Sometimes affected dogs appear to be chewing gum due to the steady contractions of the muscles of the head. (vetinfo.com)
Researchers say this is because of the sustained contractions of the muscles in the neck, back and arms responsible for maintaining a rigid posture. (teachermagazine.com.au)
With improved posture and contraction of muscles during a massage session, oxygen intake improves. (azhealthyfamilies.org)