Lucas Mortimer
Luciano Condessa
Vinícius Rodrigues
Daniel Coelho
Danusa Soares
Emerson Silami-Garcia
Universidade Federal de Minas Gerais
Escola de Educação Física, Fisioterapia e Terapia Ocupacional, Centro de Excelência Esportiva (CENESP), Belo Horizonte, Minas Gerais, Brasil.
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RESUMO
Constitui objetivo deste estudo comparar a intensidade do esforço (IE) de atletas de futebol entre o primeiro e o segundo tempo de jogos oficiais. Métodos: Foram avaliados 25 atletas (17,5 ± 1,2 anos; 8,5 ± 1,0% de gordura corporal; 175,1 ± 6,8 cm; 69,3 ± 5,2 kg e VO2máx de 52,2 ± 3,3 mlO2•kg-1•min-1) pertencentes a um clube da primeira divisão do futebol brasileiro. A freqüência cardíaca (FC) dos atletas foi medida usando-se um conjunto de cardiofrequencímetros, durante jogos de competições oficiais, sendo 14 jogos da categoria juvenil (menos de 17 anos) e 8 jogos da categoria júnior (menos de 21 anos). A freqüência cardíaca máxima (FCmáx) de cada atleta foi considerada como o maior valor de FC observado entre dois testes máximos (corrida de 1000m e 2400m) utilizados para a determinação da mesma. Nos casos em que foram observados valores superiores da FC durante as situações de jogo em relação aos testes, esta foi considerada como a FCmáx individual. Os resultados foram analisados usando-se o teste t-Student com nível de significância adotado de p<0,05. Resultados: Foi observada diferença (p<0,01) da FC média e do percentual da freqüência cardíaca máxima (%FCmáx) entre o primeiro tempo (170 ± 8 bpm e 85,2 ± 4,5%FCmáx) e o segundo tempo (166 ± 10 bpm e 82,7 ± 4,6%FCmáx). Os resultados traduzem uma menor intensidade do esforço no segundo tempo de jogo, comparativamente com o primeiro tempo.
Palavras-chave: futebol, freqüência cardíaca, intensidade de esforço.
ABSTRACT
Comparison between the effort intensity of young soccer players in the first and second halves of the soccer game.
Objective: Compare the effort intensity (IE) of young soccer players between the first and second halves of official games. Methods: 25 athletes were evaluated (17,5 ± 1,2 years; 8,5 ± 1,0% of body fat; 175,1 ± 6,8 cm; 69,3 ± 5,2 kg and VO2máx of 52,2 ± 3,3 mlO2•kg-1•min-1) who pertained to a club of the first division of the Brazilian soccer. Heart rate (HR) of the athletes was measured using a set of heart rate monitors, during official games, being 14 games of the under-17 category (U-17) and 8 games of the under-20 category (U-20). The maximal heart rate (MHR) for each athlete was considered as the highest HR observed during two maximal effort tests (race of 1000m and 2400m). In the cases which a higher value of HR was observed during game situations in relation to the tests, this was considered the MHR. Results were analyzed using Student t test and the accepted level of significance was p<0,05. Results: There was a significant difference (p<0,01) between the average HR and the percentage of maximal heart rate (%MHR) between first half (170 ± 8 bpm and 85,2 ± 4,5%MHR) and second half (166 ± 10 bpm e 82,7 ± 4,6%MHR). These results show a lower effort intensity in the second half of the game, in comparison with the first half.
Key Words: soccer, heart rate, effort intensity.
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REFERÊNCIAS
1. Achten J, Jeukendrup AE (2003). Heart rate monitoring: applications and limitations. Sports Medicine 33, 7: 517-538. [ Links ]
2. Ali A, Farrally M (1991). Recording soccer players’ heart rates during matches. Journal of Sports Sciences 9, 183-189.
3. Astrand I, Astrand PO, Christensen EH, Hedman R (1960). Intermittent muscular work. Acta Physiologica Scandinavica 48, 448-453.
]]> 4. Aziz AR, Chia M, The KC (2000). The relationship between maximal oxygen uptake and repeated sprint performance indices in field hockey and soccer players. The Journal of Sports Medicine and Physical Fitness 40, 3:195-200.5. Bangsbo J (1994). The physiology of soccer, with special reference to intense intermittent exercise. Acta Physiologica Scandinavica: an international journal of physiological sciences, v. 151, suplementum 619.
6. Bangsbo J, Lindquist F (1992). Comparison of various exercise tests with endurance performance during soccer in professional players. International Journal of Sports Medicine 13, 2:125-132.
7. Bangsbo J, Norregaard L, Thorso F (1991). Activity profile of competition soccer. Canadian Journal of Sports Sciences, 16, 2: 110-116.
8. Capranica L, Tessitore A, Guidetti L, Figura F (2001). Heart rate and match analysis in pre-pubescent soccer players. Journal of Sports Sciences 19, 6: 379-384.
9. Drust B, Reilly T, Cable NT (2002). Metabolic and physiological responses to a laboratory-based soccer-specific intermittent protocol on a non-motorised treadmill. In Fourth World Congress of Science and Football, 4, 1999, Sydney. London: E & FN Spon, 217-225.
10. Ekblom B (1986). Applied Physiology of Soccer. Sports Medicine 3, 50-60.
11. Eston RG, Rowlands AV, Ingledew DK (1998). Validity of heart rate, pedometry, and acceleromety for predicting the energy cost of children’s activities. Journal of Applied Physiology 84, 1: 362-371.
12. FIFA - Federation Internationale de Football Association. Disponível em: <www.fifa.com>. Acessado em: Junho de 2005.
13. Flanagan T, Merrick E (2002). Quantifying the work-load of soccer players. In: Fourth World Congress of Science and Football, 4, 1999, Sydney. London: E & FN Spon, 341-349.
]]> 14. Gleim GW, Witmant PA, Nicolas JA (1981). Indirect assessment of cardiovascular “demands” using telemetry on professional football players. The American Journal of Sports Medicine 9, 3: 178-183.15. Helgerud J, Engen LC, Wisloff U, Hoff J (2001). Aerobic endurance training improves soccer performance. Medicine and Science in Sports Exercise 33, 11: 1925-1931.
16. Karvonen J, Vuorimaa T (1988). Heart hate and exercise intensity during sports activities; practical application. Sports Medicine 5: 303-312.
17. Margaria R, Aghemo P, Pinera LF (1975). A simple relation between performance in running and maximal aerobic power. Journal Applied Physiology 38, 2: 351-352.
18. Miles A, Mclaren D, Reilly T, Yamanaka K (1993). An analysis of physiological strain in four-a-side women’s soccer. In Second World Congress of Science and Football, 2, 1991, Eindhoven. Proceedings. London: E & FN Spon, 140-145.
19. Mohr M, Krustrup P, Nybo L, Nielsen JJ, Bangsbo J (2004). Muscle temperature and sprint performance during soccer matches – beneficial effect of re-warm-up at half-time. Scandinavian Journal of Medicine and Science in Sports 14, 156-162.
20. O’Connor D (2002). Time–Motion analysis of elite touch players. In Fourth World Congress of Science and Football, 4, 1999, Sydney. London: E & FN Spon, 126-136.
21. Ogushi T, Ohashi J, Nagahama H, Isokawa S, Suzuki S (1993). Work intensity during soccer match-play (a case study). In Second World Congress of Science and Football, 2, 1991, Eindhoven. Proceedings. London: E & FN Spon, 121-123.
22. Rebelo, A. N. (2002). Estudo da fadiga no futebol. In Garganta J, Suarez AA, Peñas LC (Eds.) A investigação em futebol: estudos Ibéricos. Porto: Faculdade de Ciências do Desporto e de Educação Física da Universidade do Porto, 121-127.
23. Rienzi E, Drust B, Reilly T, Carter JEL, Martin A (2000). Investigation of antropometric and work-rate profiles of elite south American international soccer player. Journal Sports Medicine and Physical Fitness 40, 162-9.
]]> 24. Reilly T (1997). Energetic of high intensity exercise (soccer), with particular reference to fatigue. Journal of Sports Sciences 15: 257-263.25. Reilly T, Keane S (2002). Estimation of physiological strain on Gaelic football players during match-play. In Fourth World Congress of Science and Football, 4, 1999, Sydney. London: E & FN Spon, 157-159.
26. Shephard RJ (1992). The energy needs of the soccer player. Clinical Journal of Sports Medicine 2, 1: 62-70.
27. Smith M, Glarke G, Hale T, McMorris T (1993). Blood lactate levels in college soccer players during match-play. In Second World Congress of Science and Football, 2, 1991, Eindhoven. London: E & FN Spon, 129-134.
28. Stølen T, Chamari K, Castagna C, Wisløff U (2005). Physiology of soccer: an update. Sports Medicine 35, 6: 501-536.
29. Strath SJ, AM Swartz, DR Bassett, JR O'Brien WL, GA King, BE Ainsworth (2000). Evaluation of heart rate as a method for assessing moderate intensity physical activity. Medicine and Science in Sports Exercise 32, 9, supplement, S465-S470.
30. Strudwick A, Reilly T, Doran D (2002). Anthropometrics and fitness profiles of elite players in two football codes. Journal of Sports Medicine and Physical Fitness 42, 239-242.
31. Treiber FA, Musante L, Hartdagan S, Davis H, Levy M, Strong WB (1989). Validation of a heart rate monitor with children in laboratory and field settings. Medicine and Science in Sports Exercise 21, 3: 338-342.
32. Wilmore HJ, Haskell WL (1972). Body composition and endurance capacity of professional football players. Journal of Applied Physiology 33, 5: 564-567.
33. Wisloff U, Helgerud J, Hoff J (1998). Strength and Endurance of elite soccer players. Medicine and Science in Sports Exercise 30, 3: 462-467.
]]>AGRADECIMENTOS
CNPq, CAPES, FAPEMIG e Ministério do Esporte.
CORRESPONDÊNCIA
Emerson Silami Garcia
Rua Rio de Janeiro, 2779, apto. 602,
Lourdes, Belo Horizonte, MG
BRASIL
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