ORIGINAL ARTICLE
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abstractA
comparison of EMG fluctuation of deltoid and pectoralis major muscles
in bench press Iraj Sadri1, Morteza
Jourkesh1, Sergej M. Ostojic2,
Julio Calleja Gonzalez3, Ali Ojagi1,
Abolfazl Neshati3 1Department
of Physical Education and Sports Science, Islamic Azad University,
Shabestar Branch, Iran 2Faculty
of Sport and Tourism, PA University of Novi Sad, Serbia 3Faculty
of Physical Education and Sports Science, University of Pais Vasco,
Spain 4Department of Physical Education
and Sports Science, Islamic Azad University, Marand Branch, Iran
Abstract
The
purpose
of this study was to compare the EMG fluctuation of pectoralis
major-clavicular portion (PMC) and deltoid-anterior portion (DA)
muscles executions of bench press with barbell and dumbbell. Fifteen
male healthy employees (mean ± SD; age 30.13 ±
5.33
years; height 175.33 ± 6.07 cm; weight 69.80 ±
12.14 kg)
without previous injuries of elbow and shoulder joints, DA and PMC
muscles, volunteered to participate in the study. Surface
electromyography data (AEMG and MPF) were recorded and calculated for
PMC and DA muscles of dominant hand, during execution of bench press
with both barbell and dumbbell exercise. Subjects performed 10 trials
of bench press within 20 seconds. Results showed no significant
difference between two execution of bench press with barbell and
dumbbell over EMG fluctuation of PMC and DA muscles (P ≤ 0.05).
However when EMG fluctuation of PMC and DA muscles were compared with
each other, a significant difference was found (P≤0.05), but in
both
exercise executions the EMG activity of DA was higher than PMC. The
results of this study indicated that two execution of bench press with
barbell and dumbbell are equally efficient in strengthening the PMC and
DA muscles because the posture adapted for elevation with hand
dumbbells is essentially the same one observed for elevation with
barbell. Otherwise the EMG activity of DA was higher than PMC, because
PMC showed abrupt activity to surpass the limb inertia and weight
against the gravity action at the initial position but it was found
similar behavior for DA in all phase of movement.
Key
words:surface
electromyography, deltoid, pectoralis major, bench press
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