UPSI Digital Repository (UDRep)
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Abstract : Universiti Pendidikan Sultan Idris |
The purpose of the study was to determine the effects of stance-width on muscle
activation and number of repetitions completed during narrow, shoulder-width and wide stance during
Romanian deadlift (RDL) exercise. Thirty recreationally active, resistance trained men, aged
19-23 years old were randomly recruited based on volunteerism as participants in this
study. The participants were assigned to perform the RDL with narrow, shoulder-width and
wide stances while carrying 80% of one repetition maximum loading. Muscle activation was measured
using electromyography (EMG) method at the vastus lateralis, biceps femoris, gluteus maximus and
multifidus muscles. The EMG data were reported in concentric and eccentric values. The participants
were given three trials, and the number of repetitions and EMG of most successful set were taken to
be analyzed. One way repeated measure Analysis of Variances (ANOVA) was conducted to determine and
compare the muscle activation and number of repetitions between the three stances. Analysis of
concentric phase showed significant main effects were found in the gluteus maximus, F(2, 58) =
338.97; p = 0.000, and erector spinae muscle, F(2, 58) = 302.19, p =
0.000. Similar to the concentric phase, analysis of eccentric phase showed significant
main effects were found in the gluteus maximus activation, F(2, 58) = 204.982; p =
0.000, and erector spinae muscle, F(2, 58) = 215.184, p = 0.000. Analysis of number of repetitions
that can be completed by the participants showed significant main effects, F(2, 28) = 37.152; p
= 0.000. In conclusion, different stance-width used did affect muscle activation and
performance during RDL exercise. As the implication of this study, as can be seen in the EMG and
number of repetitions data, performing wide and shoulder width stance are recommended as these
stances allowed participants to perform better, without
putting more stress on the lower back.
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