Postural effects on the utilization of elastic strain energy and respiratory regulation

(1)The Forward-Leaning Posture to Maximize the Use of Elastic Energy
Strain energy is released when the deformed elastic elements of the body recover their resting lengths and original shapes. The stretch-shortening cycle of the Achilles’ tendon is succinctly exhibiting the mechanics of this catapult action, which spontaneously occurs to be utilized as initiatory impulses for various locomotor movements. Walking, skipping, running, and jumping are bipedal movements critically driven by elastic energy.
The relaxation of the diaphragm catalyzes expiration, and the body gradually becomes relaxed, from the pelvic floor muscles, and bent forward to the ground in the concentric phase of exhalation. The forward-leaning posture is achieved through this chain reaction at various degrees of torso angle, upon diverse stances. Furthermore, the storage of strain energy increases, as the muscle-tendon units of the posterior chain are stretched.
In the forward-leaning posture, the body is highly responsive to respiratory stimuli. The following are the two determinants that enhance the connectivity of the upper and lower body parts: (a)compressed abdominal muscles that cause deep expiration setting up a new respiratory and postural balance to be maintained by subsequent inspiration (b)the forefoot bearing the significant amount of body weight upon itself, sufficient to play as the primary base of support.


Exercise Physiology: Theory and Application to Fitness and Performance. S.K. Powers and E.T. Howley. 10th edition. McGraw Hill publishers

Anatomy & Physiology, Edited and Revised by Lindsay M. Biga, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Matern, Katie Morrison-Graham, Devon Quick, Jon Runyeon Art edited and created by Leeah Whittier
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