Increase in the conductivity and work function of pyrosol indium tin oxide by infrared irradiation

ArticleTHIN SOLID FILMS. 484(1-2): 272-277 (2005)journal articl

テレメーター法による筋電図積分値および酸素負債量からみた短距離走の研究

The aim of this study is to observe the effect of running speed on stride frequency, stride length, oxygen debt and integrated EMG activity during sprint running. Eight male subjects performed 100m running at three different submaximal and maximal speeds. These results were summarized as follows : (1) Stride frequency increased curve linearly with an increase of running speed. Stride length increased until 80% of maximal running speed, however it decreased slightly above that speed. (2) It was observed the curve linear relatioship (r=0.906) between oxygen debt (% of the highest value) and running speed (% of maximal speed). The regression equation was Y=2.2・10^X^, where Y is oxygen debt and X is running speed. (3) The correlation coefficient between oxygen debt and maximal running speed was 0.913 (p<0.001), also a significant correlation (r=0.923, p<0.001) was found between oxygen debt and stride frequency. (4) The EMG activity and integrated EMG of four muscles were obtained from lower extremities by means of telemetering during running at various speeds. Each integrated EMG activity from four muscle groups increased with increase of running speed or stride frequency or both. (5) The curve linear relationship was found between integrated EMG activity and running speed for three muscles (m. rectus femoris, m. biceps femoris, m. tibialis anterior), however a significant linear relationship (r=0.965, p<0.001) was obtained from only m. gastrocnemius. (6) A higher significant correlation coefficient was found between integrated EMG and oxygen debt for m. rectus femoris (p<0.001), m. biceps femoris (p<0.05), and m. tibialis anterior (p<0.001). The increase of integrated EMG for m. gastrocnemius indicated a different pattern compared to other muscle

持久的作業能に及ぼす姿勢変化の影響

The purpose of this study is to observe the effect of body position on circulatory responses and muscular endurance work capacity. Thirty four subjects participated in the study. Body position used to this study were three kinds. Horizontal-supine position(S), Head-down position(D), Head-up position(U). Each subject performed hand grip exercise in three different body positions. Forearm and lower leg blood flow was measured by using mercury-in-rubber strain gauge method. Blood sample were obtained from cubital vein and brachial artery in selected ten subjects. The results were summarized as follows : 1) The significant difference of resting blood flow was observed among three body positions. 2) In work of one-third work load of maximal hand grip strength, significant difference of performance was not observed among three body positions, but in 1/6 max. work, significant difference was observed between Head-up position and other two body positions. 3) As to the peak blood flow, difference between Head-up position and other two body positions was statistically significant. 4) Blood lactate and arterial-venous oxygen difference of immediately after exercise showed highest value in Head-up position. 5) Circulatory responses with body position change (hydrostatic effect, nervous regulation, etc.) seem to have influence on endurance work capacity. The longer the work time become, the more remarkable the effect of body position seem to be remarkable

角度漸増法によるトレッドミル歩行中の呼吸循環機能の変化

Eight male subjects, aged 20.3-33.5, walked on the motor-driven treadmill at 100m/min. The grade of the treadmill was increased 5% every four minutes from 0%. All subjects performed on the treadmill till exhaustion. The results obtained were as follows : 1) Maximal oxygen uptake was obtained from treadmill walking test with increasing grade. Mean VO_2 max for eight subjects was 3.59 l/min (S. D. : 0.36 l/min). 2) A significant positive correlation (r=0.934, p<0.001) was found between oxygen uptake and heart rate. The regression equation of oxygen uptake on heart rate was Y=36.6X+67 1. 3) The linear correlation coefficient between work load and oxygen uptake was 0.979 (P<0.001). The regression relationship was given by Y=0.0018X+0.818. 4) The work load during treadmill walking at 0% was 326.7 kgm/min, calculated from the regression equation of work load on oxygen uptake. (Y=0.0018X±0.818)

最大及び最大下作業中の呼吸循環機能におよぼす自転車エルゴメーターとトレッドミル歩行の影響

Oxygen uptake and integrated EMG from 4 leg muscles were measured in 7 male subjects, age 22-33 years, during submaximal and maximal treadmill and bicycle exercise. Oxygen uptake were 0.42 l/min higher during maximal uphill treadmill walking than during maximal bicycle exercise. This difference was statistically significant (P<0.001). Maximal heart rate was 193 and 197 beats/min for the bicycle and treadmill, respectively. At a given submaximal oxygen uptake, heart rate was about the same for the two types of exercise. The increase of the integrated EMG on bicycle was semilinier, with a relatively grater increase at the heavier work load than treadmill walking