Association of serum TSH with handgrip strength in community-dwelling euthyroid elderly

Beom Jun Kim, Seung Hun Lee, Carlos M Isales, Mark W Hamrick, Mi Kyung Kwak, Jung Min Koh

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Context: Despite apparent muscle weakness in overt or even subclinical hyperthyroidism, the effects of thyroid function in the reference range on muscle strength are unknown. Objective: To investigate the association of serum TSH and free T4 with handgrip strength (HGS) in euthyroid elderly. Design and Setting: A nationally representative population-based, cross-sectional study from the Korea National Health and Nutrition Examination Surveys. Participants: A total of 650 men aged $50 years and 533 postmenopausal women. Main Outcome Measures: HGS was measured using a digital grip strength dynamometer, and low muscle strength was defined based on the Korean specific cutoff point of HGS (28.9 and 16.8 kg in men and women, respectively). Results: After adjustment for confounders, lower serum TSH but not free T4 was associated with lower HGS in men (P = 0.032). Compared with men with high-normal TSH, those with low-normal TSH consistently showed 5.0% lower HGS (P = 0.027), with a linear decrease in HGS across decreasing serum TSH quartiles (P for trend = 0.018). Men with low muscle strength had 22.0% lower serum TSH than those without (P = 0.015), and the odds for the risk of low muscle strength was 3.76 times higher among men with low-normal TSH than it was among those with high-normal TSH (P = 0.021). However, these associations were not observed in postmenopausal women. Conclusions: These results suggest that serum TSH level at the lower end of reference range may be associated with low muscle strength, especially in older men.

Original languageEnglish (US)
Pages (from-to)3986-3992
Number of pages7
JournalJournal of Clinical Endocrinology and Metabolism
Volume103
Issue number11
DOIs
StatePublished - Jan 1 2018

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Independent Living
Muscle
Muscle Strength
Muscle Strength Dynamometer
Serum
Reference Values
Dynamometers
Nutrition
Nutrition Surveys
Muscle Weakness
Hand Strength
Hyperthyroidism
Korea
Health
Thyroid Gland
Cross-Sectional Studies
Outcome Assessment (Health Care)

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Endocrinology
  • Clinical Biochemistry
  • Biochemistry, medical

Cite this

Association of serum TSH with handgrip strength in community-dwelling euthyroid elderly. / Kim, Beom Jun; Lee, Seung Hun; Isales, Carlos M; Hamrick, Mark W; Kwak, Mi Kyung; Koh, Jung Min.

In: Journal of Clinical Endocrinology and Metabolism, Vol. 103, No. 11, 01.01.2018, p. 3986-3992.

Research output: Contribution to journalArticle

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abstract = "Context: Despite apparent muscle weakness in overt or even subclinical hyperthyroidism, the effects of thyroid function in the reference range on muscle strength are unknown. Objective: To investigate the association of serum TSH and free T4 with handgrip strength (HGS) in euthyroid elderly. Design and Setting: A nationally representative population-based, cross-sectional study from the Korea National Health and Nutrition Examination Surveys. Participants: A total of 650 men aged $50 years and 533 postmenopausal women. Main Outcome Measures: HGS was measured using a digital grip strength dynamometer, and low muscle strength was defined based on the Korean specific cutoff point of HGS (28.9 and 16.8 kg in men and women, respectively). Results: After adjustment for confounders, lower serum TSH but not free T4 was associated with lower HGS in men (P = 0.032). Compared with men with high-normal TSH, those with low-normal TSH consistently showed 5.0{\%} lower HGS (P = 0.027), with a linear decrease in HGS across decreasing serum TSH quartiles (P for trend = 0.018). Men with low muscle strength had 22.0{\%} lower serum TSH than those without (P = 0.015), and the odds for the risk of low muscle strength was 3.76 times higher among men with low-normal TSH than it was among those with high-normal TSH (P = 0.021). However, these associations were not observed in postmenopausal women. Conclusions: These results suggest that serum TSH level at the lower end of reference range may be associated with low muscle strength, especially in older men.",
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AU - Kwak, Mi Kyung

AU - Koh, Jung Min

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N2 - Context: Despite apparent muscle weakness in overt or even subclinical hyperthyroidism, the effects of thyroid function in the reference range on muscle strength are unknown. Objective: To investigate the association of serum TSH and free T4 with handgrip strength (HGS) in euthyroid elderly. Design and Setting: A nationally representative population-based, cross-sectional study from the Korea National Health and Nutrition Examination Surveys. Participants: A total of 650 men aged $50 years and 533 postmenopausal women. Main Outcome Measures: HGS was measured using a digital grip strength dynamometer, and low muscle strength was defined based on the Korean specific cutoff point of HGS (28.9 and 16.8 kg in men and women, respectively). Results: After adjustment for confounders, lower serum TSH but not free T4 was associated with lower HGS in men (P = 0.032). Compared with men with high-normal TSH, those with low-normal TSH consistently showed 5.0% lower HGS (P = 0.027), with a linear decrease in HGS across decreasing serum TSH quartiles (P for trend = 0.018). Men with low muscle strength had 22.0% lower serum TSH than those without (P = 0.015), and the odds for the risk of low muscle strength was 3.76 times higher among men with low-normal TSH than it was among those with high-normal TSH (P = 0.021). However, these associations were not observed in postmenopausal women. Conclusions: These results suggest that serum TSH level at the lower end of reference range may be associated with low muscle strength, especially in older men.

AB - Context: Despite apparent muscle weakness in overt or even subclinical hyperthyroidism, the effects of thyroid function in the reference range on muscle strength are unknown. Objective: To investigate the association of serum TSH and free T4 with handgrip strength (HGS) in euthyroid elderly. Design and Setting: A nationally representative population-based, cross-sectional study from the Korea National Health and Nutrition Examination Surveys. Participants: A total of 650 men aged $50 years and 533 postmenopausal women. Main Outcome Measures: HGS was measured using a digital grip strength dynamometer, and low muscle strength was defined based on the Korean specific cutoff point of HGS (28.9 and 16.8 kg in men and women, respectively). Results: After adjustment for confounders, lower serum TSH but not free T4 was associated with lower HGS in men (P = 0.032). Compared with men with high-normal TSH, those with low-normal TSH consistently showed 5.0% lower HGS (P = 0.027), with a linear decrease in HGS across decreasing serum TSH quartiles (P for trend = 0.018). Men with low muscle strength had 22.0% lower serum TSH than those without (P = 0.015), and the odds for the risk of low muscle strength was 3.76 times higher among men with low-normal TSH than it was among those with high-normal TSH (P = 0.021). However, these associations were not observed in postmenopausal women. Conclusions: These results suggest that serum TSH level at the lower end of reference range may be associated with low muscle strength, especially in older men.

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