We analyzed human postural responses to muscle vibration applied at four different frequencies to lower leg muscles, the lateral gastrocnemius (GA) or tibialis anterior (TA) muscles. The muscle vibrations induced changes in postural orientation characterized by the center of pressure (CoP) on the force platform surface on which the subjects were standing. Unilateral vibratory stimulation of TA induced body leaning forward and in the direction of the stimulated leg. Unilateral vibration of GA muscles induced body tilting backwards and in the opposite direction of the stimulated leg. The time course of postural responses was similar and started within 1 s after the onset of vibration by a gradual body tilt. When a new slope of the body position was reached, oscillations of body alignment occurred. When the vibrations were discontinued, this was followed by rapid recovery of the initial body position. The relationship between the magnitude of the postural response and frequency of vibration differed between TA and GA. While the magnitude of postural responses to TA vibration increased approximately linearly in the 60-100 Hz range of vibration frequency, the magnitude of response to GA vibration increased linearly only at lower frequencies of 40-60 Hz. The direction of body tilt induced by muscle vibration did not depend on the vibration frequency., A. Polónyová, F. Hlavačka., and Obsahuje bibliografii
The text examines school failure and the underachievement of boys in the light of the wider context of gendered, un/equal opportunities in the education system and process. Recent findings from international research reports are raised in a discussion to confirm or refute theories of the marginalization of boys and young men. Based on relevant Czech statistical data, the article contributes to opening up Czech sociological debate on gendered educational and life courses., Iva Šmídová., tabulky, and Obsahuje bibliografii
Sociology and sociological theory have been effective in analyzing societal and institutional conflict and violence, but less so in analyzing the specifics of interpersonal violence. This article examines the sociological significance of domestic violence. This relationship, or sometimes its neglect, is underlain by several tensions and paradoxes, which in turn have broader implications for sociology, sociological theory and social theory. These matters are examined through: the possible paradox of violence and intimacy in the phenomenon of domestic violence; the importance of the naming and framing of such violence; explanation, responsibility and agency; and gender, hegemony and discourse in men’s violence to known women, as part of a multi-faceted power approach., Jeff Hearn., and Obsahuje použitou literaturu