ISSN: 1899-1955
Human Movement
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SCImago Journal & Country Rank
 
3/2017
vol. 18
 
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abstract:
Original paper

Maturation-related differences in neuromuscular fatigue after a short-term maximal run

Sami Äyrämö
,
Nikke Vilmi
,
Antti Antero Mero
,
Jarmo Piirainen
,
Ari Nummela
,
Teemu Pullinen
,
Janne Avela
,
Vesa Linnamo

Online publish date: 2018/02/26
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Purpose
This study investigated maturation-related differences in neuromuscular fatigue after a short-term maximal run.

Methods
Eight male children, eight adolescents, and eight adults performed a maximal ca. 50-s run (300/350/400 m, respectively). Mechanisms of neuromuscular fatigue were assessed through isometric plantar flexor tests, electrical stimulation of the posterior tibial nerve, soleus electromyography, and blood tests.

Results
All the groups showed a decrease in the running speed (children: –12.2 ± 6.5%; adolescents: –9.8 ± 5.1%; adults: –12.2 ± 3.1%), but only adults revealed a decline in the maximal isometric plantar flexor torque (–16.1 ± 13.0%). On the other hand, the relative pre- to post-fatigue change in the maximal isometric plantar flexor torque differed only between adults and adolescents. The peak torque in the passive twitch test decreased in adolescents (–19.2 ± 12.2%) and adults (–23.7 ± 13.7%). Moreover, post-fatigue minimum blood pH (children: 7.18 ± 0.03; adolescents: 7.14 ± 0.07; adults: 6.97 ± 0.06) differed between the groups. No changes were observed in the neural drive or mechanisms at the spinal level.

Conclusions
Despite the loss of running speed, children showed no post-exercise fatigue, whereas adolescents and adults demon­strated fatigue at peripheral sites. Central fatigue could not be established for the studied groups.

keywords:

children, maturation, neuromuscular fatigue, high-intensity exercise

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