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• W154783896 abstract "Decreased force production capability in a muscle is a natural consequence of prolonged, intense muscular exercise.1 The causes of task failure during fatiguing exercise may arise from spinal or supraspinal central factors, such as decreased central drive, or other peripheral factors occurring distal to the neuromuscular junction, such as accumulation of metabolic by-products.2–4 Muscle fatigue can be reliably indexed5,6 as a shift in motor unit recruitment from higher-frequency to lower-frequency motor units, measured with surface electromyography (EMG). Muscle fatigue may contribute to decreased joint stability as a result of impaired joint proprioception7–9 and reduced muscle activation10 and may require neuromuscular compensations in order to maintain normal function during activity.11–14Persons with low back pain tend to have poor muscular strength and rapid fatigue rates in the lumbar flexors and extensors.15 The onset and progression to fatigue are probably more rapid in muscles that have poor strength and endurance. Therefore, the rate of fatigue in muscles that provide support to the lumbar spine during exercise may be greater in those with low back pain. Persons with low back pain who fatigue more rapidly during isometric lumbar paraspinal exercise have greater amounts of quadriceps inhibition (ie, less quadriceps activation).16 This finding suggests an association between isometric lumbar extension endurance and muscle inhibition but does not address the short-term consequences to lower extremity muscle after lumbar paraspinal muscle fatigue. To date, no authors have measured the acute effects of lumbar paraspinal fatiguing exercise on quadriceps activation.Muscle inhibition has been described as the diminished ability to contract a muscle voluntarily17 and can result from muscle fatigue10 or simulated joint effusion.18 When a muscle is inhibited, regardless of the cause, it is unable to voluntarily recruit all motor units in its motor neuron pool. Despite previous research findings,19,20 not all mechanisms of muscle inhibition are known. In the lower extremity, quadriceps inhibition commonly follows knee joint injury.17 Insufficient strength due to excessive quadriceps inhibition may alter gait patterns21 or cause compensatory force attenuation strategies during landing22 that may leave lower extremity joints at risk for injury. Comprehending the acute relationship between the lumbar paraspinals and quadriceps may lead to a better understanding of the neuromuscular adaptations that may occur in the lower extremity in response to fatiguing lumbar extension exercise. Therefore, our purpose was to compare quadriceps activation (QA) after isometric lumbar fatiguing exercise in persons with low back pain and healthy individuals with no history of low back pain." @default.
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• W154783896 date "2006-01-01" @default.
• W154783896 modified "2023-10-01" @default.
• W154783896 title "Reduced quadriceps activation after lumbar paraspinal fatiguing exercise." @default.
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• W154783896 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1421484" @default.
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