Biorhythm is one of the latest topics in the field of identifying mind's ergonomics. Of all the performances with which biorhythm deals is the physical performance. The purpose of present research is to study the effect of physical cycle of biorhythm on the designated factors of physical fitness among teenage volleyball players in the city of Qom. In the present field research, 30 people were selected out of volleyball players aged 12 to 15 at random in the city of Qom. Biorhythm cycles were obtained with the biorhythm software. Vertical jump and medicine ball throwing were used as tests associating with muscular power; pull-up and sit-up were used as tests associating with muscular endurance in two states of charged (the second position) and discharged (the first position) of biorhythm physical cycle. The statistical correlated t test with the significance level of p≤0.05 was used to analyze data. The findings indicated that the tests pertaining to power including Vertical jump and medicine ball throwing were well-correlated with the physical cycle of biorhythm (p=0.042; p=0.019). However, the muscular endurance tests (revised sit-up and pull-up) did not show any significant difference between the two states and were not correlated with the physical cycle of biorhythm (p=0.75; p=0.73). The predictions by physical cycle of biorhythm on the muscular power of athletes are correct, but it was not possible with the muscular endurance of athletes. Of course, more researches should be conducted to increase the certainty of correctness predicted by the physical cycle of biorhythm. The prediction of this theory can be used to increase the performances of athletes in sports competitions if the biorhythm cycles prove right.
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Motor skills are always considered as one of the effective factors on human activities. The purpose of this research is to study the role of birth order and birth weight in the static and dynamic balance of boys aged 9-11 years old. 94 male students have been evaluated in this research. The personal information questionnaire and medical records were used to acquire data pertaining to birth order and birth weight. Also, parts of Lincoln-Oseretsky test pertaining to balance were used to evaluate static and dynamic balance. The results indicated that second children and children with normal weight had higher average scores rather than first children, only children, and children with low and high weight in most items of static and dynamic balance (p < 0.01). The superiority of second children over other children is probably because of the existence of older siblings which younger ones follow as models in families.
The present paper aimed to study the effect of using attentional instruction and increasing the rhythm on the relative phase stability of coordinated out-phase bimanual coordination movements. Using a plotter device, the participants (N=16) performed out-phase bimanual coordination pattern (45, 90, and 135 degree) while focusing on signs of the device (external attention) or their forearm (internal attention) or without attentional instruction with increasing frequency. KP was provided to participants after each attempt. Dependent variables were analyzed by 3 (attention) × 3 (relative phase) × 4 (frequency) analysis of variance with repeated measures on second and third variables. The results revealed that external attention lead to increased stability of relative phase in all three phase patterns. Additionally, increased frequency of motions caused decreased stability of relative in all three patterns. Findings of this study corroborated the constrained action hypothesis and showed that, unlike in-phase and anti-phase attractor patterns and because of the difficulty out-phase patterns, external attention instruction can act contrary to linear changes of control parameter and increase their stability of relative phases.
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