Brandt Mikkel, Jakobsen Markus Due, Thorborg Kristian, Sundstrup Emil, Jay Kenneth, Andersen Lars L
National Research Centre for the Working Environment Copenhagen, Denmark.
Arthroscopic Centre Amager, Amager University Hospital, Copenhagen, Denmark.
Int J Sports Phys Ther. 2013 Dec;8(6):811-9.
Decreased hip muscle strength is frequently reported in patients with hip injury or pathology. Furthermore, soccer players suffering from groin injury show decreased strength of hip muscles. Estimating 10-repetition maximum can be time-consuming and difficult, thus, using the Borg category rating 10 scale (Borg CR10 scale) can be a useful tool for estimating the intensity of exercise. The aims of this study were 1) to investigate the feasibility of the use of the Borg CR10 scale for rating strength training intensity of the hip abductor and hip adductor muscles, and 2) to compare hip muscle activity during hip abduction and hip adduction exercises using elastic resistance and isotonic machines, using electromyography (EMG).
EMG activity was recorded from 11 muscles at the hip, thigh and trunk during hip adduction and hip abduction exercises in 16 untrained women, using elastic resistance and isotonic exercise machines. These recordings were normalized to maximal voluntary contraction (MVC) EMG (nEMG). The exercises were performed at four levels of perceived loading reported using the Borg CR10: light (Borg ≤2), moderate (Borg >2-<5), heavy (Borg ≥5-<7) and near maximum (Borg ≥7).
Moderate to strong associations were observed between perceived loading and nEMG obtained during the adduction exercise with elastic resistance (r=0.8±0.3) as well as in machine (r=0.69±0.55) and the abduction exercise with elastic resistance (r=0.66±0.29) as well as in machine (r =0.62±0.54). The abduction exercise performed with elastic resistance displayed significantly higher gluteus medius nEMG recruitment than the in machine exercise.
The results of this study show that the Borg CR10 scale can be a useful tool for estimating intensity levels during resistance training of the hip adductor and hip abductor muscles. Although elastic resistance and exercise machine seem equally effective for recruiting muscle activity of the hip adductors, the elastic resistance condition was able to demonstrate greater muscle recruitment than the exercise machine during hip abduction.
髋部损伤或病变患者常出现髋部肌肉力量下降。此外，患有腹股沟损伤的足球运动员也表现出髋部肌肉力量下降。估计10次重复最大值可能既耗时又困难，因此，使用博格10级分类量表（Borg CR10量表）可能是估计运动强度的有用工具。本研究的目的是：1）探讨使用Borg CR10量表对髋外展肌和髋内收肌力量训练强度进行评级的可行性；2）使用肌电图（EMG）比较在使用弹性阻力和等张器械进行髋外展和髋内收运动时的髋部肌肉活动。
在16名未经训练的女性使用弹性阻力和等张运动器械进行髋内收和髋外展运动时，记录髋部、大腿和躯干11块肌肉的EMG活动。这些记录被标准化为最大自主收缩（MVC）EMG（nEMG）。运动按照使用Borg CR10报告的四个感知负荷水平进行：轻（Borg≤2）、中（Borg>2-<5）、重（Borg≥5-<7）和接近最大（Borg≥7）。
在内收运动中，使用弹性阻力（r=0.8±0.3）以及使用器械（r=0.69±0.55）时，感知负荷与nEMG之间观察到中度至强的相关性；在髋外展运动中，使用弹性阻力（r=0.66±0.29）以及使用器械（r =0.62±0.54）时，感知负荷与nEMG之间也观察到中度至强的相关性。与使用器械的运动相比，使用弹性阻力进行的外展运动表现出显著更高的臀中肌nEMG募集。
本研究结果表明，Borg CR10量表可作为估计髋内收肌和髋外展肌阻力训练强度水平的有用工具。虽然弹性阻力和运动器械在募集髋内收肌的肌肉活动方面似乎同样有效，但在髋外展过程中，弹性阻力条件下能够比运动器械表现出更大的肌肉募集。
