Quadriceps muscle strength and dynamic stability in elderly persons

Scarborough, Donna Moxley; Krebs, David E.; Harris, Bette Ann

doi:10.1016/s0966-6362(99)00018-1

Cited by 196 publications

(157 citation statements)

References 25 publications

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“…31 We assume that such activity per se could improve the strength and endurance of muscles participating in control of posture, especially in participants with minimal function before the training. 24,32,33 Furthermore, our balance training program included exercises that closely mimicked reaching in standing tasks, thereby providing muscle activation associated with functional challenge of maintaining balance. 24,[34][35][36] We, therefore, suggest that the improved function during dynamic tasks might be at least partially attributed to enhancements of the muscle properties.…”

Section: Potential Mechanismsmentioning

confidence: 99%

Positive effect of balance training with visual feedback on standing balance abilities in people with incomplete spinal cord injury

et al. 2010

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Objectives: (1) To evaluate the learning potential and performance improvements during standing balance training with visual feedback (VBT) in individuals with incomplete spinal cord injury (SCI) and (2) to determine whether standing static and dynamic stability during training-irrelevant tasks can be improved after the VBT. Setting: National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Japan. Methods: Six participants with chronic motor and sensory incomplete SCI who were able to stand for at least 5 min without any form of assistive device performed the VBT, 3 days per week, for a total of 12 sessions. During the training, participants stood on a force platform and were instructed to shift their center of pressure in the indicated directions as represented by a cursor on a monitor. The performance and the rate of learning were monitored throughout the training period. Before and after the program, static and dynamic stability was assessed. Results: All participants showed substantial improvements in the scores, which varied between 236 ± 94 and 130 ± 14% of the initial values for different exercises. The balance performance during training-irrelevant tasks was significantly improved: for example, the area inside the stability zone after the training reached 221 ± 86% of the pre-training values. Conclusion: Postural control can be enhanced in individuals with incomplete SCI using VBT. All participants showed substantial improvements during standing in both game performance and training-irrelevant tasks after the VBT.

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Section: Potential Mechanismsmentioning

confidence: 99%

Positive effect of balance training with visual feedback on standing balance abilities in people with incomplete spinal cord injury

et al. 2010

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“…Weaker subjects were also found to use less peak momentum. Scarborough reported a similar finding in a correlational analysis of chair rise [46]. Puniello et al concluded that weaker disabled elders used a more conservative and stable lifting strategy then their stronger counterparts [9].…”

Section: Subjectsmentioning

confidence: 68%

Lower-limb extensor power and lifting characteristics in disabled elders

Dancewicz

Krebs²,

McGibbon³

2003

JRRD

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Abstract-Few reports address lifting in disabled elders.Resistance training may facilitate function by improving coordination and muscular recruitment in common lifting tasks. Subjects were considered "functionally limited" if they reported a limitation in at least 1 of 9 possible functional areas listed on the Short-Form Health Survey physical function scale (SF-36), excluding the vigorous activity item. Eighty-nine functionally limited elders (60.3 to 89.8 years old) consented to participate in an intervention trial consisting of a 6-month inhome video-facilitated resistance exercise program using elastic bands. Biomechanical variables (leg extensor power, work, squared jerk), temporal outcomes (lift time and time to peak leg powers), and leg extensor strength were analyzed with the use of analysis of variance (ANOVA) between the (1) experimental group versus control group and the (2) subgroup of the weakest third of subjects (pretest leg extensor strength as percent of body weight [BW]). The experimental group had significant improvements in strength in knee extension (16.7%) and hip extension (20.5%). Resistance-trained weak subjects significantly increased hip extension strength compared to controls. A trend toward improved performance in liftingdecreased total lift time-was noted in the resistance-trained subjects. Significant correlations were found between total leg extension power, total leg extension strength, total work, and lift time. Resistance-trained disabled elders demonstrated strength benefits and several trends consistent with improved coordination and more efficient lifting. Leg-muscle power was related to better functional performance in lifting.

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“…Quadriceps weakness is a hallmark impairment following ACL injury (Eastlack et al, 1999;Rudolph et al, 2001) as well as in individuals with knee osteoarthritis (OA) (Hurley and Newham, 1993;Fisher et al, 1997), and is a better determinant of functional limitations and disability in persons with OA than plain radiographic changes (McAlindon et al, 1993;Hurley et al, 1997). Impairment of quadriceps function has been correlated with increased fall risk (Lord et al, 1999), slower walking speed (Gibbs et al, 1996;Connelly and Vandervoort, 1997;Moxley Scarborough et al, 1999), slower speed of sit-to-stand tasks (Moxley Scarborough et al, 1999), and longer time to complete a stair-climbing task (Walsh et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Gluteus maximus and soleus compensate for simulated quadriceps atrophy and activation failure during walking

Thompson

Chaudhari

Schmitt

et al. 2013

Journal of Biomechanics

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Important activities of daily living, like walking and stair climbing, may be impaired by muscle weakness. In particular, quadriceps weakness is common in populations such as those with knee osteoarthritis (OA) and following ACL injury and may be a result of muscle atrophy or reduced voluntary muscle activation. While weak quadriceps has been strongly correlated with functional limitations in these populations, the important cause-effect relationships between abnormal lower extremity muscle function and patient function remain unknown. The purpose of this study was to explore possible muscle compensation strategies and changes in contribution to support and progression to maintain gait kinematics in response to two sources of quadriceps weakness: atrophy and activation failure. We used muscle-driven simulations to track normal gait kinematics in healthy subjects and applied simulated quadriceps weakness as atrophy and activation failure to evaluate compensation patterns associated with the individual sources of weakness. We found that the gluteus maximus and soleus muscles display the greatest ability to compensate for simulated quadriceps weakness. Relative to the baseline behavior of the muscles, the soleus compensates more to counteract activation deficits in the quadriceps and the gluteus maximus compensates more to counteract atrophy in the quadriceps. The development of this method for estimating the compensation strategies that are necessary to maintain normal gait will enable investigations of the role of muscle weakness in abnormal gait and inform potential rehabilitation strategies to improve such conditions.

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Quadriceps muscle strength and dynamic stability in elderly persons

Cited by 196 publications

References 25 publications

Positive effect of balance training with visual feedback on standing balance abilities in people with incomplete spinal cord injury

Positive effect of balance training with visual feedback on standing balance abilities in people with incomplete spinal cord injury

Lower-limb extensor power and lifting characteristics in disabled elders

Gluteus maximus and soleus compensate for simulated quadriceps atrophy and activation failure during walking

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