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15 papers 0 to 25 followers
https://read.qxmd.com/read/28202713/vitamin-d-supplementation-to-prevent-acute-respiratory-tract-infections-systematic-review-and-meta-analysis-of-individual-participant-data
#1
REVIEW
Adrian R Martineau, David A Jolliffe, Richard L Hooper, Lauren Greenberg, John F Aloia, Peter Bergman, Gal Dubnov-Raz, Susanna Esposito, Davaasambuu Ganmaa, Adit A Ginde, Emma C Goodall, Cameron C Grant, Christopher J Griffiths, Wim Janssens, Ilkka Laaksi, Semira Manaseki-Holland, David Mauger, David R Murdoch, Rachel Neale, Judy R Rees, Steve Simpson, Iwona Stelmach, Geeta Trilok Kumar, Mitsuyoshi Urashima, Carlos A Camargo
Objectives  To assess the overall effect of vitamin D supplementation on risk of acute respiratory tract infection, and to identify factors modifying this effect. Design  Systematic review and meta-analysis of individual participant data (IPD) from randomised controlled trials. Data sources  Medline, Embase, the Cochrane Central Register of Controlled Trials, Web of Science, ClinicalTrials.gov, and the International Standard Randomised Controlled Trials Number registry from inception to December 2015. Eligibility criteria for study selection  Randomised, double blind, placebo controlled trials of supplementation with vitamin D3 or vitamin D2 of any duration were eligible for inclusion if they had been approved by a research ethics committee and if data on incidence of acute respiratory tract infection were collected prospectively and prespecified as an efficacy outcome...
February 15, 2017: BMJ: British Medical Journal
https://read.qxmd.com/read/25050610/vitamin-d-supplementation-and-upper-respiratory-tract-infections-in-adolescent-swimmers-a-randomized-controlled-trial
#2
RANDOMIZED CONTROLLED TRIAL
Gal Dubnov-Raz, Barak Rinat, Harri Hemilä, Lauryn Choleva, Avner H Cohen, Naama W Constantini
Observational studies identified associations between vitamin D insufficiency (serum 25(OH)D < 30ng·ml-1) and risk of upper respiratory infection (URI). Swimmers are highly prone to URIs, which might hinder their performance. The aim of this study was to examine if vitamin D3 supplementation reduces URI burden in vitamin D-insufficient swimmers. Fifty-five competitive adolescent swimmers with vitamin D insufficiency were randomized to receive vitamin D3 (2,000IU·d-1) or placebo for 12 winter weeks. A URI symptom questionnaire was completed weekly...
February 2015: Pediatric Exercise Science
https://read.qxmd.com/read/23600891/effects-of-dietary-antioxidants-on-training-and-performance-in-female-runners
#3
Andrea J Braakhuis, Will G Hopkins, Tim E Lowe
Exercise-induced oxidative stress is implicated in muscle damage and fatigue which has led athletes to embark on antioxidant supplementation regimes to negate these effects. This study investigated the intake of vitamin C (VC) (1 g), blackcurrant (BC) juice (15 mg VC, 300 mg anthocyanins) and placebo in isocaloric drink form on training progression, incremental running test and 5-km time-trial performance. Twenty-three trained female runners (age, 31 ± 8 y; mean ± SD) completed three blocks of high-intensity training for 3 wks and 3 days, separated by a washout (~3...
2014: European Journal of Sport Science
https://read.qxmd.com/read/8185726/vitamin-c-supplementation-reduces-the-incidence-of-postrace-symptoms-of-upper-respiratory-tract-infection-in-ultramarathon-runners
#4
RANDOMIZED CONTROLLED TRIAL
E M Peters, J M Goetzsche, B Grobbelaar, T D Noakes
This study determined whether daily supplementation with 600 mg vitamin C would reduce the incidence of symptoms of upper-respiratory-tract (URT) infections after participation in a competitive ultramarathon race (> 42 km). Ultramarathon runners with age-matched controls were randomly divided into placebo and experimental (vitamin C-supplemented) groups. Symptoms of URT infections were monitored for 14 d after the race. Sixty-eight percent of the runners in the placebo group reported the development of symptoms of URT infection after the race; this was significantly more (P < 0...
February 1993: American Journal of Clinical Nutrition
https://read.qxmd.com/read/9139752/vitamin-c-neutrophil-function-and-upper-respiratory-tract-infection-risk-in-distance-runners-the-missing-link
#5
REVIEW
E M Peters-Futre
Moderate submaximal exercise results in neutrophilia and enhanced phagocytic and oxidative capacity of neutrophils. It has been hypothesized, however, that during intensive exercise and periods of intensive training this pro-oxidative effect becomes suppressive. Vitamin C is widely recognized for its antioxidant function in extracellular fluid, and it has been shown to neutralize O2-, HOCl, and .OH and to attenuate the suppression of phagocytic function. Clinical manifestation of reduced neutrophil function following participation in ultramarathon races has, however, not been observed...
1997: Exercise Immunology Review
https://read.qxmd.com/read/18769906/molecular-detection-of-exercise-induced-free-radicals-following-ascorbate-prophylaxis-in-type-1-diabetes-mellitus-a-randomised-controlled-trial
#6
RANDOMIZED CONTROLLED TRIAL
G W Davison, T Ashton, L George, I S Young, J McEneny, B Davies, S K Jackson, J R Peters, D M Bailey
AIMS/HYPOTHESIS: Patients with type 1 diabetes mellitus are more susceptible than healthy individuals to exercise-induced oxidative stress and vascular endothelial dysfunction, which has important implications for the progression of disease. Thus, in the present study, we designed a randomised double-blind, placebo-controlled trial to test the original hypothesis that oral prophylaxis with vitamin C attenuates rest and exercise-induced free radical-mediated lipid peroxidation in type 1 diabetes mellitus...
November 2008: Diabetologia
https://read.qxmd.com/read/20517894/oral-vitamin-c-and-e-combination-modulates-blood-lipid-peroxidation-and-antioxidant-vitamin-levels-in-maximal-exercising-basketball-players
#7
Mustafa Naziroğlu, Fatih Kilinç, Abdulhadi Cihangir Uğuz, Omer Celik, Ramazan Bal, Peter J Butterworth, Metin Lütfi Baydar
Oxidative stress occurs during maximal exercise, perhaps as a result of increased consumption of oxygen. Vitamins C and E can overcome the effects of antioxidants in exercise. We investigated the effects of supplementation with a combination of vitamin C and E (VCE) on blood lipid peroxidation (LP) and antioxidant levels following maximal training in basketball players.Blood samples were taken from 14 players (group A) and divided into two subgroups namely maximal training (group B) and maximal training plus VCE groups (group C)...
June 2010: Cell Biochemistry and Function
https://read.qxmd.com/read/12806217/nutritional-aspects-in-ultra-endurance-exercise
#8
REVIEW
Edith M Peters
PURPOSE OF REVIEW: Despite much current debate regarding central and peripheral neural mechanisms which may be responsible for the onset of fatigue during prolonged exercise, maintenance of nutritional and hydration status remains critical for successful participation in ultra-endurance exercise. This review focuses on substrate and fluid homeostasis during ultra-endurance exercise and the use of nutritional supplementation both as ergogenic aid and to attenuate exercise-induced immunosuppression...
July 2003: Current Opinion in Clinical Nutrition and Metabolic Care
https://read.qxmd.com/read/11590482/vitamin-c-supplementation-attenuates-the-increases-in-circulating-cortisol-adrenaline-and-anti-inflammatory-polypeptides-following-ultramarathon-running
#9
E M Peters, R Anderson, D C Nieman, H Fickl, V Jogessar
The effects of vitamin C supplementation on the alterations in the circulating concentrations of cortisol, adrenaline, interleukin-10 (IL-10) and interleukin-1 receptor antagonist (IL-1Ra) which accompany ultramarathon running were measured using immuno-chemiluminescence, radioimmunoassay and ELISA procedures. Forty-five participants in the 1999 Comrades 90 km marathon were divided into equal groups (n = 15) receiving 500 mg/day Vit C (VC-500), 1500 mg/day Vit C (VC-1500) or placebo (P) for 7 days before the race, on the day of the race, and for 2 days following completion...
October 2001: International Journal of Sports Medicine
https://read.qxmd.com/read/11960947/influence-of-vitamin-c-supplementation-on-oxidative-and-immune-changes-after-an-ultramarathon
#10
RANDOMIZED CONTROLLED TRIAL
David C Nieman, Dru A Henson, Steve R McAnulty, Lisa McAnulty, Nathaniel S Swick, Alan C Utter, Debra M Vinci, Shannon J Opiela, Jason D Morrow
The purpose of this randomized study was to measure the influence of vitamin C (n = 15 runners) compared with placebo (n = 13 runners) supplementation on oxidative and immune changes in runners competing in an ultramarathon race. During the 7-day period before the race and on race day, subjects ingested in randomized, double-blind fashion 1,500 mg/day vitamin C or placebo. On race day, blood samples were collected 1 h before race, after 32 km of running, and then again immediately after race. Subjects in both groups maintained an intensity of approximately 75% maximal heart rate throughout the ultramarathon race and ran a mean of 69 km (range: 48-80 km) in 9...
May 2002: Journal of Applied Physiology
https://read.qxmd.com/read/17636648/vitamin-c-for-preventing-and-treating-the-common-cold
#11
REVIEW
R M Douglas, H Hemilä, E Chalker, B Treacy
BACKGROUND: The role of vitamin C (ascorbic acid) in the prevention and treatment of the common cold has been a subject of controversy for 60 years, but is widely sold and used as both a preventive and therapeutic agent. OBJECTIVES: To discover whether oral doses of 0.2 g or more daily of vitamin C reduces the incidence, duration or severity of the common cold when used either as continuous prophylaxis or after the onset of symptoms. SEARCH STRATEGY: We searched the Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library Issue 4, 2006); MEDLINE (1966 to December 2006); and EMBASE (1990 to December 2006)...
July 18, 2007: Cochrane Database of Systematic Reviews
https://read.qxmd.com/read/31454046/effect-of-high-dose-vitamin-d-supplementation-on-volumetric-bone-density-and-bone-strength-a-randomized-clinical-trial
#12
RANDOMIZED CONTROLLED TRIAL
Lauren A Burt, Emma O Billington, Marianne S Rose, Duncan A Raymond, David A Hanley, Steven K Boyd
Importance: Few studies have assessed the effects of daily vitamin D doses at or above the tolerable upper intake level for 12 months or greater, yet 3% of US adults report vitamin D intakes of at least 4000 IU per day. Objective: To assess the dose-dependent effect of vitamin D supplementation on volumetric bone mineral density (BMD) and strength. Design, Setting, and Participants: Three-year, double-blind, randomized clinical trial conducted in a single center in Calgary, Canada, from August 2013 to December 2017, including 311 community-dwelling healthy adults without osteoporosis, aged 55 to 70 years, with baseline levels of 25-hydroxyvitamin D (25[OH]D) of 30 to 125 nmol/L...
August 27, 2019: JAMA: the Journal of the American Medical Association
https://read.qxmd.com/read/31406018/collider-bias-aka-sample-selection-bias-in-observational-studies-why-the-effects-of-hyperandrogenism-in-elite-women-s-sport-are-likely-underestimated
#13
Nicolai Topstad Borgen
No abstract text is available yet for this article.
August 12, 2019: British Journal of Sports Medicine
https://read.qxmd.com/read/31326919/glucocorticoids-in-elite-sport-current-status-controversies-and-innovative-management-strategies-a-narrative-review
#14
REVIEW
Alan Vernec, Andrew Slack, Peter Rex Harcourt, Richard Budgett, Martine Duclos, Audrey Kinahan, Katja Mjøsund, Christian J Strasburger
The use of systemic glucocorticoids (GCs), as well as local injections, continues to be a controversial issue in the sport/anti-doping community. There is widespread and legitimate use of GCs for numerous health conditions, yet there are concerns about side effects and the possibility of enhanced athletic performance in limited settings. This is compounded by the uncertainty regarding the prevalence of GC use, mechanisms underlying physiological effects and complex pharmacokinetics of different formulations...
July 20, 2019: British Journal of Sports Medicine
https://read.qxmd.com/read/29540367/ioc-consensus-statement-dietary-supplements-and-the-high-performance-athlete
#15
Ronald J Maughan, Louise M Burke, Jiri Dvorak, D Enette Larson-Meyer, Peter Peeling, Stuart M Phillips, Eric S Rawson, Neil P Walsh, Ina Garthe, Hans Geyer, Romain Meeusen, Lucas J C van Loon, Susan M Shirreffs, Lawrence L Spriet, Mark Stuart, Alan Vernec, Kevin Currell, Vidya M Ali, Richard Gm Budgett, Arne Ljungqvist, Margo Mountjoy, Yannis P Pitsiladis, Torbjørn Soligard, Uğur Erdener, Lars Engebretsen
Nutrition usually makes a small but potentially valuable contribution to successful performance in elite athletes, and dietary supplements can make a minor contribution to this nutrition programme. Nonetheless, supplement use is widespread at all levels of sport. Products described as supplements target different issues, including (1) the management of micronutrient deficiencies, (2) supply of convenient forms of energy and macronutrients, and (3) provision of direct benefits to performance or (4) indirect benefits such as supporting intense training regimens...
April 2018: British Journal of Sports Medicine
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