Redução da variabilidade da freqüência cardíaca em indivíduos de meia-idade e o efeito do treinamento de força

Abstract

Objective: To investigate autonomic modulation of the sinus node, by analyzing heart rate variability (HRV) among young and middle-aged individuals, and to assess the effect of an resistance strength training program on this modulation among middleaged individuals. Method: Thirty-two healthy nonsmoking men with sedentary lifestyles, of whom 10 were young (22.2 ± 1.5 years) and 22 were middle-aged (49.3 ± 5.3 years), underwent electrocardiogram signal acquisition for time-domain HRV analysis. The middle-aged individuals were divided into two groups: experimental (n= 12) and control (n= 10). The individuals in the experimental group were enrolled in a strength training program lasting three months. The data analysis was carried out using the Wilcoxon and Mann-Whitney tests (p< 0.05). Results: The middle-aged group presented significant reductions (in relation to the young group) for all the variables used in investigating HRV (SDNN= 33.4 vs. 49.7 ms; RMSSD= 29.9 vs. 49.5 ms; pNN50= 6.5 vs. 27%). The training caused a significant increase in muscle strength and resistance for all muscular groups and non-significant increases in the variables SDNN (33.4 vs. 37.6 ms), RMSSD (30.2 vs. 31.3 ms) and pNN50 (7.5 vs. 11.4%). Conclusions: The findings from this study confirm that increased age causes alteration to the autonomic modulation of the sinus node, as demonstrated by reduced HRV in middle-aged individuals, which was not significantly modified by the type of physical training studied.

Qi Gong and Heart Rate Variability: A Systematic Review

“…Lopes et al, (2007) [14] found in their study that strength training can improve HRV, especially in young people, but that was not seen in the elderly, since variability declines with the physiological process of aging because of depletion of the vagal tonus, increase in the sympathetic activity and the presence of diseases such as hypertension or heart failure.…”

Noções básicas de variabilidade da frequência cardíaca e sua aplicabilidade clínica

“…Moreover, these indexes also allow verification of the influence of factors such as age [4,7,37,79,80], gender [81][82][83] and exercise [17][18][19]29,38] on the autonomic control. Table 2 shows studies using HRV in various physiological and pathological conditions.…”

“…Table 2 shows studies using HRV in various physiological and pathological conditions. Carnethon et al [56] Novais et al [29] Menezes et al [60] Terathongkum et al [61] Takahashi et al [55] Bittencourt et al [26] Pecyna [63] Carney et al [54] Limongelli et al [58] Karas et al [59] Larosa et al [62] Javorka et al [38] Catai et al [7] Weerapong et al [41] Mello et al [37] Paschoal et al [72] Sin DD et al [66] Kudaiberdieva et al [65] Lopes et al [71] Neves et al [73] Furuland et al [68] Lopes et al [79] and Paschoal et al [80] observed that the aging process causes a depletion of vagal tone and consequent increase in sympathetic activity, therefore older individuals have a lower HRV. In 2006, Rajendra Acharya et al [4] observed that HRV is lower with age and the variation is greater in women.…”

Efeitos agudos do tabagismo sobre a modulação autonômica: análise por meio do plot de poincaré

“…In the TD, the RMSSD index, which corresponds to the root mean square of the difference between successive normal adjacent R-R intervals, expressed in milliseconds (ms) 27 and the SDNN index, which corresponds to the standard deviation of all normal sinus R-R intervals, expressed in ms 16 , were used.…”