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Table 4 Regression constants for each muscle for young and old group

From: Muscles adaptation to aging and training: architectural changes – a randomised trial

Muscles a b c d R2
Young Group
 VL − 2.6917 0.2544 2.4614 / 0.9661
 VI −1.5859 −1.4222 2.9428 / 0.9594
 VM 6.1739 −12.432 6.3191 / 0.951
 RF −4.5326 3.0291 1.4916 / 0.9757
 MG 3.1543 −5.3238 −1.563 3.6899 0.9457
 LG 13.251 −25.583 11.267 1.0653 0.9661
 Sol 9.2596 −14.119 1.4893 3.4211 0.9466
Old group a b c d R2
 VL −2.4881 −0.0495 2.5442 / 0.9634
 VI −1.4025 −1.7304 3.0576 / 0.9375
 VM 6.3957 −12.697 6.3731 / 0.9451
 RF −3.9678 2.2447 1.6946 / 0.9577
 MG 7.9128 −16.14 6.3253 1.8729 0.9727
 LG 10.614 −20.573 8.3903 1.5649 0.9584
 Sol 11.127 −18.016 4.0566 2.8921 0.9465
  1. Constants a,b,c refers to for 3rd polynomial equation:
  2. ax3 + bx2 + cx
  3. Constants a,b,c,d refers to for 4th polynomial equation:
  4. ax4 + bx3 + cx2 + dx