The Effect of Repeated-sprint Training on The Speed-endurance of Basketball Players in Hypoxia Environment / 中国运动医学杂志

Objective To observe the effect of a repeated-sprint training on the speed-endurance of basketball players in a hypoxia environment.Methods Sixteen basketball players were divided into a hypoxiagroup and a normoxia group which had 8 persons each group.The 2 groups separatelyhad a repeated-sprint training with anaerobic power bicycles in a simulatedhypoxic environment at the altitude of 3000 meters and a normoxia environment for 4 weeks(twice a week).Before and after the training,the two groups of subjects had a shuttle run testing and a Wingateanaerobic powertestingin a normoxia environment.Then their blood were collected and measured the blood lactate level at the point-intime of after the shuttle run,3 min later,5 min later,7 min later,and 9 min later.Recorded the result of the shuttle run,the relative average power of the Wingateanaerobic powertesting,and carried on a statistic analysis of the data.Results Comparing with the performance of the shuttle run before the training,the performance of the 2 groups was improved obviously after the four-week-long training (P＜0.05).But there was no significant difference between the 2 groups(P＞0.05).The rate of blood lacticacid clearance in the hypoxia group was higher than that in the normoxia group,and there was a significant difference at 7 min (P＜0.01).The relative average power of the hypoxia group had a significant improvement(P＜0.05),while the normoxia group had no significant change(P＞0.05).There was no significant difference of the relative average power between the two groups.Conclusion Repeatedsprint training can improve basketball players' speed-endurance.Repeated-sprint training in a hypoxic environment can effectively improve basketball players' ability of reducing blood lactate in their body,and the improvement of this aerobic ability can help athletes to have a better performance in competitions.

Método pedagogía de las situaciones: su influencia en la toma de decisiones de la fase de ataque de jugadoras de baloncesto / Método pedagogia das situações: sua influência na tomada de decisões da fase de ataque de jogadoras de basquete / Positions pedagogy method: its influence in the making of decisions of female basketball players during the offensive phase

Esta investigaci¢n evalu¢ la influencia del M‚todo Pedagog¡a de las Situa- ciones (MPS), (propuesta de Bl zquez, 1986), sobre la toma de decisiones de jugadoras de baloncesto universitario. Para la toma de decisiones, se aplicaron las sugerencias de Refoyo (2001) e Iglesias (2005). En el estudio participaron 24 sujetos, divididos en grupo experimental y grupo control. Los resultados mostraron que el m‚todo Pedagog¡a de las Situaciones (MPS) produjo cambios significativos en la toma de decisiones en la acci¢n dos contra uno. Estos cambios se pueden explicar por la modificaci¢n de toma de decisiones como consecuencia de las repeticiones realizadas du- rante la fase experimental del presente trabajo.

This research evaluated the influence of the Positions Pedagogy Method (PPM) (suggested by Bl zquez, 1986) on female college basketball players at the time of making decisions. For decisions making, Refoyo’s (2001) and Iglesias’ (2005) suggestions were applied. 24 subjects participated in this study; the participants were divided into two groups, one experimental group and one control group. The results showed, that the positions pedagogy method (PPM) produced significant changes in the decisions making on the action two against one. These changes can be explained by the modification in making decisions (cortical areas), as a result of the repetitions performed during the experimental phase of this work.

Esta investiga‡Æo avaliou a influˆncia do M‚todo Pedagogia das Situa‡ães (MPS), (proposta de Bl zquez, 1986), sobre a tomada de decisães de jogadoras de basquete universit rio. Para a tomada de decisães, aplicaram-se as sugestães de Refoyo (2001) e Iglesias (2005). No estudo participaram 24 pessoas, divididas em grupo experimental e grupo controle. Os resultados mostraram que o M‚todo Pedagogia das Situa‡ães (MPS) produziu altera‡ães significativas na tomada de decisães na a‡Æo dois contra um. Estas altera‡ães podem ser explicadas pela modifica‡Æo de tomada de decisães como consequˆncia das repeti‡ães realizadas durante a fase experimental do presente trabalho.

EFFECTS OF PLYOMETRICS ON THE ABILITIES OF THE JUMP, FOOTWORK AND THE CHEST PASS IN COMPETITIVE BASKETBALL PLAYERS / 体力科学

The purpose of this study was to determine the effects of plyometrics on jump, footwork and chest pass ability in competitive basketball players. Ten male basketball players competing at the college level in Japan practiced plyometrics by using the drop jump and the medicine ball throw three sessions per week for seven weeks. All players had continued regular training and competition in basketball over ten years. Height and contact time of the rebound drop jump and the jump shot were tested for each player along with sprint running velocity in a straight direction and with four footwork phases for changing direction, ball velocity and contact time of hands for chest pass pre and post plyometrics. Drop jump training significantly shortened contact time but did not enhance jumping height of the jump shot with a basketball. Moreover, drop jump training significantly shortened average velocity of sprint running with four footwork phases for changing direction, but did not enhance sprint running in a straight direction. Medicine ball training significantly enhanced ball velocity and contact time of hands for the chest pass. These results suggest that plyometrics, by using the drop jump and medicine ball throw, are effective training methods for improving jump, footwork and chest pass ability in competitive basketball players.

BODY COMPOSITION EVALUATED BY SEGMENTAL BIOELECTRICAL IMPEDANCE ANALYSIS IN HEALTHY SUBJECTS AND ATHLETES / 体力科学

The purpose of this study was to evaluate the fat-free mass (FFM) of the total body, the upper limbs, and the lower limbs in healthy subjects and basketball players obtained by the new 8-electrode segmental bioelectrical impedance analysis (S-BIA) and to compare the results with the FFM obtained by DXA. The participants were 30 healthy subjects (15 men and 15 women) aged 24.9±3.5 years old and 15 female basketball players aged 23.1±3.1 years old. In the healthy subjects, positive correlations (p<0.001) were observed between the FFM obtained by S-BIA and DXA of the total body (r=0.973), the upper limbs (r=0.956), and the lower limbs (r=0.954). Similarly, in the basketball players, positive correlations (p<0.001, p<0.01) were observed between the FFM obtained by S-BIA and DXA of the total body (r=0.943), the upper limbs (r=0.743), and the lower limbs (r=0.934). The results suggest that the new 8-electrode S-BIA is a valid and convenient method for analyzing body composition of the total body and the body segments in healthy subjects and athletes.

The Chronergy of Ankle Taping in Basketball Players / 中国运动医学杂志

5 years)from a basketball team before and after tapping,as well as every 10 minutes of playing.Exercise intensity is determined in accordance to 80% intensity(average of six matches) of China National Men Basketball Team performed at Beijing Olympic Games.Results Data show that ankle tapping restricts ankle ROM from the beginning of playing(P 0.05).Conclusion The protective effect of ankle taping is weakening with the prolongation of playing,and thus it's necessary to have a second taping at the halftime of the basketball game.

Study on Jumper's Knee: Symptom and Diagnostic Method by Using MRI and Ultrasonography in Basket Ball Players

OBJECTIVE: To assess the jumper's knee for the symptoms and diagnostics by MRI and ultrasonography in basket ball players. METHOD: Twenty knees of 10 basketball players with chronic knee pain were assessed by the history taking, physical examination and diagnosis by magnetic resonance imaging and ultrasonography. Their average age was 17.4 years. Stanish classification is used for grading the symptoms of jumper's knee. RESULTS: Nine proximal patellar tendons were diagnosed as jumper's knees (45%) and 11 distal tendons were diagnosed as jumper's knees (55%). In ultrasonographic findings, average proximal patellar tendon thickness was 4.5 mm+/-1.2 mm, and distal patella tendon thickness was 7.1+/-1.1 mm. Sensitivity was 63% (12/19) and specificity was rated as 100% (21/21). By the MRI findings, sensitivity was rated as 32% (6/19) and specificity was rated as 90% (16/21). Study between the patient's clinical severity level by Stanish classification and thickness of patellar tendon showed no significant correlation (<0.5). CONCLUSION: The ultrasonography to be more convenient and easier as a diagnostic method for the jumper's knee than MRI.

The relationship between knee laxity and general joint looseness in female basketball players / 体力科学

Injury of the anterior cruciate ligament (ACL) occurs frequently in female gymnasts and basketball players. However, there is no effective method for preventing ACL injury. Recently, a fatigue phenomenon of the ligament tissue has been considered to be the main causative factor in ACL injury.<BR>The present study was done to investigate the relationship between knee laxity and general joint looseness in 34 female college basketball players at an orthopedic medical check-up.<BR>Knee laxity was evaluated in terms of the anterior displacement (AD) value measured by a KT-2000 knee ligament arthrometer at 20 lb. General joint looseness was evaluated in terms of the general joint laxity (GL) score including six major joints and the spine.<BR>There was a significant correlation between the AD value and GL score, the correlation coefficients being 0.48 (p<0.01) at the right knee and 0.54 (p<0.01) at the left knee.<BR>The ACL of athletes with a higher AD would always be exposed to higher anterior stress than in athletes with a lower AD, thus possibly leading to a fatigue state. Therefore, we consider that athletes with a high AD are at greater risk of ACL injury. Our results suggest that the easy GL test is an effective screening method for differentiating those with a high AD and a greater risk of ACL injury.