First published in 2020, a paper documenting anatomical changes shows an increased prevalence of an additional artery in the forearm. Analysis of the literature showed that the presence of the median artery has been significantly increasing (p = .001) over time, from approximately 10% in people born in the mid-1880s to approximately 30% by the end ofContinue reading “ANATOMY CHANGES”
Category Archives: Manuals
CAMMING ACTION
The banner image shows a cam with a flat follower. Cams are used to convert rotary to linear motion. As the cam rotates, the follower rises and falls: Abrupt changes in the cam’s velocity results in large accelerations and cause the follower to jerk or chatter. In operating machinery, that is not a good thing, butContinue reading “CAMMING ACTION”
JO TORI
The jō 杖 (“wooden staff”) is a walking stick usually about four feet in length. It is unclear precisely how it became incorporated within Aikido. While some of the jō movements come from spear-fighting (yarijutsu 槍術), and others from staff-fighting (jō-jutsu 杖術 and bō-jutsu 棒術), many of them are most similar to the use of a bayonet (jūken-jutsu). Jō tori is takingContinue reading “JO TORI”
Protective Arts 