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Reliability of novel postural sway task test
Milan Sedliak, Jan Cvecka, Veronika Tirpáková, Stefan Loefler, Nejc Šarabon, Helmut Kern, Dušan Hamar, 2013, original scientific article

Abstract: The purpose of this study was to examine the reliability of parameters obtained from a novel postural sway task test based on body movements controlled by visual feedback. Fifty-nine volunteers were divided into two groups. The first group consisted of young (n = 32, 16 females and 16 males, age: 25.2 3.4 years) and the second group of elderly individuals (n = 27, 17 females and 10 males, age: 75.7 6.9 years). Participants stood in parallel on a computer based stabilographic platform with the feet approximately a shoulder width apart, the toes slightly pointing outwards, the hands placed on the hips. The computer screen was placed approximately 1.5 meter from the platform at a height of subjects eyes. An instantaneous visual feedback of participants centre of pressure (COP) was given in a form of a blue cross visible on the screen. Participants were instructed to keep the blue cross driven by movements of their hips as close as possible to a predefined curve flowing on the screen. Out of the 6 parameters studied, only the average distance of COP from the curve line and the sum of the COP crossings through the curve line showed high reliability. Correlation between these two highly reliable parameters was -0.89. There was also a statistical difference (p<0.001) between young and elderly in both the average distance of COP from the curve line and the sum of the COP crossings through the curve. To conclude, the novel postural sway task provides a simple tool with relatively low time burden needed for testing. The suggested output parameters measured are highly reliable and easy to interpret
Found in: osebi
Keywords: balance, postural control, task test, visual feedback
Published: 15.10.2013; Views: 1965; Downloads: 130
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Does pre-exercise static stretching inhibit maximal muscular performance?
Luka Simić, Nejc Šarabon, Goran Marković, 2012, original scientific article

Found in: osebi
Keywords: warm-up, stretch, performance, acute effects
Published: 15.10.2013; Views: 2072; Downloads: 33
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Biomechanics of cycling
Borut Fonda, Nejc Šarabon, 2010, review article

Found in: osebi
Keywords: kolesarstvo, biomehanika, kineziologija
Published: 15.10.2013; Views: 3017; Downloads: 30
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Adjusted saddle position counteracts the modified muscle activation patterns during uphill cycling
Borut Fonda, Andrej Panjan, Goran Markovič, Nejc Šarabon, 2011, original scientific article

Abstract: The main aim of this project was to study muscle activity patterns during steep uphill cycling (UC) (i.e., with a gradient of 20%) with (1) normal saddle geometry and (2) with adjusted saddle position ASP (i.e., moving the saddle forward and changing the tilt of the saddle by 20%). Based on our preliminary case study, we hypothesized that: (1) during 20% UC muscle activity patterns would be different from those of level cycling (LC) and (2) during 20% UC with ASP muscle activity patterns would resemble those of LC. Twelve trained male cyclists were tested on an electromagnetically braked cycle ergometer under three conditions with the same work rate (80% of maximal power output) and cadence (90 rpm): level (LC), 20% UC and 20% UC with ASP. Electromyographic signals were acquired from m. tibialis anterior (TA), m. soleus (SO), m. gastrocnemius (GC), m. vastus lateralis (VL), m. vastus medialis (VM), m. rectus femoris (RF), m. biceps femoris (BF) and m. gluteus maximus (GM). Compared to LC, 20% UC significantly modified both the timing and the intensity of activity of the selected muscles, while muscles that cross the hip joint were the most affected (RF later onset, earlier offset, shorter range of activity and decrease in peak amplitude of 34%; BF longer range of activity; GM increase in peak amplitude of 44%). These changes in EMG patterns during 20% UC were successfully counteracted by the use of ASP and it was interesting to observe that the use of ASP during 20% UC was perceived positively by all cyclists regarding both comfort and performance. These results could have a practical relevance in terms of improving performance during UC, together with reducing discomfort
Found in: osebi
Keywords: cycling, electromyography, bicycle geometry, muscular coordination
Published: 15.10.2013; Views: 2350; Downloads: 81
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Kinaesthesia and methods for its assessment
Jernej Rošker, Nejc Šarabon, 2010, review article

Found in: osebi
Keywords: kinaesthetic sense, proprioception, measuring methods, kinesiology
Published: 15.10.2013; Views: 2025; Downloads: 19
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Effects of whole-body cryotherapy on recovery after hamstring damaging exercise
Borut Fonda, Nejc Šarabon, 2013, original scientific article

Abstract: The purpose of this study was to examine the effects of whole-body cryotherapy (WBC) on biochemical, pain, and performance parameters during the 5-day recovery period after damaging exercise for hamstrings. Participants completed a bout of damaging exercise for the hamstring muscles on two separate occasions (control and experimental condition) separated by 10 weeks. During the control condition, subjects received no treatment after the damaging exercise. The experimental condition consisted of WBC everyday during the recovery period. WBC included single 3-min daily exposures to low temperatures (-140 to -195 °C) in the cryo-cabin. During the recovery period, subjects were tested for biochemical markers, perceived pain sensation, and physical performance (squat jump, counter movement jump, maximal isometric torque production, and maximally explosive isometric torque production). Majority of the observed variables showed statistically significant time effects (P < 0.05) in control group, which indicates the presence of muscle damage. Significant interaction between the control and WBC condition was evident for the rate of torque development (P < 0.05). Pain measures substantially differed between the WBC and the control condition after the exercise. Results of this study are not completely supportive of the use of WBC for recovery enhancement after strenuous training
Found in: osebi
Keywords: whole-body cryotherapy, damaging exercise, hamstring muscles, recovery
Published: 15.10.2013; Views: 2337; Downloads: 38
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Effects of trunk functional stability training in subjects suffering from chronic low back pain
Nejc Šarabon, Polona Palma, Rok Vengust, Vojko Strojnik, 2011, original scientific article

Found in: osebi
Keywords: low back pain, chronic pain, kinesiotherapy, training effects
Published: 15.10.2013; Views: 2682; Downloads: 43
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The effects of aging on the rambling and trembling components of postural sway
Nejc Šarabon, Andrej Panjan, Mark L. Latash, 2013, original scientific article

Abstract: The effects of healthy aging on postural sway and its rambling and trembling components were studied. Young and elderly subjects stood quietly for 1 min in different postures, and with eyes open and closed. We found that age-related changes in postural sway and its components were similar to those observed in young participants in challenging conditions. These changes may therefore be viewed as secondary to the increased subjective perception of the complexity of postural tasks. Contrary to our expectations, stronger effects of age were seen in characteristics of rambling, not trembling. The commonly accepted hypothesis that older persons rely on vision more was not supported by this study: we found no significant interaction effects of age and vision on any of the sway characteristics. It was concluded that the reported higher reliance on vision in older persons may be task-specific. The results are compatible with the ideas that much of the age-related changes in postural sway emerge at the level of exploring the limits of stability and using the drift-and-act strategy. Our results suggest that the dominant view on rambling and trembling as reflecting supraspinal and peripheral mechanisms, respectively, may be too simplistic
Found in: osebi
Keywords: postural control, aging, sway, rambling, trembling
Published: 15.10.2013; Views: 1792; Downloads: 34
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Development of software for comprehensive analyses of force plate measurements
Nejc Šarabon, 2011, original scientific article

Found in: osebi
Keywords: biomechanics, assessment, instrumentation
Published: 15.10.2013; Views: 2352; Downloads: 26
URL Full text (0,00 KB)

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