著者
Tomohiro Sugino Sayaka Aoyagi Tomoko Shirai Yoshitaka Kajimoto Osami Kajimoto
出版者
SOCIETY FOR FREE RADICAL RESEARCH JAPAN
雑誌
Journal of Clinical Biochemistry and Nutrition (ISSN:09120009)
巻号頁・発行日
vol.41, no.3, pp.224-230, 2007 (Released:2007-10-30)
参考文献数
21
被引用文献数
17 24

We examined the effects of citric acid and L-carnitine administration on physical fatigue. In a double-blind, placebo-controlled, 3-way crossover study, 18 healthy volunteers were randomized to oral citric acid (2,700 mg/day), L-carnitine (1,000 mg/day), or placebo for 8 days. The fatigue-inducing physical task consisted of workload trials on a cycle ergometer at fixed workloads for 2 h on 2 occasions. Before the physical load, salivary chromogranin A, measured as a physiological stress marker, was lower in the group given citric acid than in the group given placebo. Also, after the physical load, the subjective feeling of fatigue assessed with a visual analogue scale was lower in the citric acid group than in the placebo group. In contrast, L-carnitine had no effect on chromogranin A or subjective fatigue. These results suggest that citric acid reduces physiological stress and attenuates physical fatigue, whereas L-carnitine does not.
著者
Noriya Nakao Kazuaki Tobari Tomohiro Sugino Yoshiki Ito Mitsuhiro Mishima Daisuke Maeda
出版者
The Institute of Electrical Engineers of Japan
雑誌
IEEJ Journal of Industry Applications (ISSN:21871094)
巻号頁・発行日
vol.10, no.4, pp.497-505, 2021-07-01 (Released:2021-07-01)
参考文献数
9
被引用文献数
10

This paper presents a control scheme for smooth torque production in permanent-magnet synchronous motor drives. The proposed control scheme consists of two techniques: a feedforward compensation for torque ripple minimization and an online parameter estimation technique for harmonic fluxes. The feedforward compensation is constructed on a position-sensorless vector control system and generates voltage commands to suppress torque ripples. The command calculation process requires the parameters of the harmonic fluxes; therefore, the proposed control scheme includes their estimator and calculates them from detected current information. These techniques are simpler than existing ones and can be implemented on a computational device with a small amount of calculation load. The proposed control scheme is verified by performing simulations and experiments.