Effect of dried-bonito broth on mental fatigue and mental task performance in subjects with a high fatigue score.

Full Abstract

Dried-bonito broth is commonly employed as a soup and sauce base in Japanese cuisine and is considered to be a nutritional supplement that promotes recovery from fatigue. Previous human trials suggest that the ingestion of dried-bonito broth improves several mood states; however, its effect on fatigue has not yet been clarified. The aim of this study was to clarify the effects of daily ingestion of dried-bonito broth on fatigue and cognitive parameters by a placebo-controlled double blind crossover trial. Forty-eight subjects with fatigue symptoms ingested the dried-bonito broth or a placebo solution every day for 4 weeks. Mood states were evaluated by the Profile of Mood States (POMS), and mental task performance was evaluated by the Uchida-Kraepelin psychodiagnostic (UKP) test. Fatigue and total mood disturbance (TMD) scores on the POMS test decreased significantly during the dried-bonito broth ingestion (p<0.05), but did not change significantly during placebo ingestion. The change in vigor score during dried-bonito broth ingestion was significantly higher than that during placebo ingestion at 2 weeks (p<0.05). The results of the UKP test indicate that the numbers of both total answers and correct answers significantly increased during dried-bonito broth ingestion (p<0.05), while no significant changes were observed in the placebo ingestion. These results suggest that the daily ingestion of dried-bonito broth may improve the mood states, may reduce mental fatigue and may increase performance on a simple calculation task.

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Author information

Author/s: Kuroda, Motonaka (M); Ishizaki, Taichi (T); Maruyama, Tomoaki (T); Takatsuka, Yoji (Y); Kuboki, Tomifusa (T);

Affiliation: Processed Food Development & Technology Center, Ajinomoto Co., Inc., Kawasaki, Kanagawa, 210-8681, Japan. motonaka_kuroda(-atsign-)ajinomoto.com

Journal and publication information

Publication Type: Clinical Trial; Journal Article; Randomized Controlled Trial

Journal: Physiology & behavior (Physiol Behav), published in United States. (Language: eng)

Reference: 2007-Dec; vol 92 (issue 5) : pp 957-62

Dates: Created 2007/11/20; Completed 2008/02/29;

PMID: 17655888, status: MEDLINE (last retrieval date: 11/6/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adult
Affect - physiology
Analysis of Variance
Cross-Over Studies
Double-Blind Method
Fatigue - complications; diet therapy; psychology
Female
Fish Products

Follow-Up Studies
Humans
Male
Mental Fatigue - diet therapy; etiology
Middle Aged
Neuropsychological Tests
Psychiatric Status Rating Scales
Psychometrics

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