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In this study, we propose the hypothesis that there is a significantdifference in thermal cycling fatigue resistance between the bones ofectothermic and endothermic animals. We performed an experiment to test whetherbones of endothermic animals, having potentially lost their ability to adapt tothermal cycling, exhibit reduced resistance to thermal fatigue compared toectothermic animals, which may have retained this adaptive trait due to theirenvironmental conditions. The change in stiffness were determined using shiftsin the resonant peaks of the frequency spectrum obtained from ResonantUltrasonic Spectroscopy (RUS). To achieve this, samples of compact (cortical)and spongy bone tissue were extracted and polished before undergoing a 29-dayperiod of thermal cycling. The changes in the resonance frequencies were thenobserved. Changes in resonant frequencies imply corresponding changes inelastic constants. The primary findings indicated that bones from ectothermicspecies exhibited minimal changes in elastic properties compared to those fromendothermic species, as evidenced by the smaller shifts in resonant peakmagnitudes following thermal cycling.

Thermoregulation Variation in Vertebrates Reveals Differences in Thermal Fatigue Resistance of Bones