File:PEM-types-of-exertion.jpg

Title: (or description)
Three types of exertion found to cause post-exertional malaise.

Author: (or citation)
Stussman B, Williams A, Snow J, Gavin A, Scott R, Nath A and Walitt B (2020) Characterization of Post–exertional Malaise in Patients With Myalgic Encephalomyelitis/Chronic Fatigue Syndrome. Front. Neurol. 11:1025. doi: 10.3389/fneur.2020.01025

Source: (e.g. internet address)
https://www.frontiersin.org/articles/10.3389/fneur.2020.01025/full