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Systematic reduction of leg muscle activity throughout a standard assessment of running footwear

Journal of Sport and Health Science 2022年第3期11卷 309-318页

作者： Maurice Mohr vinzenzvon tscharner Sandro Nigg Benno M.Nigg Department of Sport Science University of InnsbruckInnsbruck 6020Austria Human Performance Laboratory Faculty of KinesiologyUniversity of CalgaryCalgaryAB T2N 1N4Canad

Purpose This study aimed to investigate whether there is a systematic change of leg muscle activity,as quantified by surface electromyography(EMG),throughout a standard running footwear assessment protocol at a predetermined running *** Thirty-one physically active adults(15 females and 16 males)completed 5 testing rounds consisting of overground running trials at a speed of 3.5 m/*** level of muscle activity from 6 major leg muscles was recorded using surface *** variables assessed were the EMG total intensity as a function of time and the cumulative EMG overall *** effects of the chronological testing round(independent variable)on the normalized EMG overall intensity(dependent variable)were examined using Friedman analysis of variates and post hoc pairwise Wilcoxon signed-rank tests(α=0.05).Results There was a systematic reduction in overall EMG intensity for all 6 muscles over the time course of the running protocol(p<0.001)until the fourth testing round when EMG intensities reached a steady *** one exception was the biceps femoris muscle,which showed a significant reduction of EMG intensity during the stance phase(p<0.001)but not the swing phase(p=0.16).Conclusion While running at a predetermined speed,the neuromuscular system undergoes an adaptation process characterized by a progressive reduction in the activity level of major leg *** process may represent an optimization strategy of the neuromuscular system towards a more energetically efficient running *** running protocols should include a familiarization period of at least 7 min or 600 strides of running at the predetermined speed.

关键词： Muscle co-contraction Running familiarization Running footwear Running shoes Surface electromyography

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Changes in ankle work,foot work,and tibialis anterior activation throughout a long run

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Journal of Sport and Health Science 2022年第3期11卷 330-338页

作者： Eric C.Honert Florian Ostermair vinzenzvon tscharner Benno M.Nigg Human Performance Laboratory Faculty of KinesiologyUniversity of CalgaryCalgaryAlberta T2N 1N4Canada Institute of Sports and Sports Science Karlsruhe Institute of TechnologyKarlsruhe 76131Germany Department of Sports Science and Sports Friedrich Alexander University Erlangen-NurembergErlangen 91058Germany

Background The ankle and foot together contribute to over half of the positive and negative work performed by the lower limbs during ***,little is known about how foot kinetics change throughout a *** amount of negative foot work may decrease as tibialis anterior(TA)electromyography(EMG)changes throughout longer-duration ***,we examined ankle and foot work as well as TA EMG changes throughout a changing-speed *** Fourteen heel-striking subjects ran on a treadmill for 58 *** collected ground reaction forces,motion capture,and *** ran at 110%,100%,and 90%of their 10-km running speed and 2.8 m/s multiple times throughout the *** work was evaluated using the distal rearfoot work,which provides a net estimate of all work contributors within the *** Positive foot work increased and positive ankle work decreased throughout the run at all *** the 110%10-km running speed,negative foot work decreased and TA EMG frequency shifted lower throughout the *** increase in positive foot work may be attributed to increased foot joint work performed by intrinsic foot *** in negative foot work and TA EMG frequency may indicate that the TA plays a role in negative foot work in the early stance of a *** This study is the first to examine how the kinetic contributions of the foot change throughout a *** studies should investigate how increases in foot work affect running performance.

关键词： Electromyography Footwear Running performance

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