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. Author manuscript; available in PMC: 2009 Aug 1.
Published in final edited form as: J Electromyogr Kinesiol. 2007 Feb 21;18(4):662–671. doi: 10.1016/j.jelekin.2007.01.001

Fig. 7.

Fig. 7

Average peak forces generated in response to the last fatiguing train (left) and the post-fatigue 60 Hz testing train (right) during the frequency-modulation and the pulse-duration (PD)-modulation protocol. Both the last fatiguing train and the post-fatigue testing trains were 60 Hz trains with 600 μs PD and were separated by a 1 s rest time and a twitch. Note the larger increase in peak force from the last fatiguing train to the post-fatigue 60 Hz testing train during the PD-Modulation than the frequency-modulation protocol. *p ≤ 0.05.