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This case study evaluated the effect of implanted multi-joint neuromuscular electrical stimulation (NMES) gait assistance on oxygen consumption relative to walking without NMES after stroke. The participant walked slowly with an asymmetric gait pattern after stroke. He completed repeated six-minute walk tests at a self- selected walking speed with and without hip, knee and ankle stimulation assistance. His walking speed with NMES more than doubled from 0.28±0.01 m/s to 0.58±0.04 m/s while average step length and cadence increased by 0.12 m and 24 steps/min, respectively. As a result, energy cost of walking with NMES decreased by 0.19 ml O2/kg/m as compare to walking without stimulation while oxygen consumption increased by 1.1 METs (3.9 ml O2/kg/min). These metabolic demands are similar to those reported for stroke survivors capable of walking at equivalent speeds without stimulation, suggesting the increase in oxygen consumption and decreased energy cost result from improved efficiency of faster walking facilitated by NMES. While the effect of NMES on gait economy has implications for community walking within the user's metabolic reserves, this case study's results should be interpreted with caution and the hypothesis that multi-joint NMES improves metabolic efficiency should be tested in a wide population of stroke survivors with varied deficits.
This article was published in the following journal.
Name: American journal of physical medicine & rehabilitation
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The rate at which oxygen is used by a tissue; microliters of oxygen STPD used per milligram of tissue per hour; the rate at which oxygen enters the blood from alveolar gas, equal in the steady state to the consumption of oxygen by tissue metabolism throughout the body. (Stedman, 25th ed, p346)
An activity in which the body advances at a slow to moderate pace by moving the feet in a coordinated fashion. This includes recreational walking, walking for fitness, and competitive race-walking.
A measurement of OXYGEN uptake in a sitting, resting person (resting oxygen consumption), varying with age, sex, race, and other factors. In normal adult men, one MET is approximately 3.5 ml O2/kg/min of body weight. Oxygen uptake during activities or work can be measured in METs which can be use to determine health status and exercise prescription.
The use of peripheral nerve stimulation to assess transmission at the NEUROMUSCULAR JUNCTION, especially in the response to anesthetics, such as the intensity of NEUROMUSCULAR BLOCKADE by NEUROMUSCULAR BLOCKING AGENTS.
The rate at which steps are made while walking.
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Neurology - Central Nervous System (CNS)
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Stroke - Cerebrovascular Disease (CVA)
A stroke is a serious medical condition that occurs when the blood supply to part of the brain is cut off. Strokes are a medical emergency and prompt treatment is essential because the sooner a person receives treatment for a stroke, the less damage is ...