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Influence of an acute exposure to a moderate real altitude on motoneuron pool excitability and jumping performance
ID
Štirn, Igor
(
Author
),
ID
García Ramos, Amador
(
Author
),
ID
Feriche, Belén
(
Author
),
ID
Strojnik, Vojko
(
Author
),
ID
Tomažin, Katja
(
Author
)
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https://www.frontiersin.org/articles/10.3389/fphys.2022.861927/full
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Abstract
The aim of the study was to test whether ascending to a moderate real altitude affects motoneuron pool excitability at rest, as expressed by a change in the H-reflex amplitude, and also to elucidate whether a possible alteration in the motoneuron pool excitability could be reflected in the execution of lower-body concentric explosive (squat jump; SJ) and fast eccentric-concentric (drop jump; DJ) muscle actions. Fifteen participants performed four experimental sessions that consisted of the combination of two real altitude conditions [low altitude (low altitude, 690 m), high altitude (higher altitude, 2,320 m)] and two testing procedures (H-reflex and vertical jumps). Participants were tested on each testing day at 8, 11, 14 and 17 h. The only significant difference (p < 0.05) detected for the H-reflex was the higher H-reflex response (25.6%) obtained 15 min after arrival at altitude compared to baseline measurement. In terms of motor behavior, DJ height was the only variable that showed a significant interaction between altitude conditions (LA and HA) and time of measurement (8, 11, 14 and 17 h) as DJ height increased more during successive measurements at HA compared to LA. The only significant difference between the LA and HA conditions was observed for DJ height at 17 h which was higher for the HA condition (p = 0.04, ES = 0.41). Although an increased H-reflex response was detected after a brief (15–20 min) exposure to real altitude, the effect on motoneuron pool excitability could not be confirmed since no significant changes in the H-reflex were detected when comparing LA and HA. On the other hand, the positive effect of altitude on DJ performance was accentuated after 6 h of exposure.
Language:
English
Keywords:
sport
,
drop jump
,
H-reflex
,
hypoxia
,
squat jump
,
altitude
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FŠ - Faculty of Sport
Publication status:
Published
Publication version:
Version of Record
Year:
2022
Number of pages:
8 str.
Numbering:
Vol. 13, art. 861927
PID:
20.500.12556/RUL-145333
UDC:
796.01
ISSN on article:
1664-042X
DOI:
10.3389/fphys.2022.861927
COBISS.SI-ID:
106146563
Publication date in RUL:
18.04.2023
Views:
834
Downloads:
63
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Record is a part of a journal
Title:
Frontiers in physiology
Shortened title:
Front. physiol.
Publisher:
Frontiers Media
ISSN:
1664-042X
COBISS.SI-ID:
1218939
Licences
License:
CC BY 4.0, Creative Commons Attribution 4.0 International
Link:
http://creativecommons.org/licenses/by/4.0/
Description:
This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Secondary language
Language:
Slovenian
Keywords:
šport
,
skok s padcem
,
H-refleks
,
hipoksija
,
skok iz počepa
,
višina
Projects
Funder:
ARRS - Slovenian Research Agency
Project number:
P5-0142
Name:
Bio-psiho-socialni konteksti kineziologije
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