The Effect of Exhausting Exercise Induced Muscular Fatigue On Functional Stability

Letafatkar, Amir; Alizadeh, Mohammad Hossein; Kordi, Mohammad Reza

doi:10.3844/jssp.2009.416.422

Cited by 11 publications

(19 citation statements)

References 47 publications

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“…Input received from pain receptors can lead to changes in vertical spatial perception ability (1). Fatigue can also affect the discharge of a lot of sensory receptors such as muscle spindles (10).…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, muscle spindle discharge may be influenced directly by fatigue (2). Muscle spindle discharge may be also affected by changes related to changes in the alpha motor neurons discharge (1). Such unnatural flows of muscle spindles cna cause impaired postural control.…”

Section: Discussionmentioning

confidence: 99%

“…The person could move his feet at this poit if needed and placed those in good condition to keep the balance. There was focuse on the distance between two feet not exceeding shoulder width at this point (1). After this step, the status of foot of the person was recorded and was maintained until the end of the test.…”

Section: Methodsmentioning

confidence: 99%

“…Hence, it should be said that muscle fatigue may occur as a result of any failure in muscle contraction (3). Fatigue depends on the type of exercise (1), the type of contraction, intensity and duration of exercise (2). Potential factors that contribute to fatigue include: central factors (which cause fatigue by disrupting neuromuscular transmission between central nervous system and muscle membranes) and environmental factors (Which cause changes within the muscle) (3).…”

mentioning

confidence: 99%

“…These receptors are concentrated especially in deep sub-occipital muscles and are considered as a key point in central and reflex communication (1). For example, change of neck joint proprioception, balance disturbances, change of eye movements' control, change of postural activity of neck and change of posture control have been seen (3).…”

mentioning

confidence: 99%

See 4 more Smart Citations

The effects of neck muscular fatigue on static and dynamic postural control in elite male volleyball players

Mazidi

Letafatkar

Hadadnejad

et al. 2017

hmj

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show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

The effects of neck muscular fatigue on static and dynamic postural control in elite male volleyball players

Mazidi

Letafatkar

Hadadnejad

et al. 2017

hmj

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show abstract

Neck muscle fatigue alters upper limb proprioception

2015

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Limb proprioception is an awareness by the central nervous system (CNS) of the location of a limb in three-dimensional space and is essential for movement and postural control. The CNS uses the position of the head and neck when interpreting the position of the upper limb, and altered input from neck muscles may affect the sensory inputs to the CNS and consequently may impair the awareness of upper limb joint position. The purpose of this study was to determine whether fatigue of the cervical extensors muscles (CEM) using a submaximal fatigue protocol alters the ability to recreate a previously presented elbow angle with the head in a neutral position. Twelve healthy individuals participated. CEM activity was examined bilaterally using surface electromyography, and kinematics of the elbow joint was measured. The fatigue protocol included an isometric neck extension task at 70 % of maximum until failure. Joint position error increased following fatigue, demonstrating a significant main effect of time (F 2, 18 = 19.41, p ≤ 0.0001) for absolute error. No significant differences were found for variable error (F 2, 18 = 0.27, p = 0.76) or constant error (F 2, 18 = 1.16 of time, p ≤ 0.33). This study confirms that fatigue of the CEM can reduce the accuracy of elbow joint position matching. This suggests that altered afferent input from the neck subsequent to fatigue may impair upper limb proprioception.

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Balance and Fatigue in Wrestlers

Letafatkar

Shojaeddin

Amirsasan

et al. 2012

International Journal of Wrestling Science

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Purpose: The purpose of this study was to show that: being "in context" and "similarity" in fatiguing protocols to the main aspects of sport does not alter wrestlers balance. Methods: Twenty professional male wrestlers (age 26.2±1 yr, VO 2 max 62.3±3.1 ml kg min) participated in this study (10 in experimental and 10 subjects in control group) and completed a fatigue protocol. In this study, a regular wrestling match was used for the metabolic fatigue protocol. Biodex® balance system and lactometer were used for evaluation of balance and blood lactate level (respectively). For statistical analysis, the Pearson correlation coefficient, paired t-test, sample t and ANOVA tests were used. Results: Based on these study results, the static balance alterations in the experimental group (eyes open and eyes closed positions) were respectively 0.16% and 3.17%, and this was not statistically meaningful. Also, dynamic balance alterations in the experimental group (eye opened and eye closed positions) were 0.12% and 0.41% (respectively) which was not statistically meaningful. There was not a significant relationship between lactate acid accumulation and variations of the stability indices (r=-0/570, p<0.05). Conclusion: one of the best explanations for the absence of alteration in wrestlers balance is that: the fatiguing protocol exerted in this study is "in context" and "similar" to wrestling training and this can cause the wrestlers to utilize an anticipatory postural adjustment system for further maintaining postural stability. The possible mechanisms responsible for limiting the effect of fatigue on static and dynamic stability include: an alteration in afferent sensory inputs, a decrease in postural adjustment, increase in COP displacement, increase in delay time and decease in muscular activity, alteration in proprioception and the dysfunction of contractile units in anti gravity muscle following fatigue.

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The Effect of Exhausting Exercise Induced Muscular Fatigue On Functional Stability

Cited by 11 publications

References 47 publications

The effects of neck muscular fatigue on static and dynamic postural control in elite male volleyball players

The effects of neck muscular fatigue on static and dynamic postural control in elite male volleyball players

Neck muscle fatigue alters upper limb proprioception

Balance and Fatigue in Wrestlers

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