No abstract

Juránková, M., Bílý, J., & Hrazdíra, A. (2015). Effects of high-intensity strength interval training program on body composition. J. Hum. Sport Exerc., 9(Proc1), pp.S314-S319. The aim of this work was to examine effects of 10-week high-intensity strength interval training (HIIT) program on body composition. Seven women (31.0 ± 6.0 years old, 65.7 ± 9.8 kg body weight, 23.6 ± 2.8 kg*m−2 BMI, 18.6 ± 5.8 kg body fat, 26.0 ± 3.4 kg muscle mass) completed intervention program. We performed an analyze of body composition before and after training program. We focused especially on body fat and muscle mass. Each session consisted of short term bouts (until 30 s duration) with rest in ratio 2:1. HIIT itself lasted 15-20 min three times per week (30 trainings overall). The results showed that 10-week high-intensity strength interval training have nonsignificant positive effect on decrease of body fat and significant positive effect on increase of muscle mass. This result is unconvincing and it is appropriate to continue in research with more test subjects and more homogenic sample.

The effect of a cationic (CPS) and an anionic (SDS) surfactant on the bands in the absorption spectra of methyl red was studied. The interactions of methyl red with the two surfactants were monitored on the basis of the changes in the absorption curves that were mathematically deconvoluted into Gaussian shape absorption bands. The methyl red dissociation constants were determined in the presence of the two surfactants at sub-and supercritical micelle ooncentrations. The methyl red conditional dissociation constants changed by ApKa = -1'47 for c(CPS) = ~ 5 mmoll--1 and ApKa = 0'81 for c(SDS) = 4 mmoll-1 . The contributions of the individual forms of methyl red to the interactions with CPS and SDS were discus~ed.The extensive research carried out recently has confirmed the ability of surface active substances -surfactants -to affect the absorption electronic spectra of solutions of many dyes, including the triphenylmethane and azo dyes. This property has been utilized in spectrophotometric determinations of metal ions 1 -3 and for an improvement of spectral characteristics of the coloured system 4 -7 . Whereas the principles of the complex formation in the metal-dye binary system and of ion association followed by micelle solubilization in the metal-dye-surfactant ternary system have been studied in detail, the study and description of the mechanism of the interaction between the dye and the surfactant is being further object of interests 8 -11. Therefore, we have studied the acid-base and spectral characteristics of some analytically important chromogenic reagents and indicators 12 -15 in the presence of sub-and supercritical micelle concentrations of surfactants.The present paper deals with the effects of the cationic surfactant cetylpyridinium bromide (CPB) and the anionic surfactant sodium laurylsulphate (SDS) on the acid--base behaviour of methyl red (MR). The MR interaction with the surfactants was evaluated from the change in the absorption electronic spectra in the visible region, on the basis of a mathematical treatment of the absorption curves obtained (a separation of the spectral bands into independent Gaussian bands)16. The magnitude of these changes in the MR-CPB and MR-SDS systems was determined from the con-

The effect of the non-ionogenic surfactant Triton X-100 (TX) and β-cyclodextrin (CD) on the absorption bands of methyl red was examined. The interactions of methyl red with the both substances were studied based on changes in the absorption curves after their resolution into Gaussian bands. The conditional dissociation constants of methyl red were determined at various concentrations of the additives (in the case of TX, both below and above its cmc value). At cTX = 0.06 mol l-1 the change in the conditional dissociation constant of methyl red was ∆pKa = -0.58 and at cCD = 6 mmol l-1 the ∆pKa value was identical.

No abstract