Abstract：
:In a randomised, double-blind, placebo-controlled crossover design, 10 females taking monophasic oral contraceptives completed 90 min intermittent treadmill-running 45 min after ingestion of 6 mg∙kg(-1) body mass anhydrous caffeine or artificial sweetener (placebo). Water (3 mL∙kg(-1)) was provided every 15 min during exercise. Venous blood samples were taken before, during and after exercise, as well as after sleep (~15 h post-ingestion), and levels of caffeine, paraxanthine, theobromine and theophylline were measured using high-performance liquid chromatography. Sleep quality was assessed using the Leeds Sleep Evaluation Questionnaire. Plasma caffeine concentration peaked 100 min after ingestion. Caffeine clearance was 0.95±0.14 mL·min(-1)·kg(-1) while the elimination half-life of caffeine was 17.63±8.06 h. Paraxanthine and theophylline levels were significantly elevated at 15 h with no significant change in theobromine. Sleep latency and subsequent quality of sleep was impaired following caffeine supplementation (P<0.05); there were no differences between trials for how participants were feeling upon awakening. This is the first controlled study to examine caffeine supplementation on sleep quality in female athletes taking a low-dose monophasic oral contraceptive steroid following an intermittent-exercise running protocol. The data shows that female athletes using monophasic oral contraceptive steroids will have impaired sleep quality following evening caffeine ingestion.
journal_name
Int J Sports Medjournal_title
International journal of sports medicineauthors
Ali A,O'Donnell JM,Starck C,Rutherfurd-Markwick KJdoi
10.1055/s-0034-1398580subject
Has Abstractpub_date
2015-06-01 00:00:00pages
433-9issue
6eissn
0172-4622issn
1439-3964journal_volume
36pub_type
杂志文章,随机对照试验abstract：:The aims of the study were to investigate the presence of a relative age effect and the influence of birth quarter on anthropometric characteristics, an estimation of biological maturity and performance in the Yo-Yo Intermittent Recovery Test level 1 in 606 elite, Flemish youth soccer players. The sample was divided i...
journal_title：International journal of sports medicine
pub_type： 杂志文章
doi：10.1055/s-0032-1311654
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journal_title：International journal of sports medicine
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journal_title：International journal of sports medicine
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journal_title：International journal of sports medicine
pub_type： 杂志文章,meta分析
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journal_title：International journal of sports medicine
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journal_title：International journal of sports medicine
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journal_title：International journal of sports medicine
pub_type： 临床试验,杂志文章
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journal_title：International journal of sports medicine
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journal_title：International journal of sports medicine
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journal_title：International journal of sports medicine
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journal_title：International journal of sports medicine
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doi：10.1055/s-2005-837468
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journal_title：International journal of sports medicine
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更新日期：1996-02-01 00:00:00
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journal_title：International journal of sports medicine
pub_type： 杂志文章,评审
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journal_title：International journal of sports medicine
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journal_title：International journal of sports medicine
pub_type： 临床试验,杂志文章
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