Table 2 Subjective sleep quality, mental health, and mood state before and during the ingestion period.

From: Effects of Lactococcus lactis subsp. cremoris YRC3780 daily intake on the HPA axis response to acute psychological stress in healthy Japanese men

  

Ingestion period (weeks)

Baseline

2

4

6

8

PSQI

Placebo

4.0 ± 1.8

4.0 ± 2.1

4.3 ± 2.0

3.8 ± 2.2

3.8 ± 2.0

YRC3780

4.4 ± 1.6

4.0 ± 1.8

4.2 ± 1.5

3.3 ± 1.6

3.5 ± 1.2

P value

0.613

0.953

0.917

0.815

0.881

AIS

Placebo

4.3 ± 2.4

4.4 ± 2.5

4.2 ± 2.8

3.8 ± 2.0

4.1 ± 2.6

YRC3780

3.8 ± 2.4

3.6 ± 1.5

3.8 ± 2.6

2.1 ± 1.1a

2.6 ± 1.5

P value

0.604

0.759

0.771

0.031

0.134

GHQ-28

Placebo

4.3 ± 3.2

3.1 ± 2.6

3.7 ± 3.5

3.1 ± 4.2

3.5 ± 4.0

YRC3780

3.7 ± 3.2

2.7 ± 2.6

3.2 ± 3.6

2.5 ± 1.7

1.4 ± 1.4a

P value

0.460

0.617

0.503

0.538

0.038

POMS 2 TMD

Placebo

46.3 ± 5.1

46.3 ± 9.4

43.2 ± 7.7

44.4 ± 10.3

43.1 ± 6.5

YRC3780

48.3 ± 7.8

45.4 ± 3.6

44.5 ± 5.9

43.0 ± 6.1

42.6 ± 4.2

P value

0.573

0.622

0.330

0.952

0.972

  1. Values are means ± SD (n = 12–14). The p values in columns represent comparisons between YRC3780 and placebo by the Mann–Whitney U test.
  2. PSQI Pittsburgh Sleep Quality Index, AIS Athens Insomnia Scale, GHQ-28 General Health Questionnaire, POMS 2 TMD Profile of Mood States 2nd Edition, Total Mood Disturbance subscale.
  3. The p values represent comparisons between YRC3780 and placebo by Mann-Whitney U test.
  4. ap < 0.05 vs. placebo.
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