caa a22 4500 467940029 CHVBK 20180406153009.0 cr unu---uuuuu 170328e20061201xx s 000 0 eng 10.1007/s00421-006-0311-9 doi (NATIONALLICENCE)springer-10.1007/s00421-006-0311-9 Changes in muscle strength and EMG median frequency after anterior cruciate ligament reconstruction [Elektronische Daten] [Wendy Drechsler, Mary Cramp, Oona Scott] The purpose of this study was to monitor neuromuscular changes in quadriceps femoris muscle at 1 and 3months after anterior cruciate ligament reconstruction (ACLR). Changes in isometric muscle strength (MVC), voluntary activation and surface electromyogram (EMG) parameters were examined in relation to knee stability, pain and swelling in 31 patients (25 M, 6 F) mean (SD) 30(8) years. Physically inactive (RC) and sports participants (SC) acted as controls. Median frequency (Hz) and amplitude (mV) of rectus femoris using Fast Fourier Transform (FFT) 211 was calculated during 5-s isometric contractions at 100, 75, 50 and 25% of MVC. One month after surgery, a significant correlation (P<0.01) was found between activation (%) and MVC of injured knee extensors. By 3months, most patients were pain free and had achieved full activation but still had muscle weakness. At 1 and 3months post-surgery and for all levels of MVC contraction, the median frequencies of the injured limbs were significantly lower (P<0.05) compared to the SC group as were those of the RC group. There was a significant lowering of the median frequencies of the uninjured limbs compared to the SC group at 75 and 100% of MVC. The EMG amplitude of the uninjured and injured limbs mirrored those of the SC and RC groups, respectively. These results support the view that muscle activation patterns were altered following ACL injury and surgical repair and may contribute to subsequent changes in muscle fibre properties during detraining and subsequent retraining. Springer-Verlag, 2006 ACLR nationallicence Muscle strength nationallicence Motor unit recruitment nationallicence EMG nationallicence Median frequency nationallicence Drechsler Wendy School of Health and Bioscience, University of East London, Romford Road, Stratford, E15 4LZ, London, UK aut Cramp Mary School of Health and Bioscience, University of East London, Romford Road, Stratford, E15 4LZ, London, UK aut Scott Oona School of Health and Bioscience, University of East London, Romford Road, Stratford, E15 4LZ, London, UK aut European Journal of Applied Physiology Springer-Verlag 98/6(2006-12-01), 613-623 1439-6319 98:6<613 2006 98 421 https://doi.org/10.1007/s00421-006-0311-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-006-0311-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Drechsler Wendy School of Health and Bioscience, University of East London, Romford Road, Stratford, E15 4LZ, London, UK aut NATIONALLICENCE 700 1- Cramp Mary School of Health and Bioscience, University of East London, Romford Road, Stratford, E15 4LZ, London, UK aut NATIONALLICENCE 700 1- Scott Oona School of Health and Bioscience, University of East London, Romford Road, Stratford, E15 4LZ, London, UK aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 98/6(2006-12-01), 613-623 1439-6319 98:6<613 2006 98 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer