Effects of 8-week ingestion of Lactococcus lactis H61 supplements on stress status in collegiate baseball players

Effects of Lactococcus lactis H61 supplementation on conditioning indices - The effect of Lactococcus lactis H61 on stress status

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000055377

Enrollment

Registered

2024-08-30

Start date

2024-08-30

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Collegiate baseball players

Interventions

8-week placebo ingestion 8-week ingestion of Lactococcus lactis H61 supplements

Eligibility

Sex/Gender

Male

Inclusion criteria

Inclusion criteria: 1) Who belongs to the baseball club of the University of Tsukuba 2) Who has not habitually utilized commercial supplements or beverages that contain Lactobacillus or gamma-amino butyric acid 3) Who does not have lactose intolerance 4) Who does not habitually smoke 5) Who does not habitually take medicine 6) Who can consent to participate in the study

Exclusion criteria

Exclusion criteria: 1) Who cannot comply with the study protocol 2) Who receives vaccination during the study period

Design outcomes

Primary

Measure	Time frame
Salivary secretory immunoglobulin A levels	—

Secondary

Measure	Time frame
1) Salivary cortisol levels 2) Stress markers in facial hair 3) Subjective fatigue status 4) Sleep quality 5) Subjective mood status	—

Countries

Japan

Contacts

Public ContactKeisei Kosaki

University of Tsukuba Institute of Health and Sports Science

kosaki.keisei.gm@u.tsukuba.ac.jp+81-29-853-5990

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026