Control of Balance Differs After Knee or Ankle Fatigue in Older Women

Bellew, James W.; Fenter, Paula Click

doi:10.1016/j.apmr.2006.08.020

Cited by 56 publications

(53 citation statements)

References 23 publications

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“…Several studies have reported the diVerential eVects of LMF at diVerent locations on postural control, with some mixed results (Kwon et al 1998;Gribble and Hertel 2004a, b;Bellew and Fenter 2006;Salavati et al 2007). Results from these studies suggest that the eVects of fatigue on postural control are speciWc to the muscle groups recruited and measures of postural control used.…”

Section: Introductionmentioning

confidence: 88%

Acute effects of localized muscle fatigue on postural control and patterns of recovery during upright stance: influence of fatigue location and age

et al. 2009

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The purposes of this study were to investigate the effects of fatigue location and age on changes in postural control induced by localized muscle fatigue, as well as the patterns of recovery post-fatigue. Groups of 16 younger (18-25 years) and 16 older (55-65 years) participants performed submaximal isotonic fatiguing exercises involving the unilateral ankle plantar flexors, knee extensors, and shoulder flexors, and bilateral lumbar extensors. Postural control was assessed during quiet upright stance, from center-of-pressure and center-of-mass time series obtained before and after the fatiguing exercises. Acute effects of fatigue differed between joints, with the most substantial effects evident at the lower back, followed by the ankle. Neither knee nor shoulder fatigue resulted in significant effects on postural control. Significant acute effects of fatigue were found only among the younger group. Recovery of postural control post-fatigue was influenced by age, being more rapid in the younger group, but not by fatigue location. Along with existing evidence, these results may facilitate the development of strategies to prevent occupational falls.

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Section: Introductionmentioning

confidence: 88%

Acute effects of localized muscle fatigue on postural control and patterns of recovery during upright stance: influence of fatigue location and age

et al. 2009

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“…Further studies should be undertaken to investigate these findings. Bellew and Fenter 29 demonstrated that static postural control was impaired after ankle musculature fatigue but not after knee musculature fatigue. Evaluating the postural control is an alternative method to determine the combination of peripheral, vestibular, and visual contributions to neuromuscular control, so the results of their study might be comparable with ours.…”

Section: Discussionmentioning

confidence: 99%

Military Exercises, Knee and Ankle Joint Position Sense, and Injury in Male Conscripts: A Pilot Study

Mohammadi

Azma

Naseh

et al. 2013

Journal of Athletic Training

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Context: The high incidence of lower limb injuries associated with physical exercises in military conscripts suggests that fatigue may be a risk factor for injuries. Researchers have hypothesized that lower limb injuries may be related to altered ankle and knee joint position sense (JPS) due to fatigue.Objective: To evaluate if military exercises could alter JPS and to examine the possible relation of JPS to future lower extremity injuries in military service.Design: Cohort study. Setting: Laboratory. Patients or Other Participants: A total of 50 male conscripts (age ¼ 21.4 6 2.3 years, height ¼ 174.5 6 6.4 cm, mass ¼ 73.1 6 6.3 kg) from a unique military base were recruited randomly.Main Outcome Measure(s): Participants performed 8 weeks of physical activities at the beginning of a military course. In the first part of the study, we instructed participants to recognize predetermined positions before and after military exercises so we could examine the effects of military exercise on JPS. The averages of the absolute error and the variable error of 3 trials were recorded. We collected data on the frequency of lower extremity injuries over 8 weeks. Next, the participants were divided into 2 groups: injured and uninjured. Separate 2 3 2 3 2 (group-by-time-by-joint) mixed-model analyses of variance were used to determine main effects and interactions of these factors for each JPS measure. In the second part of the study, we examined whether the effects of fatigue on JPS were related to the development of injury during an 8-week training program. We calculated Hedges effect sizes for JPS changes postexercise in each group and compared change scores between groups.Results: We found group-by-time interactions for all JPS variables (F range ¼ 2.86-4.05, P , .01). All participants showed increases in JPS errors postexercise (P , .01), but the injured group had greater changes for all the variables (P , .01).Conclusions: Military conscripts who sustained lower extremity injuries during an 8-week military exercise program had greater loss of JPS acuity than conscripts who did not sustain injuries. The changes in JPS found after 1 bout of exercise may have predictive ability for future musculoskeletal injuries.Key Words: fatigue, proprioception, lower extremity, muscles Key PointsAfter an 8-week military exercise program, the loss of joint position sense (JPS) acuity was greater in injured than in uninjured conscripts. The JPS changes were greater in the ankle than in the knee joint. Greater JPS changes postexercise might increase the risk of subsequent musculoskeletal injury during basic training.

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“…In electromyographic fatigue, the median frequency can be observed to reduce, indicating a lower frequency of muscle motor unit firing. During the tasks undertaken in this study, the group with a history of falling had lower median frequencies than the group without a history of falling in both muscles tested, indicating a lower motor unit firing rate, which translates into a greater tendency to fatigue, and this decline could be a primary factor in the incidence of falls among the elderly 26 . Muscle fatigue causes changes in the neuromuscular system, resulting in reduced muscle performance.…”

Section: Discussionmentioning

confidence: 99%

Análise da fadiga muscular localizada em idosas caidoras e não caidoras através de parâmetros de frequência do sinal eletromiográfico

Silva

Pedroni

Navega

et al. 2014

Rev. Bras. Cineantropom. Desempenho Hum.

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-One of the problems that most concerns the elderly population is the falling, which can be caused by muscle fatigue. The objective of this study was to compare median electromyographic frequency values for the vastus lateralis muscle and the lateral portion of the gastrocnemius muscle (as parameters of electromyographic fatigue) in elderly people with and without a history of falls. A total of 20 healthy, physically active, elderly women who had or had not suffered falls were enrolled on the study. Median electromyographic signal frequencies were analyzed for the vastus lateralis muscle and the lateral portion of the gastrocnemius muscle in isometric contraction. ANOVA and Student's t test were used for comparisons, to a cutoff of p ≤ 0.05. Median frequencies for the gastrocnemius and vastus lateralis muscles were both higher in the group with a history of falling, but without statistical significance. It was also observed that the rate of decline in median frequency was greater in the group with a history of falling. It can be concluded that elderly people with a history of falling have a greater tendency to fatigue of the gastrocnemius and vastus lateralis muscles than their peers with no history of falling.

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Control of Balance Differs After Knee or Ankle Fatigue in Older Women

Cited by 56 publications

References 23 publications

Acute effects of localized muscle fatigue on postural control and patterns of recovery during upright stance: influence of fatigue location and age

Acute effects of localized muscle fatigue on postural control and patterns of recovery during upright stance: influence of fatigue location and age

Military Exercises, Knee and Ankle Joint Position Sense, and Injury in Male Conscripts: A Pilot Study

Análise da fadiga muscular localizada em idosas caidoras e não caidoras através de parâmetros de frequência do sinal eletromiográfico

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