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Skucas K.,Lithuanian Sports University | Pokvytyte V.,Lithuanian Sports University
Journal of Sports Medicine and Physical Fitness | Year: 2017

BACKGROUND: The aim of this paper was to investigate the effect of short-term period, moderate intensity and high volume endurance training on physiological variables in elite wheelchair basketball players. METHODS: Eight wheelchair basketball players were examined. The subjects participated in a two-week intervention program of mainly two training types: wheelchair basketball and wheelchair driving endurance training. The subjects performed the continuously increasing cycling exercise (CCE) at the constant 60 rpm arm cranking speed at the beginning of the program and after two weeks of the program. The initial workload was 20 W, then the workload was increased by 2 W every 5 seconds until fatigue. RESULTS: The post training of the wheelchair basketball group in the study showed a significant improvement in the peak oxygen uptake (VOpeak) and the peak power output (POpeak) VO2peat increased by 9% from 2.32±0.16 L/min to 2.53±0.2 L/min (P<0.05). POpeak increased by 28% from 141.75±14.23 W, to 181.63±26.3 W (P<0.05). The pre-training and post training test power output (PO [w]), relative power output (PO [w/kg]) increased significantly in all zones of energy production. CONCLUSIONS: In conclusion, this study indicated that the wheelchair basketball squad had relatively high levels of aerobic fitness prior to participating in the endurance training program. Nevertheless, the high-volume, moderate-intensity, short-term training program, which evolved over the two-weeks period, resulted in the improvement of the athlete's aerobic endurance. The ventilatory threshold (VT) and the second ventilatory threshold (VT2) are good markers for aerobic capacity of wheelchair athletes. © 2016 EDIZIONI MINERVA MEDICA.

Grancay M.,Slovak University of Technology in Bratislava | Vveinhardt J.,Lithuanian Sports University | Sumilo E.,University of Latvia
Scientometrics | Year: 2017

While “publish or perish” has been an integral part of academic research in Western countries for several decades, the phenomenon has made its way to Central and Eastern Europe (CEE) only recently. The current paper shows how publishing criteria in the field of economics and business have developed in seven CEE countries since 2000 and how economists have responded by altering their publishing behavior. The research indicates a dichotomous development: on one hand the annual number of Web of Science publications has increased by 317% between 2000 and 2015, economists distribute their works across a wider range of journals than before, they are more cited and the weighted average of impact factors of all journals where they publish has risen by 228%. On the other hand, however, a number of economists have chosen an opposite strategy and publish mostly in local or “predatory” journals. Recommendations for policy makers are provided on how to maximize the benefits and minimize negative impacts of the publishing criteria. © 2017 Akadémiai Kiadó, Budapest, Hungary

It is shown that a fast reliable block Fourier algorithm for the factorization of structured matrices improves computational efficiency of known method for detecting phase synchronization in a large system of coupled oscillators, based on multivariate singular spectrum analysis. In this paper, a novel algorithm for the detection of cluster synchronization in a system of coupled oscillators is proposed. The block Toeplitz covariance matrix of the total trajectory matrix is efficiently block-diagonalized by means of the Fast Fourier Transform by embedding it first into a block circulant matrix. The synchronization structure of the underlying multivariate data set is defined based on the 2D spatiotemporal eigenvalue spectrum. The benefits of the proposed method are illustrated by simulations of the phase synchronization effects in a chain of coupled chaotic Rössler oscillators and using multichannel electroencephalogram (EEG) recordings from epilepsy patients. © JVE INTERNATIONAL LTD. JOURNAL OF VIBROENGINEERING 2014.

Pukenas K.,Lithuanian Sports University
Circuits, Systems, and Signal Processing | Year: 2014

In this paper, it is shown that the block circulant matrix decomposition technique makes the multivariate singular spectrum analysis (M-SSA) a well suited tool for detecting of changes of the correlation structure in non-stationary multivariate time series in the presence of high observational noise levels. The major drawback of M-SSA, that it operates on a large covariance matrix and becomes computationally expensive, can be avoided by reordering the Toeplitz-block covariance matrix into a block Toeplitz matrix, embedding this into a block circulant matrix and efficiently block-diagonalizing this by the means of the Fast Fourier Transform (FFT) using the well known algorithm. The overall degree of synchronization among multiple-channel signals is defined by the synchronization index (the S-estimator) of the rearranged and truncated eigenvalue spectrum. Throughout the experiment, the high capability of the proposed algorithm to detect the lag-synchronized state under the influence of strong noise is validated with simulated data - a network of time series generated by autoregressive models (AR) and a network of coupled chaotic Roessler oscillators. © 2013 Springer Science+Business Media New York.

Streimikiene D.,Lithuanian Sports University
Renewable and Sustainable Energy Reviews | Year: 2015

Abstract Lithuania has developed several important climate change mitigation policy documents however there are no attempts in Lithuania to develop local climate change mitigation policies or to decentralize climate change mitigation policy. The aim of the paper is to analyse climate change mitigation policies in households. The paper presents the framework for the assessment of reasonably achievable GHG emission reduction (RAER) potential in households based on behavioral changes related to energy consumption. The paper presents the results of empirical application of developed framework in Lithuanian households. Community based social marketing approach was implemented and GHG emission reduction potential was assessed in focus groups of Kaunas region county during preparation of sustainable development strategy and long-term strategic development plan for Kaunas region county. © 2015 Elsevier Ltd

The study aimed to investigate the associations between physical inactivity and health complaints in relation to posttraumatic stress (PTS) symptoms, behavioral and nutritional factors, and sense of coherence (SOC) in eighth-grade girls enrolled in secondary schools in Kaunas, Lithuania. A random sample of girls (N = 862) was interviewed anonymously on health complaints, physical activity level, PTS symptoms, Antonovsky’s SOC scale, health behaviors, and dietary patterns. All health complaints were significantly associated with physical inactivity. Crude odds ratio (OR) for physical inactivity and health complaints was 1.67 (95%CI: 1.09- 2.56); after adjusting for PTS symptoms, the OR decreased to 1.57 (95%CI: 0.95-2.45); further adjustment for smoking, daily alcohol intake, daily consumption of fresh vegetables, and SOC decreased the OR to 1.25 (95%CI: 0.76-2.04). The effect of PTS symptoms and sense of coherence remained stable after all adjustments. The significant association between physical inactivity and health complaints was mediated by PTS symptoms. © 2015 Fundacao Oswaldo Cruz. All rights reserved.

In this paper, a novel algorithm based on the local projection noise reduction approach is applied to smooth noise for strongly contaminated chaotic oscillators. Specifically, one-dimensional time series are embedded into a high dimensional phase space and the noise level is defined through orthogonal projections of the data points within the neighbourhood of the reference point onto linear subspaces. The current vector of the phase space is denoised by performing two-dimensional discrete stationary wavelet transform (SWT)-based filtering in the neighbourhood of the phase point. Numerical results show that our algorithm effectively recovers continuous-time chaotic signals in heavy-noise environments and outperforms the classical local projection noise reduction approach for simulated data from the Rössler system and Duffing oscillator at signal-to-noise ratios (SNRs) from 15 to 0 dB, either for the real world data – human breath time series. © JVE INTERNATIONAL LTD.

Streimikiene D.,Lithuanian Sports University
Renewable and Sustainable Energy Reviews | Year: 2016

The paper focuses on financial support from EU Structural Funds to sustainable energy development in Baltic States. The paper aims to compare the use of Structural Funds support for sustainable energy development in Baltic States in two financing periods: 2007-2013 and 2014-2020 and to assess the impact of EU structural support in helping Baltic States to implement energy efficiency and renewable energy development targets set in EU energy policy documents. The paper analyses EU sustainable energy policy priorities and energy efficiency and renewable energy targets set for Baltic States and compares progress achieved in implementing energy efficiency and renewable energy targets in Baltic States after EU accession. The paper found that the EU Structural Funds have positively influenced the sustainable energy development in Baltic States. The major impact was related with increase in energy productivity because of energy savings achieved in refurbishment of residential buildings. Lithuania has achieved the biggest progress in energy productivity development since 2004 among Baltic States. Estonia was the only country from Baltic States which has allocated structural aid for promotion of wind energy and achieved the best results in increase of the share of renewables (mainly wind) in electricity generation. Latvia has the highest share of renewable in electricity generation structure and final energy consumption and did not provide support for renewable in 2007-2014 however support for biomass is foreseen in 2014-2020 financing period. © 2016 Elsevier Ltd. All rights reserved.

Streimikiene D.,Lithuanian Sports University
Renewable and Sustainable Energy Reviews | Year: 2014

Environmental pressure from residential energy use is projected to significantly increase by 2030. Different environmental policy measures provide different incentives for "environmentally responsive" consumer choices and behavioural responses. There is a great energy saving potential in residential buildings of Lithuania. Compared to the other EU countries with similar climate conditions, energy consumption for residential heating is approximately 1.8 times higher in Lithuania. About 60% of Lithuanian population resides in multi-apartment buildings constructed during 1961-1990. The aim of the paper is to define the main drivers of residential energy use in Lithuania and to compare energy saving technologies in terms of energy saving potential and costs in Lithuanian residential buildings. Seeking to achieve the aim the main tasks of the paper are to analyse theoretical issues of the main drivers of residential energy use; to analyse residential energy use trends in Lithuania and to compare these trends with other EU member states; to define the main drivers of residential energy use by applying correlation analysis; to analyse policies aiming to reduce energy consumption in residential buildings and their impacts on GHG emission reduction. The comparative study of residential energy use in Lithuania and several old EU member states showed that residential energy use per capita in Lithuania is significantly lower than in old EU member states because of the lower income per capita and lower living standards. The economic and technological factors are the main driving forces of final energy consumption in all compared EU member states; however the impact of different factors varies between countries. The comparative analysis of energy saving and GHG emission reduction potential and costs in residential buildings provided by different studies showed that the most cost-effective instruments were appliance standards, energy efficiency obligations, Demand Side Management programs, public benefit charges and labelling. © 2014 Elsevier Ltd. All rights reserved.

Jackowski S.A.,University of Saskatchewan | Baxter-Jones A.D.G.,University of Saskatchewan | Gruodyte-Raciene R.,Lithuanian Sports University | Kontulainen S.A.,University of Saskatchewan | Erlandson M.C.,University of Saskatchewan
Osteoporosis International | Year: 2015

Summary: This study investigated the long-term relationship between the exposure to childhood recreational gymnastics and bone measures and bone strength parameters at the radius and tibia. It was observed that individuals exposed to recreational gymnastics had significantly greater total bone content and area at the distal radius. No differences were observed at the tibia. Introduction: This study investigated the relationship between exposure to early childhood recreational gymnastics with bone measures and bone strength development at the radius and tibia. Methods: One hundred twenty seven children (59 male, 68 female) involved in either recreational gymnastics (gymnasts) or other recreational sports (non-gymnasts) between 4 and 6 years of age were recruited. Peripheral quantitative computed tomography (pQCT) scans of their distal and shaft sites of the forearm and leg were obtained over 3 years, covering the ages of 4–12 years at study completion. Multilevel random effects models were constructed to assess differences in the development of bone measures and bone strength measures between those exposed and not exposed to gymnastics while controlling for age, limb length, weight, physical activity, muscle area, sex, and hours of training. Results: Once age, limb length, weight, muscle area, physical activity, sex, and hours of training effects were controlled, it was observed that individuals exposed to recreational gymnastics had significantly greater total bone area (18.0 ± 7.5 mm2) and total bone content (6.0 ± 3.0 mg/mm) at the distal radius (p < 0.05). This represents an 8–21 % benefit in ToA and 8–15 % benefit to ToC from 4 to 12 years of age. Exposure to recreational gymnastics had no significant effect on bone measures at the radius shaft or at the tibia (p > 0.05). Conclusions: Exposure to early life recreational gymnastics provides skeletal benefits to distal radius bone content and area. Thus, childhood recreational gymnastics exposure may be advantageous to bone development at the wrist. © 2015, International Osteoporosis Foundation and National Osteoporosis Foundation.

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