Normalising surface EMG of ten upper-extremity muscles in handcycling: Manual resistance vs. sport-specific MVICs |
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| Affiliation: | 1. Institute for Movement and Neurosciences, German Sport University Cologne, Cologne, North Rhine-Westphalia, Germany;2. Institute of Biomechanics and Orthopaedics, German Sport University Cologne, Cologne, North Rhine-Westphalia, Germany;3. Faculty of Medical Engineering and Technomathematics, University of Applied Sciences Aachen, Aachen, North Rhine-Westphalia, Germany;4. European Research Group in Disability Sport, Cologne, North Rhine-Westphalia, Germany;1. Université Côte d’Azur, LAMHESS, Nice, France;2. Université Côte d’Azur, Inria, Sophia Antipolis, France;3. Department of Sport Biomechanics and Technology, Sport Sciences Research Institute (SSRI), Tehran, Iran;4. Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran;5. Institut Universitaire de France (IUF), Paris, France;1. Brock University, St. Catharines, ON, Canada;2. Worcester Polytechnic Institute, Worcester, MA, USA;3. Wilfrid Laurier University, Waterloo, ON, Canada |
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| Abstract: | Muscular activity in terms of surface electromyography (sEMG) is usually normalised to maximal voluntary isometric contractions (MVICs). This study aims to compare two different MVIC-modes in handcycling and examine the effect of moving average window-size. Twelve able-bodied male competitive triathletes performed ten MVICs against manual resistance and four sport-specific trials against fixed cranks. sEMG of ten muscles [M. trapezius (TD); M. pectoralis major (PM); M. deltoideus, Pars clavicularis (DA); M. deltoideus, Pars spinalis (DP); M. biceps brachii (BB); M. triceps brachii (TB); forearm flexors (FC); forearm extensors (EC); M. latissimus dorsi (LD) and M. rectus abdominis (RA)] was recorded and filtered using moving average window-sizes of 150, 200, 250 and 300 ms. Sport-specific MVICs were higher compared to manual resistance for TB, DA, DP and LD, whereas FC, TD, BB and RA demonstrated lower values. PM and EC demonstrated no significant difference between MVIC-modes. Moving average window-size had no effect on MVIC outcomes. MVIC-mode should be taken into account when normalised sEMG data are illustrated in handcycling. Sport-specific MVICs seem to be suitable for some muscles (TB, DA, DP and LD), but should be augmented by MVICs against manual/mechanical resistance for FC, TD, BB and RA. |
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| Keywords: | Electromyography Handbike Maximal voluntary contraction Paralympic sport Muscular activity BB" },{" #name" :" keyword" ," $" :{" id" :" k0035" }," $$" :[{" #name" :" text" ," _" :" M. biceps brachii, Caput breve DA" },{" #name" :" keyword" ," $" :{" id" :" k0045" }," $$" :[{" #name" :" text" ," _" :" M. deltoideus, Pars clavicularis DP" },{" #name" :" keyword" ," $" :{" id" :" k0055" }," $$" :[{" #name" :" text" ," _" :" M. deltoideus, Pars spinalis EC" },{" #name" :" keyword" ," $" :{" id" :" k0065" }," $$" :[{" #name" :" text" ," _" :" M. extensor carpi ulnaris (forearm extensors) FC" },{" #name" :" keyword" ," $" :{" id" :" k0075" }," $$" :[{" #name" :" text" ," _" :" M. flexor carpi radialis (forearm flexors) ICC" },{" #name" :" keyword" ," $" :{" id" :" k0085" }," $$" :[{" #name" :" text" ," _" :" intraclass correlation coefficient LD" },{" #name" :" keyword" ," $" :{" id" :" k0095" }," $$" :[{" #name" :" text" ," _" :" M. latissimus dorsi MVIC" },{" #name" :" keyword" ," $" :{" id" :" k0105" }," $$" :[{" #name" :" text" ," _" :" maximal voluntary isometric contraction PM" },{" #name" :" keyword" ," $" :{" id" :" k0115" }," $$" :[{" #name" :" text" ," _" :" M. pectoralis major, Pars sternalis RA" },{" #name" :" keyword" ," $" :{" id" :" k0125" }," $$" :[{" #name" :" text" ," _" :" M. rectus abdominis SCI" },{" #name" :" keyword" ," $" :{" id" :" k0135" }," $$" :[{" #name" :" text" ," _" :" spinal cord injury TB" },{" #name" :" keyword" ," $" :{" id" :" k0145" }," $$" :[{" #name" :" text" ," _" :" M. triceps brachii, Caput laterale TD M. trapezius" },{" #name" :" keyword" ," $" :{" id" :" k0155" }," $$" :[{" #name" :" text" ," _" :" Pars descendens |
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