11. Reinnervation of Vastus lateralis is increased significantly in seniors (70-years old) with a lifelong history of high-level exerciseSimone Mosole, Katia Rossini, Helmut Kern, Stefan Loefler, Hannah Fruhmann, Michael Vogelauer, Samantha Burggraf, Martina Grim-Stieger, Jan Cvecka, Dušan Hamar, Milan Sedliak, Nejc Šarabon, 2013, izvirni znanstveni članek Ključne besede: aging, human skelet muscle, lifelong physical exercise, senior sportsmen, denervation and reinnervation, fiber-type grouping, training
Objavljeno v RUP: 15.10.2015; Ogledov: 2798; Prenosov: 272
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14. FES training in agingHelmut Kern, Stefan Loefler, Christian Hofer, Michael Vogelauer, Samantha Burggraf, Martina Grim-Stieger, Jan Cvecka, Dušan Hamar, Nejc Šarabon, Feliciano Protasi, Antonio Musarň, Marco Sandri, Katia Rossini, Ugo Carraro, Sandra Zampieri, 2012, izvirni znanstveni članek Ključne besede: FES, exercise training, aging, functional analyses, mobility, muscle fiber size
Objavljeno v RUP: 15.10.2013; Ogledov: 3717; Prenosov: 71
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17. Strength training in elderly people improves static balanceNejc Šarabon, Stefan Loefler, Jan Cvecka, Milan Sedliak, Helmut Kern, 2013, izvirni znanstveni članek Opis: Aim of this study was to investigate the effects of two different types of strength training programs on static balance in elderly subjects. Subjects older than 65 years of age were enrolled and assigned to control group (CG, n =19), electrical stimulation group (ES, n = 27) or leg press group (LP, n = 28). Subjects in both the training groups were exposed to training (2-3x/week) for a period of 9 weeks. In the ES group the subjects received neuromuscular electrical stimulation of the anterior thigh muscles. In the LP group the subjects performed strength training on a computer-controlled leg press machine. Before and after the training period, static balance of the subject was tested using a quiet stance task. Average velocity, amplitude and frequency of the center-of-pressure (CoP) were calculated from the acquired force plate signal. The data was statistically tested with analysis of (co)variance and t-tests. The three groups of subjects showed statistically significant differences (p < 0.05) regarding the pre-training vs. post-training changes in CoP velocity, amplitude and frequency. The differences were more pronounced for CoP velocity and amplitude, while they were less evident in case of mean frequency. The mean improvements were higher in the LP group than in the ES group. Our results provide supportive evidence to the existence of the strength-balance relationship. Additionally, results indicate the role of recruiting central processes and activation of functional kinetic chains for the better end effect
Ključne besede: balance, aging, falls, strength, training
Objavljeno v RUP: 15.10.2013; Ogledov: 3323; Prenosov: 237
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18. The effect of vision elimination during quiet stance tasks with different feet positionsNejc Šarabon, Jernej Rošker, Stefan Loefler, Helmut Kern, 2013, izvirni znanstveni članek Opis: Literature confirms the effects of vision and stance on body sway and indicates possible interactions between the two. However, no attempts have been made to systematically compare the effect of vision on the different types of stance which are frequently used in clinical and research practice. The biomechanical changes that occur after changing shape and size of the support surface suggest possible sensory re-weighting might take place. The purpose of this study was to assess the effect of vision on body sway in relation to different stance configurations and width. Thirty-eight volunteers performed four quiet stance configurations (parallel, semi-tandem, tandem and single leg), repeating them with open and closed eyes. Traditional parameters, recurrence quantification analysis and sample entropy were analyzed from the CoP trajectory signal. Traditional and recurrence quantification analysis parameters were affected by vision removal and stance type. Exceptions were frequency of oscillation, entropy and trapping time. The most prominent effect of vision elimination on traditional parameters was observed for narrower stances. A significant interaction effect between vision removal and stance type was present for most of the parameters observed (p < 0.05). The interaction effect between medio-lateral and antero-posterior traditional parameters differed in linearity between stances. The results confirm the effect of vision removal on the body sway. However, for the medio-lateral traditional parameters, the effects did not increase linearly with the change in width and stance type. This suggests that removal of vision could be more effectively compensated by other sensory systems in semi-tandem stance, tandem and single legged stance
Ključne besede: balance, Body sway, Sensory manipulation, vision
Objavljeno v RUP: 15.10.2013; Ogledov: 3502; Prenosov: 146
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