Table 2.
Characteristics at 91-mo Follow-Up
|
Intervention groups |
||||||
|
Jumpers (n = 29) |
Controls (n = 20) |
|||||
| Male (n = 18) | Female (n = 11) | Total (n = 29) | Male (n = 13) | Female (n = 7) | Total (n = 20) | |
| Race (W/A/B/MR) | 17/1/0/0 | 10/1/0/0 | 27/2/0/0 | 13/0/0/0 | 7/0/0/0 | 20/0/0/0 |
| Age (yr) | 15.0 (1.3) | 15.5 (1.4) | 15.2 (1.3) | 15.3 (1.4) | 15.8 (0.9) | 15.5 (1.2) |
| Maturity (pre/post PHV) | 4/14 | 0/11 | 4/25 | 2/11 | 0/7 | 2/18 |
| Height (cm) | 170.8 (8.9)† | 162.8 (5.4)† | 167.8 (8.6)‡ | 173.4 (8.4)† | 169.5 (3.0)† | 172.0 (7.1)‡ |
| Weight (kg) | 65.3 (15.1) | 58.2 (9.4) | 62.6 (13.5) | 63.1 (11.5) | 61.8 (16.8) | 62.7 (13.2) |
| Relative fat mass (%)* | 20.4 (9.2)§ | 29.8 (7.8)§ | 23.7 (9.7) | 16.5 (7.6)§ | 29.5 (8.5)§ | 21.0 (10.0) |
| Bone variables | ||||||
| Total hip BMC | 39.93 (9.56)¶ | 31.26 (5.40)¶ | 36.84 (9.22) | 39.31 (9.93)¶ | 30.15 (3.38)¶ | 36.1 (9.27) |
| Femoral neck BMC | 4.92 (0.88)¶ | 4.18 (0.53)¶ | 4.66 (0.81) | 4.73 (0.93)¶ | 4.21 (0.69)¶ | 4.55 (0.87) |
| Trochanter BMC | 11.11 (2.62)¶ | 8.31 (1.42)¶ | 10.1 (2.62) | 10.91 (2.54)¶ | 7.49 (1.05)¶ | 9.72 (2.69) |
| Total calcium (mg) | 1099 (510) | 989 (376) | 1057 (459) | 1329 (441) | 1194 (382) | 1282 (416) |
| Vitamin D (IU) | 254 (132) | 290 (215) | 267 (165) | 402 (197) | 276 (109) | 358 (179) |
| Team sports | ||||||
| [(n) %] reporting none | (5) 27.8 | (4) 36.4 | (9) 31.0 | (4) 30.8 | (2) 28.6 | (6) 30.0 |
| [(n) %] reporting ≥1 | (13) 72.2 | (7) 63.6 | (20) 69.0 | (9) 69.2 | (5) 71.4 | (14) 70.0 |
Values presented as mean (SD).
* Percent body fat determined from whole body DXA scans.
† Males greater than females, p < 0.05.
‡ Controls greater than jumpers, p < 0.05.
§ Females greater than males, p < 0.001.
¶ Males greater than females p < 0.01.
W, white; A, Asian; B, black; MR, mixed race.