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The influence of plyometrics training on the maximal power of the lower limbs in basketball players aged 16–18
Table 9. Descriptive statistics and significance level of the differences for 5m run [s]
Test Run N x ± S min – max S k K u T p
I 1 188 1,34 ± 0,07 1,18 – 1,48 –0,404 0,572
II 1 18 1,27 ± 0,04 1,20 – 1,35 0,112 0,014
I 2 18 1,35 ± 0,10 1,17 – 1,55 –0,029 –0,411
II 2 18 1,30 ± 0,05 1,21 – 1,38 –0,295 –0,296
I 3 18 1,35 ± 0,09 1,16 – 1,51 –0,282 –0,523
II 3 18 1,30 ± 0,05 1,24 – 1,40 1,142 0,331
I 4 18 1,37 ± 0,08 1,24 – 1,49 0,113 –1,456
II 4 18 1,30 ± 0,05 1,22 – 1,40 –0,019 –0,482
I 5 18 1,38 ± 0,10 1,19 – 1,58 –0,245 –0,371
II 5 18 1,33 ± 0,04 1,23 – 1,39 –0,927 0,835
I 6 18 1,39 ± 0,07 1,29 – 1,58 1,091 1,507
II 6 18 1,31 ± 0,07 1,15 – 1,38 –1,389 2,091
I 7 18 1,39 ± 0,07 1,25 – 1,57 0,428 0,988
II 7 18 1,31 ± 0,04 1,27 – 1,39 1,318 0,924
I 8 18 1,41 ± 0,08 1,28 – 1,63 0,732 1,628
II 8 18 1,32 ± 0,02 1,30 – 1,36 0,360 –1,474
I 9 18 1,42 ± 0,08 1,23 – 1,55 –0,698 1,047
II 9 18 1,32 ± 0,05 1,26 – 1,41 0,421 –0,507
I 10 18 1,42 ± 0,08 1,32 – 1,60 0,772 –0,081
II 10 18 1,31 ± 0,06 1,25 – 1,42 1,066 0,014
Cossor et al. [22] described the effect of 20 weeks
of plyometric training. During the study subjects (12–16
year old swimmers) performed a total of 2700 jumps.
After the experiment there were no signifi cant changes
in the values of explosive leg strength in the young
swimmers. The authors suggest two most probable reasons
for such a situation: fi rst, physical load imposed by
the plyometric training turned out to be too low, as the
authors used load recommended for training children.
Out of the two components of training load, the body
of a young athlete better tolerates volume better than
intensity. The second reason is the young swimmers’
growth process.
Authors [12, 15, 18–21, 37] of some research papers
have not observed any signifi cant increase of
sport achievements after applying the plyometric train-
– 41 –
11,5 0,055
31,5 0,893
25,0 0,798
11,5 0,055
27,0 0,593
11,5 0,055
2,0 0,005
12,5 0,068
6,5 0,018
5,0 0,021
ing, which was most probably due to a too short plyometric
program. Burr and Young [20] believe that the
plyometric training should be carried out for at least 18
weeks for the positive effects to appear. High intensity
exercises which affect the nervous system should only
be applied in individuals where the growth process is
completed. Particular plyometric exercises should be
performed with maximum strength (when the subject
is not fatigued), and rest periods should take at least as
much time as the exercises.
The conclusions concerning the application of
plyometric exercises in a training process can be now
formed. Basketball training should be supported by plyometric
training, and its intensity, one of the components
of load, should exceed average values appropriate to
the subject’s age. Increasing the training volume and