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

Abstract

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 41mLO 2 •kg -1 •min -1 or more= High Physical Fitness (HPF, n=5) and who achieve less than 41mLO 2 •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 HR max 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.Key words: Creatine kinase; High-intensity interval training; Myoglobin; Sodiun lactate. Resumo -O exercício intermitente de alta intensidade(HIIE) melhora a saúde e a aptidão cardiorrespiratória(CRF). HIIE pode ser aplicado com exercícios calistênicos para melhorar a força e resistência. Os efeitos agudos do treinamento de alta intensidade(HICT) considerando diferentes CRF em variáveis miológicas são desconhecidos. O objetivo foi medir os efeitos agudos do HICT em mulheres jovens, considerando diferentes níveis de CRF. Elas foram alocadas pelonível de VO 2 máx. em dois grupos, as que atingiram 41mLO2•kg -1 •min -1 ou mais= alta aptidão física(HPF,n=5) e menos de 41mLO2•kg -1 •min -1 = baixo aptidão física(LPF,n=7). Protocolo: 2x4 séries de 20s com intensidade máxima (all-out) intercalados com 10s de repouso passivo (jumping jacks, squat and thrust usando halteres 2kg, mountain climber e burpees). Sangue foi coletado antes, zero, 15, 30min, 1h e 24hs depois. Foram analisadas, freqüência cardíaca, mioglobina sérica, lactato e creatina quinase (CK). A FC alcançou 94,1±3,7% da FCmax para LPF e 104,5±20,3% para HPF, p=0,03. A média do delta lactato foi semelhante entre os grupos. O pico de mioglobina foi 1h após o protocolo de exercício, com 50.0±30.2ng/mL para LPF e 36.9±9.25ng/mL para HPF. O delta de CK total antes e depois do protocolo de exercício mostra que o nível sérico de CK no LP...

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