Na postagem do blog esse mes vou demonstrar um trabalho feito pelo nosso grupo de pesquisa (LAEF/CNPq - CDS/UFSC) que foi apresentado no ultimo congresso internacional do Colegio Europeu de Ciencias do Esporte - European College of Sport Science.Helal,LCAS.1, Souza,KM.1, de Lucas, RD.1, Nascimento,PC.1, Guglielmo, LGA.1, Denadai, BS.21UFSC(Florianopolis, Santa Catarina, Brazil), 2UNESP (Rio Claro, SaoPaulo, Brazil)IntroductionThephysiological nature of anaerobic work capacity (AWC) has received littleconsideration in comparison to critical power (CP). Therefore, the aim of thisstudy was to analyze the influence of prior exercise performed at different workrates above CP (with the same AWC rate depletion) on muscle fatigue during a subsequentisokinetic cycling sprint.MethodsFifteenhealthy male subjects (mean SD; age, 26.0 3.5 years; weight, 76.6 10.4kg; height, 178.2 7.6 cm) volunteered to participate in this study. Each subject performed the followingtesting stages: 1) a ramp incremental test (25 W/min) to measure maximal oxygenuptake (VO2max)and maximal power output (Pmax); 2) a 5-sall-out isokinetic sprint test at 120-rpm to measure cycling peak torque in controlcondition (TCON); 3) four constant work rate testsperformed to exhaustion (over a range of times between 2 and 12 min) for CP andAWC determination; and 4) two constant work rate tests, each at work rate set to deplete 70% AWC (thetime integral of the work rate above CP consuming 70% of AWC) either 3-min or 10-min,followed immediately by a 5-s all-out isokinetic sprint test at 120-rpm tomeasure cycling peak torque in the experimental conditions (TEXP3minand TEXP10min). Peak torque was considered as the average of the peaktorque for each leg in all conditions. For comparisons, one-way repeated measure ANOVA followed by Bonferronis paired t-testwas used. The level of significance was set at p < 0.05.Figure 1. Schematic illustrationof the experimental tests. A) 5 s all-out isokinetic exercise performedimmediately after the fatiguing exercise set to deplete 70% W in 3 min. B) 5 sall-out isokinetic exercise performed immediately after the fatiguing exercise setto deplete 70% W in 10 min.ResultsTheVO2maxand Pmax were 3.71 0.49 L.min-1 and 322 26 W,respectively. The CP and AWC were 207 17 W (r2 = 0.99 0.01; SEE = 3.9 2.7 W; 64.3 2.7% Pmax) and21.3 4.2 kJ, respectively. The constant work rate tests, which were set to deplete 70% AWC(14.9 3.0 kJ) in 3 min and 10 min, were performed at 289 25 W (89.8 2.9% Pmax)and 231 19 W (71.9 2.2% Pmax),respectively. TEXP3min (108.4 19.8 Nm) and TEXP10min(112.1 23.0 Nm) decreased significantly (F = 19,68; p < 0,001) in the samemagnitude (p = 0,46) in comparisonto TCON (135.5 20.2 Nm).DiscussionTheresult of the present study is consistent with the idea that AWC is depleted ata rate that bears some proportionality to the magnitude of the work raterequirement above CP (Fukuba et al., 2003; Jones et al., 2010). We concludethat prior exercise above CP produces a similar level of muscle fatigueindependent of the work rate performed when AWC is depleted at the same rate. ReferencesFukubaY, Miura A, Endo M, Kan A, Yanagawa K, Whipp BJ (2003). Med Sci Sports Exerc,35 (8), 1413-1418. JolmersonCarvalho1PauloCesar do Nascimento1JulianoFernandes da Silva2JulianoDal pupo1FrancimaraBudal Arins1LuizGuilherme Antonacci Guglielmo11Laboratorio deesforco fisico LAEF; Universidade Federal de Santa Catarina.2Universidade Federalde