Table 3

EMG findings and amplitude changes on a short exercise test and cold immersion tests

EMGShort exercise test (SET)Cold immersion test
Myotonic dischargeSpontaneous activityDuring SETLowest amplitudeTime to lowest amplitude (min)Rewarming to 25°CDuring SETLowest amplitudeTime to lowest amplitude (min)
I-1++16.4%↑ 7.3%↓4572.4%↓39.1%↑21.7%↓25
II-1++24.3%↑24.3%↓3047.4%↓28.3%↑37.0%↓15
II-3++21.9%↑28.6%↓2070.1%↓43.5%↑56.5%↓13
III-1+− 4.0%↑23.8%↓2512.6%↓ 6.3%↑42.7%↓15

  • During SET=CMAP amplitude changes compared with basal level during SET; Lowest amplitude=CMAP amplitude changes at the lowest amplitude compared with basal level; Rewarming to 25°C=CMAP amplitude changes at rewarming to 25°C after cold immersion compared with basal level; ↑=increase of amplitude change; ↓=decrease of amplitude change; −=absence of spontaneous activity.