Variabilidade da frequência cardíaca e carga máxima atingida no teste de esforço físico dinâmico em homens idosos

Abstract

Introduction: One of the benefits provided by regular physical activities seems to be the improvement of cardiac autonomic nervous system modulation. However, the role of physical activity as a determinant factor of the heart rate variability (HRV) is not well-established. Therefore, the aim of this study was to verify whether there was a correlation between resting heart rate and maximum workload reached in an exercise test with HRV indices in elderly men. Methods: A study was carried out with 18 elderly men between the ages of 60 and 70 years. The following evaluations were made: a) Maximal exercise test on a cycle ergometer using Balke treadmill protocol to evaluate the aerobic capacity; b) Heart Rate (HR) and RR Intervals (RRi) registered for 15 minutes at rest, in the supine position. After collection, data were analyzed by time domain (RMSSD index) and by the frequency domain (low (LF) and high (HF) frequency indices and LF/HF ratio). Pearson correlation test was used to verify whether there was a correlation between the maximum workload reached during the exercise test and the HRV indices (p ≤ 0.05). Results: Demographic, physiological, and anthropometric characteristics and the maximum load achieved during exercise test: Age = 63 ± 3.0 years; BMI = 24 ± 2 kg/m2; HR = 63 ± 9 bpm; SBP = 123 ± 19 mmHg; DBP = 83 ± 8 mmHg; maximum workload = 152 ± 29 watts. No correlation was found between the HRV indices with the values of the resting heart rate and the maximum workload reached in the exercise test (p > 0.05). Conclusion: Temporal and spectral indices of heart rate variability are not indicators of aerobic capacity of elderly men evaluated on a cycle ergometer.

Comportamento da variabilidade da frequência cardíaca em teste com cargas progressivas

“…Faltando dez segundos para uma nova carga, as voluntárias informaram, mediante uma Escala de Borg, sua PSE. A metodologia utilizada se baseou no teste de Conconi que é amplamente usado em pesquisas com indivíduos saudáveis e também com doenças cardiovasculares 5 o teste com cargas progressivas da velocidade 5km/h até a velocidade de 14km/h quando esta foi alcançada pelas participantes. Observa-se uma queda na VFC mais acentuada nas velocidades iniciais do teste entre 5km/h para 6km/h e assim consecutivamente até que se alcançou a velocidade de 10km/h.…”

Modulação Autonômica Da Frequência Cardíaca E Capacidade Funcional Aeróbica Em Hemiparéticos

“…Esses resultados parecem contraditórios, contudo, estes achados se assemelham ao estudo de Vieira et al 32 que avaliaram a correlação entre a capacidade aeróbica e o controle autonômico em idosos sedentários e praticantes de atividade física, e não encontraram relação. Os autores atribuem estes resultados aos fatores que influenciam, de forma diferente, as variáveis em estudo.…”

Influence of neural mobilization in the sympathetic slump position on the behavior of the autonomic nervous system

“…The measurement of HRV is a noninvasive technique used to investigate ANS functioning related to sympathovagal balance (Borell et al, 2007;Casonatto et al, 2011;Vieira et al, 2012). The measurement of HRV can be done mainly in time and frequency domain (spectral analysis), of which the frequency domain is more frequently chosen to assess ANS functioning in individuals at rest (Corazza et al, 2014;Hodges et al, 2018;Kawaguchi et al, 2007;Vanderlei et al, 2009;Vieira et al, 2012;Rassi, 2018;Wazen et al, 2018).…”

“…The measurement of HRV is a noninvasive technique used to investigate ANS functioning related to sympathovagal balance (Borell et al, 2007;Casonatto et al, 2011;Vieira et al, 2012). The measurement of HRV can be done mainly in time and frequency domain (spectral analysis), of which the frequency domain is more frequently chosen to assess ANS functioning in individuals at rest (Corazza et al, 2014;Hodges et al, 2018;Kawaguchi et al, 2007;Vanderlei et al, 2009;Vieira et al, 2012;Rassi, 2018;Wazen et al, 2018). The HRV is based on three spectral components: high frequency (HF) -ranging from 0.15 to 0.4 Hz, which corresponds to the respiratory modulation and indicates the performance of the vagus (parasympathetic) nerve on the heart rate; low frequency (LF) -ranging from 0.04 to 0.15 Hz, the result of the vagus nerve and sympathetic action on the heart, with sympathetic predominance; very low frequency (VLF) -ranging from 0.003 to 0.04 Hz, less frequently used rates whose physiological explanation is not well established and the LF/HF ratio that characterizes the cardiac sympathetic-vagal balance (Borell et al, 2007;Chua et al, 2008;Goldstein et al, 2011;Grassi et al, 2012;Malliani, 1999;McCraty and Shaffer, 2015;Task…, 1996;Vanderlei et al, 2009).…”