TY - JOUR
T1 - Comparison of the muscular electrical activity and hip–knee joint amplitude during bent-knee sit-up movement and abdominal exercises using a five-minute shaper device
T2 - a case study on an unconditioned subject
AU - Guerrero-Mendez, Cristian D.
AU - Moreno, Brayan S.
AU - Ramirez-Ruiz, Valery
AU - Duarte-Gonzalez, Mario E.
AU - Ruiz-Olaya, Andres F.
AU - Jaramillo-Isaza, Sebastian
N1 - Funding Information:
Using the EMG and kinematic data, it was possible to compare the physical conditioning when using the FMS device and the traditional exercise. The results show that the BKS exercise activates fewer muscles or in a lower intensity than the FMS. Consequently, the FMS device presented greater muscle activation and better biomechanical posture than the traditional BKS exercise. This fact suggests that this device's use could increase muscle strength in the abdominal and lower limb areas. Additionally, FMS presents a lower risk of suffering spine injuries in people who are not accustomed to regular exercise due to flexion-extension angles are not exceeded. Additionally, it was possible to observe how the electrical muscle activation changes throughout the movement cycle by comparing the flexion–extension of the knee and hip joints with the electrical activation of all muscles. In addition to the kinematic study, cyclograms are presented for each level of the device and for the traditional exercise, which allowed to determine that the knee and hip joints at the time of the exercise were in phase for the device, but were not in phase for the traditional exercise. Future studies should focus on increasing the population sample, analyzing muscle fatigue, study cardiac activation, and implement classification methods to improve motion characterization. Conflicts of interest - The authors declare no conflicts of interest in this work. Funding - This work was supported by Antonio Nariño University under the grant N.2019213
Publisher Copyright:
© JPES.
PY - 2021/12
Y1 - 2021/12
N2 - Problem statement: Different fitness devices that stimulate the abdominal muscles to improve sports performance or body image have been reported in the literature. Many of these devices are used by subjects without physical conditioning which, together with bad use of the devices, can generate serious musculoskeletal injuries. Purpose: This study compares the Five-minute Shaper (FMS) device and traditional bent-knee sit-up (BKS) exercise through hip–knee joint amplitudes and muscle electrical activity parameters. Materials and methods: A healthy volunteer participated in this study. This subject performed ten repetitions using the two exercise modalities. FMS is analyzed through three different levels (i.e., easy, medium, and extreme), and the traditional exercise is performed on a mat. We analyzed the knee and hip joint movement and performed surface electromyography (sEMG) of external abdominal oblique, internal abdominal oblique, upper rectus abdominis, erector spinae, rectus femoris, and biceps femoris muscles. The movements were performed in the sagittal plane in a 2D capture, and EMG was recorded using an eight-channel electrophysiographic measurement with bipolar surface electrodes. The joint amplitude was computed using Kinovea and processed by MATLAB. The muscle activation was processed by Root Mean Square (RMS) and normalized by Dynamic Peak Activity (PDA). Results: The obtained results show that the BKS exercise activates fewer muscles or at a lower intensity than FMS. Consequently, the FMS device presented greater muscle activation and better biomechanical posture than the traditional BKS exercise. The device has greater ergonomics than the traditional BKS exercise and is associated with a decrease in back injury. Nevertheless, there were significant differences (P < 0.05) in muscle activation for each level of FMS and traditional exercise. Conclusion: This study allows to conclude that the use of the FMS device may increase muscle strength in the abdominal and lower limb areas. Additionally, FMS presents a lower risk of suffering spine injuries in people who are not accustomed to regular exercise because flexion–extension angles are not exceeded.
AB - Problem statement: Different fitness devices that stimulate the abdominal muscles to improve sports performance or body image have been reported in the literature. Many of these devices are used by subjects without physical conditioning which, together with bad use of the devices, can generate serious musculoskeletal injuries. Purpose: This study compares the Five-minute Shaper (FMS) device and traditional bent-knee sit-up (BKS) exercise through hip–knee joint amplitudes and muscle electrical activity parameters. Materials and methods: A healthy volunteer participated in this study. This subject performed ten repetitions using the two exercise modalities. FMS is analyzed through three different levels (i.e., easy, medium, and extreme), and the traditional exercise is performed on a mat. We analyzed the knee and hip joint movement and performed surface electromyography (sEMG) of external abdominal oblique, internal abdominal oblique, upper rectus abdominis, erector spinae, rectus femoris, and biceps femoris muscles. The movements were performed in the sagittal plane in a 2D capture, and EMG was recorded using an eight-channel electrophysiographic measurement with bipolar surface electrodes. The joint amplitude was computed using Kinovea and processed by MATLAB. The muscle activation was processed by Root Mean Square (RMS) and normalized by Dynamic Peak Activity (PDA). Results: The obtained results show that the BKS exercise activates fewer muscles or at a lower intensity than FMS. Consequently, the FMS device presented greater muscle activation and better biomechanical posture than the traditional BKS exercise. The device has greater ergonomics than the traditional BKS exercise and is associated with a decrease in back injury. Nevertheless, there were significant differences (P < 0.05) in muscle activation for each level of FMS and traditional exercise. Conclusion: This study allows to conclude that the use of the FMS device may increase muscle strength in the abdominal and lower limb areas. Additionally, FMS presents a lower risk of suffering spine injuries in people who are not accustomed to regular exercise because flexion–extension angles are not exceeded.
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U2 - 10.7752/jpes.2021.06483
DO - 10.7752/jpes.2021.06483
M3 - Research Article
AN - SCOPUS:85123363661
SN - 2247-8051
VL - 21
SP - 3577
EP - 3585
JO - Journal of Physical Education and Sport
JF - Journal of Physical Education and Sport
IS - 6
M1 - 483
ER -