Abstract:
OBJECTIVES:To investigate the validity and reliability of surface electromyography (EMG) as a new non-invasive determinant of the metabolic response to incremental exercise in elite cyclists. The relation between EMG activity and other more conventional methods for analysing the aerobic-anaerobic transition such as blood lactate measurements (lactate threshold (LT) and onset of blood lactate accumulation (OBLA)) and ventilatory parameters (ventilatory thresholds 1 and 2 (VT1 and VT2)) was studied. METHODS:Twenty eight elite road cyclists (age 24 (4) years; VO2MAX 69.9 (6.4) ml/kg/min; values mean (SD)) were selected as subjects. Each of them performed a ramp protocol (starting at 0 W, with increases of 5 W every 12 seconds) on a cycle ergometer (validity study). In addition, 15 of them performed the same test twice (reliability study). During the tests, data on gas exchange and blood lactate levels were collected to determine VT1, VT2, LT, and OBLA. The root mean squares of EMG signals (rms-EMG) were recorded from both the vastus lateralis and the rectus femoris at each intensity using surface electrodes. RESULTS:A two threshold response was detected in the rms-EMG recordings from both muscles in 90% of subjects, with two breakpoints, EMGT1 and EMGT2, at around 60-70% and 80-90% of VO2MAX respectively. The results of the reliability study showed no significant differences (p > 0.05) between mean values of EMGT1 and EMGT2 obtained in both tests. Furthermore, no significant differences (p > 0.05) existed between mean values of EMGT1, in the vastus lateralis and rectus femoris, and VT1 and LT (62.8 (14.5) and 69.0 (6.2) and 64.6 (6.4) and 68.7 (8.2)% of VO2MAX respectively), or between mean values of EMGT2, in the vastus lateralis and rectus femoris, and VT2 and OBLA (86.9 (9.0) and 88.0 (6.2) and 84.6 (6.5) and 87.7 (6.4)% of VO2MAX respectively). CONCLUSION:rms-EMG may be a useful complementary non-invasive method for analysing the aerobic-anaerobic transition (ventilatory and lactate thresholds) in elite cyclists.
journal_name
Br J Sports Medjournal_title
British journal of sports medicineauthors
Lucía A,Sánchez O,Carvajal A,Chicharro JLdoi
10.1136/bjsm.33.3.178keywords:
subject
Has Abstractpub_date
1999-06-01 00:00:00pages
178-85issue
3eissn
0306-3674issn
1473-0480journal_volume
33pub_type
临床试验,杂志文章abstract::Over 100 000 solid organ transplants are performed worldwide each year and this has a significant impact on physical function and quality of life. However, the capacity for exercise in solid-organ recipients is reduced. Regular physical activity improves most of the indices of fitness in these patients but, with few e...
journal_title:British journal of sports medicine
pub_type: 杂志文章,评审
doi:10.1136/bjsports-2014-093583
更新日期:2015-01-01 00:00:00
abstract::Ankle sprain is a common sports injury and is often regarded as trivial by athletes and coaches. This epidemiological study was conducted among three categories of Hong Kong Chinese athletes: national teams, competitive athletes and recreational athletes. This study shows that as much as 73% of all athletes had recurr...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.28.2.112
更新日期:1994-06-01 00:00:00
abstract::Preparticipation screening programmes for underlying cardiac pathologies are now commonplace for many international sporting organisations. However, providing medical clearance for an asymptomatic athlete without a family history of sudden cardiac death (SCD) is especially challenging when the athlete demonstrates par...
journal_title:British journal of sports medicine
pub_type: 杂志文章,评审
doi:10.1136/bjsports-2011-090838
更新日期:2012-11-01 00:00:00
abstract::In Part II of the study, the British Olympic track (sprint) squad cyclists demonstrated reductions in body fat index, % body fat and endomorphy (p greater than .05), increased Hb and PCV % (p greater than .05), and lowered HR at rest and in warm-up exercise (p greater than .05), but no change in leg power. Repeated in...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.16.1.13
更新日期:1982-03-01 00:00:00
abstract::The Injury Prevention Research Unit was established in 1990 to reduce the incidence, severity and consequences of injury. Research into sport and recreational injury is one of five major areas of research being undertaken. National data sources have been used to estimate the overall size of the problem and to describe...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.28.4.221
更新日期:1994-12-01 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:OBJECTIVE:To quantify and describe medically treated sport and active recreation injuries in a defined region of the Latrobe Valley from 7 November 1994 to 6 November 1995. METHOD:A geographic target area was defined, restricted to the six postcodes that fell wholly within the catchment area of the Latrobe Regional Ho...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.37.5.405
更新日期:2003-01-01 00:00:00
abstract:BACKGROUND:Course setting has often been discussed as a potential preventative measure in the World Cup ski-racing community. However, there is limited understanding of how it is related to injury risk. OBJECTIVE:This study was undertaken to investigate the effect of increased horizontal gate distance on energy-relate...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2012-091425
更新日期:2012-12-01 00:00:00
abstract:OBJECTIVE:To determine whether the psychological characteristics of athletes who have undergone an anterior cruciate ligament (ACL) reconstruction change during rehabilitation are related to returning to competitive sport. DESIGN:Prospective longitudinal study. METHOD:87 athletes completed the Emotional Response of A...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2007.044818
更新日期:2009-05-01 00:00:00
abstract::A stress fracture represents the inability of the skeleton to withstand repetitive bouts of mechanical loading, which results in structural fatigue, and resultant signs and symptoms of localised pain and tenderness. Reports of stress fractures in female football players are not prevalent; however, they are probably un...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2007.037804
更新日期:2007-08-01 00:00:00
abstract:BACKGROUND:Chronic painful insertional Achilles tendinopathy is seen in both physically active and non-active individuals. Painful eccentric training, where the patients load the Achilles tendon into full dorsiflexion, has shown good results in patients with mid-portion Achilles tendinosis. However, only 32% of patient...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2007.039545
更新日期:2008-09-01 00:00:00
abstract::Team sports are increasingly popular, with millions of participants worldwide. Athletes engaged in these sports are required to repeatedly produce skilful actions and maximal or near-maximal efforts (eg, accelerations, changes in pace and direction, sprints, jumps and kicks), interspersed with brief recovery intervals...
journal_title:British journal of sports medicine
pub_type: 杂志文章,评审
doi:10.1136/bjsports-2013-092950
更新日期:2013-12-01 00:00:00
abstract:BACKGROUND:The mechanism that causes pain in chronic Achilles tendinosis is not known. However, high resolution colour Doppler ultrasound has shown that neovascularisation may be involved. OBJECTIVE:To investigate if sclerosing the neovessels would affect the level of tendon pain. METHODS:The effect of colour Doppler...
journal_title:British journal of sports medicine
pub_type: 临床试验,杂志文章
doi:10.1136/bjsm.36.3.173
更新日期:2002-06-01 00:00:00
abstract:OBJECTIVES:To compare the efficacy and safety of topical non-steroidal anti-inflammatory drugs (NSAIDs), including salicylate, for the treatment of osteoarthritis (OA). METHODS:PubMed, Embase, Cochrane Library and Web of Science were searched from 1966 to January 2017. Randomised controlled trials (RCTs) comparing top...
journal_title:British journal of sports medicine
pub_type: 杂志文章,meta分析,评审
doi:10.1136/bjsports-2017-098043
更新日期:2018-05-01 00:00:00
abstract:OBJECTIVE:To determine the plasma glucose levels in non-diabetic patients with rotator cuff tear. DESIGN:Frequency-matched case-control study. SETTING:University Teaching Hospital. PARTICIPANTS:The study included 194 subjects who were operated on at our institution. Group 1 included 97 consecutive patients (36 men a...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2008.049320
更新日期:2009-04-01 00:00:00
abstract::A case of bilateral stress fractures of the ulnae in a Kendo (Japanese fencing) player is reported; the mechanism of the fractures, particularly the difference in the site of fracture between the right and left ulna, is discussed. ...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.32.4.340
更新日期:1998-12-01 00:00:00
abstract:OBJECTIVES:Physique traits and their relationship to competitive success were assessed amongst lightweight rowers competing at the 2003 Australian Rowing Championships. METHODS:Full anthropometric profiles were collected from 107 lightweight rowers (n = 65 males, n = 45 females) competing in the Under 23 and Open age ...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2004.015990
更新日期:2005-10-01 00:00:00
abstract::A case of bilateral anterior glenohumeral dislocation in a young weight trainer is presented. The patient, an insurance clerk, had been using a free weight bar in the bench press position and had become tired when the weight on the bar forced his arms into hyperextension in the mid-abducted position. The humeral shaft...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.32.1.71
更新日期:1998-03-01 00:00:00
abstract:BACKGROUND:Older people are at high risk of physical inactivity. Activity trackers can facilitate physical activity. We aimed to investigate the effect of interventions using activity trackers on physical activity, mobility, quality of life and mental health among people aged 60+ years. METHODS:For this systematic rev...
journal_title:British journal of sports medicine
pub_type: 杂志文章,meta分析
doi:10.1136/bjsports-2018-100324
更新日期:2020-10-01 00:00:00
abstract:BACKGROUND:The Active Script Programme (ASP) aimed to increase the number of general practitioners (GPs) in Victoria, Australia who deliver appropriate, consistent, and effective advice on physical activity to patients. To maximise GP participation, a capacity building strategy within Divisions of General Practice (DGP...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2002.001297
更新日期:2004-02-01 00:00:00
abstract:BACKGROUND:Musculotendinous overuse injuries are prevalent in people with type 2 diabetes. Non-enzymatic glycosylation of collagen resulting in tendon stiffening may play a role. In this case-control study we determined whether patients with diabetes had poorer ultrasonographic structure in their Achilles tendons compa...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsports-2014-093696
更新日期:2015-08-01 00:00:00
abstract:OBJECTIVE:Previous meta-analyses have found that exercise prevents falls in older people. This study aimed to test whether this effect is still present when new trials are added, and it explores whether characteristics of the trial design, sample or intervention are associated with greater fall prevention effects. DES...
journal_title:British journal of sports medicine
pub_type: 杂志文章,meta分析,评审
doi:10.1136/bjsports-2016-096547
更新日期:2017-12-01 00:00:00
abstract:BACKGROUND:Achilles tendinopathies are characterised by pain and reduced function, and heavy-load exercises have been shown to be effective in the treatment of painful chronic Achilles tendinopathies. However, basic information is needed on how the biomechanics and neuromuscular control of the exercise are affected by ...
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:OBJECTIVES:A matched case-control study was carried out to evaluate biological risk indicators for recurrent non-specific low back pain in adolescents. METHODS:Adolescents with recurrent non-specific low back pain (symptomatic; n = 28; mean (SD) age 14.9 (0.7) years) and matched controls (asymptomatic; n = 28; age 14....
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2003.009951
更新日期:2005-03-01 00:00:00
abstract::Hypothermia is a serious condition, often with fatal consequences. The physiology and mechanisms of hypothermia in mountainous areas are discussed. It is as important to facilitate heat loss, especially during periods of high exertion, as it is to maintain heat production and preserve insulation. This can be partly ac...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.37.6.548
更新日期:2003-12-01 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:OBJECTIVE:To test the hypothesis that microwave hyperthermia treatment (MHT) increases heat shock proteins (HSPs) in the human vastus lateralis muscle. METHODS:Four untrained healthy male volunteers participated in this study. The lateral side of the thigh of one leg (heated leg) was heated with a microwave generator ...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2006.032938
更新日期:2007-07-01 00:00:00
abstract:OBJECTIVES:To investigate the effects of strenuous exercise on commonly used biochemical and haematological variables in subjects running the 2002 London marathon. METHODS:34 healthy volunteers (7 female, 27 male) were recruited for the study. Blood was taken before the start (at registration) and immediately after co...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2002.002873
更新日期:2004-06-01 00:00:00
abstract::Custom made maxillary mouthguards made from thermoplastic materials using dental impressions give valuable protection to the teeth and jaws of participants in contact sports. A bimaxillary mouthguard has been described which offers enhanced protection, but with considerable increase in cost. This paper describes a mod...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.21.2.27
更新日期:1987-06-01 00:00:00
abstract:BACKGROUND:There are controversial data about the relation between foot morphology and athletic injuries of the lower extremity. Studies in soldiers have shown some relationship, whereas those involving athletes have not shown any significant relationship. The reason for these differences is not clear. OBJECTIVE:To de...
journal_title:British journal of sports medicine
pub_type: 杂志文章
doi:10.1136/bjsm.2003.011478
更新日期:2005-02-01 00:00:00