4.3. Limitations of the Study
infection, coronavirus infection
CORONAVIRUS, INFECTION, RECRUITMENT, CORONAVIRUS INFECTION
This study had a relatively short intervention period of 12 weeks. The social impact of the novel coronavirus infection forced us to postpone the start of the intervention study and shorten the intervention period. The effects of the new coronavirus infection continue to make it challenging to conduct interventional studies. Therefore, it is necessary to further examine the setting of intervention periods based on previous studies. Hence, further research on the effects of long-term interventions is warranted.Recruitment was challenging due to the social impact of the new coronavirus infection. Undeniably, the study participants were biased by their interest in healthy exercise and maintenance of daily physical activity. Additionally, a few participants wished to discontinue their participation in the health exercise classes because of objections from their family members regarding their continued participation in the classes from the perspective of infection prevention. Regarding the health class operation, we made every effort to take all possible sanitary measures to dispel the participants’ concerns. However, the situation was severe. Again, we felt that conducting intervention research during a novel coronavirus pandemic was difficult.Regarding the study content, the E-group solely participated in unregulated healthy exercise classes without incorporating any other form of physical activity or exercise. Similarly, the C-group adhered to their regular lifestyle without any exercise or physical activity regulations. For both groups, more accurate results could have been obtained by adding a measurement component, like physical activity and exercise practice during the intervention period, using accelerometers and physical activity questionnaires.