TABLE 3.
Multivariate linear regression analysis of the associations of anthropometrical characteristics and Δirisin levels.
| Variable |
Crude model |
Model I |
Model II |
|||
| β (95%CI) | P-value | β (95%CI) | P-value | β (95%CI) | P-value | |
| BMR | −0.01 (−0.04, 0.03) | 0.7441 | −0.01 (−0.07, 0.05) | 0.7113 | −0.00 (−0.07, 0.07) | 0.9095 |
| BMI | −2.34 (−4.69, 0.02) | 0.0555 | −2.60 (−5.06, -0.15) | 0.0412* | −2.75 (−5.47, −0.03) | 0.0515 |
| FM | −1.15 (−2.34, 0.04) | 0.0627 | −1.21 (−2.42, 0.00) | 0.0539 | −1.30 (−2.63, 0.03) | 0.0602 |
| FM% | −0.85 (−1.94, 0.24) | 0.1319 | −1.33 (−2.64, −0.01) | 0.0514 | −1.49 (−2.93, −0.05) | 0.0462* |
| VFA | −0.18 (−0.40, 0.05) | 0.1314 | −0.19 (−0.43, 0.04) | 0.1126 | −0.20 (−0.45, 0.06) | 0.1378 |
| WHR | −44.80 (−168.75, 79.15) | 0.4808 | −43.80 (−175.62, 88.02) | 0.5169 | −38.75 (−181.91, 104.41) | 0.5974 |
| FFM | −0.13 (−0.93, 0.66) | 0.7430 | −0.26 (−1.60, 1.09) | 0.7101 | −0.09 (−1.59, 1.42) | 0.9091 |
| FFMI | −1.58 (−5.29, 2.13) | 0.4058 | −3.06 (−8.37, 2.24) | 0.2615 | −2.85 (−8.71, 3.01) | 0.3440 |
| SLM | −0.14 (−0.98, 0.70) | 0.7465 | −0.27 (−1.70, 1.16) | 0.7154 | −0.08 (−1.69, 1.52) | 0.9193 |
| SMM | −0.18 (−1.36, 1.00) | 0.7693 | −0.22 (−1.87, 1.43) | 0.7949 | 0.09 (−1.72, 1.90) | 0.9258 |
| SMMI | −1.45 (−6.09, 3.20) | 0.5429 | −1.86 (−7.41, 3.70) | 0.5147 | −1.02 (−7.08, 5.04) | 0.7428 |
| LTF | 6.42 (−1.40, 14.24) | 0.1118 | 8.75 (−0.16, 17.66) | 0.0580 | 10.27 (0.34, 20.19) | 0.0464* |
| SVR | 39.35 (−16.75, 95.45) | 0.1731 | 52.25 (−11.22, 115.72) | 0.1107 | 61.48 (−7.77, 130.73) | 0.0863 |
| Inbody score | 0.64 (−0.51, 1.78) | 0.2792 | 0.62 (−0.59, 1.84) | 0.3192 | 0.75 (−0.58, 2.08) | 0.2739 |
Abbreviations: Δirisin, the circulating irisin changes responses to ice swimming; Crude, no adjustment; Model I, adjusted for age and gender; Model II, adjusted for age, gender age, gender, smoke, alcohol drinking, diabetes, distance swum per session, the frequency of ice swimming every week, and the total years of ice swimming; β, regression coefficient; CI, confidence interval; BMR, basal metabolic rate; BMI, body mass index; FM, fat mass; FM%, percent body fat; VFA, visceral fat area; WHR, waist to hip ratio; FFM, fat free mass; FFMI, fat free mass index; SLM, soft lean mass; SMM, skeletal muscle mass; SMMI, skeletal muscle mass index; LTF, lean-to-fat ratio; and SVR, skeletal muscle mass to visceral fat area ratio. *P < 0.05.