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Table 2 Training program characteristics for aerobic, strength and aerobic + strength training interventions

From: Effects of ground and joint reaction force exercise on lumbar spine and femoral neck bone mineral density in postmenopausal women: a meta-analysis of randomized controlled trials

  Aerobic Strength Aerobic + Strength
Variable Groups (#) x ¯ ±SD Mdn Range Groups (#) x ¯ ±SD Mdn Range Groups (#) x ¯ ±SD Mdn Range
Length (weeks) 9 52 ± 22 52 24-104 14 46 ± 21 52 24-104 10 58 ± 29 52 24-104
Frequency (days/week) 8 3 ± 1 3 3-4 14 3 ± 1 3 3-6 9 3 ± 1 3 2-7
Intensity* 4 55 ± 14 59 36-68 6 63 ± 26 73 15-85 - - - -
Duration (min/sessions) 6 34 ± 12 38 10-30 - - - - - - - -
Minutes (per week) 6 103 ± 37 113 60-135 - - - - - - - -
Minutes (per week adjusted) 5 79 ± 33 71 48-113 - - - - - - - -
Sets (#) NA NA NA NA 12 3 ± 1 3 1-5 5 2 ± 0.4 2 2-3
Repetitions (#) NA NA NA NA 9 12 ± 8 10 8-30 - - - -
Rest between sets (sec.) NA NA NA NA 4 75 ± 57 90 0-120 - - - -
Exercises (#) NA NA NA NA 14 8 ± 4 9 1-12 5 8 ± 3 7 4-12
Compliance (%) 7 75 ± 16 80 39-84 10 83 ± 5 85 74-90 7 76 ± 11 77 59-95
  1. Groups (#), number of groups in which data were available; x ¯ ±SD, mean ± standard deviation; Mdn, Median; *, intensity expressed as a percentage of maximum oxygen consumption for aerobic groups and percentage of one-repetition maximum for strength training groups; -, insufficient data to calculate; NA, not applicable.