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فهرست مقالات

The Center of Mass Oscillations in Parkinson Patients


(4 صفحه - از 93 تا 96)

خلاصه ماشینی:

"c om ISSN (Online): 2322 – 4479 Comparisons of EMG Activity of Rectus Femoris and Vastus Medialis in Different Phases of Squat 1Sepide Khamoushi∗ ,2Nader Farahpour, 3Shirin Yazdani 1. Department of Physical Education and Sport Science, Tabriz University, Tabriz, Iran INTRODUCTION Information obtained from muscle EMG may help us to evaluate muscle activity, effectiveness of a specific rehabilitation program, as well as for understanding the injury mechanism(3). The objective of this study was to assess the EMG activity of vastus medialis and rectus femoris muscles during their concentric and eccentric contractions. EMG activity of vastuslateralis and rectus femuris muscles were digitized during squat performance with a load equal to 45% of body mass. The intensity of muscle activity was shown in two phases sitting (eccentric contraction) and standing (concentric contraction) in squat exercise. CONCLUSIONS The activity of vastus medialis in standing phase was significantly greater than that of the rectus femoris muscle(1,4)."

صفحه: از 93 تا 96
93 Annals of Applied Sport Science , Spring 2015, Volume 3 - Number 9

94 Annals of Applied Sport Science , Spring 2015, Volume 3 - Number 9

includes were parts of‌ the‌ forearm‌ and hand, arm, head, trunk, thighs, shank and foot(2). COM of each section determined using anthropometric tables. Then the whole body‌ COM‌ determined‌ was using two formulas in two axes X and‌ Y. ANOVA‌ statistical methods (p<0/05) used for data analysis.


Significant differences found in relation to the whole body COM‌ oscillations‌ in‌ any of the two axes X and Y.


The results showed‌ that the COM oscillations upper limb (forearm and hand, arm, head, trunk) in both axes X and Y in all‌ subjects‌ is‌ more than the lower limbs (thigh, shank, foot), Also is consistent‌ with‌ Research findings on lower limb that the COM oscillations upper limbs is more than the lower‌ limbs‌ (2, 3). The‌ results showed that most oscillations in the COM exist in forearm and‌ hand‌ and‌ foot lowest ranked. The whole body COM oscillations are in all subjects to the‌ anterior‌ - posterior‌ (X) for most of the medial - lateral (Y).


1. Konczak J, Corcos DM, Horak F, Poizner H, Shapiro M, Tuite‌ P, et‌ al. Proprioception and motor control in

Parkinson's disease. Journal of Motor Behaviour 2009‌; 41‌(6): 543‌-552.

2. William H, Winter D, James S. Kinematics and kinetic validity of the inverted pendulum model in‌ quiet‌ standing.

Gait and Posture 2004; 19: 124 – 132.

3. Kejonen P, Kauranen K, Vanharanta H. Body movements‌ in‌ postural‌ balance with motion analysis. Journal

Physical medicine Rehabilitation 1998; 2(8): 39 – 43.

95 Annals of Applied Sport Science , Spring 2015, Volume 3 - Number 9

96 Annals of Applied Sport Science , Spring 2015, Volume 3 - Number 9