2005
DOI: 10.1590/s0100-879x2005000900007 View full text |Buy / Rent full text
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Abstract: The effects of the aging process and an active life-style on the autonomic control of heart rate (HR) were investigated in nine young sedentary (YS, 23 ± 2.4 years), 16 young active (YA, 22 ± 2.1 years), 8 older sedentary (OS, 63 ± 2.4 years) and 8 older active (OA, 61 ± 1.1 years) healthy men. Electrocardiogram was continuously recorded for 15 min at rest and for 4 min in the deep breathing test, with a breath rate of 5 to 6 cycles/min in the supine position. Resting HR and RR intervals were analyzed by time … Show more

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“…It was hypothesized that, although night-time activity may be 'complex' for all subjects, the results would be less complex for normal sleepers, with high levels of 1/f-scaling possibly being a sign of too much activity in the underlying regulatory systems resulting in night-time arousals. This hypothesis, although contrary to most literature surrounding complexity studies in physiological health [14][15][16][17][19][20][21][22], was indeed found to be true for this investigation into sleep actigraphy.…”
Section: Discussioncontrasting
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rupbmjkragerfmgwileyiopcupepmcmbcthiemesagefrontiersapsiucrarxivemeralduhksmucshluniversity-of-gavle
“…It was hypothesized that, although night-time activity may be 'complex' for all subjects, the results would be less complex for normal sleepers, with high levels of 1/f-scaling possibly being a sign of too much activity in the underlying regulatory systems resulting in night-time arousals. This hypothesis, although contrary to most literature surrounding complexity studies in physiological health [14][15][16][17][19][20][21][22], was indeed found to be true for this investigation into sleep actigraphy.…”
Section: Discussioncontrasting
“…4,8,[10][11][12][13]15,17,18,[19][20][21]25,27,[30][31][32][34][35][36]38,39,45,47 The results of 10 articles on ANS response measured during exercise are shown in Table I. Some authors expressed concern about the measurement of spectral analysis of HRV during exercise, while others reported increases (↑), decreases (↓) and no changes in variability indicators (↔) of sympathetic (SNS) and parasympathetic (PNS) influence.…”
Section: Resultsmentioning
“…These findings are in agreement with those reported in [18,57,58] and can be explained by the reduced effect of the change of posture on the cardiovascular variables with age. The progressively limited influence of the orthostatic challenge has been attributed to the impairment of beta-adrenergic receptor stimulation [7,31], reduced efficiency of post-synaptic-adrenergic signaling [52], reduced vagal autonomic modulation to the sinus node [3,[5][6][7][8][9]59], reduced sympathetic modulation to the vessels [48], and decreased baroreflex efficiency [48,58,60].…”
Section: Individual Changes In the Complexity Of Hp And Sap Variabilimentioning
“…These changes are mirrored by a reduction in heart period (HP) variability [2][3][4][5][6][7][8][9], by an increase of systolic blood pressure (SAP) variability [10][11][12], and by a reduction in complexity of physiological dynamics [2][3][4][13][14][15][16][17][18][19][20][21][22][23]. Although the abovementioned studies indicate that aging reduces the complexity of the cardiovascular control and prove the gender dependence, it is still unclear whether the complexity reduction and the gender relation are similarly observable from HP and SAP variabilities and if it persists during a cardiovascular control challenge.…”
Section: Introductionmentioning