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Effects of oral L-arginine supplementation on vasodilation and O2max in male soccer players

Effects of oral L-arginine supplementation on vasodilation and O2max in male soccer players

Study aim: To determine the effects of oral L-arginine supplementation on vasodilation, blood flow and maximum oxygen uptake (O2max) in soccer players.

Material and methods: A group of 24 healthy male soccer players aged 20 - 26 years volunteered to participate in the study. The subjects were randomly assigned into 3 groups: experimental, placebo and control. Experimental group was given L-arginine (6 g orally) and the placebo group - starch (6 g orally) daily for a week; subjects from the control group remained untreated. Before the test and at the end of the week blood samples were collected, and systemic blood pressures, blood flows and maximal oxygen uptake (O2max, by Queens College step test) were recorded. Blood samples were assayed for HDL, LDL, triglyceride and urea concentrations. The study was conducted in a randomised, single-blinded, placebo-controlled fashion consisting of 7-day treatment periods.

Results: Oral supplementation of L-arginine significantly (p<0.01) decreased blood pressure indices and increased O2max (p<0.01), blood flow (p<0.05), femoral artery diameter (p<0.05) and urea levels (p<0.05). There was no change in blood lipid levels (p<0.05). No significant changes were noted in the placebo and control groups.

Conclusions: Oral supplementation of L-arginine may have beneficial effect on vasodilation and O2max, therefore may increase the exercise capacity of soccer players.

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Discovering patterns of play in netball with network motifs and association rules

References Agrawal, R., & Srikant, R. (1994). Fast algorithms for mining association rules. Paper presented at the Proc. 20th int. conf. very large data bases, VLDB. Beckkers, J., & Dabadghao, S. (2017). Flow Motifs in Soccer: What can passing behaviour tell us? Paper presented at the In Proceedings of the 11th MIT sloan sports analytics conference, Boston, Massachusetts. Bruce, L., Brooks, E. R., & Woods, C. T. (2018). Team and seasonal performance indicator evolution in the ANZ Championship netball league. Journal of sports sciences, 36

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The Effect of Heavy Weight Training on Physiological Abilities of Soccer Players Under the Age 21 Years Old

performance in highly-trained university judo athletes. Physical education of students . 23 , 30-36 11. DELP, M. D., R. B. ARMSTRONG, D. A. GODFREY, M. H. LAUGHLIN, C. D. ROSS & M. K. WILKERSON, 2001. Exercise increases blood flow to locomotor, vestibular, cardiorespiratory and visual regions of the brain in miniature swine. The Journal of Physiology. 533 , 849-859. 12. FRANKS, I. M. & D. GOODMAN, 1986. A systematic approach to analysing sports performance. Journal of Sports Sciences . 4 , 49-59. 13. GARGANTA, J., 2009. Trends of tactical

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Including the Past: Performance Modeling Using a Preload Concept by Means of the Fitness-Fatigue Model

–13. Perl, J., & Pfeiffer, M. (2011). Perpot domo: Antagonistic meta-model processing two concurrent load flows. International Journal of Computer Science in Sport (International Association of Computer Science in Sport) , 10(2). Pfeiffer, M. (2008). Modeling the relationship between training and performance-a comparison of two antagonistic concepts. International journal of computer science in sport , 7(2), 13–32. Rasche, C., & Pfeiffer, M. (2018). Training. In A. Baca & J. Perl (Eds.), Modelling and simulation in sport and exercise (1st ed., p. 187

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Using Several Types of Virtual Characters in Sports - a Literature Survey

. J., Lawrence, G. P., John, N. W., Perrot, V., Mallet, P., Mestre, D.R. & Morgan, K. (2014). Efficacy of a Virtual Environment for Training Ball Passing Skills in Rugby. In Transactions on Computational Science XXIII (pp. 98-117). Springer Berlin Heidelberg. Mohler, B.J., Thompson, W.B., Creem-Regehr, S.H., Pick Jr., H.L. & Warren Jr., W.H. (2007). Visual flow influences gait transition speed and preferred walking speed. Experimental Brain Research, 181 (2), 221-8. DOI: 10.1007/s00221-007-0917-0 Morey Sorrentino, R., Levy, R., Katz

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Autotelic personality as a predictor of engagement in sports

References 1. Asakawa K. (2004) Flow experience and autotelic personality in Japanese college students: How do they experience challenges in daily life? J. Happiness Stud ., 5: 123-154. 2. Costa P., McCrae R. (1992) Revised NEO Personality Inventory (NEO-PI-R) and Fife-Factor Inventory (NEO-FFI) professional manual. Odessa, FL: Psychological Assessment Resources. 3. Crant J.M. (2000) Proactive Behavior in Organizations, J. Manage. , 23: 3. 4. Csikszentmihalyi M. (1990) Flow. The

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The autotelic involvement of attention induced by EEG neurofeedback training improves the performance of an athlete’s mind

References 1. Asakawa K., Csikszentmihalyi M. (2000) Feelings of connectedness and internalization of values in Asian American adolescents. J. Youth Adolesc., 29: 121–145. 2. Asakawa K. (2004) Flow experience and autotelic personality in Japanese college students: how do they experience challenges in daily life? J. Happiness Stud., 5: 123–154. 3. Arnold W. (1975) Der Pauli-Test. Anweisung zur sachgemäßen durchführung, Auswertung und Anwendung des Kraepelinschen Arbeitsbesuches 5, korrigierte Aufl. Springer-Verlag: Berlin, 1–184. 4

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The 3 vs 1 game build-up effectiveness examination in physical and technical tests of 11-year-old football players

References 1. Aguiar B., Lago M., Maças G., Sampaio J.V. (2012) A Review on the Effects of Soccer Small-Sided Games. J. Hum. Kinet., 33: 103-113. 2. Bakkera A., Oerlemansa W., Demeroutib E., Slotc B., Alid D. (2011) Flow and performance: A study among talented Dutch soccer players. Psych. Sport Exerc., 12: 442-450. 3. Bullock W., Panchuk D., Broatch J., Christian R., Stepto N.K. (2012) An integrative test of agility, speed and skill in soccer: Effects of exercise. J. Sci. Med. Sport, 15: 431

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Using thermal imaging to assess the effect of classical massage on selected physiological parameters of upper limbs

blood flow after quadriceps massage. Med. Sci. Sports Exerc., 36(8): 1308-1313. 15. Holey L.A. (2000) Connective tissue massage: a bridge between complementary and orthodox approaches. Journal of Bodywork and Movement Therapies., 4(1): 72-80. 16. Holey L.A., Dixon J., Selfe J. (2011) An exploratory thermographic investigation of the effects of connective tissue massage on autonomic function. J. Manipulative Physiol. Ther., 34(7): 457-62. 17. Jones B.F. (1998) A reappraisal of the use of thermal image analysis in medicine. IEEE Transactions on Medical Imaging, 17

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