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平成31年度 修士論文 抄録

There have benn many studies on pulmonary oxygen uptake(VO2) kinetics during a coustant-load exercise below and above lactate threshold (LT). Accorbing to previous exponential model (phase 1,2 and 3). In particular, much attention have been paied to the present, the controlling factors for phase2 component of VO2 kinetic seem to reside in an inertia of oxidative metabolism during moderate to heavy intensity exercise, while during severe intensity exercise, O2 delivery to exerising muscle seems to play a relative minor but significant role. There is another attractive phenomenon related to phase 3 of VO2 kinetics, so-called VO2 slow -component. The various mechanisms responsible for the VO2 slow-component have been propsed, including hyperventilation, lactic acidosis, secretion of catecholamine, elevated body temperature and recrutiment of low-efficiency type Ⅱ muscle fibers. The primary origin of the VO2 slow-component has been indicated to be within working limbs (～86%,Poole et. al. 1991). Although there have no direct evidence from previous studies that increased type Ⅱ fiber recruiment resulted in the VO2 slow- component, it could be a strong candidate for the VO2 slow-component. Consequently, further studies should be carried out to clarify as to which mechanism countributes directly to VO2 slow-component during heavy exercise.

Classical methods for the regulation of exercise intensity, based on objective physiological indices, e.g.heart rate oxygen uptake, have been indicated to be inadequate for maintaining subjective motivation contributing to exercise adherence. Rating of perceived exertion (RPE) developed by Borg has also been utilized in the setting of exercise prescription. However, a number of problems with this approach have been pointed out by some investigators. Therefore, we have proposed another method for self-prescription of exercise intensity through evaluation of psychological and physiological validity. The purpose of this study was to compare cardiorespiratory and psychological responses at self-prescribed power outputs 20-min cycling before (Pre) and after (Post) a 3-month supervised aerobic exercise program. Fourteen healthy middle-aged women (mean age 46±5 years) who had not taken regular exercise during the previous 5 years volunteered to participate in the study. Although the percentage lactate threshold (%VO_2LT) during the 20 min of cycling at Pre (108%VO_2LT) was significantly higher than that at Post (98%VO_2LT), the intensities selected by the subjects at Pre were also considered safe and effective. Furthermore, the subjects reported comfortable experiences and improvement of mood, which were recognized to have positive effects on exercise adherence, after 20-min cycling under both conditions. Thus, it is suggested that use of self-prescribed intensity for exercise prescription can be one of the ways of solving problems related to execise adherence.

application/pdf, We tested the device "LACTATE PRO" for rapid estimation of the lactate threshold in blood. Blood samples were obtained from eight healthy volunteers at various times during and after a treadmill exercise. Applying these samples to the LACTATE PRO measurement immediately after blood collection, each lactate level in the blood at the time of blood collection could be known just I min after the blood collection. Lactate levels measured with LACTATE PRO were reproducible. A good correlation was found between the lactate levels obtained by the LACTATE PRO method and those obtained by the standard enzymatic method. Assay for lactate in various samples with LACTATE PRO revealed that there was not a significant correlation between the lactate levels in venous blood and those in capillary blood., 大阪府立看護大学医療技術短期大学部紀要. 1997, 3, p.51-56