- 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.