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Voluntary peak (a) quadriceps and (b) hamstring muscle activity during the 6 strength training exercises. Scatterplot with means ±1·SE (standard error of the mean) bars. KEM = Knee extensions in machine; KEE = Knee extensions with elastic band; LEP = Leg press in machine; STS=Sit-to-stand; OSQUAT = One-legged squat; SLR = Straight leg raise
