The purpose of the present study was to clarify the relationship between physical fitness and judo competition performance in 14 judoists of D University. The data of physical fitness measured by 17variables were put into 5 formulas to estimate five physical fitness elements. Ninety-one games competed between 14 subjects having experience to participate in the league of Intercollegiate judo were selected to determine judo competition performance. The relationship between physical fitness and competition performance was investigated using correlation analysis and also multiple regression analysis was applied to find the validity of these estimating formulas in such way that the competition performance as a criterion might be estimated with these five physical fitness elements as independent variables. Then, the following results were obtained; 1. The judo competition performance showed significant and high correlation with the first element (physique and static muscular strength), and its degree of contribution was 76.0% to total variance of competition performance. 2. The judo competition performance did not show any significant correlation with muscular power of lower limbs, stature and body weight. 3. Negative correlation was shown between muscular power of lower limbs as second element, and body weight and chest girth. 4. It could be inferred that the most important element for the light-weight judoists to win over the heavy-weight was to utilize the power of lower limbs; i. e, the 2nd element and the total body power with agility; i. e, the 3rd element.
The purpose of this study was to investigate the endurance of the neck flexor muscle for trained Judo players estimated from the electromyogram patterns. The subjects in this study were eight trained Judo players and eight collegiate students. Each subject was asked to sustain isometric flexion for neck joint at each force level of 10,30 and 50% of his maximum voluntary contraction (MVC) to exhaustion. The surface EMG was recorded from the m. sternocleidomastoideus. An endurance time, the integrated EMG (IEMG)and the mean power frequency (MPF) were computed from the recorded EMG. The results were summarized as follows: (1) Endurance time for trained Judo players was significantly longer than for collegiate students at each of 10,30 and 50%MVC force levels. (2) The increment ratio of IEMG for each second and the reduction ratio of MPF for each second for trained Judo players were significantly smaller than for collegiate students at each of 10,30 and 50%MVC force levels. Within the limitation of this study, it can be concluded that endurance of the neck flexor muscle for trained Judo players was higher than for collegiate students. Such a result may be due to the effects of the fatigability correlated with muscle fiber composition of the neck flexor muscle for trained judo players.
The findings of the questionnaire given to so-called “first rank judo players” concerning their instructors and method of guidance while they continued to participate in matches are as follows: (1) More judo players have their own private instructors than participants in other types of athletics. The existence of a personal instructor is considered valuable and the period of guidance under a private instructor tended to be during high, school in most cases. (2) Compared with other types of athletics, judo players have mainly been instructed between elementary school and junior high school, and then also between high school age and adulthood. (3) Most judo instructors are school teachers. The remaining instructors are often employed at sports clubs. The number of the instructors at each facility are directory proportional to each other. (4) There are two types of judo instructors. One type is an instructor that is a “king” in practices and during training. Superb leadership and strictness characterize this type. The other type is an instructor who acts as a source of technique and theory. High level techniques and medical knowledge characterize this type. While the former type of instructor gradually gains effectiveness from the elementary school period through the high school period (the peak of effectiveness) he becomes less effective after the peak. However, the latter type tends to be continuously effective as an instructor. (5) Most judo players have met their most influential instructors during their high school years. We can presume from this fact that effective and consistent guidance by high school teachers is very valuable to a judo student.