Figure 3: Trunk blood ACTH and corticosterone levels. Mean (± SEM) ACTH (panel A) and corticosterone (panel B) immunoreactivity levels are presented. Chronic noise exposure was associated with a significant increase in mean values of corticosterone using log transformed data, relative to both sham and control groups, assessed separately. ^*P < 0.05. ACTH = adrenocorticotropic hormone, ir = immunoreactive