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It has been claimed that an increase in the 0.1-Hz component in power spectra of heart rate variability indicates an increased sympathetic tone. We tested 135 middle-aged unmedicated men (mean age 44 +/- 7 years) with two types of mental tasks, a reaction-time test and a mental arithmetic test, to determine whether the results were comparable with those from tilt tests. Although both tasks significantly increased the heart rate and blood pressure, to the same extent as the tilt tests, energy in the 0.1-Hz band decreased during the reaction-time test (from 899 +/- 641 to 482 +/- 430; P less than 0.01) yet was unchanged during the mental arithmetic test. We conclude that the response of the 0.1-Hz component is a task-specific phenomenon.
W Langewitz, and
H Rüddel
April 2000,
Ginekologia polska,
W Langewitz, and
H Rüddel
January 1989,
Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics,
W Langewitz, and
H Rüddel
March 1997,
Biological psychiatry,
W Langewitz, and
H Rüddel
February 1997,
Heart (British Cardiac Society),
W Langewitz, and
H Rüddel
April 2007,
Medical engineering & physics,
W Langewitz, and
H Rüddel
January 2022,
Frontiers in cardiovascular medicine,
W Langewitz, and
H Rüddel
March 1993,
The Journal of sports medicine and physical fitness,
W Langewitz, and
H Rüddel
April 2019,
Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology,
W Langewitz, and
H Rüddel
May 2001,
Pharmacopsychiatry,
W Langewitz, and
H Rüddel
January 2006,
Fiziologiia cheloveka,
