Table 4 Daily physical activity levels of trained and untrained boys from 11 to 15 years of age. Values are means (±SD). |
|
Age Groups (n = 147) |
P value |
| 11 yr |
12 yr |
13 yr |
14 yr |
15 yr |
Age
Effect |
Training
Effect |
Age x
Training |
| T/U (n) |
15 / 15 |
15 / 15 |
14 / 14 |
14 / 15 |
15 / 15 |
| %HRR a, b |
T |
27.4 (1.9) |
25.9 (3.3) |
24.7 (2.0) |
26.6 (2.3) |
25.3 (2.5) |
.021 |
<.001 |
.535 |
| U |
24.5 (3.8) |
24.5 (2.4) |
23.2 (3.6) |
23.3 (3.3) |
22.1 (3.2) |
| Volume of Accumulated Activity |
| MPAb(min·day-1) |
T |
64.9 (14.0) |
58.4 (18.0) |
55.6 (17.2) |
54.8 (13.3) |
55.6 (17.4) |
.131 |
<.001 |
.747 |
| U |
39.8 (20.3) |
43.7 (15.0) |
35.9 (21.6) |
33.3 (13.9) |
30.6 (16.7) |
| VPA b(min·day-1) |
T |
31.8 (13.5) |
28.1 (13.5) |
28.7 (14.7) |
29.8 (14.3) |
26.2 (11.5) |
.365 |
<.001 |
.947 |
| U |
16.1 (11.1) |
12.4 (5.3) |
11.6 (8.7) |
9.9 (8.3) |
10.0 (7.8) |
| Duration of Maximum Sustained Bouts |
| MPA b(min·day-1) |
T |
5.5 (1.9) |
4.8 (1.7) |
4.7 (1.4) |
4.8 (1.7) |
5.0 (2.0) |
.645 |
<.001 |
.636 |
| U |
3.4 (1.2) |
3.8 (1.3) |
3.0 (1.3) |
3.4 (1.2) |
3.0 (1.5) |
| VPA b(min·day-1) |
T |
5.5 (2.1) |
5.7 (2.8) |
5.6 (2.4) |
6.0 (2.7) |
5.8 (2.3) |
.950 |
<.001 |
.935 |
| U |
3.1 (2.0) |
2.9 (1.6) |
2.3 (1.4) |
2.8 (1.6) |
2.9 (1.8) |
| Daily Number of Sustained Bouts |
| MPA a, b1st Duration |
T |
49.6 (11.9) |
50.8 (17.9) |
41.3 (14.5) |
45.2 (14.2) |
42.8 (12.8) |
.010 |
<.001 |
.677 |
| U |
42.1 (18.2) |
43.7 (10.6) |
35.1 (14.7) |
28.9 (12.4) |
31.4 (17.8) |
| MPA b2nd Duration |
T |
10.8 (2.8) |
9.6 (3.5) |
9.1 (2.6) |
8.9 (2.5) |
8.2 (2.7) |
.093 |
<.001 |
.688 |
| U |
6.6 (3.9) |
7.6 (3.0) |
5.5 (3.4) |
6.1 (2.8) |
5.5 (3.3) |
| MPA b3rd Duration |
T |
6.0 (2.4) |
5.0 (2.2) |
5.7 (2.5) |
5.2 (2.3) |
5.8 (3.1) |
.900 |
<.001 |
.623 |
| U |
3.0 (2.4) |
3.3 (1.8) |
3.1 (2.7) |
2.9 (1.9) |
2.2 (1.5) |
| VPA a, b1st Duration |
T |
14.2 (5.9) |
14.0 (7.3) |
11.8 (6.4) |
11.5 (4.2) |
11.2 (3.9) |
.008 |
<.001 |
.946 |
| U |
10.0 (5.5) |
9.0 (3.2) |
6.5 (3.5) |
5.2 (3.7) |
5.5 (5.6) |
| VPAb2nd Duration |
T |
3.7 (1.4) |
3.6 (2.0) |
3.6 (2.4) |
2.8 (1.7) |
2.6 (1.5) |
.073 |
<.001 |
.995 |
| U |
2.4 (2.2) |
2.2 (1.1) |
2.1 (1.9) |
1.4 (1.0) |
1.5 (1.6) |
| VPAb3rd Duration |
T |
4.0 (2.2) |
3.1 (1.5) |
3.6 (1.9) |
3.9 (1.6) |
3.1 (1.5) |
.469 |
<.001 |
.704 |
| U |
1.4 (1.2) |
1.2 (.8) |
1.1 (1.6) |
1.4 (1.3) |
1.3 (1.1) |
|
T = trained; U = untrained; %HRR = percentage of heart rate reserve; MPA = moderate physical activity; VPA = vigorous physical activity |
"a" denotes significant age effect |
"b" denotes significant training effect. |
|