Effect Of Different Compression Degrees On Variation Characteristics Of SEMG On Lower Limb Muscles During Cycling Motion

Purposes: According to the analysis and research of index data from sEMG,reflected variation characteristics of sEMG on lower limb muscles under differentcompression degrees in different intensity load during cycling motion to fatigue, andthen further discussed the influence of tight oppression degrees on muscle activity, inorder to enrich and develop the functional evaluation content and monitoring method ofsports training, and to provide scientific and theoretical evidence for application ofcompression sportswear in fitness, sports training and competitions.Methods: Selected10young healthy male volunteers without cycling trainingexperience randomly as subjects to complete uniform cycling motion to fatigue inmoderate and high intensity load on bicycle ergometer with no compression, mediumcompression and high compression at lower limb respectively. Got synchronousacquisition and record of sEMG signal on Vastus Medialis, Vastus Lateralis, BicepsFemoris, Medial Gastrocnemius and Tibialis Anterior through the motion process whichwas divided into10segments. After standardized processing of the data from iEMG andMF, compared and analyzed the differences between each set of data by two-factorvariance analysis and Post Hoc Multiple Comparisons Test.Results:(1) Without tight compression on lower limb muscles during middle andlater stage of cycling motion in moderate or high intensity load, iEMG (%) generallyincreased by the time while MF (%) decreased, which became more obvious withincreasing intensity load.(2) Under medium tight compression, there was no anyobvious difference in both general increasing range of iEMG (%) and reducing range ofMF (%) on lower limb muscles as compared with that of no tight compression betweenadjacent time intervals in moderate-intensity load during this cycling movement.However, during the later stage of cycling motion in high-intensity load, both general increasing range of iEMG (%) and reducing range of MF (%) on all measured musclesdeclined except Medial Gastrocnemius as compared with that of no compression.(3)Under high tight compression, both general increasing range of iEMG (%) and reducingrange of MF (%) on all measured muscles declined except Medial Gastrocnemius ascompared with that of no compression during the later stage of cycling motion inmoderate-intensity load. However, during the later stage of cycling motion inhigh-intensity load, both general increasing range of iEMG (%) and reducing range ofMF (%) on all measured muscles increased except Medial Gastrocnemius as comparedwith that of no compression.Conclusions: During the later stage of cycling motion, plus medium tightcompression in high-intensity load and plus high tight compression in moderateintensity load showed similar effects on lower limb muscles to maintain the outputpower of muscle contraction and the transmission rate of action potential, which may behelpful to delay the muscle fatigue and improve the sport performance to some extent.On the contrary, plus high tight compression may accelerate muscle fatigue during thelater stage of cycling motion in high-intensity load.