Table 2: Frequencies of self-reported sensations during the training sessions.
(a) The strongest intensity of discomforting sensations

Intensity levelDay 1Day 2Day 3Day 4
01234012340123401234

Sham1121014118121575145
Active21183221823121542331652

0: none; 1: mild; 2: moderate; 3: considerable; 4: strong.
(b) How much did the sensations affect performance?

Intensity levelDay 1Day 2Day 3Day 4
01234012340123401234

Sham1952042222121
Active18712061871206

0: not at all; 1: slightly; 2: considerably; 3: much; 4: very much.
(c) When did the discomfort stop?

Intensity levelDay 1Day 2Day 3Day 4
ns123ns123ns123ns123

Sham115444144221935181
Active26992117628793986

ns: no sensations; 1: quickly; 2: middle of the block; 3: end of the block.