Hartard et al. (A-50) conducted a study to determine whether a certain training regimen can counteract bone density loss in women with postmenopausal osteopenia. The following are strength measurements for five muscle groups taken on 15 subjects before (B) and after (A) 6 months of training:

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Leg Press Hip Flexor Hip Extensor Subject (B) (A) (B) (A) (B) (A) 11 12 13 15 -234567890=2RAS 1 100 180 8 15 155 195 10 20 115 150 8 13 130 170 10 14 120 150 7 12 60 140 5 12 222228 10 20 12 25 12 19 12 20 12 15 16 60 100 4 6 6 9 140 215 12 18 14 24 110 150 10 13 12 19 10 95 120 6 8 8 14 110 130 10 12 10 14 150 220 10 13 15 29 120 140 9 20 14 100 150 9 10 15 110 130 6 9 458 14 25 29 12