文献一覧: Yuki Kizawa (著者)

6 0 0 0 OA Effects of diet containing astaxanthin on visual function in healthy individuals: a randomized, double-blind, placebo-controlled, parallel study

著者: Takahiro Sekikawa Yuki Kizawa Yanmei Li Naoki Miura
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.72, no.1, pp.74-81, 2023 (Released:2023-01-01)
参考文献数: 40
被引用文献数: 3

Visual display terminal work has increased rapidly in recent years. Loss of visual acuity is an unfortunate associated effect. Here, we performed a randomized, placebo-controlled study in 60 healthy adults. Participants received a diet containing astaxanthin (9 mg/day) or placebo for 6 weeks. Visual acuity, functional visual acuity, and pupil constriction rate were measured before and after visual display terminal work. In participants aged ≥40 years, corrected visual acuity of the dominant eye after visual display terminal work at 6 weeks after intake demonstrated a higher protective effect of astaxanthin in the astaxanthin group vs the control group (p<0.05). In participants aged <40 years, no significant difference was seen between the astaxanthin and control groups. Moreover, no significant difference was found in functional visual acuity and pupil constriction rate between the astaxanthin and control groups. These results suggest astaxanthin reduces oxidative stress caused by visual display terminal work. Age-related reduction in ciliary muscle strength is likely the main detractor of visual acuity. Correspondingly, astaxanthin reduced visual display terminal work-induced visual stress in the middle-aged and elderly. This study was registered in the UMIN-CTR database (UMIN000043089).

2023-03-27 16:34:36
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3 0 0 0 OA Cognitive function improvement with astaxanthin and tocotrienol intake: a randomized, double-blind, placebo-controlled study

著者: Takahiro Sekikawa Yuki Kizawa Yanmei Li Tsuyoshi Takara
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.67, no.3, pp.307-316, 2020 (Released:2020-11-01)
参考文献数: 40
被引用文献数: 4 24

We examined the effects of the mixed ingestion of astaxanthin derived from Haematococcus pluvialis and tocotrienols on the cognitive function of healthy Japanese adults who feel a memory decline. Forty-four subjects were randomly but equally assigned to the astaxanthin-tocotrienols or placebo group. An astaxanthin-tocotrienols or placebo capsule was taken once daily before or after breakfast for a 12-week intervention period. The primary outcome was composite memory from the Cognitrax cognitive test, and the secondary outcomes were other cognitive functions and subjective symptoms for memory. Each group included 18 subjects in the efficacy analysis (astaxanthin-tocotrienols group, 55.4 ± 7.9 years; placebo group, 54.6 ± 6.9 years). The astaxanthin-tocotrienols group showed a significant improvement in composite memory and verbal memory in Cognitrax at Δ12 weeks compared with the placebo group. Additionally, the astaxanthin-tocotrienols group showed a significant improvement in the subjective symptom of ”During the last week, have you had trouble remembering people’s names or the names of things?” compared with the placebo group after 12 weeks. No adverse events were observed in this study. The results demonstrated that taking an astaxanthin-tocotrienols combination improves the composite memory and verbal memory of Japanese adults who feel a memory decline (UMIN 000031758).

2021-11-04 01:04:11
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2 0 0 0 OA Effects of anthocyanin, astaxanthin, and lutein on eye functions: a randomized, double-blind, placebo-controlled study

著者: Yuki Kizawa Takahiro Sekikawa Masakatsu Kageyama Haruna Tomobe Riyo Kobashi Takahiro Yamada
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: pp.20-149, (Released:2021-02-05)
参考文献数: 45
被引用文献数: 15

We examined the effects of a test food containing anthocyanin, astaxanthin, and lutein on the eye function in healthy Japanese adults with eye fatigue after operating visual display terminals. Forty-four subjects were randomly but equally assigned to the active or placebo group. Two active or placebo capsules were taken once daily for 6 weeks. Accommodative function, tear film break-up time, visual acuity, the value of Schirmer’s test, macular pigment optical density level, muscle hardness, and a questionnaire were evaluated before and after a 6-week intervention. Each group included 20 subjects in the efficacy analysis. The active group showed a significant improvement in the percentage of pupillary response of an average of both eyes and dominant eye pre- and post-visual display terminal operation at 6 weeks compared with the placebo group. Moreover, the active group showed a significant improvement in the scores of “A sensation of trouble in focusing the eyes” and “Difficulty in seeing objects in one’s hand and nearby, or fine print” compared with the placebo group between before and after ingestion. Therefore, 6-weeks consumption of the test food inhibited a decrease in the accommodative function caused by visual display terminal operation (UMIN000036989).

2021-07-31 06:25:41
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1 0 0 0 OA Effects of diet containing astaxanthin on visual function in healthy individuals: a randomized, double-blind, placebo-controlled, parallel study

著者: Takahiro Sekikawa Yuki Kizawa Yanmei Li Naoki Miura
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: pp.22-65, (Released:2022-10-18)
参考文献数: 40
被引用文献数: 3

2022-11-29 21:08:08
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