Validação de protocolo de análise de tempo-movimento no taekwondo

O objetivo do estudo foi avaliar a confiabilidade e a objetividade de um software para análise de tempo-movimento (ATM) e em ações técnico-táticas de taekwondo (TKD). Participaram da amostra 02 experts (A1 e A2), com mais de 10 anos de experiência, cada um observou 27 rounds, randomicamente escolhidos a partir de 350 rounds dos Campeonatos Mundiais de TKD 2011 e 2013. Calculou-se o  coeficiente de correlação intraclasse (CCI) e comparações pareadas foram conduzidas. Para cada variável, o CCI e os tempos (total; relativo, em segundos) encontrados foram: i) movimentação CCI=0,867 (A1=140,5±37,5s e A2= 151,3±32,8s; A1=5,8±2,3s e A2= 4,9±1,5s); ii) ataque/defesa CCI=0,793 (A1=18,4±18,3s e A2=12,8±15,9s; A1=1,3±1,3s e A2=1,3±1,8s); iii) contra-ataque CCI=0,999 (A1=7,0±13,1s e A2=6,7±13,0s; A1=1,9±4,1s e A2=1,8±3,8s), e; iv) pausa CCI=0,984 (A1=108,1±140,0s e A2=102,7±135,7s; A1=15,8±19,0s e A2=18,8±27,1s). Em conclusão, para ATM, os resultados mostraram forte concordância entre avaliadores, o que indica fidedignidade e objetividade do instrumento para análise temporal de lutas de TKD

Acute responses of high-intensity circuit training in women: Low physical fitness levels show higher muscle damage

High-intensity intermittent exercise (HIIE) elicits large improvements in health and cardiorespiratory fitness (CRF). HIIE can be applied with calisthenics exercises to improve strength and endurance. The acute effects of high-intensity circuit training (HICT) considering different CRF on myological variables are unknown. The aim was measure acute effects of HICT in young women considering different levels of CRF. Twelve women were allocated in two groups, who achieve 41mLO2•kg-1•min-1 or more= High Physical Fitness (HPF, n=5) and who achieve less than 41mLO2•kg-1•min-1= Low Physical Fitness (LPF,n=7). Protocol: 2x4 sets of 20 seconds at maximum intensity (all-out fashion) interspersed with 10 seconds of passive rest (jumping jacks, squat and thrust using 2kg dumbbells, mountain climber, and burpees). Blood samples were collected before, immediately after, 15minutes, 30minutes, one hour and 24 hours after. Heart rate, serum myoglobin, lactate, and creatine kinase (CK) concentration were analyzed. The HR achieved 94.1±3.7% of HRmax for LPF and 104.5±20.3% for HPF, p=0.03. The mean of delta lactate was similar between groups. The highest myoglobin has reached at 1h after the exercise protocol, with 50.0±30.2 ng/mL for LPF and 36.9±9.25 ng/mL for HPF. The delta of total CK before and after the exercise protocol shows that the serum CK level in LPF was significantly higher than HPF group (p=0.042). HICT composed by calisthenic protocol produced elevated and similar effects on HRmax, serum lactate and myoglobin in the woman with HPF and LPF. However, LPF group presented higher muscle damage inferred by serum CK concentrations