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Postural Control in Quiet Stance in the Second League Male Volleyball Players

100%

Kuczyński M., Rektor Z., Borzucka D.

Human Movement

2009

vol. 10

issue 1

12-15

Purpose. The aim of the present work was to identify factors and neurophysiological mechanisms that may determine a robust and very stable postural control in athletes. Basic procedures. Postural performance in quiet stance was compared in 23 volleyball players from the Polish second league with 24 age-matched healthy physically active male subjects (controls). All participants stood quietly for 20 s on a force plate with their eyes open, while the center of pressure (COP) was recorded with the sampling rate of 20 Hz in both: the anterior-posterior (AP) and medial-lateral (ML) planes. From the recorded signals the COP dispersion measures, postural frequency and stiffness were computed. Main findings. The players displayed lower COP variability in the ML plane (p < 0.05) and lower COP range than controls in both planes (p < 0.01). Their COP mean velocity was higher in the AP plane (p < 0.0001) and the ML plane (p < 0.01) than in controls. Together, these findings indicated the presence of an additional low-amplitude and high-frequency signal superimposed on the COP in athletes but not in controls. Superior body stability and different mode of automatic postural control observed in the players challenge recent views on the relationships between attention resources allocation and its consequences to the selection and implementation of postural strategies. Conclusions. The volleyball players have superior body stability and different mode of automatic postural control as compared with the control group. Postural strategies of athletes may result from slight muscular adjustments that adopt mechanisms similar to stochastic resonance to monitor an instantaneous body vertical with greater efficiently.

The Effects of a Six-week Plyometric Training Program on the Stiffness of Anterior and Posterior Muscles of the Lower Leg in Male Volleyball Players

64%

Mroczek D., Superlak E., Seweryniak T., Maćkała K., Konefał M., Chmura P., Borzucka D., Rektor Z., Chmura J.

Central European Journal of Sport Sciences and Medicine

2017

vol. 20

issue 4

107-115

The study assesses the effects of a six-week plyometric training program (PT) on muscle stiffness in the dominant and non-dominant leg in male collegiate volleyball players. The study group comprised 16 volleyball players who had played collegiate volleyball for at least four years. For six consecutive weeks, twice a week, the players undertook a plyometric program of 60-min training sessions, each preceded with a specialist warm-up. The analysis of the anterior muscles of the right and the left lower leg revealed a significant increase in stiffness in the muscles of the right leg and the left leg. No significant differences were found between the anterior muscles of the left lower leg and the right lower leg in particular weeks of the training program. The analysis of the posterior lower leg muscles revealed no significant differences, either in the consecutive weekly training microcycles or between the left leg and the right leg. The measurement of muscle tone and biomechanical properties of muscles can be used as a fast and direct assessment of plyometric training-related muscle fatigue. A similar level of muscle stiffness in both lower legs (symmetry) is a reflection of the appropriate selection of plyometric training loads.

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1 Central European Journal of Sport Sciences and Medicine

1 Human Movement

1 2017

1 2009

2 Borzucka D.

2 Rektor Z.

1 Chmura J.

1 Chmura P.

1 Konefał M.

1 Kuczyński M.

1 Maćkała K.

1 Mroczek D.

1 Seweryniak T.

1 Superlak E.

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Postural Control in Quiet Stance in the Second League Male Volleyball Players

The Effects of a Six-week Plyometric Training Program on the Stiffness of Anterior and Posterior Muscles of the Lower Leg in Male Volleyball Players