Acute Effect of Resistance Exercise Intensity in Cardiac Autonomic Modulation After Exercise

作者：de Andrade Lima Aluisio Henrique Rodrigues; de Moraes Forjaz Claudia Lucia; de Moraes Silva Gleyson Queiroz; Meneses Annelise Lins; Melo Rodrigues Silva Anderson Jose; Ritti Dias Raphael Mendes^*

来源：Arquivos Brasileiros de Cardiologia, 2011, 96(6): 498-503.

• Exercise
• physical exertion
• autonomic nervous system
• sympathetic nervous system

Background: Cardiac sympathovagal balance is altered after resistance exercise. However, the impact of the characteristics of resistance training in this response remains unclear.
Objective: Analyze the acute effect of resistance exercise intensity for trunk and upper limbs in cardiac autonomic modulation after exercise.
Methods: Fifteen young men performed three experimental sessions in random order: control (C), resistance exercise with 50% of 1-RM (E50%) and resistance exercise with 70% of 1-RM (E70%). The sessions included 05 exercises for the trunk and upper limbs performed in three sets of 12, 9 and 6 repetitions, respectively. Before and at 20 and 50 minutes after the interventions, the heart rate was measured for spectral analysis of variability.
Results: In comparison to the values before the intervention, the RR interval and the band of high frequency (HF) increased (major changes: + 112 +/- 83 ms; + 10 +/- 11 un, respectively, p < 0.01), while the low frequency band (LF) and LF/HF ratio decreased (major changes: -10 +/- 11 pc; -2 +/- 2, respectively, p < 0.01) after the session C. None of these variables changed significantly after the E50% session (p > 0.05). Compared to pre-exercise values, the RR interval and the HF band decreased (major changes: -69 +/- 105 ms; -13 +/- 14 un, respectively, p < 0.01), while the LF band and the LF/HF ratio increased (major changes: -13 +/- 14 un, 13 +/- 3 14 +/- 3 and un, respectively, p < 0.01) after E70%.
Conclusion: The higher intensity of resistance exercise for trunk and upper limbs promoted, in an acute manner, greater increase in cardiac sympathovagal balance after exercise. (Arq Bras Cardiol. 2011; [online]. ahead print, PP.0-0)

• 出版日期2011-6