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  • 1
    Electronic Resource
    Electronic Resource
    The impact of cardiac activity on triaxially recorded endogenous microvibrations of the body (1980)
    Springer
    European journal of applied physiology 44 (1980), S. 83-96 
    Details
    ISSN: 1439-6327
    Keywords: Microvibrations ; Cardiac activity ; Isoprenaline ; Exercise ; Cold stress ; Muscle tonus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The influence of cardiac activity on the endogenous microvibrations of the body (MV) was studied in a total of 37 young, healthy subjects. The force oscillations and the rectified and integrated force-time function in the three space directions were simultaneously recorded with the ECG and the arterial pulse during quiet bipedal standing before (control) and after isoprenaline inhalation, a work load of 150 W, and mild cold stress. In the vertical force component (Fz) 27 out of the 37 subjects showed cardiac characteristics similar to the ballistocardiogram. After isoprenaline or exercise, all 37 subjects showed these cardiac characteristics in Fz, and the maximal amplitudes as well as the rectified impulse values were increased in the three directions, but particularly in the z-axis. The propagation of the MV through the body was independent of the arterial pulsation. The increase in muscle tone due to cold stress led to a significant increase of the rectified impulse only in the sideward direction (SY). It is concluded that the triaxially recorded MV arise from cardiac activity, mainly reflected in the vertical (z) axis, and from skeletal musculature representing a mechanical oscillating system with varying material constants (muscle tension, inertial forces, etc.).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00421767
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The microvibrations of the body, an index for examination stress (1978)
    Springer
    European journal of applied physiology 39 (1978), S. 99-109 
    Details
    ISSN: 1439-6327
    Keywords: Microvibrations ; Examination stress ; Cardiac output ; Muscle tonus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Changes of whole-body microvibrations (MV) were quantitatively analyzed in 123 voluntary subjects during two examination situations and compared with the results obtained during the ensuing vacation. The force oscillations in the three space directions were measured during quiet bipedal standing and simultaneously recorded as a time function with the rectified and integrated force-time function (= rectified impulse). The rectified impulses related to body weight were used as a measure for the MV. Immediately before the examinations, all the subjects showed high values. These decreased significantly in the control measurement if the subjects passed the exams, but remained relatively high in the subjects who failed. In all three measurements, smokers and candidates who took tranquillizers before the exams show higher MV values than do the other subjects. Females are less tense than males, a difference particularly significant in the vertical (z) direction. The rectified impulse in this direction correlates positively with the estimated cardiac output. Body weight and body length show a positive correlation with the MV values in the horizontal forward-backward (x) and vertical (z) direction. The measurement of the whole-body MV enables quantitative evaluation of the complex load due to an examination situation. The hypothesis that different types of stress or personality affect given directions in space requires further investigation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00421714
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The effect of propranolol on whole-body microvibrations during examination stress (1986)
    Springer
    European journal of applied physiology 55 (1986), S. 307-314 
    Details
    ISSN: 1439-6327
    Keywords: Propranolol ; Microvibrations ; Examination stress ; Cardiac activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Whole-body microvibrations (MV) in three dimensions were measured in 51 volunteers, all medical students, 26 without and 25 with beta-receptor blockade (propranolol), immediately before a practical physiology examination and during the ensuing vacation. Propranolol impeded the increase in MV values in all three axes, significantly those in the z axis (vertical), the differences in MV values between the two measurements being minimal in the beta-receptor blocked group. On the other hand, propranolol enhanced MV in the x axis (anteroposterior) and the y axis (transverse), the y axis difference being significant only in females. Propranolol obviously relieves examination stress: the majority of candidates (52%) felt “quieter≓ in the examination with than in other similar situations without beta-receptor blockade. Propranolol was, however, without effect on the examination results. The rectified impulse in the z axis when related to body weight (Jz) correlates linearly with the calculated cardiac output. Propranolol, however, reduced cardiac output more than Jz, pointing to a Jz component non-sensitive to beta-receptor blockade. The part played by muscle tonus, mainly reflected in the y axis, thus remains unknown. The large and slow oscillations in the x and y axes, observed particularly in beta-receptor blocked females, might be attributed to diminution in standing ability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02343804
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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