:: Volume 20, Issue 2 (Bimonthly 2016) ::
Feyz 2016, 20(2): 108-117 Back to browse issues page
Impact of a 12 week resistance and concurrent training on bone mechanical strength and mineral density of osteoporotic male Wistar rats
Farzad Nazem, Abbas Salehikia *, Seyyed Mohammad Marandi, Ahmad Sahdadi
Department of Sport Sciences, Faculty of Education and Psychology, University of Sistan and Baluchestan, Zahedan, I. R. Iran. , salehikia@ped.usb.ac.ir
Abstract:   (4395 Views)

Background: This study evaluated the efficacy of concurrent training compared to resistance training on femoral bone mineral density (BMD) and mechanical strength of osteoporotic male rats.

Materials and Methods: Eight out of 40 male Wistar rats were separated as healthy subjects. Then osteoporosis was induced in the remaining rats by the injection of ethanol (20%, i.p) for 3 weeks. Osteoporotic rats divided into 4 groups: Baseline, Resistance training, Concurrent training and Control. The resistance training protocol consisted of 8 series of climbs on a 110-cm vertical ladder angled at 80º with weights tied to the animal tail. The overload for first and eighth series was set at 50% and 100% of the total body mass of the animal, respectively. Concurrent group completed a combination of both resistance and endurance treadmill trainings (60 min/day, speed: 12 m/min). The left excised femur of the animals were scanned for BMD measurement and examined by three point bending test to obtain the maximum force and stiffness.

Result: Two Resistance training and Concurrent training groups had significantly increased maximum force, stiffness and BMD compared to Control group (P=0.019). Compared to resistance group, the Concurrent group showed a positive effect on bone mechanical strength (P=0.039) with no significance difference in BMD (P=0.890).

Conclusion: The results of this study shows that the combination of resistance and endurance exercise may have a synergistic effect on increasing the mechanical strength of osteoporotic femoral bone in male rats compared to resistance training alone.

Keywords: Bone density, Mechanical properties, Osteoporosis, Resistance training, Concurrent training, Animal model
Full-Text [PDF 236 kb]   (1636 Downloads)    
Type of Study: Research | Subject: medicine, paraclinic
Received: 2016/06/19 | Revised: 2017/08/1 | Accepted: 2016/06/19 | Published: 2016/06/19
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