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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Sport Modality Affects Bradycardia Level and Its Mechanisms of Control in Professional Athletes

Texto completo
Autor(es):
Azevedo, L. F. [1] ; Perlingeiro, P. S. [1] ; Hachul, D. T. [2] ; Gomes-Santos, I. L. [1] ; Brum, P. C. [3] ; Allison, T. G. [4] ; Negrao, C. E. [1, 3] ; De Matos, L. D. N. J. [1, 5]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Sch Med, Heart Inst InCor, Cardiovasc Rehabil & Exercise Physiol Unit, BR-05403900 Sao Paulo - Brazil
[2] Univ Sao Paulo, Sch Med, Heart Inst InCor, Clin Arrhythmia Unit, BR-05403900 Sao Paulo - Brazil
[3] Univ Sao Paulo, Sch Phys Educ & Sport, Heart Inst InCor, BR-05403900 Sao Paulo - Brazil
[4] Mayo Clin, Div Cardiovasc Dis & Internal Med, Rochester, MN - USA
[5] Hosp Israelita Albert Einstein, Rehabil Ctr, Sao Paulo - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: INTERNATIONAL JOURNAL OF SPORTS MEDICINE; v. 35, n. 11, p. 954-959, OCT 2014.
Citações Web of Science: 11
Resumo

We investigated the influence of sport modalities in resting bradycardia and its mechanisms of control in highly trained athletes. In addition, the relationships between bradycardia mechanisms and cardiac structural adaptations were tested. Professional male athletes (13 runners, 11 cyclists) were evaluated. Heart rate (HR) was recorded at rest on beat-to-beat basis (ECG). Selective pharmacological blockade was performed with atropine and esmolol. Vagal effect, intrinsic heart rate (IHR), parasympathetic (n) and sympathetic (m) modulations, autonomic influence (AI) and autonomic balance (Abal) were calculated. Plasmatic norepinephrine (high-pressure liquid chromatography) and cardiac structural adaptations (echocardiography) were evaluated. Runners presented lower resting HR, higher vagal effect, parasympathetic modulation (n), AI and IHR than cyclists (P < 0.05). Abal, sympathetic modulation (m) and norepinephrine level were similar within athletes regardless of modality. The cardiac chambers were also similar between runners and cyclists (P = 0.30). However, cyclists displayed higher septum and posterior wall thickness than runners (P = 0.04). Further analysis showed a trend towards inverse correlation between IHR with septum wall thickness and posterior wall thickness (P = 0.056). Type of sport influences the resting bradycardia level and its mechanisms of control in professional athletes. Resting bradycardia in runners is mainly dependent on an autonomic mechanism. In contrast, a cyclist's resting bradycardia relies on a non-autonomic mechanism probably associated with combined eccentric and concentric hypertrophy. (AU)

Processo FAPESP: 09/08912-3 - Adaptações autonômicas e cardiovasculares em atletas de alto rendimento: influência da modalidade e periodização do treinamento físico
Beneficiário:Luciene Ferreira Azevedo
Modalidade de apoio: Bolsas no Brasil - Doutorado
Processo FAPESP: 06/56613-7 - Adaptacoes autonomicas e cardiovasculares em atletas de alto rendimento: influencia da modalidade e periodizacao do treinamento fisico.
Beneficiário:Luciana Diniz Nagem Janot de Matos
Modalidade de apoio: Auxílio à Pesquisa - Regular