Backgrounds : The one of the leading factors of deteriorating condition is upper respiratory tract infections (URTI) in athletes. Athletes who are forced in regularly intensive training often decrease salivary secretory immunoglobulin A (SIgA) which has important role of immune function in the buccal cavity. It causes increase of morbidity risk in URTI. Acupuncture treatment is one of the conditioning methods in the competition field and mainly treated for orthopedic injuries. On the other hands, acupuncture treatment induced increase of natural healing ability which involved immune response, and prevent and treat some diseases. It has been reported acupuncture increase SIgA level. However, the relationship between time course and diagnostic of cold by the acupuncture stimulation effect is still unclear. Thus, the purpose of this measurement is to investigate the effect of acupuncture stimulation on the SIgA during training camp. Furthermore, it is important to investigate questionnaire about diagnostic of cold during and 1 week after training camp, it leads to clear the effect of acupuncture stimulation on the URTI.
Methods : Eighty subjects men who have auditory difficulties (26.7±0.9 yr[±SE]) participated in this study. The subjects were randomly assigned two groups; acupuncture group and control group. The training camp conducted 3 days and training performed 3 hours each in the morning and afternoon. Acupuncture stimulation was applied at LU 6 (Kongzui), LI 4 (Hegu), ST 36 (Zusanli), and ST 6 (Jiache), for 30 min after dinner. To measure SIgA level, saliva samples were taken 7 times; daytime and evening of first day (Day1(D), Day1(E)), morning, daytime and evening of the second day (Day2(M), Day2(D), Day2(E)), morning and daytime in the third day (Day3(M), Day3(D)). The questionnaire about diagnostic of cold was conducted Day1(D), Day2(M), Day3(M) and 1 week after training camp.
Results : The secretion rate of SIgA in the control was not significantly changed during training camp. However, the acupuncture group was significantly higher level in the Day2(M) and Day3(M) compared to the Day1(D) (P<0.05). Both control and acupuncture group was significantly higher SIgA concentration in Day2(M) and Day3(M) compared to the Day1(D) (P<0.05), but acupuncture group was significantly higher in the Day3(M) compared to the control. The frequency of diagnostic cold was 1 in the acupuncture group and 4 in the control group. Moreover, 1 week after training camp, 6 in the acupuncture group and 6 in the control.
Conclusion : Acupuncture stimulation induced significant increase SIgA level during training camp. Moreover, the diagnostic of cold was lower during training camp in the acupuncture group. Therefore, acupuncture stimulation might reduce the risk of the morbidity of the URTI.

A study was carried out to examine the effects of water replacement on cardiovascular function during kendo practice in a hot environment. Five male college kendoists performed moderately severe 30-min kendo practice at a WBGT index of about 27°C with and without water intake. For water replacement, the subjects ingested 700 ml water (500 ml before exercise and 200 ml at 15 min after the start of exercise) . Under both conditions, body weight was decreased significantly, and hematocrit and serum total protein concentration were increased significantly after the exercise. With water replacement, the body weight loss induced by the exercise was similar to that under water deprivation. However, the decrease in body weight from the basal body weight, i. e. body weight measured before water intake, was significantly less with water replacement than under water deprivation. There were no significant differences in the percentage increases of hematocrit and serum total protein concentration between the two conditions, although the percentage change in plasma vasopressin concentration was significantly lower with water replacement than without. In the subjects deprived of water, the left ventricular end-diastolic dimension and left atrial dimension were significantly reduced after the exercise, and stroke volume, ejection fraction, and fractional shortening were also decreased significantly. The ratio of left ventricular end-systolic wall stress to left ventricular end-systolic volume index was increased significantly after the exercise without water intake. With water replacement, however, the percentage decreases in cardiac dimensions, stroke volume, ejection fraction, and fractional shortening were significantly lower than those under water deprivation. There was no significant change in the ratio of left ventricular end-systolic wall stress to left ventricular end-systolic volume index before and after the exercise with water intake. It is suggested that 700 ml water replacement before and during kendo exercise in a hot environment prevents depletion of stroke volume and deterioration of cardiovascular function, although it might not improve significantly the plasma volume loss after exercise.

This study was carried out to examine the influence of mouthguards on speech intelligibility. Nine male rugby football players with normal personal occlusion and normal speech served as subjects. All players took the speech intelligibility test while wearing self-adapted mouthguards, custom-made mouthguards and without wearing mouthguards.
The ratio of correct judgments for speech intelligibility wearing self-adapted mouthguards was significantly lower than that of wearing custom-made ones or of not wearing one. When misjudged syllables were evaluated by using the manner of production for articulation, plosives had a tendency to be misjudged as flapped sounds or as other plosives while subjects were wearing self-adapted and custom-made mouthguards. When misjudged syllables were evaluated by the points of production for articulation, bilabials and velars had a tendency to be misjudged as alveolar sounds while subjects were wearing self-adapted and custom-made mouthguards, and alveolar sounds had a tendency to be misjudged as various sounds while subjects were wearing self-adapted ones.
The findings showed that speech intelligibility with custom-made mouthguards was better than with self-adapted ones. Speech intelligibility may be better with mouthguards with reduced palatal thickness than with the current ones because points of prodution for alveolars and velars approach the normal points.

This study was conducted to examine the effects of different types of swimming on vision, including contrast sensitivity, depth perception, static visual acuity, number of eyeblinks, and pain scale. Six college water-polo players swam (A) at a water flow rate of 0 m·sec^-1 with floating, (B) at 0.83±0.04 m·sec^-1 with floating, (C) at 1.09±0.05 m·sec^-1 with floating, (D) at 0.83±0.04 m·sec^-1 doing the front crawl (50%VO₂max), and (E) at 1.09±0.05 m·sec^-1 doing the front crawl (80%VO₂max) for 15 min on a swimmill. To avoid the effect by chlorine, the free radical residual chlorine concentration was fixed at 0 ppm in the swimmill.
We found no significant differences in vision before and after A. On the other hand, contrast sensitivity during the test decreased significantly in C and E (p<0.05) . Depth perception and number of eyeblinks increased significantly in C and E (p<0.05) . Subjects had a high pain scale in C and E (p<0.01) . Thus it seems that water flow may disturb of vision. We conclude that it is impor. tant for swimmers to prevent impairment of vision.

[Objective] The purpose of this study was to determine whether icing treatment has an effect on muscle reaction time and functional performance of a sprained ankle. [Methods] Subjects were six persons (healthy group) and six persons who had an acute ankle sprain (patient group) . Anterior talar translation and talar tilt of the six patient group were evaluated by the stress X-ray measure. Ice treatment was applied for 20 minutes. [Results] The following points were clarified : 1) Reaction times of peroneus longus (PL) and peroneus brevis (PB) for the sprained ankle group (SA) were significantly longer than those for the non-sprained ankle group (NA) (p<0.05) . Length of time of standing on one leg with closed eyes for SA was significantly shorter than for NA (p<0.05) . 2) After icing treatment, reaction time of PL for SA tended to be shorter. Furthermore, PB significantly decreased after icing treatment (p<0.05) . Side-steps for SA were significantly increased after icing treatment (p<0.05) . 3) Reaction times of PL and PB for NA significantly increased after icing treatment (p<0.05) . Standing on one leg with closed eyes for NA significantly decreased after icing treatment (p<0.05) . [Conclusion] It was shown that icing treatment of a sprained ankle leads to a shorter muscle reaction time and an increase in the number of side-steps. Therefore, it was concluded that icing treatment of a sprained ankle might be able to improve incapacitated neuromuscular function and functional performance by acute trauma.

Infection is the major cause of health impairment in elderly persons. Immune function declines with age. In order to keep the elderly in good health, it is necessary to control the age-associated decline of their immune function. Components of a non-specific immune system arc neutrophils, macrophages and NK cells. A specific immune system is composed of T lymphocytes and B lymphocytes. T lymphocytes differentiate in the thymus. Age-associated atrophy of the thymus causes a decline in T lymphocyte function. It is essential in aging of the immune system. B lymphocytes produce immunoglobulin to act as antibodies. With aging, abnormal antibodies such as autoantibodies and monoclonal immunoglobulin increase, and the number of normal antibodies compared to foreign antigens decrease. Exercise influences the autonomic nervous system, hypothalamo-hypophyseal system, and immune system. Moderate exercise enhances immune function, and severe exercise causes immune function decline. Immune function declines after a severe single bout of exercise, and an “open window” of infections occurs. Appropriate exercise training may improve immune function. Recently, it was shown that exercise training for one year increased the contents of secretory immunoglobulin A in saliva in elderly persons. This result suggests that long-term exercise training improves immune function in elderly persons.

The purpose of this study was to investigate differences between underwater and land-based exercise in leg muscle activity. Nine healthy males (mean age : 21.7±0.5 years, mean height : 173.4±2.2 cm) had electrodes placed on their left leg muscles (Tibialis Anterior ; TA, Medial Gastrocnemius ; MG, Soleus ; SOL, Rectus Femoris ; RF, and Biceps Femoris ; BF), and their muscle activity was measured during various exercises. The subjects performed six types of exercise such as the forward walk, backward walk, squat, calf raise, leg range, and one leg wave, both in the water (waist level) and on land. These exercises were categorized as 3 types of leg movement according to direction ; horizontal, vertical, and mixed movement.
In the forward walk and backward walk, categorized as horizontal movements, the integrated electromyogram (IEMG) significantly increased during underwater exercise compared with on land. In the squat, as a vertical movement, the IEMG showed a similar change under both conditions. In the calf raise, as a vertical movement, and leg range and one leg wave, as mixed movements, the IEMG significantly decreased during underwater exercise compared with on land. These results suggest that leg muscle activity during underwater exercise is different based on the movement direction of the legs. In a word, it was apparent that movement in a horizontal direction underwater provides greater activity for leg muscles than on land; but movement in a vertical and/or mixed direction underwater provides less activity for leg muscles than on land. In prescribing an exercise program, it may be helpful to understand the differences between underwater and land-based exercise in leg muscle activity.