![]() A break between the measurements was provided to prevent muscle weakness due to muscle relaxation. The measurement of muscle strength was performed in the order of the dorsiflexors and plantar flexors of the ankle, flexors and extensors of the hip joints, and flexors and extensors of the knee joint. Īll subjects were measured for muscle strength in 6 groups of the lower extremities (extensors and flexors of ankle, knee, and hip joint).Īs for the measurement postures, the dorsiflexors and plantar flexors of the ankle and flexors and extensors of the hip joints were measured in supine position, and flexors and extensors of the knee joint were measured in sitting position. Evaluation of muscle strength using the hand-held dynamometer is performed in the same manner as the manual muscle strength test, but it is more advantageous and more objective than the manual test in detecting a change in muscle strength because the specific numerical value of muscle strength is shown. ![]() ![]() All measurements were performed 3 times and the results are expressed as mean ± standard deviation.Ī hand-held dynamometer (Commander Muscle Tester, JTech, USA) was used to evaluate the lower-extremity strength of the subjects. After all the measurements were taken during the day, the subjects were scheduled for another day to make repeated measurements ( Figure 1). Patients were given sufficient rest between measurements to avoid fatigue, and ROM and muscle strength measurements were measured by 2 therapists. Muscle strength was measured by measuring the flexor and extensor of the 3 joints of the lower extremities (hip joint, knee joint, and ankle joint) and evaluating quantitative values using a muscle contraction dynamometer. This performance was measured with eyes closed and then with eyes open.Īnkle ROM was measured in dorsiflexion and plantar flexion, and both active and passive ROM were measured. Balance ability was measured by keeping the subject on the balance board and measuring the sway length and sway velocity for 1 min. After measuring the balance ability for the first time, ankle ROM was measured and leg strength was measured at the end. To prevent fatigue of lower-extremity muscles from affecting other measurement results, the measurement order was fixed. Therefore, the purpose of this study was to analyze the effect of ankle ROM and lower-extremity muscle strength on static balance control ability in young adults.īefore the experiments, all subjects were informed about the experimental methods and procedures, which were demonstrated by one of the researchers before the test. Therefore, we performed the present study to investigate the effect of ankle ROM and lower-extremity muscle strength, and to determine which factors have the greatest effect on static balance ability. However, there is little information on how these factors affect static balance ability and how these influences appear when these factors are combined. įactors affecting balance ability have been studied for many years. In addition, the proprioception that senses the position of the joints and the stiffness of the non-contractile structures around the joints, which are related to joint stability, can also affect static balance control ability. Īnkle joint ROM is also important, because balance is most frequently controlled in the ankle joint, and the movement of the joint is large. To maintain upright posture, a certain level of muscle strength is essential, and lower-extremity muscles near the ankle and knee joint must work properly to maintain posture stability and prevent falls. Previous studies on static balance control ability showed that leg strength, ROM, proprioception, and joint stability are related to static balance ability. īecause the human center of gravity (COG) is high, dynamic balance control ability and static balance control both require considerable energy consumption and high levels of motor control. Because these 2 balance control abilities are applied differently depending on the situation, the patterns and strategies of using the joints are also different. Dynamic balance control ability controls balance of the body during movement such as walking, and static balance control ability controls balance of the body while standing still. Balance control ability can be divided into dynamic balance control ability and static balance control ability according to the movement. Balance ability refers to the ability to maintain the center of gravity above the base of support and to keep stable body alignment and posture.
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