Lack of Evidence for Crossover Fatigue with Plantar Flexor Muscles.

Autor: Hadjizadeh Anvar S; School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's Newfoundland and Labrador (NL), Canada.; Faculty of Physical Education & Sport Sciences, University of Tehran, Tehran, Iran., Kordi MR; Faculty of Physical Education & Sport Sciences, University of Tehran, Tehran, Iran., Alizadeh S; School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's Newfoundland and Labrador (NL), Canada., Ramsay E; School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's Newfoundland and Labrador (NL), Canada., Shabkhiz F; Faculty of Physical Education & Sport Sciences, University of Tehran, Tehran, Iran., Behm DG; School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's Newfoundland and Labrador (NL), Canada.
Jazyk: angličtina
Zdroj: Journal of sports science & medicine [J Sports Sci Med] 2022 Jun 01; Vol. 21 (2), pp. 214-223. Date of Electronic Publication: 2022 Jun 01 (Print Publication: 2022).
DOI: 10.52082/jssm.2022.214
Abstrakt: The occurrence and mechanisms underlying non-local or crossover muscle fatigue is an ongoing issue. This study aimed to investigate crossover fatigue of the plantar flexor muscles. Sixteen recreationally active males (n = 6) and females (n = 10) visited the laboratory for four sessions and performed a single 5-s pre-test maximal voluntary isometric contraction (MVIC) with each plantar flexors muscle. Thereafter, the fatigue intervention involved two 100-s MVICs (60-s recovery) with their dominant plantar flexors or rested for 260-s (control). Subsequently, in two separate sessions, Hoffman reflexes (H-reflex) were evoked in the non-dominant, non-exercised, leg before and following the dominant leg fatigue or control intervention (Fatigue-Reflex and Control-Reflex conditions). MVIC forces and volitional (V)-waves were monitored in the non-dominant leg in the other two sessions (Fatigue-MVIC and Control-MVIC) before and after the intervention (fatigue or control) as well as during 12 repeated MVICs and immediately thereafter. Despite the force reduction in the dominant leg (42.4%, p = 0.002), no crossover force deficit with single (F (1,9) = 0.02, p = 0.88, pƞ 2 = 0.003) or repeated (F (1,9) = 0.006, p = 0.93, pƞ 2 = 0.001 ) MVIC testing were observed. The H-reflex did not change after the fatigue (F (1,7) = 0.51; p = 0.49; pƞ 2 = 0.06) or repeated MVICs (F (1,8) = 0.27; p = 0.61; pƞ 2 = 0.03). There were also no crossover effects of fatigue on the V-wave with single (F (1,8) = 3.71, p = 0.09, pƞ 2 = 0.31 ) or repeated MVICs (F (1,6) = 1.45, p = 0.27, pƞ 2 = 0.19 ). Crossover fatigue was not evident with the plantar flexors nor any significant changes in H-reflex and V-waves in the soleus muscle. This finding suggests that crossover fatigue may not necessarily occur in slow-twitch predominant muscle groups.
(© Journal of Sports Science and Medicine.)
Databáze: MEDLINE
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