ABSTRACT
@#The Bajaus’ ability to free dive for prolonged periods is attributed to their exceptional physiologic response and large spleens. The spleen has been traditionally viewed as a hematologic and immunologic organ. Unconventionally, this review explores the spleen’s role as a respiratory organ and how apnea training can enhance the spleen’s form and function. Eligible articles obtained from Pubmed were discussed. The selected studies have shown that an 8-week home-based apnea training regimen can enhance the spleen volume by as much as 24% and that prolonged apnea training can increase both splenic contraction and baseline serum hemoglobin levels. However, the sample size and heterogeneity of these studies largely limit the generalizability of these findings. Thus, several future studies are needed to further explore the spleen’s respiratory function in humans.