Cited by 47Cardiovascular and exercise physiologyMuscle activation and electromyography studiesThermoregulation and physiological responses

Effects of blood pressure on force production in cat and human muscle

Hobbs, S. F., McCloskey, D. I.·1987·Journal of Applied Physiology

Abstract

In anesthetized cats reducing local arterial pressure from 125 to 75 Torr decreased blood flow (53 +/- 5%) and force production (57 +/- 7%) in soleus and medial gastrocnemius. Force was produced in these muscles by aerobic, slowly fatiguing fibers. Similar reductions in arterial pressure did not affect force production in caudofemoralis, which contains mainly fast-fatiguing fibers. In human subjects the electromyogram produced by the ankle extensors during rhythmic constant-force contractions increased as the contracting muscles were raised above the heart during legs-up tilt. This suggests that force production of active muscle fibers at a given level of activation fell with muscle perfusion pressure, thus requiring augmentation of muscle activity to sustain the standard contractions. Because aerobic fibers contributed to these contractions, it appears that force production of human muscle fibers is sensitive to small changes in perfusion pressure and, presumably, blood flow. The critical dependence of developed muscular force on blood pressure is of importance to motor control and may also play a significant role in cardiovascular control during exercise.

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Crossref · 10.1152/jappl.1987.63.2.834

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Authors
Hobbs, S. F., & McCloskey, D. I.
Affiliations
UNSW Sydney (AU)
Venue
Journal of Applied Physiology
Published
1987-08-01
Volume
63
Issue
2
Pages
834-839
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2269032007
Cited by
47
References
0
Citations by year
2025: 3 · 2022: 2 · 2021: 1 · 2019: 3 · 2016: 1 · 2015: 2 · 2013: 1
FWCI
4.97
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Physical Sciences › Engineering › Biomedical Engineering › Muscle activation and electromyography studies
  • Health Sciences › Medicine › Physiology › Thermoregulation and physiological responses
Keywords
blood pressure, muscle force production, blood flow, soleus muscle, medial gastrocnemius, ankle extensors, electromyography, motor control, cats, human
MeSH terms
Animals, Blood Pressure, Cats, Electromyography, Hindlimb, Humans, Leg, Muscles, Regional Blood Flow

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