Case reports indicate that high levels of testosterone or synthetic derivatives of testosterone may enhance the risk of tendon and ligament injuries [95–98].
Furthermore, analysis of human patellar tendon morphology and mechanical properties indicates that adaptation to strength training is influenced by long-term use of androgenic anabolic steroids [99].
This is supported by animal data which suggests that anabolic androgenic steroids reverse the beneficial effect of exercise on Achilles tendon adaptation, thus resulting in inferior maximal stress values [100].
The higher risk of tendon rupture in anabolic steroid users may be directly caused by a direct effect on tendon or may also be indirectly related to the enhanced muscle hypertrophy and gain in muscle strength which is not balanced by a similar degree of adaptation in the connected tendon [101, 102].
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98. Kanayama G, DeLuca J, Meehan WP 3rd et al (2015) Ruptured tendons in anabolic-androgenic steroid users: a cross-sectional cohort study. Am J Sports Med 43:2638–44.
99. Seynnes OR, Kamandulis S, Kairaitis R et al (2013) Effect of androgenic-anabolic steroids and heavy strength training on patellar tendon morphological and mechanical properties. J Appl Physiol (1985) 115:84–9.
100. Tsitsilonis S, Chatzistergos PE, Mitousoudis AS et al (2014) Anabolic androgenic steroids reverse the beneficial effect of exercise on tendon biomechanics: an experimental study. Foot Ankle Surg 20:94–9.
101. Bhasin S, Storer TW, Berman N et al (1996) The effects of supraphysiologic doses of testosterone on muscle size and strength in normal men. N Engl J Med 335:1–7.
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Hansen M, Kjaer M. Sex Hormones and Tendon. Advances in experimental medicine and biology 2016;920:139-49. Sex Hormones and Tendon In Metabolic Influences on Risk for Tendon Disorders. Editors Ackermann PW, Hart DA. Metabolic Influences on Risk for Tendon Disorders | SpringerLink