Abstract
Fatigue caused by summer heat is a typical indefinite complaint along with anorexia, loss of sleep, stress, lack of motivation and, in some cases, catching a cold. Yogurt fermented with Lactobacillus delbrueckii subsp. bulgaricus OLL1073R-1 has been shown to stimulate the immune system and reduce the risk of catching colds. Here, we conducted a randomized, double-blinded, placebo-controlled trial to investigate whether ingesting this yogurt could ameliorate summer heat fatigue in 49 healthy males (median age 40.0 ± 6.0 years; 30–49 years) who felt fatigued every summer. Fatigue was evaluated by visual analogue scales (VAS) and the balance of sympathetic/parasympathetic nervous systems. After 12 weeks of ingestion in early autumn, the VAS fatigue scores in the yogurt group were lower than those of the placebo group. These results indicate that yogurt fermented with L. bulgaricus OLL1073R-1 can ameliorate summer heat fatigue lasting up to early autumn.
Highlights
Global warming is a world-wide problem that affects the health and productivity of working individuals [1]
We evaluated the effects of yogurt fermented with L. bulgaricus OLL1073R-1, which contains immunostimulatory EPS, on fatigue in the period between the summertime and early autumn
This study suggests that yogurt fermented with L. bulgaricus OLL1073R-1 ameliorates summer heat fatigue and has the potential to affect the autonomic nervous system
Summary
Global warming is a world-wide problem that affects the health and productivity of working individuals [1]. High temperatures in the summer increase the incidence of death by heatstroke and are expected to increase summer heat fatigue, recognized as symptoms resulting mainly from the dysfunction of the autonomic nervous system, such as chronic fatigue, anorexia, loss of sleep, stress, lack of motivation and so on. Dysfunction of the immune system is expected to occur similar to that in patients with chronic fatigue syndrome [2] but it still remains unclear. Some of the active components were expected to be polysaccharides [9,10], and polysaccharides purified from fungi, marine algae, and green tea were shown to exhibit anti-fatigue effects in animal studies after physiological challenges such as swimming and running [11,12,13]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
