Effect of past and present lifestyle habits and nutrition on calcaneal quantitative osteo-sono index in pre- and post-menopausal females

金沢大学人間社会研究域人間科学系This study is examined the effect of past and present lifestyle habits and nutrition on the osteosono assessment index (OSI) in pre- and post-menopausal females. The subjects were 200 premenopausal females (38.8±10.3years) and 156 postmenopausal females (59.2±5.9 years). BMD (Body mineral density) was estimated by right-calcaneal OSI using an ultrasonic transmission method with an AOS-100 device (ALOKA). The number of postmenopausal females in the close examination and guidance required groups (80 cases: 51.3%) (OSI < 2.428) was significantly higher than that of premenopausal females (44 cases: 22.0%) (X2=33.105: P<0.000). In premenopausal females, the proportion of subjects that had not taken vitamin D in the past (in junior high school and high school) was significantly higher in the close examination-guidance required group (OSI < 2.428) than in the normal group (OSI ≥ 2.428). However, in postmenopausal females, there was no significant difference in past and present lifestyle habits and nutrition between the close examination-guidance required group and the normal group. In premenopausal females, it was determined that the intake of vitamin D during puberty increased the absorption of calcium significantly. © 2010 SciRes

最大反復把握作業を用いた筋持久力評価変数の検討 : 筋力発揮値と筋酸素動態との関係から

取得学位：博士(学術)，学位授与番号：博甲第684号，学位授与年月日：平成16年9月30日,学位授与年：200

Force-time parameters during explosive isometric grip correlate with muscle power

金沢大学人間社会研究域人間科学系福井大学医学部Although explosive isometric contraction provides little work toward the outside, force-time parameters of the rising phase of the force-time curve may be able to predict muscle power. The purpose of this study was to examine the relationship between muscle power with work (power grip) and force-time parameters during the rising phase in explosive isometric grip. Fifteen healthy young adult males participated in this study. Power grip was measured using loads of 20%-50% of maximal voluntary contraction (MVC) (peak isometric force). Subjects pulled explosively on a grip bar held with the second digital joints without the thumb. Peak power was calculated from peak velocity and load. Explosive isometric grip was measured using a hand dynamometer. Time-series data of both tests were sampled by an analog-to-digital interface. Both tests were performed with the subjects seated with a sagittal and horizontal position of the arm supported by an armrest. Peak power in the power grip test tended to be larger with an increase of the load, but there was no significant difference between 40% and 50% MVC. Only the peak power in 50% MVC significantly correlated with peak grip force (r=0.52, p <0.05). The force-time parameters related to the peak rate of the rising force phase in explosive isometric grip significantly correlated with the peak powers (30%-50% MVC, r= 0.58-0.78 ). Peak rate of the rising force phase in explosive isometric grip may be useful for predicting muscle power with loads between 30%-50% MVC. © Springer-Verlag Italia 2007

Relationships between force and muscle oxygenation kinetics during sustained static gripping using a progressive workload

金沢大学人間社会研究域人間科学系This study aimed to examine the relationships between force and subjective muscle-fatigue sensation (SMS), and muscle oxygenation kinetics during sustained static gripping using a progressive workload. Subjects consisted of 10 males (height 173.2±7.1 cm, body weight 70.3±15.1 kg, and age 21.1±1.5 years). They performed sustained static gripping with 7 gradually increasing relative demand values of 20% to 80% maximal voluntary contraction (MVC). The staging of the progressive workload was 10 s for 20% MVC, 20 s each for 30, 40, 50, 60, and 70% MVC, and 10 s for 80% MVC. Borg\u27s SMS was used to measure the fatigue sensation of the antebrachial region in a pre-test and every 10 s during the test. The time to reach minimum Oxy-Hb/Mb appeared at about 50 s (52.6±25.2 s) after the onset of sustained static gripping, and the time to reach maximum Deoxy-Hb/Mb occurred later at 90 s. Significant and high correlations (r±0.632-0.721) were found between the time to reach maximum Deoxy-Hb/Mb, and Peak Force Time and Average Force. Even though the demand values caused a workload increase and reached 50% MVC, the change of Total Hb/Mb and Oxy-Hb/Mb kinetics was relatively small. Therefore, the effect caused by an obstruction of blood volume may not occur during the progressive workload. It was determined that the contraction time after the peak of SMS is relatively short and an individual difference in force value expands in the phase where SMS reaches its peak