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The Journal of Sports Medicine and Physical Fitness 2002 September;42(3):289-94

EXERCISE PHYSIOLOGY AND BIOMECHANICS 

 Original articles

Effects of lower limbs muscular fatigue on anticipatory postural adjustments during arm motions in humans

Vuillerme N., Nougier V., Teasdale N. *

From the Labor­a­toire ­Sport et Per­for­mance ­Motrice Université ­Joseph Fouri­er-Gren­o­ble 1 Gren­o­ble, ­France
*Labor­a­toire de Per­for­mance ­Motrice ­Humaine Université ­Laval, Qué­bec, Can­a­da

Back­ground. The pur­pose of the ­present experi­ment was to exam­ine the ­effects of low­er ­limbs mus­cu­lar ­fatigue on the antic­i­pa­to­ry pos­tu­ral adjust­ments dur­ing a vol­un­tary arm rais­ing move­ment.
Meth­ods. ­Eight ­adult ­males (­mean age 29±6 ­years) vol­un­tar­i­ly par­tic­i­pat­ed to the experi­ment. ­Subjects’ ­task con­sist­ed in per­form­ing an uni­lat­er­al ­ante-flex­ion of the ­right arm ­over 90 deg, hold­ing a 500 g ­weight, ­once hav­ing sta­bi­lized ­their ­upright pos­ture. A sim­i­lar move­ment exe­cu­tion was ­required. Meas­ure­ments ­were ­made in a no-­fatigue sit­u­a­tion and ­under a ­high lev­el of ­fatigue of low­er ­limbs. Sur­face EMG of ­four pos­tu­ral mus­cles (the ipsi­lat­er­al and con­tra­lat­er­al Gas­troc­ne­mi­us and the ipsi­lat­er­al and con­tra­lat­er­al Sem­i­ten­di­no­sus) and of one mus­cle ­involved in the arm rais­ing (the Ante­ri­or ­Deltoïdeus of the ­right arm) was record­ed. ­Body ­sway was ­also mon­i­tored ­using a ­force plat­form.
­Results. ­With ­fatigue, quan­ti­ta­tive EMG anal­y­sis ­showed a ­decrease of the ipsi­lat­er­al Sem­i­ten­di­no­sus activ­ity where­as the tem­po­ral EMG anal­y­sis ­showed an ­increase of its laten­cy ­with ­respect to move­ment ­onset.
Con­clu­sions. ­These ­data sug­gest­ed a func­tion­al adap­ta­tion result­ing in an invar­i­ance of glo­bal antic­i­pa­to­ry pos­tu­ral adjust­ments for the two con­di­tions of no-­fatigue and ­fatigue and ensur­ing an ade­quate exe­cu­tion of the move­ment.

language: English


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