scholarly journals Cardiac Autonomic Responses during Exercise and Post-exercise Recovery Using Heart Rate Variability and Systolic Time Intervals—A Review

2017 ◽  
Vol 8 ◽  
Author(s):  
Scott Michael ◽  
Kenneth S. Graham ◽  
Glen M. Davis
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Systolic Time Intervals ◽  
Exercise Recovery ◽  
Time Intervals ◽  
Post Exercise ◽  
Autonomic Responses ◽  
Systolic Time ◽  
Post Exercise Recovery

scholarly journals Is Ultra-Short-Term Heart Rate Variability Valid in Non-static Conditions?

2021 ◽  
Vol 12 ◽  
Author(s):  
Jin Woong Kim ◽  
Hyeon Seok Seok ◽  
Hangsik Shin
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Measurement Time ◽  
Exercise Recovery ◽  
Short Term ◽  
Post Exercise ◽  
Hrv Analysis ◽  
Time Required ◽  
Static Conditions ◽  
Post Exercise Recovery

In mobile healthcare, heart rate variability (HRV) is increasingly being used in dynamic patient states. In this situation, shortening of the measurement time is required. This study aimed to validate ultra-short-term HRV in non-static conditions. We conducted electrocardiogram (ECG) measurements at rest, during exercise, and in the post-exercise recovery period in 30 subjects and analyzed ultra-short-term HRV in time and frequency domains by ECG in 10, 30, 60, 120, 180, and 240-s intervals, and compared the values to the 5-min HRV. For statistical analysis, null hypothesis testing, Cohen’s d statistics, Pearson’s correlation coefficient, and Bland-Altman analysis were used, with a statistical significance level of P < 0.05. The feasibility of ultra-short-term HRV and the minimum time required for analysis showed differences in each condition and for each analysis method. If the strict criteria satisfying all the statistical methods were followed, the ultra-short-term HRV could be derived from a from 30 to 240-s length of ECG. However, at least 120 s was required in the post-exercise recovery or exercise conditions, and even ultra-short-term HRV was not measurable in some variables. In contrast, according to the lenient criteria needed to satisfy only one of the statistical criteria, the minimum time required for ultra-short-term HRV analysis was 10–60 s in the resting condition, 10–180 s in the exercise condition, and 10–120 s in the post-exercise recovery condition. In conclusion, the results of this study showed that a longer measurement time was required for ultra-short-term HRV analysis in dynamic conditions. This suggests that the existing ultra-short-term HRV research results derived from the static condition cannot applied to the non-static conditions of daily life and that a criterion specific to the non-static conditions are necessary.

Circulating Catecholamines and Systolic Time Intervals in Labile and Sustained Hypertension

1978 ◽  
Vol 55 (s4) ◽  
pp. 65s-68s ◽  
Author(s):  
D. Cousineau ◽  
J. de Champlain ◽  
L. Lapointe
Keyword(s):  
Heart Rate ◽  
Essential Hypertension ◽  
Myocardial Contractility ◽  
Systolic Time Intervals ◽  
Normal Range ◽  
Time Intervals ◽  
Hypertensive Patients ◽  
Sustained Hypertension ◽  
Systolic Time ◽  
Hypotensive Response

1. Average supine circulating total catecholamine concentrations were found to be higher than the normal range in about 50% of patients with labile hypertension and in about 30% of patients with sustained essential hypertension. 2. These higher resting concentrations were mainly due to an increase in adrenaline in labile hypertension and to an increase in noradrenaline in sustained hypertension. 3. Patients with elevated catecholamine concentrations were also characterized by a higher heart rate, by an increased myocardial contractility and by greater hypotensive response after treatment with β-adrenoreceptor blocking agents. 4. These studies suggest the existence of subgroups of hypertensive patients with increased sympathetic tone.

The effects of propranolol and verapamil on hyperthyroid heart symptoms and function, assessed by systolic time intervals

1993 ◽  
Vol 128 (4) ◽  
pp. 297-300
Author(s):  
Henrik Nordin ◽  
Anders M Galløe ◽  
Søren D Ladefoged ◽  
Jørn Badskjær
Keyword(s):  
Heart Rate ◽  
Cardiac Contractility ◽  
Systolic Time Intervals ◽  
Chronic Administration ◽  
Normal Subjects ◽  
Metabolic Effects ◽  
Time Intervals ◽  
Systolic Time ◽  
Hyperthyroid Heart ◽  
Hyperthyroid Patients

The effects of acute and chronic administration of propranolol and verapamil on heart rate and systolic time intervals were studied in 10 hyperthyroid patients and 10 normal subjects, both groups without signs of cardiovascular or pulmonary disease. In normal subjects iv propranolol reduced heart rate significantly, and both drugs increased the total electromechanical systole significantly without difference between the drugs. This effect was insignificant when the drugs were given orally. In hyperthyroid patients both drugs reduced heart rate significantly in acute and chronic administration, and no difference between the two drugs was found. Neither drug altered cardiac contractility as assessed by systolic time intervals. These results indicate that the metabolic effects of thyroid hormone on contractility were unaltered and unblocked by the drugs. None of the participants developed signs of heart failure. Verapamil can thus be used as an alternative to propranolol in the treatment of tachycardia in hyperthyroidism.

Heart contractility at pressure loads induced by ischemia of exercised muscle in humans

1982 ◽  
Vol 52 (2) ◽  
pp. 340-345 ◽  
Author(s):  
F. Bonde-Petersen ◽  
Y. Suzuki
Keyword(s):  
Heart Rate ◽  
Blood Flow ◽  
Vascular Tone ◽  
Forearm Blood Flow ◽  
Systolic Time Intervals ◽  
Bicycle Exercise ◽  
Time Intervals ◽  
Control Situation ◽  
Systolic Time ◽  
Heart Contractility

During one- or two-leg bicycle exercise in three subjects the exercised limb(s) were made ischemic by occlusion cuffs inflated to 300 Torr immediately at, or 30 s before, end of 7-min exercise and kept inflated for 3 min of recovery. Mean arterial pressure (MAP) remained elevated during occluded recovery, whereas heart rate (HR) and forearm blood flow tended to recover at the same rate as in the control situation without occlusion. Systolic time intervals (STI) were negatively correlated to HR in the interval 60–120 beats/min. In spite of a variation in afterload of 30 Torr induced by occlusion the correlation between HR and STI fitted the same equations. The involvement of different size of muscle mass did not change these relationships. The elevation of MAP during ischemia of exercised muscles is due to an increased vascular tone reflexly induced from muscle chemoreceptors and not cardiac in origin. The results also demonstrate that heart contractility adapts well to the induced afterload.

scholarly journals Involvement of Cardiorespiratory Capacity on the Acute Effects of Caffeine on Autonomic Recovery

Medicina ◽  
2019 ◽  
Vol 55 (5) ◽  
pp. 196 ◽  
Author(s):  
Luana A. Gonzaga ◽  
Luiz C. M. Vanderlei ◽  
Rayana L. Gomes ◽  
David M. Garner ◽  
Vitor E. Valenti
Keyword(s):  
Heart Rate ◽  
Time Interval ◽  
Exercise Recovery ◽  
Moderate Exercise ◽  
Acute Effects ◽  
Rr Intervals ◽  
Post Exercise ◽  
Adult Men ◽  
Frequency Domains ◽  
Post Exercise Recovery

Background and objectives: As a result of ergogenic properties, caffeine has been increasingly taken prior to physical exercise, yet its effects on post-exercise recovery, considering the differences in the cardiorespiratory capacity of the individuals, has not yet been studied or fully elucidated. Optimizing the post-exercise recovery can convey advantages to physical activity practitioners. We evaluated the acute effects of caffeine on heart rate (HR) autonomic control recovery following moderate aerobic exercise in males with different cardiorespiratory capacities. Materials and Methods: We split young adult men into two groups based on their various oxygen consumption peaks (VO2 peak): (1) Higher VO2 (HO): Sixteen volunteers, peak VO2 > 42.46 mL/kg/min and (2) Low VO2 (LO): Sixteen individuals, VO2 < 42.46 mL/kg/min). The volunteers were submitted to placebo and caffeine protocols, which entailed 300 mg of caffeine or placebo (starch) in capsules, followed by 15 min of rest, 30 min of moderate exercise on a treadmill at 60% of the VO2 peak, followed by 60 min of supine recovery. Heart rate variability (HRV) indexes in the time and frequency domains were examined. Results: Effect of time for RMSSD (square root of the average of the square of the differences between normal adjacent RR intervals) and SDNN (standard deviation of all normal RR intervals recorded in a time interval) was achieved (p < 0.001). Significant adjustments were observed (rest versus recovery) at the 0 to 5th min of recovery from exercise for the LO during the placebo protocol and at the 5th at 10th min of recovery for the caffeine protocol. For the HO in both procedures we found significant alterations only at the 0 to 5th min of recovery. Conclusion: Caffeine delayed parasympathetic recovery from exercise in individuals with lower cardiorespiratory capacity.

Effects of posture on heart rate and systolic time intervals in normal men

1994 ◽  
Vol 73 (5) ◽  
pp. 411-414
Author(s):  
Kazuya Takehana ◽  
Tetsuro Sugiura ◽  
Yo Nagahama ◽  
Tadashi Hasegawa ◽  
Toshiji Iwasaka ◽  
...  
Keyword(s):  
Heart Rate ◽  
Systolic Time Intervals ◽  
Time Intervals ◽  
Systolic Time ◽  
Normal Men
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