Purpose: The difference in the force distribution of plantar muscles in the landing 
stage in volleyball players is an important cause of lower limb injuries in the lack 
of balance control. The aim of this study was to compare the distribution of plantar 
pressure on the dynamic balance of infants, teenagers and young volleyball players 
in the stance phase of walking.
Materials and Methods: The current research was descriptive-cross-sectional. For 
this purpose, 64 healthy male volleyball players in 3 age groups were targeted in 
three groups; Infants (n=22), teenagers (n=24) and young people (n=18) were 
divided. The minimum amount of training per week was 3 days. A foot pressure 
device was used to determine the pressure distribution of the plantar muscles on the 
way back and forth. In order to compare between groups the level of foot contact 
and impulse in three parts of the front, middle, back of the right and left foot and 
the axis angle of the feet, correlated t-test and multivariate analysis of variance were 
used at the alpha level of 0.05.
Findings: The contact surface of the sole of the right foot in the middle part 
compared to the left foot in the group of infants increased significantly compared 
to the other two groups (P=0.038). But in other sections and groups, there was no 
significant difference in the right and left leg (P=0.051). The results of multivariate 
analysis of variance for the comparison of the contact surface (forefoot, midfoot, 
rearfoot) in the right foot between the three groups of infants, teenagers and young 
people showed a significant difference (P=0.023). Impulse in the front (P=0.030) 
and middle parts of the right leg (P=0.015) increased significantly compared to the 
left leg in the group of infants. But in the back part of the sole of the right foot 
(P=0.411). There was no significant difference between the three groups in the three 
sections mentioned in the left leg (P=0.050). There was no significant difference in 
the rotation axis angle of the plantar force between the right and left foot in any of 
the groups (P=0.050).
Conclusion: According to the possible results, the increase in the contact surface 
and impulse in the front, middle and sole of the right foot compared to the left foot 
and at the moment of landing and the settling phase in non-hall players is more than 
that of teenagers and young volleyball players, which is an effective factor in 
weakening balance control. dynamic and causing damage.