TY - JOUR
T1 - Vitamin K Status and Lower Extremity Function in Older Adults
T2 - The Health Aging and Body Composition Study
AU - Shea, M. Kyla
AU - Loeser, Richard F.
AU - Hsu, Fang Chi
AU - Booth, Sarah L.
AU - Nevitt, Michael
AU - Simonsick, Eleanor M.
AU - Strotmeyer, Elsa S.
AU - Vermeer, Cees
AU - Kritchevsky, Stephen B.
N1 - Publisher Copyright:
© 2015 The Author 2015.
PY - 2016/10/1
Y1 - 2016/10/1
N2 - Background: While low vitamin K status has been associated with several chronic diseases that can lead to lower extremity disability, it is not known if low vitamin K status is associated with worse lower extremity function. Methods: Vitamin K status was measured according to plasma phylloquinone (vitamin K1) and dephosphorylated-uncarboxylated MGP (dp-ucMGP) in 1,089 community-dwelling older adults (mean ± SD age =74±3 years; 67% female). Lower extremity function was assessed using the short physical performance battery (SPPB), gait speed, and isokinetic leg strength. Linear regression and mixed models were used to determine the cross-sectional and longitudinal associations between vitamin K status and functional outcome measures. Results: Cross-sectionally, higher plasma phylloquinone was associated with better SPPB scores and 20-m gait speed (p ≤. 05). After 4-5 years, those with ≥1.0nM plasma phylloquinone (the concentration achieved when recommended intakes are met) had better SPPB scores (p =. 03) and 20-m gait speed (p <. 05). Lower plasma dp-ucMGP (reflective of better vitamin K status) was associated with better SPPB scores and leg strength cross-sectionally (p ≤. 04), but not longitudinally. Neither measure of vitamin K status was associated with walking endurance or with the rate of decline in function. Conclusion: Older adults with higher vitamin K status had better physical performance scores at baseline, but data are less consistent longitudinally. Since lower extremity disability is a common consequence of multiple chronic diseases for which a role of vitamin K has been suggested, future studies are needed to determine if vitamin K supplementation could improve function in those with vitamin K insufficiency and clarify underlying mechanism(s).
AB - Background: While low vitamin K status has been associated with several chronic diseases that can lead to lower extremity disability, it is not known if low vitamin K status is associated with worse lower extremity function. Methods: Vitamin K status was measured according to plasma phylloquinone (vitamin K1) and dephosphorylated-uncarboxylated MGP (dp-ucMGP) in 1,089 community-dwelling older adults (mean ± SD age =74±3 years; 67% female). Lower extremity function was assessed using the short physical performance battery (SPPB), gait speed, and isokinetic leg strength. Linear regression and mixed models were used to determine the cross-sectional and longitudinal associations between vitamin K status and functional outcome measures. Results: Cross-sectionally, higher plasma phylloquinone was associated with better SPPB scores and 20-m gait speed (p ≤. 05). After 4-5 years, those with ≥1.0nM plasma phylloquinone (the concentration achieved when recommended intakes are met) had better SPPB scores (p =. 03) and 20-m gait speed (p <. 05). Lower plasma dp-ucMGP (reflective of better vitamin K status) was associated with better SPPB scores and leg strength cross-sectionally (p ≤. 04), but not longitudinally. Neither measure of vitamin K status was associated with walking endurance or with the rate of decline in function. Conclusion: Older adults with higher vitamin K status had better physical performance scores at baseline, but data are less consistent longitudinally. Since lower extremity disability is a common consequence of multiple chronic diseases for which a role of vitamin K has been suggested, future studies are needed to determine if vitamin K supplementation could improve function in those with vitamin K insufficiency and clarify underlying mechanism(s).
KW - Nutrition
KW - Physical function
KW - Physical performance
KW - Vitamin K
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U2 - 10.1093/gerona/glv209
DO - 10.1093/gerona/glv209
M3 - Article
C2 - 26576842
AN - SCOPUS:84991073162
SN - 1079-5006
VL - 71
SP - 1348
EP - 1355
JO - Journals of Gerontology - Series A Biological Sciences and Medical Sciences
JF - Journals of Gerontology - Series A Biological Sciences and Medical Sciences
IS - 10
ER -