HEART AUTONOMIC CONTROL DURING STATIC SUBMAXIMAL CONTRACTIONS: INFLUENCE OF TASK FEATURES

Author:

Passos Rafael S.12,Cerqueira Mikhail S.13,Oliveira Alinne A.14,Rocha José A. S.1,Andrade Helder B.1,Pirôpo Uanderson S.12,Borges Lucio S.1,Costa Silvania Moraes12,Pithon Karla R.4,Pereira Rafael12

Affiliation:

1. Neuromuscular Physiology Research Group, Biological Sciences Department, Universidade Estadual do Sudoeste da Bahia, Rua José Moreira Sobrinho, s/n, Jequiezinho, Jequie, Bahia, Brazil

2. Postgraduate Program in Nursing and Health, Universidade Estadual do Sudoeste da Bahia, Jequie, Bahia, Brazil

3. Department of Physical Therapy, Universidade Federal do Rio Grande do Norte, Natal, Brazil

4. Health Department, Universidade Estadual do Sudoeste da Bahia, Jequie, Bahia, Brazil

Abstract

Background: Isometric exercise is important to cardiac rehabilitation, but understanding how different tasks can interfere with the Heart Rate Variability (HRV) still needs some clarification. Objective: To compare the Autonomic Nervous System (ANS) behavior during submaximal isometric tasks involving different muscle groups. Methods: Six healthy males ([Formula: see text] years old) performed two submaximal isometric tasks (30%) of knee extension and handgrip, sustained for 3[Formula: see text]min each, using visual feedback to maintain force levels. Successive RR intervals were recorded along the task, as well as for 5[Formula: see text]min before the task. Linear and nonlinear methods were used to obtain HRV parameters from successive RR intervals. Student [Formula: see text] test was used to compare the data with significant level set as [Formula: see text]. Results: Time domain parameters as well as the nonlinear parameters were significantly higher during the handgrip task. Conclusions: Submaximal isometric handgrip task is associated with a lower vagal withdrawal, when compared to submaximal isometric knee extension, suggesting that handgrip task promotes greater cardioprotection during exercise, while the isometric knee extension task could induce better adaptations to training.

Funder

FAPESB

Publisher

World Scientific Pub Co Pte Lt

Subject

Orthopedics and Sports Medicine

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