Abstract
Purpose
Sex hormones have profound effects on the nervous system in vitro and in vivo. The present study examines the effect of the menstrual cycle on maximal isometric force (MVC) and tremor during an endurance task.
Methods
Nine eumenorrheic females participated in five study visits across their menstrual cycle. In each menstrual phase, an MVC and an endurance task to failure were performed. Tremor across the endurance task was quantified as the coefficient of variation in force and was assessed in absolute time and relative percent time to task failure.
Results
MVC decreases 23 % from ovulation to the mid luteal phase of the menstrual cycle. In absolute time, the mid luteal phase has the highest initial tremor, though the early follicular phase has substantially higher tremor than other phases after 150 s of task performance. In relative time, the mid luteal phase has the highest level of tremor throughout the endurance task.
Conclusions
Both MVC and tremor during an endurance task are modified by the menstrual cycle. Performance of tasks and sports which require high force and steadiness to exhaustion may be decreased in the mid luteal phase compared to other menstrual phases.
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Abbreviations
- ANOVA:
-
Analysis of variance
- BBT:
-
Basal body temperature
- ERα:
-
Estrogen receptor alpha
- GABA:
-
Γ-aminobutyric acid
- MVC:
-
Maximal voluntary contraction
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Communicated by William J. Kraemer.
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Tenan, M.S., Hackney, A.C. & Griffin, L. Maximal force and tremor changes across the menstrual cycle. Eur J Appl Physiol 116, 153–160 (2016). https://doi.org/10.1007/s00421-015-3258-x
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DOI: https://doi.org/10.1007/s00421-015-3258-x