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1 Institute of Sports Medicine, Copenhagen, Bispebjerg Hospital, Copenhagen, Denmark
2 Department of Endocrinology, Aarhus University Hospital, Aarhus, Denmark
3 Osteoporosis and Metabolic Bone Unit, Department of Clinical Biochemistry, Copenhagen University Hospitals, Copenhagen, Denmark
4 Division of Molecular Physiology, Faculty of Life Sciences, University of Dundee, Dundee, United Kingdom
5 Division of Molecular Physiology, Faculty of Life Sciences, University of Dundee, Dundee, United Kingdom; Graduate Medical School, Derby City General Hospital, University of Nottingham, Derby, United Kingdom
* To whom correspondence should be addressed. E-mail: b.miller{at}aucland.ac.nz.
We tested the hypothesis that acute exercise would stimulate synthesis of myofibrillar protein and intramuscular collagen in women and that the phase of the menstrual cycle at which the exercise took place would influence the extent of the change. Fifteen young, healthy female subjects were studied either in the follicular (FP, n=8) or the luteal (LP, n=7, n=1 out of phase) 24 h after an acute bout of one-legged exercise (60 min kicking at 67 % Wmax), samples being taken from the vastus lateralis in both the exercised and resting legs. Rates of synthesis of both myofibrillar and muscle collagen proteins were measured by the incorporation of [13C]leucine. Myofibrillar protein synthesis (means±SD; rest FP: 0.053±0.009 %/h, LP: 0.055±0.013 %/h) was increased at 24-h post exercise (FP: 0.131±0.018 %/h, p<0.05, LP: 0.134±0.018 %/h, p<0.05) with no differences between phases. Similarly, muscle collagen synthesis (rest FP: 0.024±0.017 %/h, LP: 0.021±0.006 %/h) was elevated at 24-h post-exercise (FP: 0.073±0.016 %/h, p<0.05, LP: 0.072±0.015 %/h, p<0.05), but the responses did not differ between menstrual phases. Therefore, there is no effect of menstrual cycle phase at rest or in the response to an acute bout of exercise, on myofibrillar protein synthesis and muscle collagen synthesis in women.
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