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- W2972228328 abstract "This study examined the effect of drop height on neuromechanical control of the plantarflexors in drop jumps (DJs) before and during ground contact (GC). The effect of anticipation on muscle mechanical configurations was investigated in 22 subjects in three conditions (20, 30, and 40 cm): (i) known, (ii) unknown, or (iii) cheat falling heights (announced 40 cm, but actual drop height was 20 cm). Electromyographic (EMG) activity of the m. gastrocnemius medialis (GM) and other shank muscles was recorded and analyzed before GC and during GC separately for the short‐, medium‐, and long‐latency responses (SLR, MLR, and LLR). Changes in GM fascicle length ( L M ) were determined via B‐mode ultrasound, and muscle‐tendon unit length ( L MTU ) was estimated. Peak force ( P < .001), rate of force development (RFD) ( P = .001) and GM EMG activity prior to ( P = .003) and during GC ( P = .007) was reduced in the unknown compared with the known conditions ( P < .05). The amount of shortening in L MTU during GC in unknown and cheat was less compared with the known conditions ( P = .005; P = .049). Changes in L MTU lengthening negatively correlated with changes in GM activity around SLR and MLR ( P = .006; P = .02) in known and unknown conditions. Taken together, it seems that the central nervous system applies a protective strategy in the unknown condition by reducing muscle activity to result in a lower muscular stiffness and increased tendinous lengthening prior to and during GC. This might be a mechanism to absorb greater elastic energy in the tendon and reduce the magnitude and rate of muscle lengthening and subsequent stretch‐induced muscle damage." @default.
- W2972228328 created "2019-09-12" @default.
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- W2972228328 date "2019-10-01" @default.
- W2972228328 modified "2023-09-28" @default.
- W2972228328 title "Anticipation of drop height affects neuromuscular control and muscle‐tendon mechanics" @default.
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- W2972228328 doi "https://doi.org/10.1111/sms.13550" @default.
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