, standing, walking). Methods: Participants included 40 college students (18-22 years, 30 males and 10 females) on either the baseball or track and field teams. Each participant was tested for 5 minutes in three different positions. Caloric expenditure was measured via indirect calorimetry and typing productivity via a 3-minute typing test. Repeated measures ANOVAs and T-Tests were performed to determine statistical differences for caloric expenditure and typing speed. Results: Caloric expenditure (calories per 5 minutes) was significantly higher for walking (16.4 ± 3.1) than for sitting (9.0 ± 2.4, p <0.0001) and standing (9.4 ± 2.0, p <0.0001). For typing productivity, standing resulted in faster typing speed than walking (37.4 ± 10.2 vs. 34.7 ± 10.7 wpm, p = 0096). Conclusions: Using a standup walking desk to type while working expends significantly more calories than typing while sitting or standing at a desk. However, typing speed was significantly higher while standing at a desk than while walking at a desk.","PeriodicalId":73743,"journal":{"name":"Journal of exercise and nutrition","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71088277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Highly Branched Cyclic Dextrin and its Ergogenic Effects in Athletes: A Brief Review 高支环糊精及其在运动员体内的促角作用:综述

Journal of exercise and nutrition Pub Date : 2021-01-01 DOI: 10.53520/jen2021.103100

Dylan T. Wilburn, Steven B. Machek, Ahmed Ismaeel

引用次数: 1

Effects of 5-Day Heat Acclimation on Workers Wearing Personal Protective Clothing. 5天热驯化对穿着个人防护服工人的影响。

Journal of exercise and nutrition Pub Date : 2018-01-01

Yongsuk Seo, Tyler D Quinn, Jung-Hyun Kim, Jeffrey B Powell, Raymond J Roberge, Aitor Coca

{"title":"Effects of 5-Day Heat Acclimation on Workers Wearing Personal Protective Clothing.","authors":"Yongsuk Seo, Tyler D Quinn, Jung-Hyun Kim, Jeffrey B Powell, Raymond J Roberge, Aitor Coca","doi":"","DOIUrl":"","url":null,"abstract":"Introduction: Elevated ambient temperature and personal protective clothing (PPC) induce physiological strain which may be counteracted by heat acclimation. The purpose of this study was to determine if 5-day heat acclimation training (HAT) improves thermal and perceptual responses while wearing chemical, biological, radiological, and nuclear (CBRN) PPC.Methods: Nine healthy men completed a heat stress test (walking for one hour with CBRN PPC) in 35°C and 50% relative humidity (RH) before and after 5-day HAT. The HAT consisted of five consecutive days of two 45-minute cycling sessions (50% VO2max) wearing athletic clothing separated by a 15 min rest in 45°C and 20% RH. Results of the pre- and post-HAT heat stress tests were compared.Results: Heat acclimation was seen through 5-day HAT; however, thermoregulatory responses did not improve while wearing CBRN PPC. Improvement (p<0.05, day 1 vs. day 5 HAT) in skin temperature (38.0±0.5°C vs. 37.6±0.5°C), body temperature (38.6±0.4°C vs. 38.3±0.4°C), sweat rate (2.26±0.3kg vs. 2.64±0.3kg), RPE (15.8±2.4 vs. 13.9±3.1), and heat perception (5.7±0.6 vs. 4.9±1.0) were noted. However, no physiological or perceptual improvements (p>0.05) were found in the post-HAT heat stress test.Conclusions: Heat acclimation adaptations may be blunted by CBRN PPC, thus requiring differing or extended HAT.","PeriodicalId":73743,"journal":{"name":"Journal of exercise and nutrition","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10194072/pdf/nihms-1877618.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9574088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0