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Isotonic and Isometric Muscle Contractions01:22

Isotonic and Isometric Muscle Contractions

Two primary types of muscle contractions are isotonic and isometric, each serving unique functions and involving distinct mechanisms. Both isotonic and isometric contractions are integral to the body's complex system of movement and stability. Isotonic exercises contribute significantly to functional strength and movement, while isometric contractions are crucial for maintaining posture and joint stability.
Isotonic contractions
Isotonic contractions occur when a muscle changes length while the...
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Splenic constriction during isometric handgrip exercise in humans.

Maria F Frances1, Zeljko Dujic, J Kevin Shoemaker

  • 1School of Kinesiology, the University of Western Ontario, London, ON N6A3K7, Canada.

Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquee, Nutrition Et Metabolisme
|October 17, 2008
PubMed
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Isometric handgrip exercise causes the spleen to constrict, increasing venous return. This study found spleen volume decreased during handgrip exercise, lower-body negative pressure, and Valsalva

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Area of Science:

  • Human Physiology
  • Cardiovascular Regulation
  • Exercise Physiology

Background:

  • Isometric handgrip (HG) exercise increases cardiac output without changing systemic vascular conductance.
  • The mechanism for increased venous return during HG exercise is unclear, with visceral organ constriction a potential factor.
  • The spleen, a compliant, highly perfused organ, is known to constrict during severe physiological stresses.

Purpose of the Study:

  • To test the hypothesis that the human spleen constricts during isometric handgrip (HG) exercise.
  • To investigate the reflex specificity of spleen constriction.
  • To assess the impact of breathing and intra-abdominal pressures on spleen response during HG exercise.

Main Methods:

  • Eight participants performed 1-minute isometric HG tests at 40% maximum voluntary contraction.
  • Ultrasound imaging measured splenic dimensions (length and width) to calculate splenic volume.
  • Spleen dimensions were also measured during lower-body negative pressure (LBNP) and Valsalva's maneuver (VM) to assess reflex specificity and pressure effects.

Main Results:

  • Isometric HG exercise, LBNP, and VM all induced significant reductions in splenic length and width (4.44%-6.09%; p < 0.05).
  • Relative reductions in splenic volume were observed: 13 ± 1% for HG, 9 ± 7% for LBNP, and 18 ± 7% for VM (p < 0.05).
  • These findings indicate spleen constriction occurs during these maneuvers.

Conclusions:

  • The human spleen constricts during the initial minute of isometric handgrip exercise.
  • Spleen constriction is not exclusive to severe stresses and can occur during moderate isometric exercise.
  • The spleen's response to HG exercise may contribute to the observed increase in venous return.