Firefighters' basal cardiac autonomic function and its associations with cardiorespiratory fitness.

Autor:	Fontana, Keila E., Porto, Luiz Guilherme G., Molina, Guilherme E., Nogueira, Rosenkranz Maciel, Kales, Stefanos N., Korre, Maria, Schmidt, Ana Clara Bernardes, de Souza, Jessica Maximo, Smith, Denise L., Junqueira, Luiz Fernando
Předmět:	AUTONOMIC nervous system physiology ANTHROPOMETRY BLOOD pressure BLOOD pressure measurement CARDIOVASCULAR system physiology ELECTROCARDIOGRAPHY EXERCISE physiology FIRE fighters HEART beat HYPERTENSION PARASYMPATHETIC nervous system PATIENT positioning POSTURE QUESTIONNAIRES RESEARCH funding STATISTICAL sampling SELF-evaluation STATISTICAL hypothesis testing STATISTICS SUPINE position DATA analysis BODY movement BODY mass index OXYGEN consumption CROSS-sectional method CASE-control method PHYSICAL activity DATA analysis software STATISTICAL models DESCRIPTIVE statistics CARDIOPULMONARY fitness MANN Whitney U Test
Zdroj:	Work; 2019, Vol. 62 Issue 3, p485-495, 11p, 4 Charts, 2 Graphs
Abstrakt:	BACKGROUND: Firefighters' activities require constant adjustments of the cardiovascular system with cardiac autonomic function (CAF) playing an important role. Despite the crucial role of CAF in regulating stress response, little is known about firefighters' CAF. OBJECTIVE: We aimed to characterize the resting on-duty and off-duty CAF of male firefighters, in association with cardiorespiratory fitness (CRF). METHODS: We evaluated 38 firefighters in an on-duty rest condition and 26 firefighters in an off-duty laboratory-controlled condition. CAF was addressed by means of heart rate variability (HRV). We compared HRV measurements between CRF categories (<12METs vs ≥12METs). Wilcoxon, Mann-Whitney texts and Spearman correlation were used and General Linear Model was applied for age and BMI adjustments. RESULTS: Firefighters' resting CAF is characterized by a predominant sympathetic modulation and a large inter-individual dispersion in all HRV indices, in both groups. We found a positive correlation between a higher CRF, the overall CAF and the higher parasympathetic activity (p < 0,03). Firefighters with CRF ≥12 METs showed a higher parasympathetic modulation. CONCLUSIONS: Firefighters' resting CAF is characterized by a predominant sympathetic modulation and a large inter-individual dispersion in all HRV indices, in both groups. Our results support mandatory physical training focused in improving firefighters' CAF as a cardiopretective effect. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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