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Biomedical subjects

F Heydenreich

Publications and source records attributed to F Heydenreich.

26 records · Page 2Linked to original sources
PubMed1978

[Quantitative analysis of the electromyogram using triggered correlation].

A study has been made to determine the usefulness of triggered correlation as a method of automatic quantitative analysis of graphic representations of the somatic electric currents associated with muscular action. Although an electromyogram is neither a normally distributed nor a stationary random process, the method has been found to be suitable for clinical electromyography. The method is easy to use, with measuring values that may be used for diagnostic purposes being obtained within a few seconds. In the case of normal subjects and patients with neuromuscular diseases, parameters of triggered correlograms are compared with those of visuamanually analyzed or digitally averaged potentials of individual motor units.

Electromyography↗
PubMed1976

[Changes depend on age in electromyogram -- studies about parameter of motor unit action potentials in normal subjects of different age (author's transl)].

In normal subjects of different age groups electromyographically several muscles were examined. The motor unit action potentials were registered and parameters of those were evaluated manually and digitally. For all examined muscles was found an increase in the duration of potentials with the age. The increase was greatest in the younger and older age groups. An interpretation of these findings is given.

Action Potentials↗
PubMed1975

[Parameters of digitally averaged potentials of individual motor units].

Of sixty normal subjects of different age six different muscles each were examined electromyographically. The activity pattern was recorded for moderate voluntary innervation and superposed digitally. The parameters of digitally averaged summation action potentials were compared with those of manually assessed potentials. The two methods gave identical results: The duration of potentials was between 5 and 10 ms. It increased in the younger and older age groups and showed only slight changes in middle-aged persons. Only minor differences were found between the muscles of one age group, an exception being the orbicularis oris muscle. The results obtained are compared with values reported in the literature.

Action Potentials↗
PubMedDate not supplied

Heart rate fluctuations in diabetic patients with cardiac vagal dysfunction: a spectral analysis.

The autonomic nervous control of cardiac function during active orthostatic load has been studied by measuring the power spectrum of heart rate fluctuations in 16 insulin-dependent diabetic patients and 14 age-matched control subjects. The patients were subdivided into two groups: 8 with normal respiratory sinus dysrhythmia (RSA+) and 8 with reduced respiratory sinus dysrhythmia (RSA-). In RSA- patients the total power (0.01-0.50 Hz) was significantly reduced compared with control subjects (4.7 versus 15.5 min-2, 2p less than 0.05) and the pattern of heart rate fluctuations was characterized by a relative increase in the low-frequency component (0.01-0.05 Hz) as compared with RSA+ patients and control subjects (45% versus 24% and 27%, both 2p less than 0.01). There was also a significant reduction in the high-frequency component (0.15-0.50 Hz) as compared with RSA+ patients and control subjects (17% versus 36% and 33%, both 2p less than 0.05). During standing, a significant increase in total power was found only in control subjects (2p less than 0.01) and the difference between control subjects, and RSA+ and RSA- patients reached significance (32.2 versus 15.1 and 12.7 min-2, 2p less than 0.02 and 2p less than 0.01). The pattern of heart rate fluctuations in RSA- patients showed no significant change on standing. These results suggest that the reduced overall heart rate variability in diabetic patients with cardiac autonomic neuropathy is associated with a typical heart rate fluctuation pattern.

Adult↗