Research Report Abstracts - Gesundheit

WPT2011, Research Report Abstracts eS815
Research Report Poster Display
Number: RR-PO-202-25-Tue Tuesday 21 June 13:00
RAI: Exhibit Halls 2&3
ELECTRICAL STIMULATION OF THE ABDOMEN
PRESERVES MOTOR-PERFORMANCE OF
INACTIVE ELDERLY: A RANDOMIZED
CONTROLLED TRIAL
Miura M. 1 , Seki K. 2 , Handa Y. 3
1Tohoku University Graduate School of Medicine, Department
of Internal Medicine and Rehabilitation, Sendai, Japan,
2Sendai school, Sendai, Japan, 3Tohoku University Graduate
School of Medicine, Department of Developmental Neuroscience,
Sendai, Japan
Purpose: we applied electrical stimulation (ES) to the
abdominal muscles of the inactive elderly and investigated
its local and general effects. We also intended to develop a
new methodology of care-prevention for the inactive elderly.
Relevance: Strength of the trunk muscles is a key of motor
control but it declines easily with the process of aging and/or
disuse.
Participants: Twenty elderly people (65–89 years) who were
admitted to a nursing home or a hospital for daily care due to
disuse participated in this study
Methods: Surface electrical stimulation (ES) to the abdomen
was applied to half of them. ES was performed twice a day
during 8W adding to the physical therapy. Es or non-ES were
decided with random order. Surface electrodes were put on
the area of the bilateral abdominal oblique muscles. Immediately
before and 8Wafter start of the study, we examined
abdominal fat and muscle composition by using computerized
tomography (CT) and electromyography activity of
the abdominal muscles. HDL-cholesterol, LDL-cholesterol,
neutral fat, fasting plasma glucose and some functional measurements
as below were also performed; grip strength,
maximum walking speed, time of getting up, number of times
of trunk flexion, flexibility of the trunk, time of standing up
and the score of Barthel Index (BI).
Analysis: Statistical analyses were performed using
Wilcoxon’s signed-rank test to compare within-group values
between before and after start of the study. Mann–Whitney U
test was used to compare unpaired data. Differences between
the two groups were tested by two-way ANOVA. Values of
p < 0.05 were considered to indicate statistical significance.
Results: In the subjects with ES, cross-sectional area of the
abdominal muscles, abdominal muscle activity and motor
performance like trunk flexion, walking and getting up speed
were significantly improved 2 months after ES. In the non-ES
group no significant improvement was observed.
Conclusions: ES to the abdominal area has a possibility to
improve motor function in the infirm elderly through reinforcement
of the abdominal muscles.
Implications: It may also suggest that abdominal ES is a new
method for preventive care.
Keywords: Electrical stimulation; Preventive care; Abdominal
muscles
Funding acknowledgements: None.
Ethics approval: The study protocol was approved by
the Institutional Review Board of the Tohoku University
Graduate School of Medicine.
Research Report Poster Display
Number: RR-PO-203-27-Tue Tuesday 21 June 13:00
RAI: Exhibit Halls2&3
CHANGES OF TEMPERATURE BETWEEN
ELECTRODES BY ELECTRIC STIMULATION
Miwa M. 1 , Takeuchi Y. 1 , Horimoto Y. 1 , Ihashi K. 2 ,
Akatsuka S. 2
1Chiba Prefectural University of Health Sciences, Physical
Therapy Program, Chiba, Japan, 2Yamagata Prefectural
University of Health Sciences, Department of Physical Therapy,
Yamagata, Japan
Purpose: The purpose of this study is to elucidate muscle
fatigue and relevance of the heat production from the pulse
width and the frequency that are an important factor related
to the electric stimulation.
Relevance: To coordinate the intensity to decrease muscle
fatigue by the electric stimulation makes the tension constantly.
Participants: Fifteen subjects (mean age: 24.6) which understood
the significance and the purpose of the study were
explained, and obtained the agreement.
Methods: The stimulation electrodes separated 15 cm were
affixed to Tibialis Anterior. The experiment assumed the
stimulation of one second and the rest of 15 seconds for
1 cycle did not occur of muscle fatigue. As for the ES,
the stimulation carried 120 times about 30 minutes out. The
stimulation intensity assumed 20% of the muscle voluntary
contraction and was constant. The study was performed on
day by day so that muscle fatigue did not last. The study
assumed 30 Hz, 40 Hz, 50 Hz, and moreover measured by
pulse width 0.5 milliseconds, 1 milliseconds, 5 milliseconds
at 30 Hz. The EMG signal was analyzed by root mean square,
central and mean power frequencies from a few muscle contraction
at every interval. The skin temperature was measured
until the experiment end every one minute. For one case of
0.5 milliseconds at 50 Hz, the internal temperature was measured,
and the thermography was used. Two control studies
performed for ES and for TA muscle contraction. The experiment
protocols made same procedure as the present study.
Analysis: The skin temperature was compared with before
ES by Paired-t value. The skin temperature related the frequency
and the pulse width were analyzed by ANOVA. The
significant level was less than 5%.
Results: The RMS is maintained with 100%, 98.3%, 97.3%,
98.2% at the start, 5 minutes later, 15 minutes later and the