Exercise Training Increases Metaboreflex Control in Patients with Obstructive Sleep Apnea

Autor(es)

Guerra, Renan S. ^[1] ; Goya, Thiago T. ^[2] ; Silva, Rosyvaldo F. ^[3] ; Lima, Marta F. ^[1] ; Barbosa, Eline R. F. ^[1] ; Alves, Maria Janieire De N. N. ^[1] ; Rodrigues, Amanda G. ^[1] ; Lorenzi-Filho, Geraldo ^[1] ; Negrao, Carlos Eduardo ^{[4, 1]} ; Ueno-Pardi, Linda M. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Med Sch, Heart Inst InCor HCFMUSP, Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Expt Physiopathol, Sao Paulo, SP - Brazil

^[3] Univ Sao Paulo, Sch Arts Sci & Humanities, Sao Paulo, SP - Brazil

^[4] Univ Sao Paulo, Sch Phys Educ & Sport, Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MEDICINE AND SCIENCE IN SPORTS AND EXERCISE; v. 51, n. 3, p. 426-435, MAR 2019.
• Citações Web of Science: 0

Resumo

Introduction/Purpose We demonstrated that patients with obstructive sleep apnea (OSA) have reduced muscle metaboreflex control of muscle sympathetic nerve activity (MSNA). In addition, exercise training increased muscle metaboreflex control in heart failure patients. Objective We tested the hypothesis that exercise training would increase muscle metaboreflex control of MSNA in patients with OSA. Methods Forty-one patients with OSA were randomized into the following two groups: 1) nontrained (OSANT, n = 21) and 2) trained (OSAT, n = 20). Muscle sympathetic nerve activity was assessed by microneurography technique, muscle blood flow (FBF) by venous occlusion plethysmography, heart rate by electrocardiography, and blood pressure with an automated oscillometric device. All physiological variables were simultaneously assessed at rest, during isometric handgrip exercise at 30% of the maximal voluntary contraction, and during posthandgrip muscle ischemia (PHMI). Muscle metaboreflex sensitivity was calculated as the difference in MSNA between PHMI and the rest period. Patients in the OSAT group underwent 72 sessions of moderate exercise training, whereas patients in the OSANT group were clinical follow-up for 6 months. Results The OSANT and OSAT groups were similar in anthropometric, neurovascular, hemodynamic and sleep parameters. Exercise training reduced the baseline MSNA (34 2 bursts per minute vs 25 +/- 2 bursts per minute; P < 0.05) and increased the baseline FBF (2.1 +/- 0.2 mLmin(-1) per 100 g vs 2.4 +/- 0.2 mLmin(-1) per 100 g; P < 0.05). Exercise training significantly reduced MSNA levels and increased FBF responses during isometric exercise. Exercise training significantly increased MSNA responses during PHMI (6.5 +/- 1 vs -1.7 +/- 1 bursts per minute, P < 0.01). No significant changes in FBF or hemodynamic parameters in OSANT patients were found. Conclusions Exercise training increases muscle metaboreflex sensitivity in patients with OSA. This autonomic change associated with increased muscle blood flow may contribute to the increase in exercise performance in this set of patients. (AU)

• Processo FAPESP: 10/15064-6 - Efeitos do treinamento físico na estrutura e metabolismo cerebral, cognição e controle neurovascular em indivíduos com apnéia obstrutiva do sono
• Beneficiário: Linda Massako Ueno Pardi
• Modalidade de apoio: Auxílio à Pesquisa - Regular