The trigonometric regressive spectral analysis—a method for mapping of beat-to-beat recorded cardiovascular parameters on to frequency domain in comparison with Fourier transformation

Rüdiger, Heinz; Klinghammer, Lutz; Scheuch, K

doi:10.1016/s0169-2607(98)00070-4

Cited by 56 publications

(60 citation statements)

References 17 publications

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“…Spectral analyses of HRV were performed with the newly developed TRS-technique. 17 It has already proved to be a valuable diagnostic instrument for detecting disturbed sympathovagal balance. For example, baroreflex sensitivity can be derived directly on the basis of physiological rhythmical TRS-oscillations.…”

Section: Discussionmentioning

confidence: 99%

“…The spectral analyses were performed with the TRSsoftware 17 and the statistical analyses using SPSS (version 10). Comparisons between the groups were performed using the independent-samples t-test (significance Po0.05).…”

Section: Softwarementioning

confidence: 99%

“…Recently, distinct restrictions have been shown especially for FFT. 16,17 As a promising alternative, the trigonometric regressive spectral analysis (TRS) technique has been developed within the last few years. 17 Respiratory influence on the regulatory behaviour is often taken into account by holding the breathing rhythm constant (metronomic respiration).…”

Section: Introductionmentioning

confidence: 99%

“…16,17 As a promising alternative, the trigonometric regressive spectral analysis (TRS) technique has been developed within the last few years. 17 Respiratory influence on the regulatory behaviour is often taken into account by holding the breathing rhythm constant (metronomic respiration). 18 This controlled breathing has the disadvantage of autonomic control of the heart adapting to it.…”

Section: Introductionmentioning

confidence: 99%

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Sympathetic and parasympathetic activation in heart rate variability in male hypertensive patients under mental stress

Ruediger¹,

Seibt²,

Scheuch³

et al. 2004

J Hum Hypertens

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Disturbed sympathetic and also parasympathetic activity of the autonomic nervous system points to pathological alterations in the cardiovascular system. Untreated hypertensive subjects were examined with respect to the question of whether an increase in sympathetic activity necessarily goes along with a reduction in parasympathetic activity, and whether 'delayed' recovery behaviour after mental stress could be an indicator of a disturbed cardiovascular function. In 20 male hypertensive (HT) and 20 normotensive (NT) subjects (control group), heart rate variability (HRV) was compared during rest and under mental stress. The testing procedure consisted of the following phases: habituation, arithmetic tasks without and with interference, recovery. HRV was analysed using the trigonometric regressive spectral analysis (TRS). Proceeding from the total variance (ms 2 ), the weighted averaged frequency (Hz) and the variance parts (ms 2 ) in the frequency bands 'low frequency' (LF-band: 0.04-0.15 Hz) and 'high frequency' (HF-band: 0.15-0.40 Hz) were explored. The variance part modulated by spontaneous breathing within the HF-band was assessed additionally. The variance part in the LF-band under mental stress was significantly increased in the HT group (Po0.01). Activity in the HF-band (without the respiration-dependent part) under mental stress did not differ between both groups, whereas the breathing-modulated part of variance in the HF-band was reduced in the HT subjects. During the recovery period in the HT group, the weighted averaged frequency was still elevated compared to baseline, and the variance part in the LF-band was increased, which may point to delayed recovery behaviour. In addition, by using a discriminant analysis 85% of all subjects were reclassified to the original groups, all HT subjects being assigned 'correctly'. Spectral variance parameters enable early discovery of altered cardiovascular regulation. Respiration influences variance in the HF-band in hypertensive subjects and should therefore be paid attention to. The variance part in the LF-band, weighted averaged frequency and the respiration-modulated variance in the HF-band turned out to be the most valid parameters for the differentiation between NT and HT subjects.

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Section: Discussionmentioning

confidence: 99%

Section: Softwarementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sympathetic and parasympathetic activation in heart rate variability in male hypertensive patients under mental stress

Ruediger¹,

Seibt²,

Scheuch³

et al. 2004

J Hum Hypertens

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“…The ratio of the amplitudes of lf-to-hf fluctuations in PI are considered to reflect cardiac sympathovagal balance (Task Force of the European Society of Cardiology and the North American Society of Pacing and Electrophysiology, 1996;Kuo et al, 1999). From beat-to-beat values of SBP and PI, BRS was derived using trigonometric regressive spectral analysis (Ruediger et al, 1999). This technique compares very well with other established techniques that also derive BRS from beat-to-beat changes in blood pressure and HR (Laude et al, 2004) and has the advantage that it allows the measurement of varying lengths of data (Ruediger et al, 1999(Ruediger et al, , 2004.…”

Section: Blood Pressure Acquisitionmentioning

confidence: 99%

Acute autonomic effects of vitamins and fats in male smokers

Wright

Ruediger²,

Kroner

et al. 2007

Eur J Clin Nutr

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Background/Objectives: Vitamins can help improve cardiovascular control. In contrast, smoking works in the opposite fashion, reducing the baroreflex control of heart rate (HR) possibly via oxidative stress. High-fat challenges also impair cardiovascular regulation. Whether vitamins have acute beneficial effects on the baroreflex control of HR in smokers is unclear. Subjects/Methods: A randomized, placebo-controlled crossover study in 30 male smokers (34.276.9 years). Interventions were: (1) moderate (vitamin C (300 mg) and E (75 IU) and folic acid (1 mg)); (2) high doses of vitamins (vitamin C (2 g) and E (800 IU), and folic acid (5 mg)); or, (3) placebo. Vitamins were ingested with cream (a high-fat challenge) or milk (low-fat control). Four hours later, blood was withdrawn and radial pulse wave forms recorded via tonometry. Spontaneous beat-to-beat variations in HR and systolic blood pressure (SBP) were analysed by spectral analysis techniques and sympathovagal control of HR and baroreflex sensitivity (BRS) were assessed. Results: High doses of vitamins increased plasma vitamin C, E and folic acid levels (Po0.05) with no change in SBP, HR or BRS (P40.05, analysis of variance). Plasma vitamin levels did not correlate with any cardiovascular parameters. Moderate vitamins increased the vagal control of HR ( þ 23%; Po0.05) and cream led to small increases (Po0.05) in SBP ( þ 2 mm Hg) and HR ( þ 2 beats min À1 ) with no change in BRS. Conclusions: In male smokers, circulating antioxidants had no effect on BRS and minor effects on the cardiovascular system were seen following acute fat and vitamin ingestion.

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Baroreflex sensitivity and power spectral analysis during autonomic testing in different extrapyramidal syndromes

et al. 2010

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Autonomic dysfunction has been frequently demonstrated in patients with extrapyramidal diseases by cardiovascular autonomic testing. In addition to classical testing, we applied the more detailed baroreflex and spectral analysis on three traditional cardiovascular tests in this study to get additional information on autonomic outflow. We recorded continuously blood pressure, electrocardiogram, and respiration in 35 patients with multiple system atrophy, 32 patients with progressive supranuclear palsy, 46 patients with idiopathic Parkinson's disease and in 27 corresponding healthy subjects during cardiovascular autonomic testing (metronomic breathing, Valsalva manoeuvre, head-up tilt). Baroreflex and spectral analyses were performed by using trigonometric regressive spectral analysis between and during the manoeuvres. Consistent with previous interpretations, our data showed an increase of sympathetic activity in head-up tilt and Valsalva test in healthy controls. This sympathetic activity was significantly decreased in patients with typical and atypical Parkinson syndromes. Significant modulation of baroreflex activity could be observed especially during metronomic breathing; again it was significantly lower in all patient groups. Baroreflex and spectral parameters could not only differentiate between patients and healthy controls, but also differentiate between clinically symptomatic (with autonomic dysfunction as eg. orthostatic hypotension) and asymptomatic patients. In conclusion, our approach allows the evaluation of autonomic variability during short and nonstationary periods of time and may constitute a useful advance in the assessment of autonomic function in both physiological and pathological conditions.

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The trigonometric regressive spectral analysis—a method for mapping of beat-to-beat recorded cardiovascular parameters on to frequency domain in comparison with Fourier transformation

Cited by 56 publications

References 17 publications

Sympathetic and parasympathetic activation in heart rate variability in male hypertensive patients under mental stress

Sympathetic and parasympathetic activation in heart rate variability in male hypertensive patients under mental stress

Acute autonomic effects of vitamins and fats in male smokers

Baroreflex sensitivity and power spectral analysis during autonomic testing in different extrapyramidal syndromes

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