Effects of Anti-Orthostatic Hypokinesia on the Parameters of Vertical Posture: Orthostatic and Stabilometric Study
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Bulletin of Experimental Biology and Medicine, Vol. 169, No. 1, May, 2020 GENERAL PATHOLOGY AND PATHOPHYSIOLOGY
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Effects of Anti-Orthostatic Hypokinesia on the Parameters of Vertical Posture: Orthostatic and Stabilometric Study D. O. Orlov, T. V. Sukhostavtseva, A. V. Shpakov, A. A. Puchkova, D. M. Stavrovskaya, V. A. Sedelkova, and A. A. Artamonov
Translated from Byulleten’ Eksperimental’noi Biologii i Meditsiny, Vol. 169, No. 1, pp. 13-16, January, 2020 Original article submitted August 15, 2019 The effects of anti-orthostatic hypokinesia on the parameters of vertical posture (orthostatic and postural stability) were studied. Anti-orthostatic hypokinesia was followed by orthostatic instability manifested in a decrease in the tolerance time in the orthostatic test, a significant increase in HR and systolic BP starting from the 11th minute of the test. Significant changes in the parameters reflecting postural stability were observed starting from minutes 10-11 of the stabilometric test. Anti-orthostatic hypokinesia was shown to affect all parameters of postural stability; symmetry in paired stabilometric tests was impairmed. Key Words: anti-orthostatic hypokinesia; stabilometric test; posture; orthostatic stability; stable posture Maintenance of vertical posture is an active process involving several systems of human body. After space flights of different duration, balance impairments are observed in astronauts under conditions normal gra vity. The development of postural instability is a manifestation of negative effects of zero gravity on human body [3,8]. A decrease in orthostatic stability plays an important role in impairment of vertical posture after space flights [5]. Here we compared the results of stabilometric study and test of orthostatic stability.
MATERIALS AND METHODS The study included 10 healthy male volunteers aging 19-32 years (23.11±5.2 years) weight 72-90 kg (78.5±6.6 kg), height 172-192 cm (179.7±6.3 cm). All participants successfully passed medical tests suggested by medical assessment board of the Federal Clinical Research Centre of the Federal Medical-Biological Agency of Russia and were admitted to the experiment. All the participants were informed about the Research Institute for Space Medicine, Federal Research Clinical Centre, Federal Medical-Biological Agency of Russia, Moscow, Russia. Address for correspondence: [email protected]. A. V. Shpakov
purpose and procedures of the experiment and signed written consent [7]. The study protocol was approved by the Bioethics Committee of the Research Institute of Space Medicine, Federal Clinical Research Centre of the Federal Medical-Biological Agency of Russia (protocol No. 1, February 7, 2019). The scheme of the investigation is presented in Figure 1. Anti-orthostatic hypokinesia (AOH) with -6° head-down tilt was used as a model of zero gravity [4]. The duration of AOH exposure was 3 days. The orthostatic stability of the participants was evaluated at the first day of AOH and directly after termination of these conditions using a rota
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