Medical Journal of the Islamic Republic Of Iran
مجله پزشکی جمهوری اسلامی ایران
Med J Islam Repub Iran
Medical Sciences
http://mjiri.iums.ac.ir
2
journal2
1016-1430
2251-6840
8
10.18869/mjiri
14
8888
13
en
jalali
1392
10
1
gregorian
2014
1
1
28
1
online
1
fulltext
en
Effect of eccentric exercise-induced muscle damage on electro-myographyic activity of quadriceps in untrained healthy females
Physical Therapy
Physical Therapy
Original Research
Original Research
<p> <strong> Background: </strong>The aim of this study was to investigate muscle damage indicators and electromyography activities of quadriceps muscles at 25° of hip flexion in untrained healthy females after an eccentric exercise induced muscle fiber damage. </p><p> <strong> Methods </strong>: A total of 14 healthy females participated in this pre-experimental study. The subjects performed maximal eccentric quadriceps contractions at 25˚ of hip flexion. Maximum voluntary extensor isometric and concentric moments, angle of maximum moment for concentric contractions, perceived pain intensity, and pain pressure threshold were examined before, immediately, 48 hours, 120 hours and 14 days after eccentric exercise. Additionally, electromyography of three parts of quadriceps muscle, knee flexion range of motion and thigh circumference were measured before and after eccentric exercise. </p><p> <strong> Results </strong>: Significant reductions in maximum isometric moment and maximum concentric moment were observed at angular velocity of 60˚ per sec immediately after eccentric exercise (p<0.05). Both maximum isometric moment and maximum concentric moment recovered to the baseline 48 hours after eccentric exercise. Increased pain intensity and decreased knee joint range of motion manifested 48 hours after eccentric exercise. Pain pressure threshold for the quadriceps was higher 14 days after exercise as compared to 48 and 120 hours (p<0.05). No significant changes observed in electromyography and thigh circumference (p>0.05). </p><p> <strong> Conclusion </strong>: Eccentric exercise performed at 25˚ of hip flexion resulted in muscle fiber injuries within the quadriceps muscle. However, electromyography of quadriceps muscle was not significantly different than the baseline. The result indicates that hip joint position may modify the effect of eccentric exercise on muscle activation. </p><p> <strong> </strong></p>
Muscles, electromyography, hip, muscle soreness, exercise.
1035
1042
http://mjiri.iums.ac.ir/browse.php?a_code=A-10-1-764&slc_lang=en&sid=1
Mandana
Rezaei
mandana.rezae@gmail.com
200319475328460014518
200319475328460014518
No
School of Rehabilitation, Tabriz University of Medical Sciences, Tabriz, Iran.
Ismael
Ebrahimi- Takamjani
ebrahimi.pt@gmail.com
200319475328460014519
200319475328460014519
Yes
School of Rehabilitation, Iran University of Medical Sciences, Tehran, Iran, Rehabilitation Research Center, Biomechanics Lab, Iran University of Medical Sciences, Tehran, Iran.
Ali A.
Jamshidi
aliajamshidi@yahoo.com
200319475328460014520
200319475328460014520
No
School of Rehabilitation, Iran University of Medical Sciences, Tehran, Iran, Rehabilitation Research Center, Biomechanics Lab, Iran University of Medical Sciences, Tehran, Iran.
Behnoush
Vassaghi-Gharamaleki
vasaghib@tums.ac.ir
200319475328460014521
200319475328460014521
No
School of Rehabilitation, Iran University of Medical Sciences, Tehran, Iran, Rehabilitation Research Center, Biomechanics Lab, Iran University of Medical Sciences, Tehran, Iran.
Nosratollah
Hedayatpour
nhedayatpour@yahoo.com
200319475328460014522
200319475328460014522
No
Department of Physical Education and Sport Science, University of Bojnord, Bojnord, Iran.
Naser
Havaei
naser_havaei@yahoo.com
200319475328460014523
200319475328460014523
No
Department of Occupational Therapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran.