Seo, Jina
(Physical Therapy Clinic, Seoul Hospital)
,
Chung, Yijung
(Department of Physical Therapy, College of Health Science and Social Welfare, Sahmyook University)
Objective: This study aimed to identify the effects of performing shoulder and hip abduction during the V-sit exercise on abdominal muscle activity. Design: Cross-sectional study. Methods: Thirty healthy adults volunteered for this experiment. The participants randomly performed 6 types of V-sit exe...
Objective: This study aimed to identify the effects of performing shoulder and hip abduction during the V-sit exercise on abdominal muscle activity. Design: Cross-sectional study. Methods: Thirty healthy adults volunteered for this experiment. The participants randomly performed 6 types of V-sit exercises, including V-sit alone (hip 0°, shoulder 0°), V-sit with hip abduction 0° and shoulder abduction 15°, V-sit with hip abduction 0° and shoulder abduction 30°, V-sit with hip abduction 15° and shoulder abduction 0°, V-sit with shoulder and hip abduction 15°, and V-sit with shoulder abduction 30° and hip abduction 15°. EMG data were recorded from the rectus abdominis (RA), external oblique (EO), and internal oblique (IO) muscles of both sides. All abdominal EMG data during the six types of V-sit exercises were measured for 5 seconds, three times, and recorded for the middle 3 seconds excluding the 1 second at the start and end. Results: V-sit with shoulder abduction 30° resulted in significantly greater muscle activity of both RA, EO compared to shoulder abduction 0°, shoulder abduction 15° (p<0.05) and V-sit with shoulder abduction 15° showed significantly greater muscle activation of the RA compared with shoulder abduction 0° (p<0.05). The muscle activity of both EO and IO in the V-sit with hip abduction 15° was significantly greater than hip abduction 0° in all shoulder conditions (p<0.05). Conclusions: Greater angles of shoulder and hip abduction produced more abdominal muscle activity increases during the V-sit exercises. Shoulder abduction affected the RA, EO muscle activation and hip abduction affected the EO, IO muscle activation. This study showed that shoulder and hip abduction during V-sit exercises enabled effective activation of the trunk muscles.
Objective: This study aimed to identify the effects of performing shoulder and hip abduction during the V-sit exercise on abdominal muscle activity. Design: Cross-sectional study. Methods: Thirty healthy adults volunteered for this experiment. The participants randomly performed 6 types of V-sit exercises, including V-sit alone (hip 0°, shoulder 0°), V-sit with hip abduction 0° and shoulder abduction 15°, V-sit with hip abduction 0° and shoulder abduction 30°, V-sit with hip abduction 15° and shoulder abduction 0°, V-sit with shoulder and hip abduction 15°, and V-sit with shoulder abduction 30° and hip abduction 15°. EMG data were recorded from the rectus abdominis (RA), external oblique (EO), and internal oblique (IO) muscles of both sides. All abdominal EMG data during the six types of V-sit exercises were measured for 5 seconds, three times, and recorded for the middle 3 seconds excluding the 1 second at the start and end. Results: V-sit with shoulder abduction 30° resulted in significantly greater muscle activity of both RA, EO compared to shoulder abduction 0°, shoulder abduction 15° (p<0.05) and V-sit with shoulder abduction 15° showed significantly greater muscle activation of the RA compared with shoulder abduction 0° (p<0.05). The muscle activity of both EO and IO in the V-sit with hip abduction 15° was significantly greater than hip abduction 0° in all shoulder conditions (p<0.05). Conclusions: Greater angles of shoulder and hip abduction produced more abdominal muscle activity increases during the V-sit exercises. Shoulder abduction affected the RA, EO muscle activation and hip abduction affected the EO, IO muscle activation. This study showed that shoulder and hip abduction during V-sit exercises enabled effective activation of the trunk muscles.
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제안 방법
At the time of measurement, subjects were asked to lift their head, shoulders, trunk, and both lower limbs for 1 second with the bell sound of the experimenter, and after holding this for 3 seconds, they slowly lowered their upper and lower bodies within 1 second to return to the starting position. Shoulder and hip abduction movements were made by applying the guidelines that were prepared on four boards.
Abduction was performed to measure the muscle activity of the target muscles. Before the experiment, the V-sit posture and the upper and lower limb postures were sufficiently explained to the study subject, and the study was conducted after preliminary practice so that the study subject could fully understand the experimental movements.
In this study, 30 healthy adults who met the subject selection criteria were selected as the study participants and the investigation was conducted through a cross-sectional study design. Prior to the start of the experiment, the procedure was fully explained to the subjects, and after the subjects fully understood and signed the consent form, the experiment was conducted.
The limitation of this study is that the size of the sample group is small, and since the experiment was conducted on healthy adults, it is difficult to generalize to groups with specific characteristics such as low back pain and patients with stroke.
The selection criteria for subjects were those who could maintain a certain posture for more than 30 seconds after lifting the trunk or both lower limbs [17], and the exclusion criteria were those who had experienced low back pain in the last 6 months, had severe scoliosis or congenital spine. Those with deformities, those who were unable to perform exercise due to cancer or pregnancy, spinal disorders such as herniated discs [18], a history of neurological disorders and spinal surgery [19], pain in the lower back or abdomen, a wound or injury to the stomach due to surgery or trauma were excluded [8].
Therefore, this study attempted to present basic data for future exercise regimens by applying postural change to V-sit exercises in healthy subjects and examining the effect of postural change on abdominal muscle activity.
To assess the MVIC of each muscle, electrodes were attached to both internal, EO muscles and the rectus abdominal muscles, and the measurement posture of each muscle was performed based on the manual muscle test for each respective muscle. The rectus abdominal muscle was measured by flexing the knee to 90° in a supine position, fixing both feet, and applying resistance to the shoulder in the direction of trunk extension when the trunk was maximally flexed.
method In this study, in the V-sit position, bilateral hip joint 0° abduction, bilateral shoulder joint 0° abduction, 15° abduction, and 30° abduction were performed.
대상 데이터
This study included 30 subjects who had met the subject selection criteria among healthy adults. Before proceeding with the experiment, after explaining the experiment procedure and conditions to the study subjects, the study participants agreed to volunteer and signed the consent form.
데이터처리
To investigate the effect of V-sit posture on abdominal muscle activity, there were 3 upper extremity postural conditions of shoulder joint 0° abduction, 15° abduction, and 30° abduction, and the hip joint 0° abduction and 15° abduction. A two-way repeated measure ANOVA was performed for a total of six movements with the conditions applied. Post-hoc verification was performed using the least significant difference, and the statistical significance level (p) of all data was set to 0.
이론/모형
To measure muscle activity in each motion, the surface telemetry EMG system (TELEmyo 2400T G2; Noraxon, Scottsdale, AZ, USA, 2011) was used to measure the muscle activities of bilateral RA, EOs, and the IO muscles (inferior fibers of the IO), and the sampling rate of the EMG signal was set to 1,500 HZ, and the frequency bandwidth was set to 20-500 HZ. In this study, the measured muscle EMG signals were processed by full wave rectification using the MyoResearch XP Master edition software (Noraxon, 2011), and then root mean square 250 milliseconds was taken [25]. In the case of the IO muscle, the electrodes were attached in parallel with the muscle fiber in the lower part of the upper anterior iliac spine, and in the case of the EO muscles, the electrodes were attached parallel to the muscle fibers.
성능/효과
As a result of post-hoc analysis, the muscle activity of both EO muscles was significantly greater in the 15° hip abduction condition and the 30° shoulder abduction condition than in the shoulder joint 0° abduction (p<0.05), and in all hip abduction conditions, muscle activity was significantly greater in the shoulder 30° abduction condition than in the 15° abduction of the shoulder joint (p<0.05).
As a result of post-hoc analysis, the muscle activity of both IO muscles in all shoulder abduction conditions was significantly greater in the hip 15° abduction than in the 0° abduction (p<0.05; Table 1).
As a result of post-hoc analysis, the muscle activity of the bilateral RA was significantly greater in all hip abduction conditions in the shoulder 30° abduction condition, and it was significantly greater than in the shoulder joint 0° and 15° abduction conditions (p<0.05).
In this study, according to the changes in lower limb posture in the V-sit posture, there was a significant difference in muscle activity between the external and IO muscles, but not in the case of bilateral RA. At this time, both external and IO muscles showed significantly greater muscle activity in the 15° hip abduction condition than the 0° hip abduction (p<0.
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