Objective: The purpose of this study was to investigate the maximum core muscle activation angle according to core-strengthening exercises. Method: Twenty-six young female football players (age: $17.84{\pm}0.80years$, height: $163.08{\pm}5.25cm$, weight: $54.96{\pm}7.41kg$...
Objective: The purpose of this study was to investigate the maximum core muscle activation angle according to core-strengthening exercises. Method: Twenty-six young female football players (age: $17.84{\pm}0.80years$, height: $163.08{\pm}5.25cm$, weight: $54.96{\pm}7.41kg$) registered in the Korea Football Association from D High School located in Seoul were the subjects of this research. An electromyogram (Noraxon, USA) was used for monitoring the maximum core muscle contraction activity. Results: The angle for the maximum core muscle strength per core exercise and muscle was the smallest for the upper rectus abdominis in the windshield wiper exercise. The angle of the vastus medialis was significantly the largest. The range of angles at which the maximum strength was observed for each core exercise were as follows: 1) abdominal flutter kicks ($11{\sim}40^{\circ}$), 2) leg raises ($21{\sim}34^{\circ}$), 3) scissors ($45{\sim}66^{\circ}$), 4) knee to elbow sit-ups ($42{\sim}64^{\circ}$), 5) reverse crunches ($9{\sim}40^{\circ}$), 6) butt-ups ($24{\sim}32^{\circ}$), 7) V sit-ups ($5{\sim}24^{\circ}$), 8) windshield wipers ($11{\sim}20^{\circ}$), 9) bird dog ($11{\sim}18^{\circ}$), and 10) raised leg plank ($38{\sim}50^{\circ}$). Conclusion: Four kinds of motion could be classified according to the range of angles at which the core muscles were maximally activated. The first group involves the range of motion that gives the maximum muscle strength when the lower extremity and ground angle was between $5^{\circ}$ and $24^{\circ}$, such as the V sit-ups, windshield wipers, and bird dog. The second group comprised the flutter kicks and reverse crunches at an angle between $9^{\circ}$ and $40^{\circ}$. The third group comprised the leg raise and butt-up exercises at an angle between $21^{\circ}$ and $34^{\circ}$. The fourth group included the scissors, knee to elbow sit-ups, and raised leg plank at an angle between $38^{\circ}$ and $66^{\circ}$. These results may be useful as basic data for core movement and core muscle training according to the purpose of exercise.
Objective: The purpose of this study was to investigate the maximum core muscle activation angle according to core-strengthening exercises. Method: Twenty-six young female football players (age: $17.84{\pm}0.80years$, height: $163.08{\pm}5.25cm$, weight: $54.96{\pm}7.41kg$) registered in the Korea Football Association from D High School located in Seoul were the subjects of this research. An electromyogram (Noraxon, USA) was used for monitoring the maximum core muscle contraction activity. Results: The angle for the maximum core muscle strength per core exercise and muscle was the smallest for the upper rectus abdominis in the windshield wiper exercise. The angle of the vastus medialis was significantly the largest. The range of angles at which the maximum strength was observed for each core exercise were as follows: 1) abdominal flutter kicks ($11{\sim}40^{\circ}$), 2) leg raises ($21{\sim}34^{\circ}$), 3) scissors ($45{\sim}66^{\circ}$), 4) knee to elbow sit-ups ($42{\sim}64^{\circ}$), 5) reverse crunches ($9{\sim}40^{\circ}$), 6) butt-ups ($24{\sim}32^{\circ}$), 7) V sit-ups ($5{\sim}24^{\circ}$), 8) windshield wipers ($11{\sim}20^{\circ}$), 9) bird dog ($11{\sim}18^{\circ}$), and 10) raised leg plank ($38{\sim}50^{\circ}$). Conclusion: Four kinds of motion could be classified according to the range of angles at which the core muscles were maximally activated. The first group involves the range of motion that gives the maximum muscle strength when the lower extremity and ground angle was between $5^{\circ}$ and $24^{\circ}$, such as the V sit-ups, windshield wipers, and bird dog. The second group comprised the flutter kicks and reverse crunches at an angle between $9^{\circ}$ and $40^{\circ}$. The third group comprised the leg raise and butt-up exercises at an angle between $21^{\circ}$ and $34^{\circ}$. The fourth group included the scissors, knee to elbow sit-ups, and raised leg plank at an angle between $38^{\circ}$ and $66^{\circ}$. These results may be useful as basic data for core movement and core muscle training according to the purpose of exercise.
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문제 정의
The purpose of this study was to investigate the angles at which the core muscles are effectively activated by analyzing the muscle activation of each core muscle for weight-bearing core training exercises. The results obtained from this study may be useful as basic data for efficient core muscle training.
제안 방법
0). One-way analysis of variance was used for the analysis of the lower extremity and ground angles at which each of the seven core muscles were maximally activated during the 10 core-strengthening exercises. A post-hoc least square difference test was used to identify differences among groups for each independent variable, and the significance level was set at α = .
The angle between the two lines, the horizontal line crossing the femoral head of the limb and the line connecting the femoral head of the limb to the medial or lateral malleolus, was defined as the lower extremity and ground angle. The captured images were used to measure the lower extremity and ground angles, and the measured values were used for the analysis (Table 1).
대상 데이터
A total of 26 young female football players (age: 17.84 ± 0.80 years, height: 163.08 ± 5.25 cm, weight: 54.96 ± 7.41 kg) registered in the Korea Football Association from D High School located in Seoul were the subjects of this research.
An eight-channel electromyogram (Myotrace 400, Noraxon, USA) was used to determine the angle at which each of the selected core muscle was maximally activated. SEED EMG single electrodes (SEEDTECH, Korea) were used. The upper rectus abdominis, lower rectus abdominis, external oblique, internal oblique, rectus femoris, vastus lateralis, and vastus medialis were selected for core muscle activation assessment.
이론/모형
Each exercise movement was held for 3 sec, and each movement was limited to 120 bpm of the metronom. In order to compare data between subjects, the surface EMG data were processed with a recursive digital filter (Matlab Elliptic filter; 80-Hz low pass, 250-Hz high pass) and rectified using a full-wave rectification method. The rectified signals were then converted to RMS values, normalized to MVIC, and expressed as a percentage (%MVIC).
성능/효과
In the present study, we selected 10 core-strengthening exercises that are often employed in core training, and measured the muscle activation of four upper body muscles and three lower body muscles for each core-strengthening exercise. The results of our study are significant in that we analyzed the muscle activation values and identified the optimal angular difference between the ground and lower extremity for each core-strengthening exercise.
후속연구
The purpose of this study was to investigate the angles at which the core muscles are effectively activated by analyzing the muscle activation of each core muscle for weight-bearing core training exercises. The results obtained from this study may be useful as basic data for efficient core muscle training.
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