Abstract:
:To determine the adaptations of the autonomic nervous system in the control of heart rate and blood pressure induced by endurance training, 10 competitive cyclists aged 27 +/- 7 years and 10 age-, weight- and height-matched sedentary controls were subjected to Power Spectral Analysis of the RR interval and of blood pressure at supine rest and during submaximal cycloergometric exercise test in the supine position at 20% and 40% of maximal workload. At rest, the high-frequency (HF) power of the RR interval was higher in cyclists (p < 0.05) compared to controls, whereas the power spectrum of both systolic and diastolic blood pressure did not differ between cyclists and controls. During exercise the variance, the low-frequency (LF) and the HF power of the RR interval decreased significantly (p < 0.005) and similarly in cyclists and controls. The LF/HF ratio of the RR interval increased (p < 0.001) and the alfa index of baroreflex sensitivity decreased (p < 0.05) without differences between cyclists and controls. The variance of both systolic and diastolic blood pressure increased (p < 0.001 and p < 0.005, respectively) as well as the HF power of systolic blood pressure (p < 0.001) similarly in cyclists and in controls. In conclusion, the data of the present study suggest that competitive cycling causes an enhanced vagal drive to the sinus node, whereas the neural control of blood pressure is not affected. During exercise a vagal withdrawal and a sympathetic activation in the neural control of heart rate, together with a reduction of baroreflex sensitivity are operative. These changes are similar in cyclists and controls.
journal_name
Int J Sports Medjournal_title
International journal of sports medicineauthors
Macor F,Fagard R,Amery Adoi
10.1055/s-2007-972828subject
Has Abstractpub_date
1996-04-01 00:00:00pages
175-81issue
3eissn
0172-4622issn
1439-3964journal_volume
17pub_type
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journal_title:International journal of sports medicine
pub_type: 杂志文章,随机对照试验
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pub_type: 杂志文章,随机对照试验
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journal_title:International journal of sports medicine
pub_type: 临床试验,杂志文章
doi:10.1055/s-2004-830439
更新日期:2005-10-01 00:00:00
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pub_type: 杂志文章,评审
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pub_type: 杂志文章,随机对照试验
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pub_type: 杂志文章,meta分析
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