The influence of arm and shoulder position on the bear-hug, belly-press, and lift-off tests: an electromyographic study.
Pennock AT, Pennington WW, Torry MR, Decker MJ, Vaishnav SB, Provencher MT, Millett PJ, Hackett TR. The influence of arm and shoulder position on the bear-hug, belly-press, and lift-off tests: an electromyographic study. Am J Sports Med. 2011 Nov; 39(11):2338-46.