PainSci summary of Nakazawa 1997?This page is one of thousands in the PainScience.com bibliography. It is not a general article: it is focused on a single scientific paper, and it may provide only just enough context for the summary to make sense. Links to other papers and more general information are provided at the bottom of the page, as often as possible.
From the abstract: “All subjects showed that both short and long latency stretch reflex FMG activities of muscle biceps brachii were reduced immediately after 20 days bed rest, and then recovered gradually to pre-bed rest levels at one- to two-months after bed rest ....” Note, however, that another muscle studied did not show reflex degeneration in the same conditions.
original abstract†Abstracts here may not perfectly match originals, for a variety of technical and practical reasons. Some abstacts are truncated for my purposes here, if they are particularly long-winded and unhelpful. I occasionally add clarifying notes. And I make some minor corrections.
Stretch reflex responses of m. biceps brachii and m. brachioradialis of ten normal adults were studied before and after 20 days of strict bed rest. A standard torque perturbation (15 Nm, 170 ms) was applied to the forearm to induce reflex electromyographic (EMG) activities of the two muscles investigated. Totally 30 perturbations were applied during submaximal isometric elbow flexion movements at 80 deg flexed joint angle, and ensemble averaged EMG waveforms were calculated by aligning the signal to the onset of perturbations. All subjects showed that both short and long latency stretch reflex FMG activities of m. biceps brachii were reduced immediately after 20 days bed rest, and then recovered gradually to pre-bed rest levels at one- to two-months after bed rest, whereas there was no such variation in the stretch reflex induced in m. brachioradialis. It was demonstrated that the muscle stretch reflex gain might be reduced with long-term inactivity, but the effects on stretch reflex gains were different in the two tested muscles.
One article on PainScience.com cites Nakazawa 1997 as a source:
- The Trouble with Chairs — The science of being sedentary and how much it does (or doesn’t) affect your health and back pain
This page is part of the PainScience BIBLIOGRAPHY, which contains plain language summaries of thousands of scientific papers & others sources. It’s like a highly specialized blog. A few highlights:
- Effectiveness of customised foot orthoses for Achilles tendinopathy: a randomised controlled trial. Munteanu 2015 Br J Sports Med.
- A Bayesian model-averaged meta-analysis of the power pose effect with informed and default priors: the case of felt power. Gronau 2017 Comprehensive Results in Social Psychology.
- The neck and headaches. Bogduk 2014 Neurol Clin.
- Agreement of self-reported items and clinically assessed nerve root involvement (or sciatica) in a primary care setting. Konstantinou 2012 Eur Spine J.
- Effect of NSAIDs on Recovery From Acute Skeletal Muscle Injury: A Systematic Review and Meta-analysis. Morelli 2017 Am J Sports Med.