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Effects of soy isoflavone supplementation on cognitive function in Chinese postmenopausal women: a double-blind, randomized, controlled trial.

Abstract

OBJECTIVE

To investigate whether soy-derived isoflavone extract improves performance in cognitive function and quality of life in Chinese postmenopausal women.

DESIGN

The study was a 6-month double-blind, randomized, placebo-controlled, parallel group trial. Participants were community-dwelling women aged 55 to 76 years; 191 eligible women were randomly assigned to receive a daily oral intake of 80 mg soy-derived isoflavones or an identical-appearing placebo for 6 months. Standardized neuropsychological tests of memory, executive function, attention, motor control, language, and visual perception and a global cognitive function assessment were administered face-to-face individually at baseline and at 6-months posttreatment. The validated Chinese version of the Short Form-36 was used for quality of life measurements.

RESULTS

Of the participants, 88% (168 women: 80 among the supplementation group and 88 among the placebo group) completed the trial. Intention-to-treat analysis, conducted for 176 participants with 6-month assessment results, revealed no significant differences in outcome measures between treatment groups. Subgroup analysis among the good compliers only (consumed at least 80% of the supplements or placebo; n = 168) and among the age groups younger or older than 65 years also indicated no significant differences for any outcome measures. Types of complaints of adverse events were similar in both treatment groups and included mainly gastrointestinal and musculoskeletal problems.

CONCLUSIONS

This 6-month trial indicates that 80-mg soy-derived isoflavone supplementation did not improve performance on standard neuropsychological tests and overall quality of life in generally healthy Chinese postmenopausal women.

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  • Authors+Show Affiliations

    ,

    Department of Community and Family Medicine, School of Public Health, The Chinese University of Hong Kong, SAR. suzanneho@cuhk.edu.hk

    , , , , ,

    Source

    Menopause (New York, N.Y.) 14:3 Pt 1 pg 489-99

    MeSH

    Activities of Daily Living
    Adult
    Aged
    China
    Cognition
    Double-Blind Method
    Female
    Humans
    Isoflavones
    Middle Aged
    Osteoporosis, Postmenopausal
    Postmenopause
    Soybean Proteins
    Surveys and Questionnaires
    Treatment Outcome
    Women's Health

    Pub Type(s)

    Controlled Clinical Trial
    Journal Article
    Randomized Controlled Trial
    Research Support, Non-U.S. Gov't

    Language

    eng

    PubMed ID

    17308499

    Citation

    Ho, Suzanne C., et al. "Effects of Soy Isoflavone Supplementation On Cognitive Function in Chinese Postmenopausal Women: a Double-blind, Randomized, Controlled Trial." Menopause (New York, N.Y.), vol. 14, no. 3 Pt 1, 2007, pp. 489-99.
    Ho SC, Chan AS, Ho YP, et al. Effects of soy isoflavone supplementation on cognitive function in Chinese postmenopausal women: a double-blind, randomized, controlled trial. Menopause. 2007;14(3 Pt 1):489-99.
    Ho, S. C., Chan, A. S., Ho, Y. P., So, E. K., Sham, A., Zee, B., & Woo, J. L. (2007). Effects of soy isoflavone supplementation on cognitive function in Chinese postmenopausal women: a double-blind, randomized, controlled trial. Menopause (New York, N.Y.), 14(3 Pt 1), pp. 489-99.
    Ho SC, et al. Effects of Soy Isoflavone Supplementation On Cognitive Function in Chinese Postmenopausal Women: a Double-blind, Randomized, Controlled Trial. Menopause. 2007;14(3 Pt 1):489-99. PubMed PMID: 17308499.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - Effects of soy isoflavone supplementation on cognitive function in Chinese postmenopausal women: a double-blind, randomized, controlled trial. AU - Ho,Suzanne C, AU - Chan,Agnes S Y, AU - Ho,Yee Ping, AU - So,Edwin K F, AU - Sham,Aprille, AU - Zee,Benny, AU - Woo,Jean L F, PY - 2007/2/20/pubmed PY - 2007/7/13/medline PY - 2007/2/20/entrez SP - 489 EP - 99 JF - Menopause (New York, N.Y.) JO - Menopause VL - 14 IS - 3 Pt 1 N2 - OBJECTIVE: To investigate whether soy-derived isoflavone extract improves performance in cognitive function and quality of life in Chinese postmenopausal women. DESIGN: The study was a 6-month double-blind, randomized, placebo-controlled, parallel group trial. Participants were community-dwelling women aged 55 to 76 years; 191 eligible women were randomly assigned to receive a daily oral intake of 80 mg soy-derived isoflavones or an identical-appearing placebo for 6 months. Standardized neuropsychological tests of memory, executive function, attention, motor control, language, and visual perception and a global cognitive function assessment were administered face-to-face individually at baseline and at 6-months posttreatment. The validated Chinese version of the Short Form-36 was used for quality of life measurements. RESULTS: Of the participants, 88% (168 women: 80 among the supplementation group and 88 among the placebo group) completed the trial. Intention-to-treat analysis, conducted for 176 participants with 6-month assessment results, revealed no significant differences in outcome measures between treatment groups. Subgroup analysis among the good compliers only (consumed at least 80% of the supplements or placebo; n = 168) and among the age groups younger or older than 65 years also indicated no significant differences for any outcome measures. Types of complaints of adverse events were similar in both treatment groups and included mainly gastrointestinal and musculoskeletal problems. CONCLUSIONS: This 6-month trial indicates that 80-mg soy-derived isoflavone supplementation did not improve performance on standard neuropsychological tests and overall quality of life in generally healthy Chinese postmenopausal women. SN - 1072-3714 UR - https://www.unboundmedicine.com/medline/citation/17308499/Effects_of_soy_isoflavone_supplementation_on_cognitive_function_in_Chinese_postmenopausal_women:_a_double_blind_randomized_controlled_trial_ L2 - http://Insights.ovid.com/pubmed?pmid=17308499 DB - PRIME DP - Unbound Medicine ER -