• Korean Journal of Exercise Nutrition
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• v.24 no.4
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• pp.15-23
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• 2020

[Purpose] Lactate is a principal energy substrate for the brain during exercise. A single bout of high-intensity interval exercise (HIIE) can increase the blood lactate level, brain lactate uptake, and executive function (EF). However, repeated HIIE can attenuate exercise-induced increases in lactate level and EF. The lactate levels in the brain and blood are reported to be correlated with exercise-enhanced EF. However, research is yet to explain the cause-and-effect relationship between lactate and EF. This study examined whether lactate consumption improves the attenuated exercise-enhanced EF caused by repeated HIIE. [Methods] Eleven healthy men performed two sets of HIIE, and after each set, 30 min were given for rest and examination. In the 2^nd set, the subjects consumed experimental beverages containing (n = 6) and not containing (n = 5) lactate. Blood, cardiovascular, and psychological variables were measured, and EF was evaluated by the computerized color-word Stroop test. [Results] The lactate group had a higher EF (P < 0.05) and tended to have a higher blood lactate level (P = 0.082) than the control group in the 2^nd set of HIIE. Moreover, blood lactate concentration was correlated with the interference score (i.e., reverse score of EF) (r = -0.394; P < 0.05). [Conclusion] Our results suggest that the attenuated exercise-enhanced EF after repeated HIIE can be improved through lactate consumption. However, the role of lactate needs to be elucidated in future studies, as it can be used for improving athletes' performance and also in cognitive decline-related clinical studies.

• Journal of the Korean Applied Science and Technology
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• v.34 no.4
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• pp.827-838
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• 2017

Twenty male soccer players volunteered as the experimental subjects. The subjects were randomly assigned to the "Winter training with Cornus officinalis extract intake group"(WCI; n=10) and "Winter training group"(WT; n=10). The variables of blood fatigue substance, muscle damage and liver function where measured in all the subjects before the start of the Cornus officinalis intake after at the end of the 4 weeks winter training. Winter training program was proceeded with 6 days a week for 4 weeks. Exercise intensity was measured using the HRR(70~95%). Changes in the heart rate were also measured with the Polar. WCI group were ingested 80 mL of Cornus officinalis extract after every breakfast and dinner for 4 weeks. The test data were analyzed by paired t-test, and independent t-test(%diff), and the alpha level of p<.05 was set for all tests of significance. Lactate in WCI group had significantly decreased, and the changes between the groups were significantly lower in the WCI group than in the WT group. Ammonia in WCI group had significantly increased. CK in WCI group had significantly decreased. LDH in both group had significantly decreased. AST in WCI group had significantly decreased, and the changes between the groups were significantly lower in the WCI group than in the WT group. ALT in WCI group had significantly decreased. In conclusion, the results of this study show that Cornus officinalis extract seem to have a positive influence on blood fatigue substance, muscle damage and liver function. Therefore Cornus officinalis extract is considered to be able to contribute an ergogenic aids.

• Korean Security Journal
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• no.21
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• pp.121-134
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• 2009

The purpose of present study was to examine the effects of working time on fatigue and immune function in private security. The number of private guard on which this study has been conducted in 153, who work at large companies, medium or small companies and the like as located in Seoul and kyonggi. In this study blood T-lympocyte, Natural T-Killer cell and immunoglobulin(IgG, IgA and IgM) were measured to see the level of working hours. There was significant difference in Natural T-Killer cell and immunoglobulin(IgG, IgA and IgM) and fatigue between working hours(P<0.05). in view of the results of this study, it can be thought that fatigue and immune function is more affected by working hours In summary, these results are interpreted to mean that fatigue levels and immune function (Natural T-Killer cell, and immunoglobulin) decrease due to a rise in working hours.

• Nutrition Research and Practice
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• v.17 no.4
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• pp.670-681
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• 2023

BACKGROUND/OBJECTIVES: Oxidative stress is caused by reactive oxygen species and free radicals that accelerate inflammatory responses and exacerbate fatigue. Tormentic acid (TA) has antioxidant and anti-inflammatory properties. Thus, the aim of present study is to determine the fatigue-regulatory effects of TA in H₂O₂-stimulated myoblast cell line, C2C12 cells and treadmill stress test (TST) and forced swimming test (FST) animal models. MATERIALS/METHODS: In the in vitro study, C2C12 cells were pretreated with TA before stimulation with H₂O₂. Then, malondialdehyde (MDA), lactate dehydrogenase (LDH), creatine kinase (CK) activity, tumor necrosis factor (TNF)-α, interleukin (IL)-6, superoxide dismutase (SOD), catalase (CAT), glycogen, and cell viability were analyzed. In the in vivo study, the ICR male mice were administered TA or distilled water orally daily for 28 days. FST and TST were then performed on the last day. In addition, biochemical analysis of the serum, muscle, and liver was performed. RESULTS: TA dose-dependently alleviated the levels of MDA, LDH, CK activity, TNF-α, and IL-6 in H₂O₂-stimulated C2C12 cells without affecting the cytotoxicity. TA increased the SOD and CAT activities and the glycogen levels in H₂O₂-stimulated C2C12 cells. In TST and FST animal models, TA decreased the FST immobility time significantly while increasing the TST exhaustion time without weight fluctuations. The in vivo studies showed that the levels of SOD, CAT, citrate synthase, glycogen, and free fatty acid were increased by TA administration, whereas TA significantly reduced the levels of glucose, MDA, LDH, lactate, CK, inflammatory cytokines, alanine transaminase, aspartate transaminase, blood urea nitrogen, and cortisol compared to the control group. CONCLUSIONS: TA improves fatigue by modulating oxidative stress and energy metabolism in C2C12 cells and animal models. Therefore, we suggest that TA can be a powerful substance in healthy functional foods and therapeutics to improve fatigue.

• Journal of the Korean Applied Science and Technology
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• v.37 no.5
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• pp.1314-1322
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• 2020

Sports drinks help optimize and improve performance by delaying and eliminating the buildup of fatigue-causing substances in the body during exercise. Saengmaeg-san is a nature-friendly traditional beverage that has no side effects on the human body and can quench thirst. However, studies on the relationship between exercise ability and Saengmaeg-san are insufficient. The purpose of this study was to prescribe Saengmaeg-san during the summer training period of 4 weeks and to analyze the effect on body composition and exercise performance. Seventeen male participants were divided into 3 groups (Saengmaeg-san acid intake group [n=9], placebo group [n=8]), and body composition (height, weight, muscle mass, fat mass, BMI) and conducted exercise performance (total exercise time and HRmax). In our study, Saengmaeg-san intake had a positive effect on exercise performance, such as decreased body fat percentage, increased exercise time, and decreased HRmax. Therefore, Saengmaeg-san showed the potential as a sports drink. In the future, additional studies on fatigue-related substances, immune function-markers, and blood lipids are needed in order to clearly explain the change in exercise performance due to consumption of Saengmaeg-san.

• Herbal Formula Science
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• v.18 no.2
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• pp.1-14
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• 2010

This report describes 57 prescriptions including Paeoniae Radix and Glycyrrhizae Radix in Dongeuibogam. Paeoniae Radix and Glycyrrhizae Radix have been used separately or concurrently in Oriental Medicine for a long time as a treatment for various disease. The following conclusions are reached through investigations on the applications of prescriptions including Paeoniae Radix and Glycyrrhizae Radix in Dongeuibogam. 1. 7 times(12.3%) prescriptions are recorded in women chapter, 6 times(10.5%) in cold chapter, 5 times(8.8%) in stool chapter and fatigue chapter each, 4 times(7.0%) in psychiatry chapter, which are arranged in order of frequency. 2. Anxiety, Yin-Yang deficiency, stroke, treating blood, cataract, fever floating due to Yin deficiency, weak and fatigue, pregnancy, abortion, women accessary disease, cold-feeling heart pain, stiffness, etc, among 51 symptoms in prescriptions including Paeoniae Radix and Glycyrrhizae Radix. 3. The dosage of Paeoniae Radix and Glycyrrhizae Radix are from 5 pun:2.5 pun to 2 nyang:1 nyang. 1 jeon:5 pun is recored 39 times(68.4%), 2 jeon:1 jeon and 1 nyang:5 jeon is 6 times(3.21%), 2 nyang:1 nyang is 2 times(1.8%) used among 57 prescriptions including Paeoniae Radix and Glycyrrhizae Radix. 4. 57 prescriptions including Paeoniae Radix and Glycyrrhizae Radix are mostly composed of Samooltang and Sagoonjatang, Gyejitang, Gamgiltang, Bowontang, Goongguitang, Jeongwoneum, Bojoongikgitang, Jigoongsan, Ijintang, Pyeongwuisan, Oryungsan, etc, according to the usage.

• PNF and Movement
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• v.6 no.3
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• pp.1-9
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• 2008

Purpose : The purpose of this study was to analyze the reaction of recovery for the fatigue by sports massage treatment after Taekwondo training and then to verify the effectiveness. Subject : The subjects of this study were all the 20 high school Taekwondo players divided into two groups (rest recovery group and sports massage group) selected by systematic random assignment sampling. Method : The variables were the level of hemoglobin, lactic acid and glucose, and measured at rest, immediately-after exercise and 30-minute recovery. The data from this study were analyzed by using one-way ANOVA, independent sample t-test. Results : The results are as follows ; 1. The measurement of the hemoglobin, there was not the significant differences between experiment group and control group. 2. The lactate showed lower in the experiment group than in the control group in 30-minute recovery (p<.001). 3. The glucose showed lower in the experiment group than in the control group in 30-minute recovery (p<.01). So I think the sports massage treatment is more effective in the relief of fatigue than static rest method during the recovery after sports. However the massage treatment influence on the activation of metabolism according to the intensity and the duration of sports, and vary the effect of treatment according to the method and execution time. Therefore the longitudinal investigation of the variation by the long time massage through the more detailed program must be requisite for us.

• Mycobiology
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• v.48 no.6
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• pp.512-517
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• 2020

Cordyceps militaris has been reported to the diverse pharmaceutical effects including cancer, inflammatory diseases, and bacteria or virus infection. However, the effect of C. militaris on exercise performance has not yet been elucidated. In this study, we investigated the beneficial effect of C. militaris on exercise performance. To evaluate exercise performance, we prepared C. militaris ethyl acetate extract (CMEE) and conducted grip strength tests every week after administration. Additionally, blood samples were collected at the end of the experiment for biochemical analysis. The administration of CMEE slightly increased grip strength, and this result was similar to the red ginseng treated group. According to the result of biochemical analysis, CMEE had an effect on the biomarkers related to ATP generation pathway but had little influence on the muscle fatigue related biomarkers. Therefore, C. militaris has the possibility of improving exercise performance, which could be associated with the increase in ATP production rather than the decrease in muscle fatigue during exercise.

• The Journal of Internal Korean Medicine
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• v.43 no.6
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• pp.1219-1228
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• 2022

Objectives: The aim of this study was to report a clinical case of decompensated liver cirrhosis in a patient with jaundice who showed improvement with Korean medicine treatment. Methods: A patient with decompensated liver cirrhosis with jaundice was treated with herbal medicine (Injinoryung-tang, Galgeunjowi-tang), acupuncture, cupping, and moxibustion. Changes in jaundice, fatigue, and dysuria were measured with subjective parameters. Liver function was checked by performing a blood test 8 times. The levels of aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), gamma glutamyl transpeptidase (GGT), total bilirubin (TB), albumin, and platelets (Plt), prothrombin time (PT), and international normalized ratio (INR) were recorded. Results: The Korean medicine treatment improved jaundice, fatigue, and dysuria and lowered the AST, ALT, ALP, GGT, and TB levels. Conclusions: Korean medicine treatment containing Galgeunjowi-tang positively improves clinical symptoms and liver function.

• The Journal of Internal Korean Medicine
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• v.44 no.3
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• pp.544-554
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• 2023

Background: Postural hypotension refers to a drop in systolic blood pressure of 20 mmHg or diastolic blood pressure of 10 mmHg or more within three minutes after standing up from lying down. Symptoms of postural hypotension not only include dizziness and blurred vision but also fatigue, cognitive decline, leg weakness, headache, and, in severe cases, fainting. Postural hypotension is a phenomenon that occurs in about 6% of the total population, and in Korea, the number of patients with postural hypotension is continuously increasing. Both pharmacological and non-drug therapies, which are treatment methods for this disease, do not show a satisfactory symptom improvement effect. Case summary: A 65-year-old male patient who visited the hospital complaining of dizziness and paresthesia due to postural hypotension was treated with acupuncture, moxibustion, and herbal medicine. For symptom evaluation, the numeric rating scale (NRS) of each symptom was used, and blood pressure change according to posture was measured. After treatment, the NRSs of dizziness and dysesthesia were decreased, and blood pressure changes according to posture was improved. Conclusion: This case report suggests that Korean medicine treatment, including acupuncture, electro-acupuncture, moxibustion, and herbal medicine, can be an effective treatment for dizziness with postural hypotension.