1. Intensity and duration threshold for aerobic exercise-induced analgesia to pressure pain1 
Martin D Hoffman, MD, Melissa A Shepanski, MS, Stephen B Ruble, PhD, Zoran Valic, MD, John B Buckwalter, PhD, Philip S Clifford, PhD 
Archives of Physical Medicine and Rehabilitation 
Volume 85, Issue 7, Pages (July 2004)
DOI: /j.apmr

2. Fig 1
Example of pressure-pain ratings for a single subject at each 10-second interval before (Pre), 5 minutes after (Post 5), and 30 minutes after (Post 30) exercising for 30 minutes at 75% V̇o2max.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )

3. Fig 2
Summary of pain ratings to pressure stimulus before exercise, 5 minutes after, and 30 minutes after exercise for 3 different exercise conditions. Whiskers represent 1 standard error. ∗Significantly different (P<.05) from baseline.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )