Table 1.
The anthropometric data of participants.
Fig 1.
Flowchart illustrating the different phases of the research and study selection.
PT: plyometric training, PTS: plyometric training with speed overload, PTW: plyometric training with weight overload, PTSW: plyometric training with speed and weight overload.
Table 2.
Plyometric training (PT) protocol for the four weeks in the four groups of the study.
Fig 2.
The method of applying speed overload.
Fig 3.
Schematic design of Sheppard repeat-effort test [83].
Table 3.
Means and standard deviations (Mean ± SD) of measured variables.
Fig 4.
Individual responses, means, and standard deviation of the functional tests results in the four groups.
PT: plyometric training, PTS: plyometric training with speed overload, PTW: plyometric training with weight overload, PTSW: plyometric training with speed and weight overload, SJH: Sarjent’s jump height, SPJH: Spike jump height, ShT: Sheppard test, s: Second, cm: Centimeter. *: significant difference compared to the pre-test. #: significant difference of D of groups compared to D of PT.
Table 4.
Comparison of the pre-test and post-test in each group.
Fig 5.
Individual responses, means, and standard deviation of the isometric and isokinetic parameters in the four groups.
PT: plyometric training, PTS: plyometric training with speed overload, PTW: plyometric training with weight overload, PTSW: plyometric training with speed and weight overload, ext: Extension, flx: Flexion, MVIC: Muscle voluntary isometric contraction, RFD: Average rate of force development, PTQ: Absolute peak torque, RPT: Relative peak torque, AP: Average power, s: Second, Nm: Newton meters.