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It's worth checking her thyroid function:

"Some studies have related hypothyroidism to muscle dysfunction... Furthermore, studies ... demonstrated that thyroid hormone action on skeletal muscles affects mainly type-I muscle fibers, which promote slow contractions and are most prevalent in the postural muscles recruited during prolonged effort" [1]

Also, not sure where you are in the world but your doctor telling you your thyroid hormone levels are ok unfortunately may not necessarily mean they are ok... There is a controversy about reference ranges amongst experts [2], and I think it's wise to pay attention to that.

[1] http://www.scielo.br/pdf/abc/v87n3/en_a33v87n3.pdf

[2] http://www.ncbi.nlm.nih.gov/pubmed/16148345

Hmm thanks for the tip I'll look in to that for sure. Coincidentally, her thiroid levels are being monitored by her doctor after pregnancy. One of them was low if I remember correctly.

You're welcome, hope it works out.

BTW, I think this is also worth highlighting (from [1] above):

"Different metabolic changes, yet with similar consequences, may therefore be observed in both hypothyroid and hyperthyroid patients. In the first case, fatigue is directly related to deficient action of thyroid hormones. In the latter, however, the cause is mainly depletion of muscle energy substrate due to high metabolic demand."

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