MikeT - Sorry about the wait...

It's actually from a recent(ish) systematic review of tendon loading protocols by Malliaras et al.
Malliaras P, Barton CJ, Reeves ND, Langberg H: Achilles and Patellar Tendinopathy Loading Programmes. Sports Medicine. 2013:1-20.

publicly available pdf is here....
http://physiovelo.com/wp-content/upl...mes.pdf?x12367