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Hent hele bladet som pdf - Dansk Sportsmedicin

20

DIMS årsmøde

A2

THE EFFECT OF TRAINING ON ACHILLES APONEUROSIS PROPER-

TIES

Sofie Rosager, Per Aagaard, Michael Kjaer, S Peter Magnusson

Team Danmark Test Center/Sports Medicine Research Unit, Bispebjerg Hospital,

Copenhagen

INTRODUCTION: We measured the load-displacement and stress-strain

characteristics of the human triceps surae aponeurosis and tendon, in vivo,

during voluntary plantarflexion, in trained (n=7) and control (n=8) subjects.

METHODS: During a 10-s ramp isometric maximal plantarflexion simultaneous

and synchronous measures of real-time ultrasonography of aponeurosis

displacement, EMG of the gastrocnemius, soleus, and tibialis anterior

muscles, and joint angular motion were obtained. MRI was used to estimate

tendon CSA and moment arm. Force and EMG data from maximal isometric

dorsiflexion efforts were used to examine the effect of coactivity on the

mechanical properties. Tendon force was calculated from the measured joint

moment and tendon moment arm, and stress was obtained by dividing it

with CSA. Tendon strain was obtained from displacements normalized to

tendon length, and subsequently stiffness and Young’s modulus were calculated.

RESULTS: (meansem).

CSA,mm 2 Force N Displ, mm Strain, % Stress, MPa

Runner 925 2114456 8.71.6 3.60.7 224

Control 784 2095330 9.41.2 4.20.8 297

The stiffness was 40085 N/mm for controls and 28146 N/mm for runners.

The modulus was 74390 MPa for runners and 1131224 Mpa for controls.

Controls only differed from runners in CSA, P

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