The findings of this study showed that 4 weeks of 4-session per week plyometric training caused an increase in
EMG changes in the biceps femoris for the squat movement (absolute strength). The nature and type of plyometric
exercises add much force and tension to muscle cords. Performing such activities or tolerating extreme force and
tension may lead to needed physiological or biological changes in muscle cords and other parts of the contraction
system and can also cause muscle EMG changes to rise. Hence, at higher levels, when an athlete is trying to reach
maximum strength, it is probable that plyometric training will not be as influential as weight training. The findings
of Olson (2010) and Chimera (2004) verify these results, whereas those of Herrero (2006) and Arabatzi at al. (2010)
state otherwise.
Statistical analysis of the findings of this study showed that 4 weeks of plyometric training in 4 weekly sessions
caused no significant increase in the muscle EMG of the biceps femoris when performing the vertical jump
(explosive power). The cause can be noted as insufficient training specific to the muscle or the insufficiency in the
severity of training. These findings are similar to those of Herrero (2006), opposing Potach et al. (2007).
This study emphasized that 4 weekly plyometric training sessions in a 4 week period had a significant effect on
the EMG changes of the gracilis when the subjects performed the squat movement (absolute strength). Myer et al.
(2006), Pollock (2010), Kato (2010) and Kubo (2007) also found changes in EMG and the strength of other muscles.
Henry et al. (2010) and Herrero (2006) reached other conclusions. Some of the reasons for such a variety of results
may be noted as the difference in participants, type of exercises applied, the time of training and the difference in the
muscles studied. This study also emphasized that 4 weeks of plyometric training effected gracilis EMG while
performing the vertical jump (explosive power). The reasons for such an effect can be stated as the severity of
plyometric training and its effect on the muscles contraction elements and the muscles physiological changes. Ball
and Scurr (2009) and Potach (2007), too, found the vertical jump influential.
This study shows that a 4-week plyometric training period can create improvement in muscle strength in some
lower-body muscles of futsal players. These types of exercises can be used for preparation seasons, as well as
competition seasons to increase lower-body muscle strength in futsal players.
Acknowledgments
The findings of this study showed that 4 weeks of 4-session per week plyometric training caused an increase in
EMG changes in the biceps femoris for the squat movement (absolute strength). The nature and type of plyometric
exercises add much force and tension to muscle cords. Performing such activities or tolerating extreme force and
tension may lead to needed physiological or biological changes in muscle cords and other parts of the contraction
system and can also cause muscle EMG changes to rise. Hence, at higher levels, when an athlete is trying to reach
maximum strength, it is probable that plyometric training will not be as influential as weight training. The findings
of Olson (2010) and Chimera (2004) verify these results, whereas those of Herrero (2006) and Arabatzi at al. (2010)
state otherwise.
Statistical analysis of the findings of this study showed that 4 weeks of plyometric training in 4 weekly sessions
caused no significant increase in the muscle EMG of the biceps femoris when performing the vertical jump
(explosive power). The cause can be noted as insufficient training specific to the muscle or the insufficiency in the
severity of training. These findings are similar to those of Herrero (2006), opposing Potach et al. (2007).
This study emphasized that 4 weekly plyometric training sessions in a 4 week period had a significant effect on
the EMG changes of the gracilis when the subjects performed the squat movement (absolute strength). Myer et al.
(2006), Pollock (2010), Kato (2010) and Kubo (2007) also found changes in EMG and the strength of other muscles.
Henry et al. (2010) and Herrero (2006) reached other conclusions. Some of the reasons for such a variety of results
may be noted as the difference in participants, type of exercises applied, the time of training and the difference in the
muscles studied. This study also emphasized that 4 weeks of plyometric training effected gracilis EMG while
performing the vertical jump (explosive power). The reasons for such an effect can be stated as the severity of
plyometric training and its effect on the muscles contraction elements and the muscles physiological changes. Ball
and Scurr (2009) and Potach (2007), too, found the vertical jump influential.
This study shows that a 4-week plyometric training period can create improvement in muscle strength in some
lower-body muscles of futsal players. These types of exercises can be used for preparation seasons, as well as
competition seasons to increase lower-body muscle strength in futsal players.
Acknowledgments
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