The Effect Of Moderate Intensity Continuous And High Intensity Interval Exericise On Qtc、blood Pressure And Trailing Adaptation In Obese Young Women

The traditional way to lose weight is using moderate persistent aerobic exercise,numerous studies have shown that this kind of exercise can effectively reduce body fat andimprove aerobic fitness, while some limitations are existed, such as the sport time is too long,and it is monotonous.Recent studies have shown that high-intensity interval exercise can effectively reducebody fat, improve aerobic endurance, and save exercise time. However, there is controversyabout the security risks. There is a lack of research about the security of obese people onhigh-intensity interval exercise. Furthermore, this kind of exercise involves high-intensityexercise; the acceptability of obese people needs to be explored.Research purpose: continuous endurance exercise training and high intensity intervalexercise training are adopted, observing the quiet state, ECG and blood pressure of obeseyoung women before and after exercise period to discuss the safety of the two forms ofexercise. At the same time, observation of the acceptability of obese people for high intensityinterval exercise is carried on through the evaluation of physical fun and assessment ofsubjective sensation.Research methods:48obese young women (age21.0±1.3years) were randomly dividedinto three groups: high-intensity interval training group (High Intensity Interval Training,HIIT), moderate-intensity continuous training group (Moderate Intensity Continuous Training,MICT) and the control group (CON). Interventions are conducted to the two exercise groups,HIIT group performed treadmill exercise with90%VO2max on power bicycle,4minutesexercise and4minutes intermittent break. MICT group performed continuous treadmillexercise with60%VO2max. CON group did not exercise. Two group exercises lasts for12weeks,3-4times per week, keeping the mechanical work equal between groups. During theintervention, three groups of subjects maintain usual diet and daily physical activity. Intervalmeasurement of weight, fat%, VO2max, blood pressure, and QTc are conducted before andafter the intervention. Monitoring and evaluation of HR, RPE and PAES are conducted duringthe intervention period. Research results:(1) VO2max level is increased by13.7%and12.8%(P <0.01) of HIIT and MICTcompared with the ones before training, and body fat (P <0.05) of both groups aresignificantly reduced, but no statistical difference between two groups;(2) Compared with MICT group, sport fun of HIIT group is more (P <0.05).(3) After12weeks of exercise intervention, systolic blood pressure and diastolic bloodpressure on quiet state of HIIT and MICT group are significantly decreased(P <0.05), there isno significant difference between the two groups. HIIT and MICT acute exercise can causeimmediate post-exercise systolic blood pressure to rise, increasing average26±13mmHg.HIIT acute exercise can lead to a significant rise in diastolic blood pressure,（11±10） whileno significant changes after MICT exercise. Training has no significant effect on immediateblood pressure level. For adaptive changes in blood pressure in acute exercise recoverysession, MICT is superior to HIIT.(4) Before and after QTc interval training, there is no significant change between HIIT,MICT and CON group. HIIT and MICT acute exercise can lead to extension of QTc, and twoways of training can significantly reduce the QTc extended range and speed up recovery afterexercise, but HIIT is superior to MICT.Conclusions:(1) Both HIIT and MICT can help obese young women improve the aerobic ability andreduce the level of body fat after12weeks.(2) Compared with the group of MICT, subjects in HIIT group hold the view that the funproduced by high intensity and intermittent exercise is stronger, and they are more easy andhappy to accept this sport; mict group think continuous movement takes too much time,which let them lack power of athletics.(3) HIIT and MICT acute exercise can result in raising immediate systolic pressure anddiastolic pressure after sport, but the range is small, which explain the possibility of a sharprise in blood pressure caused by this two movement forms is seldom. The two movementforms also decreased significantly static blood pressure after12weeks.(4) HIIT and MICT acute exercise can result in lengthening Qtc, which indicate that itcan increase potentially danger of arrhythmias. But the two forms can significantly decreased the extended range of Qtc and accelerate recovery after exercise after12weeks, however, theresult that HIIT is more better than MICT indicate HIIT training is safer than MICT fromthe angle of electrocardiogram transmission stability.