Page 130 - Petelin Ana. Ur. 2022. Zdravje otrok in mladostnikov / Health of children and adolescents. Proceedings. Koper: Založba Univerze na Primorskem/University of Primorska Press
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avje otrok in mladostnikov | health of children and adolescents 130 Like the previous variable, result change in maximal inspiratory flow was
statistically significant and increased in intervention and control group. Based
on the obtained results, we cannot claim that the improvement is due to in-
tervention. We can conclude that maximal flow of inhaled air per second in-
creased because of better IM strength, which enable faster and stronger inha-
lation. Romer and McConnell (2003) claim the exact thing, therefore the peak
inspiratory velocity is proportional to inspiratory strength and increases with
training and reduction in fatigue response.

The results of the TTCO₂ showed statistically significant effect of time
but not time and group. The improvement of the result was shown in the inter-
vention and control group. Although the improvement of carrying the CO₂ in
the system was greater in intervention group, we cannot certainly say that this
is the result of the intervention. Improving CO₂ tolerance means less general-
ized anxiety perception, lower cortisol levels and thus better physical and men-
tal performance (Crux fitness, 2020).

In Buteyko control pause test the effect of both time, and time and group
was statistically significant and the results improved in both groups. Although
the improvement in control group was not significant, was greater, therefore
we assume that the intervention had a negative effect on this variable. The in-
tervention included just IM, and it seems that expiratory muscle inactivity af-
fected the worse exhalation control. The “assymetry” in strength and stiffness
could somewhat affect the performance. Even with Buteyko`s test there is a
possibility of experience influencing the second measurements. Subconscious-
ly, a person may exhale less air knowing, that he will have to hold his breathe
as long as possible.

As already mentioned, in some articles we found a connection between
inspiratory function improvement and certain swimming skills. We were
mainly interested in maintaining or as little decrease of swimming abilities as
possible.

The analysis showed statistically significant effect of time in the swim
time 50-100m and 0-100m test. We observe an increase of time in both groups
in both tests. As the time decreased less in intervention group in both tests, we
observe a trend of smaller decline in swimming skills after intervention, and
conclude that IMT had an impact on maintaining swimming skills.

Considering that S-index and PIF increased in both groups and the swim-
ming result decreased while the effect of time and group was not statistical-
ly significant, we cannot confirm the connection between S-index and swim-
ming time. We assume that the intervention influenced on easier overcoming
of hydrostatic pressure during swimming, since there is no difference between
the groups outside the water. The difference was noticeable only in the water.
We did not find any research studying the effect of IMT without simultaneous
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