The Effectiveness and Safety of HIIT in Overweight Male Subjects

• Subjects are recruited via e-flyer distributed online across university departments. Individual who is interested in study participation fills out screening form. Research assistants screen subjects eligibility. Subjects are coded based on the order of screening form fulfillment.
• Research assistants are using the standard operational procedures for each assessments. Training for the research assistants precedes the data collection to ensure the similarity of understanding and skills during measurements. One research assistant responsible for scheduling the assessments and training sessions. Continuous evaluation are planned weekly to provide room for improvements in the process of data collection.
• Sample size assessment is measured from 5 primary output by a research assistants using sample size calculation website for single intervention clinical trial.
• Investigator use paper based data collection for each assessment and during training sessions. Subject are encouraged to report any symptoms and signs during intervention period in each meeting with the research assistants or via online messaging. Any reports will be documented in separated form. One research assistant makes sure the data fields are completed in each measurements and during training sessions. The assistant also check the similarity of the data entered in the master table.
• Data analysis will be lead by one research assistant using newest version of SPSS software. The analysis will be started after the baseline measurement is completed although the data collection is not finished. All numeric data will be presented as mean and standard deviations if normally distributed or median and minimum maximum range if not normally distributed. Paired t-test will be used to identify the difference before and after the intervention if the data are normally distributed. If the data are not normally distributed, Wilcoxon test will be used to identify the difference before and after the intervention.

To ensure that there is no missing data, the research assistant who responsible for data completeness will perform daily checking. Any missing data will be stated and immediately completed. Research assistants will provide close supervision for each subject to ensure the delivery of all necessary reports.

Inclusion criteria

• overweight (BMI 25 - 29,9)
• live in Jakarta and greater area
• willing to participate

Exclusion criteria

• smoking
• any medical health problems (epilepsy, cardiovascular disease, kidney and liver problems, history of fractures, tendon and ligament injuries)