Figure 2.

Proposed model for analyzing physical activity level among volunteers with indirect (questionnaire) or direct (accelerometer) method in clinical trials for vaccines. (A) Assessment of volunteer’s level of physical activity by questionnaire. Researcher should apply the same questionnaire at least twice: at first dose and same day as last dose. (B) Evaluation of physical activity level by accelerometry. Researcher should proceed similarly to questionnaire method. If vaccine is single dose, second assessment of both cases must be carried out 30 days later. Accelerometer assessment requires several days.