Male Judokas Research Articles

Ukemi: quantity, rate and distribution in judo training sessions

Introduction: Break-falls (ukemi) are the most frequently used skills in judo training session. This study aimed to analyze the quantity, the rate and distribution of ukemi in training sessions. Materials and Methods: This study was approved by the UDESC Research Ethics Committee (32/2004). Seventy two male Judokas took part of this study (age 22.3±6.7 years-old and time of practice 9.8±5.6 years). A video camera and scout were used. From the records transcribed from the scout it was identified the number of falls per team and per phase of session training (warm-up AQ, without resistance SR, with resistance CR). The data were analyzed by descriptive statistics and analyze of multifactor variance and Scott-Knott test with level of significance set at 95%. Results: Teams showed to be heterogeneous in the number and the rate of falls; the greatest falls occurred in the AQ (17.74) and SR (17.59); the lesser intervals between falls occurred in the AQ (6.7 s). Discussion: The high variability in the number of falls among the teams can be explained by different intensities of training used by different coaches. Lesser numbers of falls and the greater interval between falls in the CR phase may be associated with the technical level similar of judokas at the same team, the fact always trained together or as protection to the body itself.

Effets d’un exercice de type anaérobie sur le statut antioxydant enzymatique au cours de la récupération chez les judokas

Aim To evaluate the effect of the anaerobic exercise on the enzymatic antioxidant statute in judokas’ regional level, because the effects of anaerobic exercise on the free radicals and antioxidants are relatively rare and have some divergences. Materials and methods We made this study on ten male judokas (age = 18.1 ± 1.6 years; weight = 77.2 ± 11.6 kg; height = 176.4 ± 4.6 cm), which carried out 30 seconds anaerobic capacity test (Wingate test). Blood samples were taken, by an intravenous catheter, at rest (R), immediately after the Wingate test (P0) then five minutes later (P5), 10 minutes later (P10) then 20 minutes later (P20). The measured parameters are: the superoxide dismutase (SOD), the glutathion peroxidase (GPx) and the total antioxidant statute (SAT). Results The concentration of the SOD increases significantly ( p < 0.05) at (P0); and regains the baseline values at (P20). The concentration of GPx increases significantly ( p < 0.05) in (P0); in (P10) GPx reaches the baseline values. No significant effect of the anaerobic exercise was observed on the concentration of the SAT. Positive correlation was observed between the SOD and GPx to p < 0.05. Conclusion The anaerobic exercise modifies the activity of the antioxidant enzymes with different kinetics.

Response to Calmet's Comment on Paillard, Et Al. (2005): “Influence of Postural Regulation in Male Judokas' Direction of Falls”

A prior study by Paillard, Montoya, and Dupui showed judokas' direction of fall based on analysis of videos is inversely related to the average position of their centre of foot pressure (measured on a force platform). From this result, Calmet (2006) proposes some suggestions (e.g., the evaluation of balance on a force platform with the two hands bound to a system of pulleys or springs) which could be useful to analyse the judokas' postural strategies and to develop increased awareness of balance. However, several of these different suggestions require additional methodological evaluation before application. Indeed, according to the literature, inclusion of the force exerted onto handles modifies the amplitude of shifts of centre of foot pressure. Moreover, other analyses could be performed to develop descriptions and measures of a faller's behaviour. It would be interesting (i) to analyse the judokas' postural segmental movements during actual matches by kinematics analyses (ii) to study the judokas' balance when presented randomized push actions or pull actions while on a force platform. These suggestions could also constitute new perspectives of research on judo.

Assessment of Maximal Cardiorespiratory Performance and Muscle Power in the Italian Olympic Judoka

The main purposes of this study were to describe the cardiorespiratory fitness and lower limbs maximal muscle power of a selected group of Olympic Italian male (M) and female (F) judokas. Eleven subjects (6 M, 5 F) underwent 3 different tests. The VO(2)max and ventilatory threshold (VT; V-slope method) were assessed during a graded maximal treadmill test. Lower limbs muscle peak power (PP) and mean power (MP) were determined during a 30-second Wingate test (WIN). Post-WIN blood lactate peak was also measured. Subjects were tested also during a 5-minute combat test (CT), during which blood lactate and heart rate (HR) were monitored. VO(2)max (mean +/- SD) was 47.3 +/- 10.9 and 52.9 +/- 4.4 ml x kg(-1) x min(-1) for M and F judokas, respectively. The VT corresponded to 80.8% (M) and 86.5% (F) of VO(2)max. Both PP and MP, measured during the WIN, were significantly higher (p < 0.05) in M than in F judokas (PP: 12.1 +/- 2.4 vs. 9.5 +/- 1.1 W x kg(-1); MP: 5.4 +/- 1.1 W x kg(-1); F: 4.3 +/- 0.5 W x kg(-1)). Post WIN blood lactate peak was 6.9 +/- 2.8 mmol x l(-1) and 6.1 +/- 1.8 mmol x l(-1) for M and F judokas, respectively (not significant). During the CT blood lactate peak was 9.9 +/- 3.0 mmol x l(-1) (M) and 9.2 +/- 2.0 mmol x l(-1) (F); these values being significantly higher than those obtained after the WIN (p < 0.05). In conclusion, Italian Olympic judokas showed high levels of muscle power but accompanied by a moderate engagement of the aerobic metabolic pathway, which is well in accordance with the characteristics of judo. Having these results in top-level athletes may represent a useful contribution to the work of coaches and trainers in optimizing training programs for the achievement of the best performance of the judoka.

Influence of Postural Regulation in Male Judokas' Direction of Falls: Comment on Paillard, et al. (2005)

The survey of Paillard pinpoints three important areas of reflection: what new knowledge is added, what are the internal perspectives, and what are the external perspectives.

Competition and Food Restriction Effects on Oxidative Stress in Judo

We examined the effects of weight loss induced by restricting energy and fluid intake on antioxidant status and oxidative stress of judo athletes. Twenty male judoka were randomly assigned to one of two groups (Group A: called diet, n = 10; height 174.8 +/- 1.9 cm, body weight 75.9 +/- 3.1 kg; they were asked to lose approximately 5 % of their body weight through self-determined means during the week before the competition; Group B: called control, n = 10; height 176.4 +/- 1.1 cm, body weight 73.3 +/- 6.3 kg maintained their body weight during the week before the competition). A battery of tests was performed during a baseline period (T1) on the morning of a simulated competition (T2) and 10 minutes after the end of the competition (T3). These tests included assessment for body composition, determination of lag phase (Lp) before free radical induced oxidation, maximum rate of oxidation (Rmax) during the propagating chain reaction and maximum amount of conjugated dienes (CDmax) accumulated after the propagation phase, and lipidic profile. Uric acid concentrations were also evaluated in plasma. Dietary data were collected using a 7-day diet record. We noted that the athletes followed a low carbohydrate diet whatever the period of the investigation. Concerning antioxidant nutrients, we can notice that mean nutritional intakes are in the normal range values for vitamin A, C and E at T1 and T2. Rapid weight loss induced a significant increase in Lp values (p < 0.05) and uric acid concentrations without alterations in oxidative stress. Our data also showed that the competition induced the same changes of oxidative-antioxidant status whatever the dietary intake during the seven days before the competition. Moreover, the effect of the competition on the antioxidant and oxidant parameters was more pronounced than the diet. Theses results could be linked to the food containing a large proportion of PUFA and a relative low proportion of carbohydrates.

유도 올림피언 허벅다리걸기 기술발휘 시 받기의 자세와 저항수준에 따른 몸통과 하지의 각운동량 분석 사례연구[III

It was to study a following research of "A Kinematical Traits Analysis when Performing Uchimata(inner thigh reaping throw) by Posture and Voluntary Resistance Levels(VRL) of Uke in Judo[1]" and. "A Case Study of Center of Gravity(COG) when Performing Uchimata(inner thigh reaping throw) by Posture and Voluntary Resistance Levels(VRL) of Uke in Judo[II]". The purpose of this study was to analyze an angular momentum of trunk and lower extremity when performing uchimata by two postures and voluntary resistance levels(VRL) of uke(reciver) in Judo. The subjects, who were one male judoka(YH) for 1992 Barcelona Olympic Games Olympian(silver medalist), was filmed on two S-VHS 16mm video cameras(60fields/sec.) through 3-dimensional motion analysis methods, that postures of uke were shizenhontai (straight natural posture:NP) and jigohontai (straight defensive posture:DP), VRL of uke were 0% and 100%, respectively. The variables were angular momentum of trunk, lower extremity of attacking leg and supporting leg of tori(the thrower). The data of this study collection were digitized by SIMI Motion Program computed the mean values and the standard deviation calculated for each variables. When performing uchimata according to each posture and VRL of uke and classifying. From the data analysis and discussion, the conclusions were as follows : Angular momentum of trunk when performing uchimata was showed the largest among another angular momenta, and the posture displayed more different than resistant of uke(reciver), but the pattern similar in judo. Angular momentum of trunk of X axis was the largest and Y, Z axis order. Angular momentum of attacking the thigh-leg when performing uchimata was showed the largest among another angular momenta, and the posture displayed more different than resistant of uke(reciver), X axis and Y axis similar, but angular momentum of Z axis of thigh-leg the largest, in kake(application) event in 0% resistance of DP than other variables. Angular momentum in X,Y axis of attacking the lower-leg when performing uchimata was showed that the resistance level displayed more different than posture, but Z axis the largest, in kake(E3) phase in 0% resistance of DP than other variables as same thigh-leg, and the largest from tsukuri(set-up:E2) to kake(E3) phase. X and Z axis Angular momentum of supporting the thigh-leg were similar, regardless of posture and resistance of uke, but Y axis was resistance level. Angular momentum of supporting the thigh-leg was showed the largest in X axis, increased from EO event to E2, and decreased in E3, and angular momenta of Y, X axis were showed the largest in kuzushi(balance breaking) phase when performing uchimata. Angular momentum of supporting the lower leg were similar pattern, regardless of posture and resistance of uke, in Y axis, resistance displayed more difficult the position in NP, and showed opposite angular momentum in tsukuri phase. In conclusion, angular momentum of trunk when performing uchimata was showed the largest, and pattern was similar, regardless of posture than resistant of uke(reciver), magnitude and direction were different each other, and uchimata was Ashi -waza(foot and leg techniques) division but important of trunk action.

Influence of Postural Regulation in Male Judokas' Direction of Falls

In competitions, judokas tend to have a predominant direction of fall: forwards or backwards. A relationship was hypothesized between the direction of fall and certain parameters of the judokas' postural activities. 20 judokas, 16 to 19 yr. old (17.7 +/- 0.4 yr.), had practised judo for at least seven years. They were separated into two groups. The group of forward fallers (n = 9) and the group of backward fallers (n = 11) performed posturokinetic tests to assess their static and dynamic balance. One parameter assessed through the analysis of postural activities, the average position of anteroposterior dynamic oscillations, was inversely related to the judokas' direction of fall. Postural activities might not play a direct role but perhaps an indirect one in the direction of falls by expert judokas.

Food Restriction, Performance, Biochemical, Psychological, and Endocrine Changes in Judo Athletes

In order to test the hypothesis that dietary restriction may have a negative influence on physiological and psychological adaptation to a judo competition, we examined the effects of weight loss induced by restricting energy and fluid intake on the physiology, psychology, and physical performance of judo athletes. Twenty male judoka were randomly assigned to one of two groups (Group A: called diet, n = 10; height 174.8 +/- 1.9 cm, body weight 75.9 +/- 3.1 kg; they were asked to lose approximately 5 % of their body weight through self-determined means during the week before the competition; Group B: called control, n = 10; height 176.4 +/- 1.1 cm, body weight 73.3 +/- 6.3 kg maintained their body weight during the week before the competition). A battery of tests was performed during a baseline period (T1), on the morning of a simulated competition (T2) and 10 min after the end of the competition (T3). The test battery included assessment for body composition, performance tests, evaluation of mood, determination of metabolic and hormonal responses. Dietary data were collected using a 7-day diet record. The nutrient analysis indicated that all the athletes followed a low carbohydrate diet whatever the period of the investigation. For the Group A, the food restriction (- 4 MJ per day) resulted in significant decreases of the body weight and altered the mood by increasing Fatigue, Tension and decreasing Vigour. Dietary restriction had also a significant influence on metabolic and endocrine parameters and was associated with poor performance. After the competition, significant decreases of the levels in testosterone, T/C ratio, alkali reserve, and free fatty acid were observed in both groups, whereas the plasma concentrations in insulin, ammonia, urea, and uric acid were increased. In conclusion, our results suggest that the combination of energy restriction and intense exercise training, which causes weight reduction before a competition, adversely affects the physiology and psychology of judo athletes and impairs physical performance before the competition. Our data are the first to demonstrate that a competition including five 5-min bouts induced the same changes of physiological and psychological variables and performance whatever the dietary intake (dietary restriction or not) during the seven days before the competition.

유도 허벅다리걸기 기술발휘 시 받기의 자세와 저항수준에 따른 중심변인 분석 사례연구[II

It was to study as a following-research of A Case Study on Center of Gravity(COG) Analysis when Performing Uchimata(inner thigh reaping throw) by Posture and Voluntary Resistance Levels(VRL) of Uke in Judo[I]. The purpose of this study was to analyze the COG variables when performing uchimata(inner thigh reaping throw) by two postures and voluntary resistance levels(VRL) of uke(reciver) in Judo. The subjects, who were one male judoka(YH) for 1992 Barcelona Olympic Games Olympian(silver medalist), and one male trainee; Y.I.University representative member (SDK), and were filmed on two S-VHS 16mm video cameras(60fields/sec.) through 3-dimensional motion analysis methods, that postures of uke were shizenhontai (straight natural posture) and jigohontai(straight defensive posture), VRL of uke were 0% and 100%, respectively. The kinematical variable was COG variable, distance of COG, and distance of resultant COG between uke and tori(the thrower), velocity and acceleration of COG. The data of this study collection were digitized by SIMI Motion Program computed the mean values and the standard deviation calculated for each variables. When performing uchinmata according to each posture and VRL of uke and classifying. From the data analysis and discussion, the conclusions were as follows : 1. Displacement of COG Subject YH, COG was the highest in kuzushi(balance -breaking), vertical COG was low when following in tsukuri(positioning; set-up), kake(application; execution), and COG was pattern of same character each postures and resistance, respectively. Subject SDK, COG was low from kumikata(engagement positioning) to kake, and COG was that each postures and resistance were same patterns, respectively. Subject YH, SDK, each individual, postures and resistance, vertical COG was the lowest in kake phase, when performing. 2. Distance of COG between uke and tori The distance of COG between uke and tori when performing, subject YH was in kumikata, in kake, and SDK was in kumikata, in kake. SDK was wider than YH. 3. Distance of resultant COG between uke and tori The distance of resultant COG between uke and tori when performing, subject YH was from kumikata to kake. and SDK was in kumikata, in kake. Jigohontai(YH:,SDK:) was more moved than shizenhontai(YH:, SDK: ). 4. Velocity of COG The velocity of COG when performing uchimata, subject YH was fast anterior-posterior direction in kuzushi, ant.-post. and vertical direction fast in tsukuri and kake. SDK was lateral, ant.-post. and vertical direction in kuzushi, ant.-post. and vertical direction in tsukuri and ant.-post. direction in take, respectively. 5. Acceleration of COG The acceleration of COG when performing uchimata, The trend of subject YH was showed fast vertical direction in kuzushi and tsukuri, ant.-post. and vertical direction fast in kake. The trends of SDK showed lateral direction in kuzushi, lateral and ant.-post. direction in tsukuri and ant.-post. direction in kake, respectively.

Stressinduzierte Aufmerksamkeitsänderungen beim Würgen im Judo

The aim of the investigation is the registration and analysis of cognitive parameters in the alarm phase of the stress reaction during a conventional judo cross choking technique. 57 judoka (41 males, 16 females; mean age 23.1 +/- 6.7 years) underwent a standardized cross-choking maneuvre (juji-jime), which lasted for 6 - 8 s until giving up, carried out by a black belt physician. The Stroop inference test was performed before and twice after the intervention. The reading velocity of the interference task was reduced by an average of 77.4 s to a mean of 74.4 s (p < 0.01), and the number of reading errors decreased by a mean from 2.9 to 2.1 (p < 0.01), finally increasing to 2.4 s. The data show the most important improvement in performance in 25 s after choking in the male judoka. In the female judoka increasing performance started already 25 s before choking and continued 25 s after the intervention. The alarm reaction following the potential life threatening stressor with an attack upon the throat improves selective attention before (female subjects) and after choking (female and male subjects) depending on gender.

유도 단계별 측방낙법의 운동학적 변인 비교분석[ I

The purpose of this study was to analyze the comparisons of the kinematical variables when performing Yoko Ukemi(side breakfall) by three Stage in Judo. The subjects were four male judokas who were trainees Y. I. University Squad members and the Yoko Ukemi were filmed by two S-VHS 16mm video cameras(60fields/sec.). The selected times were subject to KWON 3D analysis program and kinematical analysis to compare variables of three Yoko Ukemi. Temporal variables(total time-required : TK, TR by each phase), the body part touched order on the mat and COG variables were computed through video analysis while performing right Yoko Ukemi by three stage. From the data analysis and discussion, the following conclusions were drawn : 1. Temporal variables : total time-required(TR) when performing Yoko Ukemi(side breakfall) by each stage, the first stage(full squat posture: FP : 1.11sec.) showed the shortest time, the next was 3rd(Shizenhontai, straight natural posture: NP : 1.41sec.), and 2nd(Jigohontai, straight defensive posture, DP : 1.42sec.), respectively- 2. TR when performing Yoko Ukemi(side breakfall) by each stage, and phase : the first phase(take of phase, average 0.68sec.) showed the longest time, next was the third phase(ukemi phase, 0.39sec.), and the second phase(air phase, 0.23sec.), respectively. 3. When performing yore Ukemi the body part touched order and TR on the mat : hip(0.94sec.) showed the shortest time, the next was elbow hand(0.97sec.), back(0.98sec.), and shoulder(1.04sec.) order. The hip part touched on the mat the first, but slap the mat in order to alleviate the shock try hand palm and forearm before receiving impact (difference 0.03sec,) 4. Vertical COG variables in each event by each stage : e1(ready position, average 78.33cm) moved the highest, the next was e2(jumping position, 70.14cm), e3(transition position, average 64.00cm), e4(landing position, average 35.99cm), and e5(ukemi position, average 18.32cm) order, gradual decrease respectively. And the difference of COG were showed in initial by each stage, because position fo Yoko Ukemi was difference by each stage in preparation position, but in accordance with executing of Ukemi phase that difference of COG was by decreasing, almost equal displacement in e4(landing) and e5(Ukemi)position finally.

유도 허벅다리걸기 기술발휘 시 받기의 자세와 저항수준에 따른 운동학적 특성 분석 사례연구[ I

The purpose of this study was to analyze the kinematical traits variables when performing Uchimata(inner thigh reaping throw) by Voluntary Resistance Levels(VRL) and two postures of Uke in Judo. The subjects, who were one male judoka(YH) for 1992 Barcelona Olympic Games, and one male trainee Y. I. University representative member(SDK) and were filmed on two S-VHS 16 mm video cameras(60fields/sec.), that posture of Uke were Shizenhontai(straight defensive posture) and Jigohontai(straight natural posture), VRL of Uke were 0% and 100%. The kinematical variables were temporal(total time-required: TR), potures and COG variables etc., The data of this study collection were digitized by SIMI Motion Program computed the mean values and the standard deviation calculated for each variables. When performing according to each posture and VRL, from the data analysis and discussion, the conclusions were as follows : 1. Temporal variables total time-required(TR) when performing Uchimata was shown the shortest time YH than SDK by each posture and VRL. TR of each posture were shown the shorten trends or equal in DP by lower than NP, In existence and / or nonexistence of VRL was shown the shorten trends in VRL 0% than 100% of Uke. 2. Posture variables : In attacking right knee angle, YH was performing flexion(<TEX>$147{\rightarrow}103degree$</TEX>) from Tsukuri(set-up) to Kake(execution) in regardless of postures and VRLs, SDK was performing not exchange extension and flexion in VRL 100%, and extension(<TEX>$120{\rightarrow}142degree$</TEX>) in VRL 0%, respectively. In supporting left hee angle, YH was performing extension(<TEX>$119{\rightarrow}163degree$</TEX>) from Tsukuri(set-up) to Kake(at(execution) in regardless of postures and VRLs, SDK extension(<TEX>$93{\rightarrow}139degree$</TEX>), respectively. In attacking right hip angle, from Tsukuri to Kake, YH was performing extension(<TEX>$133{\rightarrow}169degree$</TEX>), except in VRL 0%(<TEX>$156{\rightarrow}137degree$</TEX>) NP, SDK was performing flexion(<TEX>$159{\rightarrow}126degree$</TEX>) accept in VRL 100%(<TEX>$149{\rightarrow}152degree$</TEX>) NP, In left hip angle, from Tsukuri to Kake, YH was performing flexion NP(70, 50degree) more than DP(27, 57degree), SDK was performing flexion DP(73, 52degree) more than NP(34, 20degree). 3. COG variables : When performing Uchimata, vertical COG variables was shown YH(:<TEX>$2{\sim}8cm$</TEX>), SDK(:<TEX>$15{\sim}24cm$</TEX>) lower than Uke's COG level position, in existence and / or nonexistence of postures and VRL, during Kake as maximum force point of throwing techniques in Judo.

Gain in thigh muscle strength after balance training in male and female judokas

In a previous study, balance training yielded a gain in strength in middle-aged men and women [6]. However, whether such training can yield positive results in highly conditioned athletes has not been addressed. A group of 10 male and 10 female judokas volunteered for a 6-week balance training on rolling boards, pegtops, soft mats and large rubber balls 3 times per week. Pre- and post training of two-legged balance was measured on a stabilometer, one-legged standing time on a narrow rim and bilateral isokinetic strength at 60°/s concentric and eccentric modes, 120°/s concentric mode and isometrically for the knee extensors and flexors. Except for concentric movement at 60°/s in women, significant improvements in strength were indicated. It is therefore concluded that balance training may be useful for both male and female judokas for increasing strength and balance.

유도 맞잡기 타입에 따른 허벅다리걸기의 Kinematic 분석[I

The purpose of this study was to analyze the kinematic variables when Uchi-mata(inner thigh reaping throw) performing by Kumi-kata(engagement position, basic hold) types A, B(A: grasping part-behind neck lapel, B: chest lapel) in Judo with three dimensional analysis technique DLT method by videography. The subjects were four male judokas who have been training in Yong-In University(YIU), on Korean Representative level and Uchi-mata is their tokui-nage(favorite technique), the throwing form was filmed on two S-VHS 16mm video camera( 30frame/sec. Panasonic). Kinematic variables were temporal, posture, and COG. The data collection was performing by Uchi-mata. Six good trials were collected for each condition (type A, B) among over 10 trials. The mean values and the standard deviation for each variable were obtained and used as basic factors for examining characteristics of Uchi-mata by Kumi-kata types. The results of this analysis were as follows : 1) Temporal variables The total time elapsed(TE) by Uchi-mata of types A, B were 1.45, 1.56 sec. respectively. Types A shorter than B. 2) Posture variables In performing of Uchi-mata, the range of flexion in type A, left elbow was <TEX>$45^{\circ}$</TEX> and B was <TEX>$89^{\circ}$</TEX> from Event 2(E2) to Event 6(E6). Type A and B were quite different in right elbow angle in Event1(E1). Left shoulder angle of type A was extended and type B was flexed in E4. Both types right shoulder angles were showed similar pattern. Also both hip angles(right/left) were showed similar pattern. When type A performed Uchi-mata the knee-angle of supporting foot showed <TEX>$142^{\circ}$</TEX>in the 1st stage of kake phase[KP], and extended to <TEX>$147^{\circ}$</TEX>in the 2nd stage of KP. And the foot-ankle angle of supporting foot showed <TEX>$83^{\circ}$</TEX>in the 1st stage of KP, and extended to <TEX>$86^{\circ}$</TEX>in the 2nd stage of KP. moreover, The knee angle of attacking foot showed <TEX>$126^{\circ}$</TEX>in the 1st stage of KP, and extended to <TEX>$132^{\circ}$</TEX>in the 2nd stage of KP, and the foot-ankle angle of attacking foot showed <TEX>$106^{\circ}$</TEX>in the 1st stage of KP, and extended to <TEX>$121^{\circ}$</TEX>in the 2nd stage of KP. When type B performed Uchi-mata the knee-angle of supporting foot showed <TEX>$144^{\circ}$</TEX>in the 1st stage of KP, and extended to <TEX>$154^{\circ}$</TEX>in the 2nd stage of KP. And the foot-ankle angle of supporting foot showed <TEX>$83^{\circ}$</TEX>in the 1st stage of KP, and extended to <TEX>$92^{\circ}$</TEX>in the 2nd stage of KP. moreover, The knee angle of attacking foot showed <TEX>$132^{\circ}$</TEX>in the 1st stage of KP, and extended to <TEX>$140^{\circ}$</TEX>in the 2nd stage of KP, and the foot-ankle angle of attacking foot showed <TEX>$103^{\circ}$</TEX>in the 1st stage of KP, and extended to <TEX>$115^{\circ}$</TEX>in the 2nd stage of KP. During Uchi-mata performing, type A showed pulling pattern and type B showed lift-pulling pattern. As Kumi-kata types, it were different to upper body(elbow, shoulder angle), but mostly similar to lower body(hip, knee, ankle angle) on both types. 3) C. O. G. variables When the subjects performed Uchi-mata, COG of type A, B up and down in vertical aspect was 71cm, 73.8cm in height from the foot in the 2nd stage of KP. As Kumi-kata types, it were different on medial-lateral direction aspect but weren't different in Kuzushi phase on vertical direction aspect.

Étude comparative de l'analyse spectrale de la fréquence cardiaque au cours de l'exercice sur ergocycle et de l'entraı̂nement en judo

Aim – Heart rate comparative study by spectral analysis between a 6 minutes judo randori et a 4 minutes ergocycle exercise at V̇O2MAX.Materials and methods – By ten male judokas, both time series were analyzed by short term Fourier transform (time/frequency analysis). Each 512 RR time series drawn from ECG was subdivided by Hanning windowing in 13 samples of 128 values (32 RR periods step). For each sample, both exercise types, means of the ten spectrograms have been computed, yielding two mean spectrograms for each sample.Results – 1) Despite a near maximal heart rate (HR) level between the two exercise types, the spectral energy computed from judo randori was significantly more important than ergocycle spectral energy. This phenomenon yields a qualitative effect of the exercise type (judo or ergocycle) on HRV. 2) the normalized spectral powers of low frequency and high frequency bands respectively, were not significantly different between both exercise types.Conclusion – The autonomie nervous control on HR would depend rather on exercise load than on exercise type.

Weight Cycling in Competitive Judokas

It has been suggested that weight cycling may lead to physiological adaptations that cause resistance to future weight loss. Athletes who compete in judo represent an athletic model of weight cycling. Two matched groups of male judokas were observed: weight cyclers (n = 9) and noncyclers (n = 9). Resting energy expenditure, skinfold and girth measures, serum glucose, insulin and triiodothyronine levels, and 3-day dietary intakes were determined three times within a 1-year period. The weight cyclers lost 4.1 ± 1.5 kg (mean ± SD) an average of 4.2 ± 2.7 times per season and quickly regained the weight between competitions. There was no significant difference in metabolic or biochemical parameters between groups during any of the three test sessions. This study suggests that there is no prolonged effect of weight cycling in this athletic population.

Lower limb dimensions, segmental and segmental bone masses and leg mechanical power in Nigerian male elite judokas

Lower limb dimensions, segmental and segmental bone masses and leg mechanical power in Nigerian male elite judokas