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Fig. 7. (A) Normalized maximum magnitudes of gluteus maximus during control (closed
symbols) and `Groucho' (open symbols) walking (circles) and running (squares)
trials. (B) Maximum trunk pitch velocity during control (closed symbols) and
`Groucho' (open symbols) walking (circles) and running (squares) trials. (C)
Maximum trunk pitch velocity versus normalized EMG magnitude during
control (closed symbols) and `Groucho' (open symbols) walking (circles) and
running (squares) trials. Values are means ± 1 s.e.m.