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In the quadriceps muscles, architecture and volume measurements were combined to obtain physiological CSA (PCSA), and maximal isometric force was recorded. Following training, muscle force and PCSA increased by 31% ( P &lt; 0.0001) and 7% ( P &lt; 0.01), respectively. Tendon CSA increased regionally at 20\u201330%, 60%, and 90\u2013100% of tendon length (5\u20136%; P &lt; 0.05), and tendon stiffness and modulus increased by 24% ( P &lt; 0.001) and 20% ( P &lt; 0.01), respectively. Although none of the tendon adaptations were related to strength gains, we observed a positive correlation between the increase in quadriceps PCSA and the increases in tendon stiffness ( r = 0.68; P &lt; 0.01) and modulus ( r = 0.75; P &lt; 0.01). Unexpectedly, the increase in muscle PCSA was inversely related to the distal and the mean increases in tendon CSA (in both cases, r = \u22120.64; P &lt; 0.05). These data suggest that, following short-term resistance training, changes in tendon mechanical and material properties are more closely related to the overall loading history and that tendon hypertrophy is driven by other mechanisms than those eliciting tendon stiffening.<\/jats:p>","DOI":"10.1152\/japplphysiol.00213.2009","type":"journal-article","created":{"date-parts":[[2009,5,29]],"date-time":"2009-05-29T01:51:13Z","timestamp":1243561873000},"page":"523-530","source":"Crossref","is-referenced-by-count":218,"title":["Training-induced changes in structural and mechanical properties of the patellar tendon are related to muscle hypertrophy but not to strength gains"],"prefix":"10.1152","volume":"107","author":[{"given":"O. R.","family":"Seynnes","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R. M.","family":"Erskine","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C. 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