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Mean motor unit firing rates (MUFRs) of the biceps femoris (BF) and semimembranosus-semitendinosus (SS) at knee joint angles of 90° and 160°. Axes are reversed from Fig. 4 to be consistent with typical methods of plotting stimulated force-frequency curves (as seen in Fig. 2). The MUFRs progressively increased with contraction intensity in both muscle groups and both knee joint angles (P < 0.001); n = 10. Values are means, with error bars representing SDs. *P < 0.01, **P < 0.001.
