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ESTIMATED ANTHROPOMETRIC INDICATORS OF RIGHT-HANDED
AND LEFT-HANDED CHILDREN IN THE SECOND PERIOD OF
CHILDHOOD
Rustamova N.B.
Bukhara State Medical Institute named after Abu Ali ibn Sino
https://doi.org/10.5281/zenodo.14265082
Abstract
The analysis was carried out on 10-year-old children of
secondary schools No. 7. The results of the study showed that 10-year-old left-
handed children lagged somewhat in physical development (div weight and
chest circumference) compared with righthanded children of the same age,
while the height and size of the left arm significantly increased.
Keywords:
anthropometric indicators, height, div weight, hemispheric
asymmetry, dynamometry
The relevance of the topic
Today, children's applause is relevant and
does not have the problem of a certain approach in the field of pedagogy and
physical education. Some researchers have developed methods of teaching
squirrels to the right, while others, on the contrary, have a positive attitude to
the phenomenon. No individual approach has been developed. In our opinion,
this problem requires one solution, since different forms of training and
retraining of the left hand can negatively affect their physical and mental
development. The question of a differentiated approach to learning (the teacher
takes into account the individual characteristics of a student or a group of
students in the learning process) is the basis of modern pedagogy [1].
The negative attitude towards the left hand has a long history and is
reflected in the events, actions and relationships associated with the right and
left hand in different cultures [2].
As a rule, in different cultures, positive qualities are associated with the
right side, negative ones with the left. Perhaps this is one of the manifestations
of the right-left attitude, as in different cultures. Many researchers note that
among left-handed children there are children who are able to perform motor
movements at a high level, but there are also certain difficulties in performing
clumsy and uncoordinated movements and developing skills [7,11].
This is probably due to a congenital left hand. The advantage of the left
hemisphere lies not only in the superiority of the left hand in performing motor
movements, but also in the distribution of various functions (motor, visual,
sensory, etc.) Between the right and left hemispheres as a kind of reflection of
interhemispheric asymmetry. [1,10].
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The achievement of dexterity is not only the predominance of the left hand
when performing motor actions, but as a certain reflection of interhemispheric
asymmetry means the distribution of various functions between the right and
left hemispheres. The theory of functional asymmetry of the cerebral
hemispheres has a long history of scientific thinking. The brains of right-handed
and left-handed people were first studied in 1871 by the English anatomist Ogle.
He discovered that the brain of a normal person is mirror-symmetrical to the
brain of a normal person. A study conducted in the UK in the 1970s showed that
approximately 11% of men and women aged 15-24 years suffer from this
disease, compared with only 3% in the 55- 64 age group [17].
There is still no clear understanding of the nature of left-handers. The
version that most people use is that the choice of right or left hand depends on
two genes (one gene determines which hemisphere controls speech, the other
determines which hand controls the "speech" hemisphere). The role of heredity
also lies in the fact that the probability of having a child with a cleft palate is no
more than 2%, but if one of the parents has a cleft, then it increases to 17%, and
if both have a cleft, then the probability increases to 46%.
In a study conducted by the BBC news agency by Swedish scientists,
pregnant women who underwent ultrasound examination in the late stages of
pregnancy were 32% more likely to give birth to a small baby.
There is evidence that left-handers and right-handers are emotionally
different. Lefthanders have great creative, especially artistic abilities and more
emotions than righthanders. Many historical figures and geniuses were left-
handed. Among them are artists Pablo Picasso, Michelangelo Buonarotti,
Leonardo da Vinci, rulers and generals Charles, Napoleon Bonaparte, Alexander
2%
17%
46%
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
50%
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the Great, Julius Caesar, writers Lewis Carroll and Nikolai Leskov, scientists
James Maxwell, Ivan Pavlov, musician Henri Paul Poyn.
It turns out that there is even a World Day of Lefties, which has been
celebrated annually since 1992 on August 13! The Day of lefties is designed to
draw attention to: the problem of retraining left-handed children (teachers or
parents) to write with their right hand in society leads only to psychological
trauma; then manufacturers and designers of household goods will need to
make products taking into account the convenience of children. We often
encounter similar views on the left hand and such relationships. Perhaps the
decisive factor is negligence, misunderstanding of the biological mechanisms of
flattery, and most importantly, the inability of children to accept a variety of
individual differences, their abilities, inclinations, differences in reactions, under
the influence of the same factors, these individual characteristics [2].
The number of left-handers in the world has a positive trend: if in 1928
3.3% of lefthanders and 4.7% of left-handed men were identified, then in 1973 -
8.8% of lefthanders and 10.4% of left-handers. Left-handed men, 1978-1988
Over the years, the number of left-handers has increased by 12.4%, and left-
handed men - by 13.9%.The increase in the number of students in Ishim schools
in 1998 5.2%, in 1999 - 6.1%, in 2000 - 5.5%, in 2001 - 7.5%, in 2002 - 7.9%, in
2003 - 8.3%, in 2004 - 8.6% [12]
The decrease in intellectual abilities of proteins may have a single cause -
it is a developmental pathology, but healthy proteins can also have remarkable
abilities, there are plenty of such data [2].
Lefties have the features of visual perception of information. It was found
that the well-being of the visual system is especially characteristic of left-handed
children [11,18].
On the contrary, cases such as asthenic neurosis are more common in
children of primary school age. This is accompanied by a decrease in working
capacity and activity, increased fatigue, rapid fatigue. The peak of activity is
observed only in the first two lessons, after which children experience a
decrease in endurance and motor movements. In the following hours, children
feel tired, sluggish and lose interest in new information [1,5].
It is recommended to start teaching children at school, as well as problems
with disorders such as coordination of movements, including insufficiency of
fine motor skills of the leading hand and perception of div shapes through the
program, the whole system discusses exercises on correctional work has
significant opportunities in practice [6,11,16].
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An analysis of the available literature showed that anthropometric
parameters in one or another part of the div were not studied individually and
to a certain extent in the children's complex "levsha". There is no data on
morphometric parameters of div parts of left-handed children depending on
age and sexual demorphism. All this requires a deep study of the problem and
analysis of the data obtained in the future.
The purpose of the study:
To study the comparative characteristics of
morphometric indicators in children and adolescents aged 10 years.
Research material:
Conducted on the basis of bilateral agreements of the
Bukhara State Medical Institute in secondary school No. 7 of Bukhara (No. 517
dated 02.05.2020). The children were divided into 2 groups (n = 40): I - group of
10-year-old left-handed children (n = 20); II- The results of the survey of the
group of 10-year-old right-handed children (n = 20) were studied.To carry out
anthropometric measurements, the method of anthropometric research of
children was used (morphometric features of assessing the physical
development of children and adolescents - methodological recommendations //
Shomirzaev N.H., Ten S.A., Tukhtanazarova I., 1998). Anthropometric studies
included measurements of height, div weight, arm length, chest circumference
and muscle strength. Mathematical processing was carried out directly from the
general Excel 7.0 data matrix using the capabilities of STTGRAPH 5.1, indicators
of standard deviation and presentation errors were identified.
Research results and discussion
Studies have shown that 10-year-old
left-handers had a height from 126.4 to 150.2 cm, on average 134.6 ± 1152 cm,
and right-handers of the same age - from 126.1 to 142.3 cm, on average 134.4 ±
0.768 cm. The div weight of the left-handed woman ranged from 22.3 kg to
36.5 kg, on average 29.05 ± 0.696 kg, and in the right-handed woman of the
same age - from 23.5 kg to 44.5 kg, on average 30.3 ± 1.008 kg. The length of the
left arm ranged from 53.2 cm to 63.4 cm on average in 10-year-old left-handers,
57.5 ± 0.48 cm on average and from 52.0 to 61.3 cm in right-handers, on average
55.6 ± 0.432 cm. The chest circumference in left-handers averaged 63.05 = 0.504
cm, in right-handers - on average 65.7 = 1.032 cm (Table No. 1). Muscle strength
in left-handers averaged 12.9 = 0.3 kg, while in right-handers it averaged 10.75 =
0.3 kg (Table No.1)
Physical activity of 10-year-old children in the study development
indicators № Indicators 10 year old children (n= 40) Lefties (n = 20) right-
handed (n = 20) 1 Height, cm 134,6± 1,152* 134,4 ± 0,768 2 Body weight, kg
29,05 ± 0,696 30,3 ± 1,008 3 Left arm length, cm 57,5± 0,48 55,6 ± 0,432 4 Chest
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circumference, cm 63,05 ± 0,504* 65,7± 1,032 5 Muscle strength, kg 12,9±0,3*
10,75±0,3 Note: * - reliability level p ≤ 0.05 compared to the previous group
Anthropometric studies among left-handed and right-handed children showed
that the right-handed man was 0.20 cm lower than the left-handed man of the
same age, and that the right-handed man's div weight was 1.25 kg higher than
that of the lefthanded man of the same age. In 10-year-old left-handed people,
the length of the left arm was 1.90 cm longer than in right-handed people. The
size of the thoracic circumference turned out to be 2.65 cm wider than in left-
handed women of the same age. The muscle strength of lefthanders turned out
to be 2.15 kg stronger than that of right-handers of the same age.
Conclusions:
According to the data obtained, 10-year-old children lagged
slightly in physical development (div weight and chest circumference)
compared with children of the same age, on the contrary, there was a significant
increase in height and length of the left arm.
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