Table 1 Electromyographic activity of the right and left suprahyoid muscles, expressed as root mean square of the amplitude (microvolts) in subjects with Chagas’ disease and control group.

From: Suprahyoid Muscle Activity in Patients with Chagasic Megaesophagus

Variables of EMG

Control

Chagas’ disease

p-value*

MVIC – RSH

56.8 (19.7)

33.3 (23.4)

0.002

MVIC – LSH

57.6 (21.1)

34.9 (23.6)

0.003

SL – RSH

48.9 (12.4)

29.7 (13.9)

<0.001

SL – LSH

49.4 (13.5)

32.0 (15.1)

0.000

SP – RSH

53.1 (19.4)

31.1 (11.4)

<0.001

SP – LSH

54.2 (22.2)

33.5 (13.4)

0.000

  1. MVIC: maximum voluntary isometric contraction; SL: swallowing liquid; SP: swallowing paste; RSH: right suprahyoid muscle; LSH: left suprahyoid muscle; *p values < 0.005. Data presented as mean (standard deviation).
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