Urban search and rescue operations are necessary to save victims trapped under rubble in structural collapse disasters. At confined-space-rescue sites, severe spatial and environmental conditions often hinder operations. To better prepare for disasters, we focused on the influence of space restrictions to (1) implement surveys on responders' body sizes through questionnaires and anthropometric measurements and (2) conduct an experiment on body movements in restricted spaces. Based on the results, threshold values at which rescue activity methods change were obtained, and are proposed as indices for effective training settings.