F-1-05-06
The pattern of muscular contraction elicited by repititive magnetic stimulation
Takayo Chuma, Yukio Mario, Rie Nakane, Ichiro Watanabe, Osamu Shirado (Hokkaido University, Sapporo, Japan)
Abstract: The pattern of muscular contraction elicited by electrical stimulation was studied. Pattern of muscular contraction in proximal muscles of human have never been observed because of difficulty in method using electrical stimulation. Therefore, we tried to study the contraction patterns of human biceps muscle using repititive magnetic stimulation. We assessed 12 volunteers without neuromuscular disease. The forearm of the subjects was fixed on a plate with the strain gauge. The round coil was placed on biceps muscle and we recorded the contraction pattern with the strain gauge. We examined the single twitch and tetanic contraction by magnetic stimulation. We produced tetanic contraction by repititive magnetic stimulation 50Hz for 0.5 Sec. The result is that the twitch tension of single twitch got larger by increasing stimulation intensity. The twitch tension of single twitch after tram of 50Hz was larger than the twitch tension before the train. Repititive magnetic stimulation is a useful and simple method to analyze the pattern of muscular contraction of human proximal muscles.
F-1-05-07
ENDURANCE CAPACITY AND ELECTRICAL ACTIVITY OF THE STERNOCLEIDO IN PATIENTS WITH EMPHYSEMA DURING EXERCISE STRESS TESTS BEFORE AND AFTER VOLUME REDUCTION SURGERY
Klyoshl Mineo ( Fujieda Minami Clinic, Japan ), Hiroki Ebata ( Dept. of Rehab. Med., Shizuoka City Hospital, Japan), Kouji Chihara (Division of Thoracic Surgery, Shizuoka City Hospital, Japan ), Akio Kimura, Naoichi Chino ( Dept. of Rehab. Med., Keio University )
In order to evaluate the activity of respiratory muscles in chronic obstructive pulmonary disease (COPD) patients during exercise before and after volume reduction surgery (VRS), we performed an exercise stress test using a bicycle ergometer on four patients (62-72 yr, %FEV1=28%) before and after VRS and one healthy 59-year male. We measured surface EMGs for sternocleldomastold (SCM) and other respiratory muscles, dyspnea by modified Borg scale, SpO2, ECG, and blood pressure under the exercise stress test. We found: 1) electrical activity of the SCM in all patients increased gradually under lower loads (0-30 watts ) followed by greater increments under higher loads while no electrical activity of SCM was observed in the healthy control except at the higher load; 2) electrical activities of SCM and dyspnea decreased, and exercise endurance time improved in COPD patients after VRS.
