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 potentiating effects after return to sea level is at present equivocal. Despite this, elite athletes continue to spend considerable time and resources training at altitude, misled by subjective coaching opinion and the inconclusive findings of a large number of uncontrolled studies. Scientific investigation has focused on the optimisation of the theoretically beneficial aspects of altitude acclimatisation, which include increases in blood haemoglobin concentration, elevated buffering capacity, and improvements in the structural and biochemical properties of skeletal muscle. However, not all aspects of altitude acclimatisation are beneficial; cardiac output and blood flow to skeletal muscles decrease, and preliminary evidence has shown that hypoxia in itself is responsible for a depression of immune function and increased tissue damage mediated by oxidative stress. Future research needs to focus on these less beneficial aspects of altitude training, the implications of which pose a threat to both the fitness and the health of the elite competitor. Paul Bert was the first investigator to show that acclimatisation to a chronically reduced inspiratory partial pressure of oxygen (P1O2) invoked a series of central and peripheral adaptations that served to maintain adequate tissue oxygenation in healthy skeletal muscle, physiological adaptations that have been subsequently implicated in the improvement in exercise performance during altitude acclimatisation. However, it was not until half a century later that scientists suggested that the additive stimulus of environmental hypoxia could potentially compound the normal physiological adaptations to endurance training and accelerate performance improvements after return to sea level. This has stimulated an exponential increase in scientific research, and, since 1984, 22 major reviews have summarised the physiological implications of altitude training for both aerobic and anaerobic performance at altitude and after return to sea level. Of these reviews, only eight have specifically focused on physical performance changes after return to sea level, the most comprehensive of which was recently written by Wolski et al. Few reviews have considered the potentially less favourable physiological responses to moderate altitude exposure, which include decreases in absolute training intensity, decreased plasma volume, depression of haemopoiesis and increased haemolysis, increases in sympathetically mediated glycogen depletion at altitude, and increased respiratory muscle work after return to sea level. In addition, there is a risk of developing more serious medical complications at altitude, which include acute mountain sickness, pulmonary oedema, cardiac arrhythmias, and cerebral hypoxia. The possible implications of changes in immune function at altitude have also been largely ignored, despite accumulating evidence of hypoxia mediated immunosuppression. In general, altitude training has been shown to improve performance at altitude, whereas no unequivocal evidence exists to support the claim that performance at sea level is improved. Table 1 summarises the theoretical advantages and disadvantages of altitude training for sea level performance. This review summarises the physiological rationale for altitude training as a means of enhancing endurance performance after return to sea level. Factors that have been shown to affect the acclimatisation process and the subsequent implications for exercise performance at sea level will also be discussed. Studies were located using five major database searches, which included Medline, Embase, Science Citation Index, Sports Discus, and Sport, in
journal_name
Br J Sports Medjournal_title
British journal of sports medicineauthors
Bailey DM,Davies Bdoi
10.1136/bjsm.31.3.183subject
Has Abstractpub_date
1997-09-01 00:00:00pages
183-90issue
3eissn
0306-3674issn
1473-0480journal_volume
31pub_type
杂志文章,评审abstract:AIM:To compare surgical and conservative treatment for high-risk stress fractures of the anterior tibial cortex, navicular and proximal fifth metatarsal. METHODS:Systematic searches of CENTRAL, MEDLINE, EMBASE, CINAHL, SPORTDiscus and PEDro were performed to identify relevant prospective and retrospective studies. Two...
journal_title:British journal of sports medicine
pub_type: 杂志文章,评审
doi:10.1136/bjsports-2013-093246
更新日期:2015-03-01 00:00:00
abstract:BACKGROUND:Physicians are increasingly being called upon to promote physical activity (PA) among patients. However, a paucity of exercise medicine teaching in the UK undergraduate medical curricula prevents students from acquiring the necessary knowledge and skills to do so. To address this issue, King's College London...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2013-092386
更新日期:2013-11-01 00:00:00
abstract:BACKGROUND/AIM:The Achilles tendon is a tissue that responds to mechanical loads at a molecular and cellular level. In vitro and in vivo studies have shown that the expression of anabolic and/or catabolic proteins can change within hours of loading and return to baseline levels within 72 h. These biochemical changes ha...
journal_title:British journal of sports medicine
pub_type: 杂志文章,随机对照试验
doi:10.1136/bjsports-2013-092713
更新日期:2015-02-01 00:00:00
abstract:AIM:To investigate the level of translation of the Australian Rugby Union 'Mayday' safety procedure into practice among community rugby union coaches in New South Wales (Australia). METHODS:All registered coaches of senior community rugby union teams in five zones/associations in the north-eastern region of the state ...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2011-090469
更新日期:2012-06-01 00:00:00
abstract:OBJECTIVES:To study the long term effect of tibial shaft fractures treated by immobilisation in a long leg cast on the calf muscle bulk. METHODS:Computed tomography scans were performed at fixed points on the lower legs of 23 non-professional athletes who sustained closed tibial fractures 16 years previously. Length o...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2005.020743
更新日期:2006-06-01 00:00:00
abstract:OBJECTIVE:Back protectors for snowboarders were analysed with respect to their potential to prevent spinal injury. DESIGN:In 20 Swiss skiing resorts, athletes were interviewed on the slope. In addition, an online survey was conducted. The performance of 12 commercially available back protectors was investigated by mea...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2010.072728
更新日期:2010-09-01 00:00:00
abstract::The rehabilitation of the knee with a deficient anterior cruciate ligament (ACL) always presents a great challenge. Isokinetic assessment allows muscle performance to be quantified. The antishear device, introduced by Johnson, has the distinct advantage of minimizing the anterior translation force during isokinetic ex...
journal_title:British journal of sports medicine
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1136/bjsm.29.3.171
更新日期:1995-09-01 00:00:00
abstract::Osteoarthritis (OA) is a common degenerative disease of joints. The major clinical features are pain and stiffness, leading to a decline in physical function, which may ultimately require joint replacement surgery. As no cure exists, current medical intervention focuses on symptomatic relief. Moreover, as no cure is i...
journal_title:British journal of sports medicine
pub_type: 杂志文章,评审
doi:10.1136/bjsm.2004.011841
更新日期:2005-01-01 00:00:00
abstract:BACKGROUND:Prevention of sport injuries and illnesses is a focus for epidemiological surveillance. OBJECTIVES:To record and analyse all sports injuries and illnesses registered during the second Asian Beach Games. DESIGN:A descriptive epidemiological study using the International Olympic Committee Surveillance system...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2011-090852
更新日期:2012-09-01 00:00:00
abstract:OBJECTIVE:To analyse risk factors leading to injuries during snowboarding. DESIGN:A case-control multicentre survey of injured and non-injured snowboarders. SETTING:One tertiary and two secondary trauma centres in Bern, Switzerland. METHODS:All snowboard injuries admitted to our tertiary and two affiliated secondary...
journal_title:British journal of sports medicine
pub_type: 杂志文章,多中心研究
doi:10.1136/bjsm.2010.071357
更新日期:2010-09-01 00:00:00
abstract::In a one-year prospective study of 42 elite orienteers, 73 recent injuries (1.7 per runner per year) were found. Acute injuries totalled 52% and 48% were due to overuse. Ankle sprains made up 37% of acute injuries while the remaining were mainly contusions caused by falls or bumps against branches or rocks. Medial shi...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.20.3.125
更新日期:1986-09-01 00:00:00
abstract:OBJECTIVES:To investigate the effects of two different regimens of androgenic-anabolic steroid (AAS) administration on serum lipid and lipoproteins, and recovery of these variables after drug cessation, as indicators of the risk for cardiovascular disease in healthy male strength athletes. METHODS:In a non-blinded stu...
journal_title:British journal of sports medicine
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1136/bjsm.2003.000199
更新日期:2004-06-01 00:00:00
abstract:BACKGROUND:The majority of sporting injuries are clinically diagnosed using history and physical examination as the cornerstone. There are no studies supporting the reliability of making a clinical diagnosis of medial tibial stress syndrome (MTSS). AIM:Our aim was to assess if MTSS can be diagnosed reliably, using his...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2016-097037
更新日期:2018-10-01 00:00:00
abstract:PURPOSE:Physical fitness may confer protection from thrombosis; however, exercise-induced platelet activation may be involved in the triggering of acute vascular events. This study aimed to assess haemostatic responses to acute exercise in trained and sedentary middle-aged subjects. METHODS:21 first class Scottish foo...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2008.053306
更新日期:2010-06-01 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::Thirty one amateur skiers with 33 knees which had had a symptomatic chronic rupture of the anterior cruciate ligament (ACL) treated with the Lemaire operation were reviewed retrospectively at an average of 4.5 years. Of the patients 23 were women. The operation failed to control symptoms in 17 out of the 33 knees. How...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.28.1.31
更新日期:1994-03-01 00:00:00
abstract:AIMS:To prospectively follow a cohort of elite young male professional soccer players with sequential symptom questionnaires and imaging of the anterior pelvis to determine the prevalence and severity of imaging findings. METHODS:34 male athletes (mean age 16.5 years) underwent clinical examination, history/symptom qu...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2013-092932
更新日期:2015-02-01 00:00:00
abstract:BACKGROUND:Physical exercise is seen as a promising intervention to prevent or delay cognitive decline in individuals aged 50 years and older, yet the evidence from reviews is not conclusive. OBJECTIVES:To determine if physical exercise is effective in improving cognitive function in this population. DESIGN:Systemati...
journal_title:British journal of sports medicine
pub_type: 杂志文章,meta分析,评审
doi:10.1136/bjsports-2016-096587
更新日期:2018-02-01 00:00:00
abstract::This study was designed to examine the effect of exercise intensity on the magnitude and duration of excess postexercise oxygen consumption (EPOC) in women. On separate days and in a counterbalanced order, seven moderately active young adult women performed a 850 kJ cycle ergometer exercise at an intensity of 40 or 60...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.25.1.38
更新日期:1991-03-01 00:00:00
abstract:OBJECTIVES:To assess the results of inferior capsular shift for multidirectional instability of the shoulder in athletes. METHODS:Multidirectional instability was surgically corrected in 53 shoulders in 47 athletes who engaged in contact sports. A history of major trauma was found in eight patients, the others having ...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.36.4.290
更新日期:2002-08-01 00:00:00
abstract:OBJECTIVES:The authors studied the association of leisure-time physical activity (LTPA) with clustered and individual metabolic risk factors in adolescents taking into account diet and pubertal status. The authors also studied whether screen time was associated with clustered risk. METHODS:Self-reported LTPA and scree...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2010.073239
更新日期:2012-02-01 00:00:00
abstract:BACKGROUND:Few interventions reduce patellar tendinopathy (PT) pain in the short term. Eccentric exercises are painful and have limited effectiveness during the competitive season. Isometric and isotonic muscle contractions may have an immediate effect on PT pain. METHODS:This single-blinded, randomised cross-over stu...
journal_title:British journal of sports medicine
pub_type: 杂志文章,随机对照试验
doi:10.1136/bjsports-2014-094386
更新日期:2015-10-01 00:00:00
abstract:OBJECTIVE:To evaluate and synthesise the literature on hip strength among patients with patellofemoral pain (PFP) to address the following: (1) differentiate between hip strength as a risk factor and associated deficit in PFP; (2) describe hip strength in men and women with PFP across different age ranges; (3) investig...
journal_title:British journal of sports medicine
pub_type: 杂志文章,meta分析,评审
doi:10.1136/bjsports-2013-093305
更新日期:2014-07-01 00:00:00
abstract::A professional rugby league player sustained a left eyebrow laceration during a match which immediately started to bleed. Within seconds he was taken to the sideline and had the laceration closed with six staples by the team doctor. Bleeding was arrested and he returned to play, taking the ball within 80 s of sufferin...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2003.005470
更新日期:2004-08-01 00:00:00
abstract:BACKGROUND:Swimming is a widespread sporting activity generally regarded as an ideal form of exercise, which has little or no impact on the knees. However, overuse or repetitive microtrauma injuries may often affect the knee joint of young competitive swimmers. These early lesions are frequently asymptomatic for a cons...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2010.083345
更新日期:2012-03-01 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:BACKGROUND:Screening to prevent sudden cardiac death remains a contentious topic in sport and exercise medicine. The aim of this study was to assess whether the use of a standardised criteria tool improves the accuracy of ECG interpretation by physicians screening athletes. METHODS:Design: Randomised control trial. St...
journal_title:British journal of sports medicine
pub_type: 杂志文章,随机对照试验
doi:10.1136/bjsports-2013-093360
更新日期:2014-08-01 00:00:00
abstract:AIMS:(1) To assess the 1-year and 6-year courses of non-traumatic knee symptoms in adolescents and young adults presenting in general practice. (2) To identify prognostic factors for persistent knee symptoms at 1-year follow-up. METHODS:Adolescents and young adults (12-35 years; n=172) with non-traumatic knee symptoms...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2014-093557
更新日期:2015-03-01 00:00:00
abstract::During the competitive season of 1990, 155 British triathletes whose competitive distances varied from sprint to full ironman, and who self-classified themselves as recreational, intermediate or élite, kept a training diary for an 8-week period. They gave details of injuries sustained while training for, or competing ...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.28.3.191
更新日期:1994-09-01 00:00:00
abstract::It is now understood that sports injury interventions will not have significant public health impact if they are not widely accepted and adopted by target sports participants. Although there has been increasing recognition of the need for intervention studies conducted within the real-world context of sports delivery,...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2011-090230
更新日期:2011-12-01 00:00:00