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論文審査委員三浦 健
博士（体育学）第１０号
学位規則第４条第１項該当
平成２１年３月２４日
Determinants of the abilities to jump higher and shorten
the contact time in a running one-legged vertical jumpin basketball
主査 山本 正嘉副査 図子 浩二
副査 前田 明論 文 概 要In basketball, improving jumping abilities markedly enhances individualcompetitive performance. When shooting, depending on defender actions, a shooter
must decide whether to jump with one or two legs. These jumping abilities involve
jumping height and contact time. In competition, if an offensive player can jump highand quickly, then a player is more likely to disrupt the timing of defenders, draw afoul, and shoot the ball. When comparing running one-legged and two-legged vertical
jumps, there is no marked difference in jumping height, but a running one-legged
vertical jump has a shorter contact time. In studies on the running one-legged
vertical jump, there have been reports on the high jump and long jump in track andfield, but because people compete for height and distance in these athletic events,
there have not been many studies that analyzed contact time as one of the factors
determining jumping performance.
The running one-legged vertical jump in basketball requires comprehensive
abilities to efficiently carry out ballistic and stretch-shortening cycle movements.
With the drop jump, in which a person jumps off of a stand, lands, and then
immediately jumps, and the repeated rebound jump, in which a person successively
and quickly jumps vertically, these basic jump indexes that were calculated based oncontact time and jumping height (jumping height / contact time) have been used toassess ballistic stretch-shortening cycle movements. Many studies on basketball
players have analyzed jumping techniques, but there have only been a few studies
that measured jumping index.
In the present study, the above-mentioned assessment method was applied toassess the abilities to jump higher and shorten the contact time of the running
one-legged vertical jump in an attempt to ascertain determination factors andefficacy.
This study was conducted to obtain useful information for developing training
techniques of running one-legged vertical jump in basketball (lay-up shot jump). The
ability of the lay-up shot jump and various basic jumps were measured by testing 19

male basketball players. The basic jumps consisted of one-legged repeated reboundjump, two-legged repeated rebound jump, and countermovement jump. Jumping
height, contact time, and jumping index (jumping height / contact time) weremeasured and calculated by a contact mat / computer system that recorded thecontact and air times. The jumping index means power. The lay-up shot jump was thehighest index jumping technique among the different jumps. No significant
correlation existed between jumping height and contact time of lay-up shot jump, thetwo components of lay-up shot jump index. As a result, jumping height and contact
time were found to be mutually independent abilities. Relationship of contact time
between lay-up shot jump to one-legged repeated rebound jump and two-legged
repeated rebound jump correlated on the same significant levels (p<0.05). A
significant correlation for jumping height existed between one-legged repeated
rebound jump and lay-up shot jump (p<0.05), although none existed for jumping
height between lay-up shot jump and both two-legged repeated rebound jump andcountermovement jump. The lay-up shot index correlated more strongly to one-legged
repeated rebound jump index (p<0.01) when compared to two-legged repeated
rebound jump index (p<0.05). These results suggest that one-legged repeated reboundjump is effective in improving both contact time and jumping height in lay-up shot
jump.
These findings are useful for evaluating ability to perform running one-legged
vertical jumps in basketball and examining training techniques to improve ability toperform running one-legged vertical jumps in basketball.

論文

審

査の要旨

本論文は、バスケットボールにおける助走付き片脚踏切ジャンプ(Lay up shoot jump,LSJ)の能力を測定評価する方法を新しく開発したものである。また、新しい測定法から得られる指標と、これまでの跳躍力テストによる指標との関係を検討することによって、測定データの評価診断法についても言及している。具体的には、接続式マットスイッチを２枚組み合わせて用いると、前方への移動を伴った LSJ の接地時間と跳躍高を精度よく簡単に計測できるとともに、この２要因からパワー指数も算出できることを示している。また 、これらの２要因の間には相関関係が見られないことから、LSJ 遂行時において，運動遂 行時間を短縮する要因と、高い跳躍高を獲得する要因とは、互いに独立した関係にあることを示唆している。さらに、パワー指数とこれを形成する２要因に対する、その場での両脚リバウンドジャンプ能力や、片脚リバウンドジャンプ能力との構造的な関連性についても明らかにしている。LSJ を最上位に位置づけ、各種ジャンプ力との関係性を示した構造モデルの提示は、助走付き片脚踏切ジャンプ力のトレーニングを考える際に役立つ指針となるものである。これらの知見は、バスケットボールによる競技力向上のために役立つとともに、体育科学が取り組むべき重要な課題の一つを解決した研究である。