masterThesis
Normalização de eletromiografia de superfície dos músculos respiratórios em sujeitos saudáveis: contração voluntária máxima máxima isométrica versus pressões respiratórias máximas
Fecha
2014-10-21Registro en:
AZEVEDO, Ingrid Guerra. Normalização de eletromiografia de superfície dos músculos respiratórios em sujeitos saudáveis: contração voluntária máxima máxima isométrica versus pressões respiratórias máximas. 2014. 80f. Dissertação (Mestrado em Fisioterapia) - Centro de Ciências da Saúde, Universidade Federal do Rio Grande do Norte, Natal, 2014.
Autor
Azevedo, Ingrid Guerra
Resumen
Aim
: To evaluate and to standardize surface
electromyography (sEMG) normalization
procedures for respiratory muscles by comparing muscle activation during
Maximal
Voluntary Isometric Contraction (MVIC) and Maximal Respiratory Pressures (MIP, MEP
and sniff test).
Methods:
Healthy subjects were evalua
ted regarding demographics,
spirometry and sEMG during the five maneuvers: sniff test,
MIP
,
MEP and Maximal
Voluntary Isometric C
ontraction (MVIC) of RA,
SCM
and SC
A
. For electrode placement,
skin was prepared with abrasion, followed by shaving in the foll
owing regions for
acquisition of el
ectromyographic signals: (1) SC
M: lower third of the distance between the
mastoid process and t
he sternoclavicular joint; (2)
SC
A
: 5 cm to the right from the
sternoclavicular joint and
at this point, up to 2 cm; and (3
)
RA: the level of umbilicus, 4 cm
to the right. In electromyographic variables
analysis
, the
data normality
was assessed
by
Shapiro
-
Wilk test.
Comparisons among studied maneuvers were performed by Friedman
Test and Dunn’s post
-
hoc for multiple comparisons a
mong inspiratory maneuvers, and
Mann Whitney test for expiratory maneuvers. Subgroups differences between genders
were performed by Student's t test or Mann
-
Whitney test according to data normality.
Results:
35
subjects participated in the study, b
ut 5 we
re excluded (BMI> 25 kg/
m²).
Sample consisted of
30
subjects (1
5
women),
mean age 27.3±7.43 years, BMI 22.2
±
1.69
kg/m² and spirometric indices within normal limits.
Specific MVIC for SCM, SCA and RA
showed the highest RMS. When we grouped sample into
gender we found no difference
among RMS values for the studied SCM maneuvers, while for SCA, MVIC
SCM
/
SCA
was the
one with the highest RMS and for RA, MVIC
RA
in men. Once considering women,
MVIC
SCM/SCA
showed the highest RMS for SCM, SCA and MVIC
RA
showed t
he highest
value for RA.
Conclusion:
MVIC for SCM, SCA and RA muscles showed the highest RMS
values. When comparing RMS between the studied groups, there was no significant
difference between men and women.