
A study was conducted to show that in strenuous activities,
bone tensions in the unexhausted state may increase beyond intended levels. To
test this hypothesis, this survey was conducted on 4 volunteers to quantify the
tibial strains, the most extreme isokinetic pair of the gastrocnemius, and the
ground reaction forces at two strenuous levels of activity: a 2km run and a
30km walk in the desert. The strains were estimated using stump test clips
which were incorporated percutaneously into the midsection of their diaphysis
in the middle of the tibia. The isokinetic torque of each of the four
volunteers after walking showed a significant decrease in the maximum
isokinetic torque of the gastrocnemius compared to the pretest, which showed
the proximity of the exhaustion of the gastrocnemius muscle. The pressure load
increased after the race by 26% and after the race by 29% in contrast to the
phase before the race. Compressive stress rates increased 13% after stroke and
11% after walking, and compressive stress rates increased 9% after stroke and
17% after walking. The state of fatigue increases bone tensions compared to
those of the dormant population and could play an important role in the
etiology of the tear under pressure. (Milgrom C. Radeva-Petrova, D. Finestone,
A. Nyska M. Mendelson, S. Benjuya, N. Simkin, A. Burr, D. The Influence of
Muscle Fatigue on In Vivo Tibial Stretching Journal of Biomechanics 40 (4):
845-50, 2007.
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