Abstract：
BACKGROUND:Blood lactate concentration (BLC) can be used to monitor relative exercise intensity. The highest BLC representing an equilibrium between lactate production and elimination is termed maximal lactate steady state (MLSS). MLSS is used to discriminate qualitatively between continuous exercise, which is limited by stored energy, from other types of exercise terminated because of disturbance of cellular homoeostasis. AIM:To investigate the hypothesis that MLSS intraindividually depends on the mode of exercise. METHODS:Six junior male rowers (16.5 (1.4) years, 181.7 (3.1) cm, 69.8 (3.3) kg) performed incremental and constant load tests on rowing and cycle ergometers. Measurements included BLC, sampled from the hyperaemic ear flap, heart rate, and oxygen uptake. MLSS was defined as the highest BLC that increased by no more than 1.0 mmol/l during the final 20 minutes of constant workload. RESULTS:In all subjects, MLSS was lower (p < or = 0.05) during rowing (2.7 (0.6) mmol/l) than during cycling (4.5 (1.0) mmol/l). No differences between rowing and cycling were found with respect to MLSS heart rate (169.2 (9.3) v 172.3 (6.7) beats/min), MLSS workload (178.7 (29.8) v 205.0 (20.7) W), MLSS intensity expressed as a percentage (63.3 (6.6)% v 68.6 (3.8)%) of peak workload (280.8 (15.9) v 299.2 (28.4) W) or percentage (76.4 (3.4)% v 75.1 (3.0)%) of peak oxygen uptake (60.4 (3.4) v 57.2 (8.6) ml/kg/min). CONCLUSIONS:In rowing and cycling, the MLSS but not MLSS workload and MLSS intensity intraindividually depends on the motor pattern of exercise. MLSS seems to decrease with increasing mass of the primarily engaged muscle. This indicates that task specific levels of MLSS occur at distinct levels of power output per unit of primarily engaged muscle mass.
journal_name
Br J Sports Medjournal_title
British journal of sports medicineauthors
Beneke R,Leithäuser RM,Hütler Mdoi
10.1136/bjsm.35.3.192keywords:
subject
Has Abstractpub_date
2001-06-01 00:00:00pages
192-6issue
3eissn
0306-3674issn
1473-0480journal_volume
35pub_type
杂志文章abstract：:Swimming pool water slides are becoming increasingly long and adventurous. This case report and survey suggest that they may carry with them a notable risk of friction burns. ...
journal_title：British journal of sports medicine
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journal_title：British journal of sports medicine
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journal_title：British journal of sports medicine
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doi：10.1136/bjsm.2008.056903
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doi：10.1136/bjsports-2018-100002
更新日期：2019-04-01 00:00:00
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journal_title：British journal of sports medicine
pub_type： 杂志文章
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journal_title：British journal of sports medicine
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doi：10.1136/bjsports-2016-096606
更新日期：2016-11-01 00:00:00
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journal_title：British journal of sports medicine
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doi：10.1136/bjsports-2012-091522
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journal_title：British journal of sports medicine
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更新日期：2014-04-01 00:00:00
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doi：10.1136/bjsports-2015-095718
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pub_type： 杂志文章
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journal_title：British journal of sports medicine
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更新日期：2009-10-01 00:00:00
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更新日期：2003-08-01 00:00:00
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journal_title：British journal of sports medicine
pub_type： 杂志文章
doi：10.1136/bjsm.2003.005470
更新日期：2004-08-01 00:00:00
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journal_title：British journal of sports medicine
pub_type： 杂志文章,评审
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pub_type： 杂志文章
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pub_type： 杂志文章,评审
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更新日期：2011-09-01 00:00:00
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更新日期：1980-12-01 00:00:00
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journal_title：British journal of sports medicine
pub_type： 杂志文章,评审
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更新日期：2014-06-01 00:00:00
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更新日期：2014-06-01 00:00:00
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pub_type： 临床试验,杂志文章,随机对照试验
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更新日期：2012-09-01 00:00:00
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更新日期：2010-05-01 00:00:00
