• 한국운동역학회지
• /
• 제19권1호
• /
• pp.139-148
• /
• 2009

본 연구는 Thera-Band를 이용해 단축성 수축과 신장성 수축이 혼합된 저항운동을 실시하는 것이 단축성 수축 저항 운동만을 실시하는 것보다 근력증진에 더 효과적인지를 알아보고자 하는 논문이다. 연구대상자는 부산광역시 소재 S 대학교에 재학 중인 학생 30명 이었으며, 30명을 무작위로 단축성 수축과 신장성 수축 운동군, 단축성 수축 운동군, 무운동군으로 나누어 4주 동안 운동을 실시하였다. 근력 측정은 등속성 운동기기인 CON-TERX를 이용하였으며, 각속도는 $60^{\circ}$/sec, $120^{\circ}$/sec이었다. 4주 운동 후, 단축성 수축과 신장성 수축 운동군의 경우 각속도 $60^{\circ}$/sec에서 단축성과 신장성 최대 토크와 최대 파워, 각속도 $120^{\circ}$/sec에서 단축성 최대 파워가 통계적으로 유의하게 증가하였다. 반면 단축성 수축 운동군은 각속도는 $60^{\circ}$/sec와 $120^{\circ}$/sec의 최대 파워에서만 유의한 증가가 있었다. 반면 무운동군은 변화가 없었다. 따라서 Thera-Band를 이용해 단축성 수축과 신장성 수축이 혼합된 운동을 실시하는 것이 단축성 수축 운동만을 실시하는 것보다 근력증진에 더 효과적임을 알 수 있었다.

• 한국운동역학회지
• /
• 제16권1호
• /
• pp.31-41
• /
• 2006

The primary purpose of a TKA is to restore normal knee function Therefore, ideally, a TKA should: (a) maintain the natural leverage of the knee joint muscles to ensure generating adequate knee muscle moments to accomplish daily tasks such as rising from climbing stairs; (b) provide adequate knee joint stability. A 16-channel MyoResearch XP EMG system was used to collect the differential input surface electromyography signals VM, VL, RF, BF, ST during climbing/descending stair tests. A Peak Motion Measurement System was used to collect the kinematic and kinetic data. AKIN-COM Ill isokinetic dynamometer was used for EMG of VM, VL, RF, BF and ST during maximal voluntary contraction. I Quadriceps EMG results for the VM of the passed 1year group limb demonstrated significant less RMS EMG than that of the passed 3year group limb $60^{\circ}-15^{\circ}$ of knee flexion(p<0.05). The VL of the passed 1year group limb also demonstrated significants less RMS EMG than that of the passed 3year group limb from $60^{\circ}-45^{\circ}$ of knee flexion(p<0.05). Similar to the VM and VL, the RF of the passed 1year group limb showed less RMS EMG than that of the passed 3year group limb from $60^{\circ}-30^{\circ}$ do knee flexion(p<0.05). Hamstring EMG results for the BF of the passed 1year group limb demonstrated less RMS EMG than that of the passed 3year group limb from $75^{\circ}-15^{\circ}$ of knee flexion(p<0.05). The passed 1year group limb tended to have less ADD displacement(p<0.071) than that of the passed 3year group limb. There was no significant difference of the ABD displacement between the passed 1year group and the passed 3year group limbs(p<0.73). The passed 3year group used compensatory adaptation movement strategies to compensate for the strength deficit of passed 3year group limbs. The passed 3year group limb also increased the quadriceps muscle activation level to produce more knee extension moment to compensate for the short quadriceps moment arm. The passe 3year group limb might have an unstable knee joint in the medio-Iateral direction during the climbing/descending by showing a tendency of more ADD displacement and greater hamming co-activation EMG than the passed 1year group limbs. The TKA design was not able to help the knee joint to produce adequate knee extension moment with less quadriceps muscle effort. I think that old man needs continuous exercise for muscle strength.

• Korean Journal of Acupuncture
• /
• 제29권1호
• /
• pp.83-92
• /
• 2012

Objectives : The purpose of this research was to develop the magnetic acupuncture system which used solenoid coil for magnetizing acupuncture needle. The system could generate the meridian electric potential (MEP) similar to the potential by manual acupuncture. Thus, we tried to confirm the therapeutic effect that is caused by the MEP generation. Methods : To confirm the MEP, we stimulated the magnetic acupuncture with at 2Hz, $92.7{\pm}2mT$, PEMFs (Pulsed Electro-Magnetic Fields) at ST37 and measured the evoked potential between ST36 and ST41. Also, we conducted a fatigue recovery test using isokinetic exercise in order to identify the therapeutic effect on musculoskeletal disorders. We chose LR9 as a stimulation point. To observe the state of fatigue, we measured the EMG and analyzed median frequency and peak torque for 20minutes. Results : We observed that MEP which incurred from magnetic acupuncture was higher than he reported MEP induced by manual acupuncture. Moreover, its modes were divided into two types by the direction of magnetic flux. When generating magnetic flux in the direction of acupoint, the positive peak voltage of the MEP was generated. In contrast, negative peak voltage of the MEP was generated whenever meganetic flux generated in the outward direction. As a result of fatigue recovery, the median frequency (MF) of the magnetic acupuncture group were recovered faster than that of the non-stimulation group. However, the peak torques of both groups were not restored until after 20 minutes. Conclusions : We confirmed that the magnetic acupuncture system can lead to the MEP similar to manual acupuncture. Moreover, the MEP had a therapeutic effect on the musculoskeletal disorders.