While the link between physical activity and acute growth
hormone response has been recognized since the 1960s, the results of analysis
such as that performed by Shaner and researchers in 2014 demonstrates a marked
increase over control subjects in hGH excitatory effect for exercises requiring
self-stabilization from the subject compared to exercises without that
requirement.
Further, a functional activity such as sprinting compared
with endurance focused running has been shown to attenuate a greater hGH
response of 82% and 231% in earlier analysis. Sprint type activity has been
established to recruit the afferent stabilizing
firing of muscle,
further suggesting an hGH axis and stability firing relationship.
The relationship between hGH levels and stabilization was
more precisely indicated by McCall, et al. where it was demonstrated that the
use of forced mechanical vibration to destabilize the tibialis anterior muscle
produces an increase in plasma levels of bio-assayable hGH.
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