caa a22 4500 467941688 CHVBK 20180406153014.0 cr unu---uuuuu 170328e20060801xx s 000 0 eng 10.1007/s00421-006-0232-7 doi (NATIONALLICENCE)springer-10.1007/s00421-006-0232-7 Effects of neuromuscular electrical stimulation parameters on specific tension [Elektronische Daten] [Ashraf Gorgey, Edward Mahoney, Tracee Kendall, Gary Dudley] This study examined the effects of altering surface neuromuscular electrical stimulation (SNMES) parameters on the specific tension of the quadriceps femoris muscle. Seven able-bodied subjects had magnetic resonance images taken of both thighs prior to and immediately after four SNMES protocols to determine the activated muscle cross-sectional area (CSA). The four protocols were: (1) research (RES, 100Hz, 450μs, and amplitude set to evoke 75% of maximal voluntary isometric torque, MVIT); (2) pulse duration (PD, 100Hz, 150μs, same current as in RES); (3) frequency (FREQ, 25Hz, 450μs, and same current as in RES); (4) amplitude (AMP, 100Hz, 450μs, and current set to evoke the average of the initial torques of PD and FREQ, 45±9% of MVIT). Reducing the amplitude of the current from 75 to 45% of MVIT did not alter specific tension, 25±8N/cm2, suggesting that the amplitude probably affects torque and the area of activated muscle proportionally. Shortening the pulse duration from 450 to 150μs caused specific tension to drop from 25±6 to 20±6N/cm2 (P<0.05), indicating that pulse duration increased torque and the activated CSA disproportionally. Alternatively, reducing the frequency from 100 to 25Hz decreased specific tension from 25±6 to 17±4N/cm2 (P<0.05), suggesting that the frequency increased torque without affecting the activated CSA. Clinicians who administer SNMES should be aware of the magnitude of adaptations to a given amplitude, pulse duration, and frequency. Springer-Verlag, 2006 Electrical stimulation nationallicence Amplitude nationallicence Frequency nationallicence Pulse duration nationallicence Specific tension nationallicence Gorgey Ashraf Department of Physical Medicine and Rehabilitation, University of Michigan, 325 E Eisenhower, 48108, Ann Arbor, MI, USA aut Mahoney Edward Department of Kinesiology, The University of Georgia, 300 River Road, Ramsey Center, 30602, Athens, GA, USA aut Kendall Tracee Department of Kinesiology, The University of Georgia, 300 River Road, Ramsey Center, 30602, Athens, GA, USA aut Dudley Gary Department of Kinesiology, The University of Georgia, 300 River Road, Ramsey Center, 30602, Athens, GA, USA aut European Journal of Applied Physiology Springer-Verlag 97/6(2006-08-01), 737-744 1439-6319 97:6<737 2006 97 421 https://doi.org/10.1007/s00421-006-0232-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-006-0232-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gorgey Ashraf Department of Physical Medicine and Rehabilitation, University of Michigan, 325 E Eisenhower, 48108, Ann Arbor, MI, USA aut NATIONALLICENCE 700 1- Mahoney Edward Department of Kinesiology, The University of Georgia, 300 River Road, Ramsey Center, 30602, Athens, GA, USA aut NATIONALLICENCE 700 1- Kendall Tracee Department of Kinesiology, The University of Georgia, 300 River Road, Ramsey Center, 30602, Athens, GA, USA aut NATIONALLICENCE 700 1- Dudley Gary Department of Kinesiology, The University of Georgia, 300 River Road, Ramsey Center, 30602, Athens, GA, USA aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 97/6(2006-08-01), 737-744 1439-6319 97:6<737 2006 97 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer