Journals of Gerontology Series A: Biological Sciences and Medical Sciences Large Type Edition
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The Journals of Gerontology Series A: Biological Sciences and Medical Sciences 59:B441-B448 (2004)
© 2004 The Gerontological Society of America

Gender Differences in Human Muscle and Joint Mechanical Properties During Plantar Flexion in Old Age

Julien Ochala1,, Denis Valour1, Michel Pousson1, Daniel Lambertz2 and Jacques Van Hoecke1

1 Equipe Motricité-Plasticité, Faculté des Sciences du Sport, Université de Bourgogne, Dijon, France.
2 Département de Génie Biologique, Université de Technologie, Compiègne, France.

Address correspondence to Julien Ochala, Equipe INSERM-ERM 207 Motricité-Plasticité, Faculté des Sciences du Sport, Université de Bourgogne, BP 27 877, 21 078 Dijon Cedex, France. E-mail: julien.ochala{at}u-bourgogne.fr

Muscle and joint mechanical properties during plantar flexion were investigated in 13 elderly women (EW) (age range 73–83 years) and 15 elderly men (EM) (age range 74–81 years). Maximal torque, at several angular velocities, was measured to construct torque–velocity relationship. This led to the calculation of an index of maximal shortening velocity (VImax) at 10% of maximal isometric torque. Two methods were then used to calculate musculotendinous (quick-release movements) and musculoarticular (sinusoidal perturbations) stiffness. In both cases, stiffness was linearly related to torque, and the slope was defined as a stiffness index (SI): SIMT and SIMA, respectively. Maximal torques as well as VImax (p <.05) were lower in EW compared with EM. Furthermore, SIMT and SIMA values were higher for EW than for EM (p <.05). These results are interpreted in terms of possible differences in the muscle mass, fiber-type distribution, and tendons. They may also have implications for daily motor behavior.






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