Table 2

Training program characteristics for aerobic, strength and aerobic + strength training
interventions 

Aerobic 
Strength 
Aerobic + Strength 
Variable 
Groups (#) 
±SD 
Mdn 
Range 
Groups (#) 
±SD 
Mdn 
Range 
Groups (#) 
±SD 
Mdn 
Range 
Length (weeks) 
9 
52 ± 22 
52 
24104 
14 
46 ± 21 
52 
24104 
10 
58 ± 29 
52 
24104 
Frequency (days/week) 
8 
3 ± 1 
3 
34 
14 
3 ± 1 
3 
36 
9 
3 ± 1 
3 
27 
Intensity* 
4 
55 ± 14 
59 
3668 
6 
63 ± 26 
73 
1585 
 
 
 
 
Duration (min/sessions) 
6 
34 ± 12 
38 
1030 
 
 
 
 
 
 
 
 
Minutes (per week) 
6 
103 ± 37 
113 
60135 
 
 
 
 
 
 
 
 
Minutes (per week adjusted) 
5 
79 ± 33 
71 
48113 
 
 
 
 
 
 
 
 
Sets (#) 
NA 
NA 
NA 
NA 
12 
3 ± 1 
3 
15 
5 
2 ± 0.4 
2 
23 
Repetitions (#) 
NA 
NA 
NA 
NA 
9 
12 ± 8 
10 
830 
 
 
 
 
Rest between sets (sec.) 
NA 
NA 
NA 
NA 
4 
75 ± 57 
90 
0120 
 
 
 
 
Exercises (#) 
NA 
NA 
NA 
NA 
14 
8 ± 4 
9 
112 
5 
8 ± 3 
7 
412 
Compliance (%) 
7 
75 ± 16 
80 
3984 
10 
83 ± 5 
85 
7490 
7 
76 ± 11 
77 
5995 
Groups (#), number of groups in which data were available;
±SD, mean ± standard deviation; Mdn, Median; *, intensity expressed as a percentage
of maximum oxygen consumption for aerobic groups and percentage of onerepetition
maximum for strength training groups; , insufficient data to calculate; NA, not applicable.
Kelley et al.
Kelley et al. BMC Musculoskeletal Disorders 2012 13:177 doi:10.1186/1471247413177