BMJ Open (Feb 2024)

Association between animal protein intake, oral frailty and calf circumference in middle-aged and older adults: a cross-sectional analysis from the Shika study

  • Toshinari Takamura,
  • Keita Suzuki,
  • Hiroyuki Nakamura,
  • Akinori Hara,
  • Atsushi Tajima,
  • Fumihiko Suzuki,
  • Hirohito Tsuboi,
  • Shigefumi Okamoto,
  • Shingo Nakai,
  • Sakae Miyagi,
  • Hiromasa Tsujiguchi,
  • Thao Thi Thu Nguyen,
  • Yukari Shimizu,
  • Koichiro Hayashi,
  • Tomoko Kasahara,
  • Masaharu Nakamura,
  • Chie Takazawa,
  • Aya Ogawa,
  • Aki Shibata,
  • Takayuki Kannon,
  • Noriyoshi Ogino,
  • Tadashi Konoshita,
  • Kuniko Sato

DOI
https://doi.org/10.1136/bmjopen-2023-078129
Journal volume & issue
Vol. 14, no. 2

Abstract

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Objective To investigate the relationship between oral frailty (OF), nutrient intake and calf circumference (CC) in middle-aged and older adults.Design Cross-sectional study.Setting Residents of four model districts of Shika town, Ishikawa Prefecture, Japan, using data from November 2017 to February 2018.Participants One hundred and ninety-four residents aged ≥50 years in four model districts of Shika town. The OF total score ≥3 was defined as OF. Participants were divided into OF and non-OF groups and divided into the low-CC/kg and the high-CC/kg groups.Outcome measures The primary outcome is to use a two-way analysis of covariance to analyse the interaction between the two CC/kg groups and the two OF groups on nutrition intake. The secondary outcome is to use multiple regression analysis to investigate the nutrients significantly related to CC/kg when stratified by OF, with age, sex, body mass index, drinking status, smoking status and regular exercise as input covariates.Results A two-way analysis of covariance revealed a significant interaction between the two CC/kg groups and the two OF groups on animal protein intake (p=0.039). Multiple comparisons using the Bonferroni analysis revealed a significantly lower animal protein intake in the OF group than in the non-OF group with a low CC/kg (p=0.033) but not in the group with a high CC/kg. The multiple regression analysis stratified by OF revealed a positive correlation between animal protein intake and CC/kg (p=0.002).Conclusions The present results revealed a significantly lower animal protein intake in the OF group than in the non-OF group in the low-CC/kg group, but no such difference was observed in the high-CC/kg group. Further longitudinal studies are needed to elucidate this relationship.