Abstract:
PURPOSE:The asthmatic airway responds to exercise by bronchodilation (BD) during and bronchoconstriction (BC) after exercise. A refractory period induced by an initial exercise challenge that provides protection against BC during a subsequent exercise bout has also been observed. However, no studies examining during-exercise response or refractoriness during long-duration field exercise by elite athletes have been performed. This study examined airway response and refractoriness during approximately 42-min cross-country ski time trial preceded by a 6- to 9-min 2.5-km high-intensity warm-up ski. METHODS:Eighteen elite athletes cross-country skied seven successive 2.5-km loops. Spirometry was performed pre- and at 5, 10, and 15 min post loop 1; loops 2-7 were treated as a race (XCR) with maneuvers performed within 20 s after loops 2-6 and serially for 15 min after lap 7. RESULTS:Nine of 18 subjects demonstrated a >or=10% fall from baseline in FEV(1) (EIB+): five after lap 1 and four during or after laps 2-7. FEV(1) for EIB+ athletes during XCR was not different from post lap 1 FEV. Only one EIB+ subject demonstrated significant refractoriness. Four EIB+ athletes had a less than 10% fall in FEV after the initial 2.5-km exercise challenge but developed EIB (>or=10% fall) during the subsequent 6 x 2.5 km XCR exercise challenge. FEF(25-75) falls mirrored FEV(1), but demonstrated greater BD during XCR. CONCLUSION:Bronchoconstriction occurs in athletes during prolonged exercise and may thus influence performance. Variability in bronchial hyperresponsiveness onset and the lack of significant refractoriness in our study cohort of athletes is consistent with an exercise bronchoconstrictive dysfunction that is different than frank asthma and is yet to be clearly defined.
journal_name
Med Sci Sports Exercjournal_title
Medicine and science in sports and exerciseauthors
Rundell KW,Spiering BA,Judelson DA,Wilson MHdoi
10.1097/00005768-200301000-00004subject
Has Abstractpub_date
2003-01-01 00:00:00pages
18-26issue
1eissn
0195-9131issn
1530-0315journal_volume
35pub_type
杂志文章abstract:PURPOSE:To compare the maximum oxygen uptake V0(2max) of elite endurance athletes and to explain why the body mass exponent, necessary to render V0(2max) independent of body mass, appears to be greater than 0.67. METHODS:Study 1: V0(2max) of 174 international sportsmen and women was assessed. Athletes were recruited f...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.MSS.0000053728.12929.5D
更新日期:2003-03-01 00:00:00
abstract::The influence of somatotype on the validity of anthropometric prediction of body density (Db) in young women (N = 92) was investigated. Three groups of predominantly endomorph (N = 27), mesomorph (N = 35), and ectomorph (N = 30) women were identified by the Heath-Carter and Sheldon somatotyping methods. Discriminant a...
journal_title:Medicine and science in sports and exercise
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journal_title:Medicine and science in sports and exercise
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doi:10.1249/01.mss.0000121954.95892.c8
更新日期:2004-04-01 00:00:00
abstract:INTRODUCTION:Chronic unimanual motor practice increases the motor output not only in the trained but also in the nonexercised homologous muscle in the opposite limb. We examined the hypothesis that adaptations in motor cortical excitability of the nontrained primary motor cortex (iM1) and in interhemispheric inhibition...
journal_title:Medicine and science in sports and exercise
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journal_title:Medicine and science in sports and exercise
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pub_type: 临床试验,杂志文章
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更新日期:2005-01-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,随机对照试验
doi:10.1249/MSS.0000000000001223
更新日期:2017-06-01 00:00:00
abstract:PURPOSE:The rapidly increasing incidence of Lyme disease has become a serious public health problem. Persistent symptoms of Lyme disease occur in over 40% of the 300,000 new cases diagnosed annually in the United States and often include debilitating musculoskeletal pain, fatigue, and poor health-related quality of lif...
journal_title:Medicine and science in sports and exercise
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doi:10.1249/MSS.0000000000000683
更新日期:2015-11-01 00:00:00
abstract::To study effort tolerance in elderly women with different physical activity backgrounds, 52 physically active (PA) and 42 sedentary control women (CO) aged 66-85 yr were assigned to perform cycle ergometer exercise to their volitional maximum. Oxygen uptake, respiratory exchange ratio (RER), heart rate, work power, an...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-199801000-00024
更新日期:1998-01-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200205000-00004
更新日期:2002-05-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000001082
更新日期:2017-01-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,meta分析,评审
doi:10.1249/MSS.0000000000000567
更新日期:2015-07-01 00:00:00
abstract::The effects of weight loss (dehydration) techniques (which mimicked techniques used prior to actual competition) used by intercollegiate wrestlers on selected physiological parameters (strength, anaerobic power, anaerobic capacity, the lactate threshold (LT), and peak aerobic power) were examined in seven intercollegi...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1990-04-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000000835
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journal_title:Medicine and science in sports and exercise
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doi:10.1249/MSS.0b013e31825e19fd
更新日期:2012-11-01 00:00:00
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更新日期:2018-01-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200112000-00024
更新日期:2001-12-01 00:00:00
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更新日期:2003-08-01 00:00:00
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journal_title:Medicine and science in sports and exercise
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doi:10.1249/00005768-199402000-00013
更新日期:1994-02-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,评审
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更新日期:2008-04-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,评审
doi:
更新日期:1984-12-01 00:00:00
abstract::It is commonly believed that exposure to cold environmental temperatures depresses immune function and increases the risk for infection. This review paper will 1) present an overview of human physiological responses to cold exposure, 2) present the human studies examining the effects of cold exposure on immune respons...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,评审
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更新日期:2002-12-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:2003-04-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,评审
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journal_title:Medicine and science in sports and exercise
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更新日期:1999-11-01 00:00:00