Table 1 Characteristics of study participants at baseline and follow-up

Age (yrs)

25.5

(0.2)

36.5

(0.8)

Knee muscle strength

 Extensors, absolute (Nm)

141.8

(27)

131.6

(26.5)

 Extensors, weight-adjusted (%)

221.9

(36.7)

192.8

(36.6)

 Flexors, absolute (Nm)

71.9

(15.6)

67.8

(16)

 Flexors, weight-adjusted (%)

112.6

(22)

99.3

(22.4)

 Hamstrings-to-quadriceps ratio

0.51

(0.08)

0.52

(0.09)

Body composition

 Weight (kg)

64.7

(11.4)

69.3

(13.2)

 BMI ((kg/m²)

23

(3.8)

24.6

(4.5)

 FMI (total body fat mass (kg)/height (m)²

7.6

(3)

8.5

(3.4)

 Fat Mass-total body (%)

31.5

(0.07)

33.7

(0.07)

 Lean Mass-total body (%)

63.3

(0.07)

62.4

(0.07)

 Lean Mass-legs (%)

21

(0.03)

20.9

(0.02)

High physical activity level, n (%)

826

(78)

371

(46)

Low physical activity level, n (%)

228

(22)

427

(54)

Knee injury, n (%)

342

(32)

120

(15)