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Titolo:
Effect of exercise intensity on bone density, strength, and calcium turnover in older women
Autore:
Humphries, B; Newton, RU; Bronks, R; Marshall, S; McBride, J; Triplett-McBride, T; Hakkinen, K; Kraemer, WJ; Humphries, N;
Indirizzi:
Univ Cent Queensland, Sch Hlth & Human Performance, Rockhampton, Qld 4702,Australia Univ Cent Queensland Rockhampton Qld Australia 4702 n, Qld 4702,Australia So Cross Univ, Sch Exercise Sci & Sport Management, Lismore, Australia So Cross Univ Lismore Australia & Sport Management, Lismore, Australia Univ Jyvaskyla, Dept Biol Phys Activ, SF-40100 Jyvaskyla, Finland Univ Jyvaskyla Jyvaskyla Finland SF-40100 v, SF-40100 Jyvaskyla, Finland Ball State Univ, Human Performance Lab, Muncie, IN 47306 USA Ball State Univ Muncie IN USA 47306 Performance Lab, Muncie, IN 47306 USA
Titolo Testata:
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
fascicolo: 6, volume: 32, anno: 2000,
pagine: 1043 - 1050
SICI:
0195-9131(200006)32:6<1043:EOEIOB>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
HORMONE REPLACEMENT THERAPY; WEIGHT-BEARING EXERCISE; PYRIDINIUM CROSS-LINKS; MINERAL DENSITY; POSTMENOPAUSAL WOMEN; CONTROLLED TRIAL; MUSCLE STRENGTH; PREMENOPAUSAL WOMEN; SERUM OSTEOCALCIN; URINARY-EXCRETION;
Keywords:
BMD; weight training; aging; muscular strength;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Humphries, B Univ Cent Queensland, Sch Hlth & Human Performance, Rockhampton, Qld 4702,Australia Univ Cent Queensland Rockhampton Qld Australia 4702ustralia
Citazione:
B. Humphries et al., "Effect of exercise intensity on bone density, strength, and calcium turnover in older women", MED SCI SPT, 32(6), 2000, pp. 1043-1050

Abstract

Purpose: This study examined the effects of 24 wk of high intensity strength training or low intensity walking on lumbar bone mineral density (BMD), muscular strength, and calcium turnover in Australian women either taking hormone replacement therapy (HRT) or not taking HRT. Methods: A subject poolof 64 women between 45-65 yr and randomly allocated into weights (N = 21),walking (N = 20), weightsHRT (N = 14), and walkingHRT (N = 9) groups completed this study. All subjects trained twice weekly in either a 50-min walking or weight-training program (60-90% 1RM). Measurements included maximal isometric knee strength, 1RM bench press, 1RM squat, isokinetic back strength, lumbar (L2-L4) BMD, serum osteocalcin, and urinary deoxypyridinoline crosslinks (Dpd). Results: No significant group differences in BMD were evident at the completion of training. However, a significant (P < 0.05) within group change was apparent for the walking group since BMD decreased 1.3% below baseline testing. Osteocalcin levels increased significantly (P < 0.05) in the walking (22%) group. Maximal bench press and squat strength improvedsignificantly (P < 0.05) in the weights (25.8% and 37.7%) and weightsHRT (25.4% and 35.7%) groups. The weights group also increased significantly (P < 0.05) in isokinetic back strength (22.2%). Conclusion: It was concluded that short-term high intensity resistance training provides an effective means for increasing muscular strength in women between 45 and 65 yr. The training effects on lumbar BMD were not apparent in the present study.

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Documento generato il 16/07/20 alle ore 04:38:04