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Method to Measure Tone of Axial and Proximal Muscle
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Maximal force and tremor changes across the menstrual cycle.

Matthew S Tenan1, Anthony C Hackney2,3, Lisa Griffin4

  • 1Human Research and Engineering Directorate, RDRL-HRS-B, US Army Research Laboratory, Aberdeen Proving Ground, MD, USA. matthew.s.tenan.civ@mail.mil.

European Journal of Applied Physiology
|September 15, 2015
PubMed
Summary

Maximal isometric force and tremor during endurance tasks are influenced by the menstrual cycle. Performance requiring high force and steadiness may be reduced in the mid-luteal phase.

Keywords:
EstrogenFatigueMaximal forceMenstrual cycleProgesteroneTremor

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Endocrinology

Background:

  • Sex hormones significantly impact nervous system function.
  • The menstrual cycle involves dynamic hormonal fluctuations.
  • Understanding these hormonal effects on neuromuscular performance is crucial.

Purpose of the Study:

  • To investigate the influence of the menstrual cycle on maximal isometric force (MVC).
  • To examine changes in tremor during an endurance task across different menstrual phases.
  • To correlate hormonal shifts with neuromuscular output and stability.

Main Methods:

  • Nine eumenorrheic females underwent five study visits synchronized with their menstrual cycle.
  • Maximal isometric force (MVC) and an endurance task to failure were performed at each visit.
  • Tremor was quantified using coefficient of variation in force, analyzed in absolute and relative time.

Main Results:

  • MVC decreased by 23% from ovulation to the mid-luteal phase.
  • The mid-luteal phase showed the highest initial tremor, while the early follicular phase exhibited increased tremor after 150 seconds.
  • Relative tremor analysis indicated the highest levels throughout the endurance task during the mid-luteal phase.

Conclusions:

  • The menstrual cycle significantly modifies both maximal isometric force and tremor during endurance tasks.
  • Activities demanding high force and sustained steadiness may be compromised during the mid-luteal phase.
  • These findings have implications for female athletes and individuals in physically demanding occupations.