Efficiency of work production by spastic muscles

Stoquart, Gaëtan; Detrembleur, Christine; Nielens, Henri; Lejeune, Thierry

doi:10.1016/j.gaitpost.2004.11.004

Cited by 25 publications

(24 citation statements)

References 26 publications

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“…48 Another study applied a bicycle ergometer in hemiparetic or spastic patients with chronic stroke, where patients were pedaling with only 1 lower limb. 49 This study observed that the efficiency of positive work production in stroke patients was comparable to healthy subjects, despite significant neurologic impairments.…”

Section: Lower Limbsmentioning

confidence: 75%

Stroke-Related Sarcopenia: Specific Characteristics

Scherbakov

Sandek

Doehner

2015

Journal of the American Medical Directors Association

136

115

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Section: Lower Limbsmentioning

confidence: 75%

Stroke-Related Sarcopenia: Specific Characteristics

Scherbakov

Sandek

Doehner

2015

Journal of the American Medical Directors Association

136

115

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“…This finding is contrary to previous research that has demonstrated that increased spasticity results in increased energy expenditure. 31 It also has been suggested that spasticity may promote a favorable body composition and muscle mass. 32 Accordingly, it may be that our findings are indicative of the inability of BMI to differentiate between fat-and fat-free mass.…”

Section: Discussionmentioning

confidence: 99%

Secondary complications and subjective well-being in individuals with chronic spinal cord injury: associations with self-reported adiposity

et al. 2010

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Study design: This is a cross-sectional study. Objectives: To examine the associations between adiposity, secondary complications and subjective well-being (SWB) in individuals with spinal cord injury (SCI). Results: Controlling for covariates, individuals who reported being overweight were more likely to have a history of overuse injuries and fatigue, experienced a greater impact of overuse injuries and fatigue, had greater pain and depressive symptoms, and had lower satisfaction with life than individuals who did not report being overweight. BMI was only associated with an increased likelihood of reporting spasticity. Conclusion: Self-reported overweight status was associated with an increased prevalence of certain secondary complications and lower SWB. Future prospective studies should examine whether reductions in adiposity are associated with changes in the prevalence and the impact of secondary complications and SWB.

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“…For example, Wutzke et al (2012) have proposed that the hip muscles may be less efficient when replacing the work normally performed at the ankle, without having to perform more work overall. However, in the case of stroke patients, the elevated metabolic cost of walking appears to be explained by greater mechanical work (Detrembleur et al, 2003), without differences in muscle efficiency (Stoquart et al, 2005(Stoquart et al, , 2012.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and energetic consequences of reduced ankle plantarflexion in human walking

Huang

Shorter

Adamczyk

et al. 2015

Journal of Experimental Biology

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The human ankle produces a large burst of 'push-off' mechanical power late in the stance phase of walking, reduction of which leads to considerably poorer energy economy. It is, however, uncertain whether the energetic penalty results from poorer efficiency when the other leg joints substitute for the ankle's push-off work, or from a higher overall demand for work due to some fundamental feature of push-off. Here, we show that greater metabolic energy expenditure is indeed explained by a greater demand for work. This is predicted by a simple model of walking on pendulum-like legs, because proper push-off reduces collision losses from the leading leg. We tested this by experimentally restricting ankle push-off bilaterally in healthy adults (N=8) walking on a treadmill at 1.4 m s −1 , using ankle-foot orthoses with steel cables limiting motion. These produced up to ∼50% reduction in ankle pushoff power and work, resulting in up to ∼50% greater net metabolic power expenditure to walk at the same speed. For each 1 J reduction in ankle work, we observed 0.6 J more dissipative collision work by the other leg, 1.3 J more positive work from the leg joints overall, and 3.94 J more metabolic energy expended. Loss of ankle push-off required more positive work elsewhere to maintain walking speed; this additional work was performed by the knee, apparently at reasonably high efficiency. Ankle push-off may contribute to walking economy by reducing dissipative collision losses and thus overall work demand.

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Efficiency of work production by spastic muscles

Cited by 25 publications

References 26 publications

Stroke-Related Sarcopenia: Specific Characteristics

Stroke-Related Sarcopenia: Specific Characteristics

Secondary complications and subjective well-being in individuals with chronic spinal cord injury: associations with self-reported adiposity

Mechanical and energetic consequences of reduced ankle plantarflexion in human walking

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