Time filter

Source Type

Guilherme J.,University of Porto | Garganta J.,University of Porto | Graca A.,University of Porto | Seabra A.,University of Porto | Seabra A.,Research Center in Physical Activity
Revista Brasileira de Cineantropometria e Desempenho Humano | Year: 2015

The functional asymmetry of the lower limbs has been considered an important factor in the performance of soccer players. In this sense, the purpose of this study was to examine the effects of specific technical training for non-preferred foot on its utilization rate during the game; and to investigate if interruption of a technical training program me for the non-preferred foot influences its utilization rate during the game. Fifty young soccer players were randomly divided into two groups: G1 (n=26, 9.50±1.04 years) and G2 (n=24, 9.58±1.02 years). At the beginning of the first 4 months, each player’s use of both feet during the game was assessed. Te study lasted eight months divided into two periods of four months. In the first training period G1 was subjected to a technical training programme directed to the non-preferred foot, while G2 had no constraints on the use of both feet. At the end of the 4th month the two groups were newly assessed. During the second training period G1 and G2 reversed the training programmes. After the 8 months of training the evaluation of the utilization rate of both feet during small-side games was again performed. Te main conclusions of the study were: (i) the technical training of the non-preferred foot allowed significant increases in its utilization rate during small-sided games; (ii) the interruption of such training partially reversed this effect. Thus, technical training for the non-preferred foot should be systematically performed in order to maintain the positive effects induced over functional asymmetry. © 2015, Universidade Federal de Santa Catarina. All rights reserved. Source

Alves A.J.,Research Center in Physical Activity
Metabolism: Clinical and Experimental | Year: 2010

Hypoxia-inducible factor 1 (HIF-1) is a transcription factor that regulates gene expression in response to hypoxia and has been associated with athletic performance. The aims of this study were (1) to determine the frequency distribution of HIF1A Pro582Ser (rs11549465) polymorphism among 155 Israeli athletes (sprinters and endurance athletes) and 240 healthy controls and (2) to analyze the influence of the interaction between HIF1A Pro582Ser and ACTN3 R577X (rs1815739) genotypes on sprint performance. There were no differences across the HIF1A genotype and allele frequencies among endurance athletes, sprinters, and controls. Similarly, no differences were found between the subgroups of top-level and national-level endurance athletes, or between top-level and national-level sprinters. Conversely, interaction effects were found between HIF1A Pro582Ser and ACTN3 R577X polymorphisms and sprinters. The proportion of HIF1A Pro/Pro + ACTN3 R/R genotypes was significantly higher in sprinters than in endurance athletes and healthy controls (P = .002). In addition, the odds ratio for HIF1A Pro/Pro + ACTN3 R/R genotype carriers being a sprinter was 2.25 (95% confidence interval, 1.24-4.1); and that for HIF1A Pro/Pro + ACTN3 R/R genotype carriers being an endurance athlete was 0.5 (95% confidence interval, 0.2-1.24). We conclude that HIF1A Pro582Ser polymorphism by itself is not critical in determining sprint performance. However, sprinter performance is determined by the interaction between the wild-type HIF1A Pro/Pro genotype and ACTN3 RR genotype. © 2010 Elsevier Inc. All rights reserved. Source

Mota N.,Polytechnic Health Institute of the North | Ribeiro F.,Polytechnic Health Institute of the North | Ribeiro F.,Research Center in Physical Activity
Isokinetics and Exercise Science | Year: 2012

This study aimed to investigate the association between shoulder proprioception and shoulder rotators strength in water polo players. Twenty male water polo players aged 20.2 ± 2.3y participated in the study. Shoulder proprioception was evaluated by assessing joint position sense (JPS) at 30° of external rotation and at 30° of internal rotation. Shoulder external and internal rotators concentric and eccentric muscle strength was evaluated isokinetically at 120°/s. JPS acuity at 30° of external rotation [4.7 (3.5°)] was similar to that observed at 30° of internal rotation [4.0 (5.3°)]. The external/internal rotators strength ratio were 0.67 (0.23) and 0.66 (0.18), respectively for concentric and eccentric efforts while the dynamic control ratio was 0.69 [0.16]. Negative and significant correlations were found between relative error at 30° of external rotation and concentric and eccentric external rotators PT: r = -0.445 and r = -0.483, respectively, and the eccentric strength ratio of the external to internal rotators (r =-0.505). In addition the dynamic control ratio was lower than the recommended values for overhead athletes, which may expose/predispose the players to shoulder injury. © 2012 - IOS Press and the authors. All rights reserved. Source

Goncalves I.O.,Research Center in Physical Activity | Passos E.,University of Porto | Diogo C.V.,University of Coimbra | Rocha-Rodrigues S.,Research Center in Physical Activity | And 4 more authors.
Applied Physiology, Nutrition and Metabolism | Year: 2016

Mitochondrial quality control and apoptosis have been described as key components in the pathogenesis of nonalcoholic steatohepatitis (NASH); exercise is recognized as a nonpharmacological strategy to counteract NASH-associated consequences. We aimed to analyze the effect of voluntary physical activity (VPA) and endurance training (ET) against NASH-induced mitochondrial permeability transition pore (mPTP) opening and mitochondrial and cellular quality control deleterious alterations. Forty-eight male Sprague-Dawley rats were divided into standard-diet sedentary (SS, n = 16), standard-diet VPA (n = 8), high-fat diet sedentary (HS, n = 16), and high-fat diet VPA (n = 8). After 9 weeks of diet treatment, half of the SS and HS groups were engaged in an ET program for 8 weeks, 5 days/week, 1 h/day. Liver mPTP susceptibility through osmotic swelling, mPTP-related proteins (cyclophilin D, Sirtuin3, Cofilin-1), markers of mitochondrial biogenesis ((mitochondrial transcription factor A (Tfam) and peroxisome proliferator-activated receptor gamma co-activator protein (PGC-1α)), dynamics (Mitofusin 1 (Mfn1), Mitofusin 2 (Mfn2), Dynamin related protein 1, and Optic atrophy 1)), auto/mitophagy (Beclin-1, microtubule-associated protein 1 light chain 3, p62, PINK1, and Parkin), and apoptotic signaling (Bax, Bcl-2) and caspases-like activities were assessed. HS animals showed an increased susceptibility to mPTP, compromised expression of Tfam, Mfn1, PINK1, and Parkin and an increase in Bax content (HS vs. SS). ET and VPA improved biogenesis-related proteins (PGC-1α) and autophagy signaling (Beclin-1 and Beclin-1/Bcl-2 ratio) and decreased apoptotic signaling (caspases 8 activity, Bax content, and Bax/Bcl-2 ratio). However, only ET decreased mPTP susceptibility and positively modulated Bcl-2, Tfam, Mfn1, Mfn2, PINK1, and Parkin content. In conclusion, exercise reduces the increased susceptibility to mPTP induced by NASH and promotes the increase of auto/mitophagy and mitochondrial fusion towards a protective phenotype. © 2016 National Research Council of Canada, All rights reserved. Source

Autran R.G.,Research Center in Physical Activity | Abreu S.,Research Center in Physical Activity | Silva P.,Research Center in Physical Activity | Pina M.F.,University of Porto | And 4 more authors.
Sport Sciences for Health | Year: 2015

Purpose: The aim of this study was to verify whether or not adolescents’ perception of physical activity (PA) facilities in their neighbourhood affects moderate–vigorous physical activity level (MVPA). Methods: The final sample comprised 320 Portuguese adolescents (59.7 % girls) aged 14–18 years and enrolled in 9th–12th school grade. The Neighbourhood Environment Walkability Scale-Youth survey was used to evaluate the distance perception from adolescents’ homes to PA facilities. MVPA level was evaluated by accelerometers GT1M, and Evenson’s cut-points were considered. Results: Boys were more active than girls, mean SD (57.86, 21.05 vs. 51.02, 20.42, p = 0.04). PA facilities type and proximity perception were not associated to MVPA level (p > 0.05), after adjusting for gender, age, socio-economic status, body mass index, and waist–height ratio. Conclusion: Type and number of PA facilities perceived nearest to home were not related with MVPA level in this Portuguese adolescent sample. However, girls who perceived a school with recreation facilities near their home showed an association with MVPA intensity. © 2015, Springer-Verlag Italia. Source

Discover hidden collaborations