Abstract:
OBJECTIVE:To use the meta-analytical procedures to determine the magnitude of the effect of exercise-induced dehydration (EID) upon time-trial (TT) exercise performance. METHODS:Studies were located via database searches and cross-referencing. TT performance outcomes were converted to mean percentage changes in power output. Random-effects model meta-regressions, analogue to the ANOVA and weighted mean effect summaries were used to delineate the effect of the EID-associated body weight (BW) loss on TT performance. RESULTS:Five research articles, all using cycling TTs, were included, producing 13 effect estimates and representing 39 subjects. The mean ambient temperature, relative humidity, exercise intensity and duration of the exercise trials were 26.0 ± 6.7°C, 61 ± 9%, 68 ± 14% of VO(2max) and 86 ± 34 min, respectively. The effect of EID (mean BW loss of 2.20 ± 1.0%) during self-paced exercise conditions was to produce a non-significant increase in endurance performance of 0.06 ± 2.72% (p=0.94), compared with the maintenance of euhydration (mean BW loss of 0.44 ± 0.48%). Meta-regression analyses revealed a statistically significant relationship between the percentage changes in power output and exercise intensity and duration, but not with the EID-associated percentage changes in BW loss. Drinking according to the dictate of thirst was associated with an increase in TT performance compared with a rate of drinking below (+5.2 ± 4.6%, p=0.01) or above (+2.4 ± 5.0%, p=0.40) thirst. The probability that drinking to thirst confers a real and meaningful advantage on TT performances conducted under field conditions compared with a rate of drinking below and above thirst sensation is of the order of 98% and 62%, respectively. CONCLUSIONS:(1) Compared with euhydration, EID (up to 4% BW loss) does not alter cycling performances during out-of-door exercise conditions; (2) exercise intensity and duration have a much greater impact on cycling TT performances than EID and; (3) relying on thirst sensation to gauge the need for fluid replacement maximises cycling TT performances.
journal_name
Br J Sports Medjournal_title
British journal of sports medicineauthors
Goulet EDdoi
10.1136/bjsm.2010.077966subject
Has Abstractpub_date
2011-11-01 00:00:00pages
1149-56issue
14eissn
0306-3674issn
1473-0480pii
bjsm.2010.077966journal_volume
45pub_type
杂志文章,meta分析,评审abstract:OBJECTIVES:To compare new versus recurrent concussions with respect to constellation of symptoms, symptom severity, symptom resolution; evaluate potential subset differences with respect to gender and sport; and to compare mechanisms and activities associated with new versus recurrent concussions. METHODS:Sports-relat...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2011-090115
更新日期:2012-06-01 00:00:00
abstract:OBJECTIVES:To compare versions 8 and 10 of the Orchard Sports Injury Classification System (OSICS) to determine whether the revised version of OSICS has improved its use in a sports medicine setting, and to assess the inter-rater reliability of OSICS-10. METHODS:Injury surveillance data, gathered over a 2 year period ...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2008.051979
更新日期:2009-07-01 00:00:00
abstract::We have evaluated the available medical care to sports divers by a postal questionnaire sent to consultants and senior registrars in Accident and Emergency medicine in the UK, assessing their training in underwater medicine. Replies were received from 60 of 96 consultants (63%) and 32 of 58 (55%) senior registrars. Th...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.25.2.102
更新日期:1991-06-01 00:00:00
abstract:OBJECTIVE:To investigate the effect of varying interdental bite platform thickness of the scuba mouthpiece on airway efficiency. METHODS:10 male divers had their mean peak flow measured for free breathing, maximum flow with diving mouthpiece, teeth in occlusion, and for five experimental mouthpieces with different thi...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.30.2.145
更新日期:1996-06-01 00:00:00
abstract::Diastasis of the pubic symphysis is a well documented injury typically associated with high energy trauma. Three cases in horse riders are here described, emphasising the appropriate modern investigation, including computed tomography, and orthopaedic and urological management. ...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.36.1.74
更新日期:2002-02-01 00:00:00
abstract::Jet lag is often cited as a cause of poor sporting performance. We report on the case of a rugby league player who flew 20,000 km and 12 time zones, then repeated the feat a few days later, prior to playing with distinction in an important final match in an international series. ...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2006.034066
更新日期:2007-06-01 00:00:00
abstract:BACKGROUND:The current methods measuring sports activity after anterior cruciate ligament (ACL) injury are commonly restricted to the most knee-demanding sports, and do not consider participation in multiple sports. We therefore developed an online activity survey to prospectively record the monthly participation in al...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2012-092075
更新日期:2014-05-01 00:00:00
abstract::Epidemiological studies of injury in elite and recreational golfers have lacked consistency in methods and definitions employed and this limits comparison of results across studies. In their sports-generic statement, the Consensus Group recruited by the IOC (2020) called for sport-specific consensus statements. On inv...
journal_title:British journal of sports medicine
pub_type: 共识发展会议,杂志文章
doi:10.1136/bjsports-2020-102380
更新日期:2020-10-01 00:00:00
abstract:BACKGROUND:The ability to predict injury is difficult. Prior injury is the only risk factor that has been reported consistently in multiple research studies. Convenient and easy to perform, physical performance tests (PPTs) have great allure as prognostic factors. METHODS:11 PPTs were issued to 359 participants over t...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2015-094885
更新日期:2016-11-01 00:00:00
abstract:BACKGROUND:Home and supervised exercise programmes consisting of stretching and eccentric exercises have been recommended for the management of lateral elbow tendinopathy (LET). No studies have examined their comparative efficacy effectiveness. OBJECTIVE:In this study, whether a home exercise programme is more success...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2008.049759
更新日期:2010-06-01 00:00:00
abstract::Intravascular haemolysis has been found to result from prolonged endurance competition, rigorous military training and participation in impact sports. Haematological research involving the recreational runner is sparse. Recreational runners frequently vary their training to avoid monotony and improve endurance capacit...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.25.4.183
更新日期:1991-12-01 00:00:00
abstract:AIM:To investigate the effect of task familiarisation on the spontaneous pattern of energy expenditure during a series of 2000 m cycling time trials (TTs). METHOD:Nine trained males completed three 2000 m TTs on a Velotron cycling ergometer. To examine pacing strategy, the data were assigned to 250 m "bins," with the ...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2008.056416
更新日期:2009-10-01 00:00:00
abstract:AIM:The aim of this review is to summarise issues surrounding the measurement of physical activity (PA) by self-report and accelerometry in youth (2-18 years old). Current levels and temporal trends in PA and sport participation and the effect of assessment method on data interpretation will be summarised. METHODS:Rel...
journal_title:British journal of sports medicine
pub_type: 杂志文章,评审
doi:10.1136/bjsports-2011-090190
更新日期:2011-09-01 00:00:00
abstract::Athletes such as skaters and skiers inhale large volumes of cold air during exercise and shift from nasal to mouth breathing. Endurance athletes, like cross-country skiers, perform at 80% or more of their maximal oxygen consumption and have minute ventilations in excess of 100 l/min. Cold air is always dry, and endura...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2011-090822
更新日期:2012-05-01 00:00:00
abstract:BACKGROUND:Video analyses reveal that the rate of incidents with a propensity for injury caused by opponent-to-player contact has increased by about 50% from 2000 to 2010 in Norwegian male professional football. The aim of the study was to assess whether a stricter interpretation of the Laws of the Game (red cards for ...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2012-091522
更新日期:2013-05-01 00:00:00
abstract:BACKGROUND:Little information is available on the effect of strength training on vascular function, particularly in older people. OBJECTIVE:To determine the effect of resistance training on arterial stiffness and endothelial function in older adults. METHOD:Eleven healthy men (mean (SEM) age 64 (1) years) performed 1...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2006.029538
更新日期:2006-10-01 00:00:00
abstract:OBJECTIVE:To determine the interobserver and intraobserver reliability of the interpretation of MRIs for supraspinatus tendinosis. METHODS:In the interobserver trial, the MRIs of 52 athletes' shoulders were observed by 3 observers on one occasion within a 2-month period. All 52 images were read by the most experienced...
journal_title:British journal of sports medicine
pub_type: 临床试验,杂志文章
doi:10.1136/bjsm.2006.034421
更新日期:2007-08-01 00:00:00
abstract::The Concussion Recognition Tool 5 (CRT5) is the most recent revision of the Pocket Sport Concussion Assessment Tool 2 that was initially introduced by the Concussion in Sport Group in 2005. The CRT5 is designed to assist non-medically trained individuals to recognise the signs and symptoms of possible sport-related co...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2017-097508
更新日期:2017-06-01 00:00:00
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journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2010.072561
更新日期:2011-04-01 00:00:00
abstract::Mechanotransduction is the physiological process where cells sense and respond to mechanical loads. This paper reclaims the term "mechanotherapy" and presents the current scientific knowledge underpinning how load may be used therapeutically to stimulate tissue repair and remodelling in tendon, muscle, cartilage and b...
journal_title:British journal of sports medicine
pub_type: 杂志文章,评审
doi:10.1136/bjsm.2008.054239
更新日期:2009-04-01 00:00:00
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journal_title:British journal of sports medicine
pub_type: 杂志文章,评审
doi:10.1136/bjsports-2014-094256
更新日期:2015-06-01 00:00:00
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journal_title:British journal of sports medicine
pub_type: 杂志文章,多中心研究
doi:10.1136/bjsm.2008.053637
更新日期:2009-01-01 00:00:00
abstract:OBJECTIVE:During the COVID-19 pandemic, it is essential to understand if and how to screen SARS-CoV-2-positive athletes to safely resume training and competitions. The aim of this study is to understand which investigations are useful in a screening protocol aimed at protecting health but also avoiding inappropriate ex...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2020-102789
更新日期:2021-01-01 00:00:00
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journal_title:British journal of sports medicine
pub_type: 杂志文章,多中心研究
doi:10.1136/bjsm.2008.048512
更新日期:2010-03-01 00:00:00
abstract:AIM:The purpose of this study was to investigate the relationship between physical workload and injury risk in elite youth football players. METHODS:The workload data and injury incidence of 32 players were monitored throughout 2 seasons. Multiple regression was used to compare cumulative (1, 2, 3 and 4-weekly) loads ...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2015-095820
更新日期:2017-03-01 00:00:00
abstract:BACKGROUND:Salbutamol has been shown to mediate anabolic effects after intravenous administration. However, the mechanism responsible for the anabolic actions of salbutamol remains unknown. AIM:To investigate the potential mechanism by which salbutamol mediates anabolic effects in vitro. METHODS:The potential androge...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2007.035162
更新日期:2007-12-01 00:00:00
abstract::Acclimatisation to environmental hypoxia initiates a series of metabolic and musculocardio-respiratory adaptations that influence oxygen transport and utilisation, or better still, being born and raised at altitude, is necessary to achieve optimal physical performance at altitude, scientific evidence to support the po...
journal_title:British journal of sports medicine
pub_type: 杂志文章,评审
doi:10.1136/bjsm.31.3.183
更新日期:1997-09-01 00:00:00
abstract::Rheumatic complaints are common in patients with diabetes. Maintaining good glycaemic control by exercise, diet, and medication improves or prevents the development of rheumatic conditions. ...
journal_title:British journal of sports medicine
pub_type: 杂志文章,评审
doi:10.1136/bjsm.37.1.30
更新日期:2003-02-01 00:00:00
abstract:OBJECTIVE:To review and determine the effectiveness of exercise treatment in osteoarthritis of the knee. METHODS:A computerised literature search of Medline was carried out searching between June 1966 and January 2000. RESULTS:Twenty three randomised controlled trials were identified from the literature. Only three t...
journal_title:British journal of sports medicine
pub_type: 杂志文章,评审
doi:10.1136/bjsm.34.5.326
更新日期:2000-10-01 00:00:00
abstract::The exon-1 of the androgen receptor (AR) gene contains two repeat length polymorphisms which modify either the amount of AR protein inside the cell (GGN(n), polyglycine) or its transcriptional activity (CAG(n), polyglutamine). Shorter CAG and/or GGN repeats provide stronger androgen signalling and vice versa. To test ...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2009.060285
更新日期:2011-02-01 00:00:00