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Lookup NU author(s): Dr Marika Noorkoiv
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Postmenopausal monozygotic twin pairs discordant for hormone replacement therapy (HRT) provide an advantageous study design controlling for genetic background for elucidating the relationships between aging, sex hormone levels, muscle strength, contractile capacity, and fatigability.Thirteen postmenopausal monozygotic twin pairs discordant for HRT were measured for maximal voluntary torque (MVC) and twitch characteristics using electrical stimulation before and after intermittent dynamic plantarflexor exercise until exhaustion.Peak twitch torque was 32% higher in HRT users than in their non-HRT, genetically identical sisters (P = 0.002), but MVC did not differ. There were no differences in the activation level or twitch time characteristics between the co-twins. Fatigue caused decreases in MVC (P = 0.001), twitch torque (P = 0.001), time to peak (P = 0.013), and half-relaxation time (P = 0.001) similarly in HRT users and non-HRT users.In early postmenopausal women, involuntary but not voluntary force-generating mechanisms of the plantarflexors are augmented by the use of HRT.
Author(s): Finni T, Noorkoiv M, Pöllänen E, Ronkainen PHA, Alén M, Kaprio J, Kovanen V, Sipilä S
Publication type: Article
Publication status: Published
Journal: Muscle & Nerve
Print publication date: 17/10/2011
ISSN (print): 0148-639X
ISSN (electronic): 1097-4598
Publisher: John Wiley & Sons, Inc.
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