R. W. Gülch

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Action potentials were measured in hypertrophied rat myocardium by means of glass microelectrodes. Left ventricular hypertrophy was induced by experimental chronic coarctation of one renal artery without contralateral nephrectomy. The action potentials of the hypertrophied myocardium exhibit a marked prolongation without any significant changes in the(More)
  • R W Gülch
  • International journal of sports medicine
  • 1994
Based on the physiological principles of the muscular force-velocity concept, this paper deals with the special problems associated with determining and interpreting force-velocity relations of muscles in situ particularly in humans. In the strict sense, instead of force-velocity relations merely torque-angular velocity relations of a joint can be measured(More)
Although it is generally accepted that ventricular geometric configuration plays an important role for manifestation of cardiac pumping failure, the relative significance of structural dilatation vs impaired myocardial performance – and the interaction of these factors – have not been thoroughly addressed. Besides its unfavorable effects on coronary(More)
The effects of an 8-week unilateral contract-relax (CR) stretching training program (passive stretch after isometric contraction) on muscular performance were investigated in a group of 16 athletes. The flexibility, maximum torque and angular position as well as contraction work in movements of the knee joint were determined before training and after 4 and(More)
An intermittent swimming training of 40 rats for eight weeks resulted in an increase of 17% in heart weight, which is regarded as an index for the degree of hypertrophy. Measurement of left ventricular pressure and volume in the isovolumetrically beating and the arrested heart of open chest rats gave the following results of the trained rats, as compared(More)
Length-tension diagrams and force-velocity relations of isolated cat papillary muscles were measured under strictly stationary conditions: any analysis of isometric mechanograms was carried out only in stable isometric beats; each measurement in beats under any condition different from the isometric one was determined in the very first contraction after a(More)
On the basis of theoretical considerations and experimental data this study deals with the functional consequences of structural dilatation, particularly in view of Linzbach's concept of chronic heart failure (34-38). After a short review of the literature, a theoretical analysis of the relationship between stroke volume and ventricular inner radius is(More)
On the basis of two different models of damped release experiments, the passive component of the all-over shortening velocity throughout an abrupt unloading of cardiac muscle is calculated by treating the muscle functionally as a non-linear spring. It can be shown that: 1. in a time range where normally data for constructing force-velocity relations are(More)
A methodological approach based on Frank's pressure-volume (P-V) diagram and model calculations for analyzing the determinants of stroke volume (SV) under conditions of altered ventricular geometrical configuration is discussed with respect to the underlying geometrical models. The approach is generalized in the sense that alterations in myocardial(More)
In the isotonically beating cat papillary muscle, a sudden augmentation of the preload initiates a visco-elastic strain retardation, in the course of which the preparations show a marked increase in their isotonic mechanogram amplitudes. It is preceded in the first seconds by a short-term decline. These effects correspond well with the phenomena of stress(More)