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2013 | 37 | 1 | 91-98
Tytuł artykułu

Neuromuscular Impairment Following Backpack Load Carriage

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Load Carriage using backpacks is an occupational task and can be a recreational pursuit. The aim of this study was to investigate the mechanisms responsible for changes in neuromuscular function of the m. quadriceps femoris following load carriage. The physiological responses of 10 male participants to voluntary and electrically stimulated isometric contractions were measured before and immediately after two hours of treadmill walking at 6.5 km•h-1 during level walking with no load [LW], and level walking with load carriage (25 kg backpack) [LC]. Maximal voluntary contraction force decreased by 15 ± 11 % following LC (p=0.006), with no change following LW (p=0.292). Voluntary activation decreased after LW and LC (p=0.033) with no difference between conditions (p=0.405). Doublet contraction time decreased after both LW and LC (p=0.002), with no difference between conditions (p=0.232). There were no other changes in electrically invoked doublet parameters in either condition. The 20:50 Hz ratio did not change following LW (p=0.864) but decreased from 0.88 ± 0.04 to 0.84 ± 0.04 after LC (p=0.011) indicating reduced Ca2+ release from the sarcoplasmic reticulum during excitation contraction coupling. In conclusion, two hours of load carriage carrying a 25 kg back pack caused neuromuscular impairment through a decrease in voluntary activation (i.e. central drive) and fatigue or damage to the peripheral muscle, including impairment of the excitation contraction coupling process. This may reduce physical performance and increase the risk of musculoskeletal injury.
Wydawca

Rocznik
Tom
37
Numer
1
Strony
91-98
Opis fizyczny
Daty
wydano
2013-06-01
online
2013-07-05
Twórcy
  • University of Chichester, Department of Sport and Exercise Sciences, West Sussex, PO19 6PE, UK, Phone +44 (0) 1243 793473, Fax +44 (0)1243 816080, s.blacker@chi.ac.uk
  • Institute of Naval Medicine, Alverstoke, Hampshire, UK
  • University of Bath, Department for Health, Bath, UK
  • University of Chichester, Department of Sport and Exercise Sciences, West Sussex, UK
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_hukin-2013-0029
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