Whereas explosive ( rising phase ) force production during the first 50 ms of evoked maximal twitch and octet contractions ( eight electrical impulses at 300 Hz ) was also 3 % -15 % greater after NIT compared with that after PLA ( P = 0.023-0 .048 , ES = 0.52-0 .59 ) , explosive voluntary force remained similar ( P = 0.510 , ES = 0.16 ) .