Sex-related differences and cross-sectional age-related changes to the cross-sectional area of the psoas major muscles corrected for fat-free mass
- VernacularTitle:大腰筋断面積（FFM補正）の性差と横断的年齢変化
- Author:
Nozomi OHTA
1
;
Tomomi IIDA
1
;
Yoshihiro HOSHIKAWA
2
;
Yohei TAKATA
1
;
Yoshiharu NAKAJIMA
1
;
Tsuyoshi KOSUGI
1
Author Information
- Keywords: cross-sectional area of psoas major muscle; fat-free mass corrected; sex-related differences; age-related changes
- From:Japanese Journal of Physical Fitness and Sports Medicine 2021;70(1):125-132
- CountryJapan
- Language:Japanese
- Abstract: In the present study, we examined the sex-related differences and cross-sectional age-related changes in the cross-sectional area of the psoas major muscle. The cross-sectional area was corrected for fat-free mass (FFM-corrected), which was calculated as the 2/3rd power of the total fat-free mass. A total of 240 adults (114 men, 126 women, age: 20-81 years) were included in the study. The cross-sectional area of the psoas major muscle was measured by 0.2T magnetic resonance imaging (MRI), and the total fat-free mass was measured by air displacement plethysmography. We demonstrated that the FFM-corrected cross-sectional area of the psoas major muscle was greater in males than females across all age groups. Furthermore, we examined the mean FFM-corrected cross-sectional area of the psoas major muscle across different age groups and demonstrated that it decreased with age. Our findings, when combined with previous results, show a peak in the 20s, which declined with age. Our study revealed sex-related differences and cross-sectional age-related changes in the FFM-corrected cross-sectional area of the psoas major muscle. Our findings also suggest that it is important to define reference values and ranges that take into account age- and sex-related differences when assessing the psoas major muscle by FFM-corrected cross-sectional area.
