Paper Information

Journal:   FEYZ   JUNE 2016 , Volume 20 , Number 2 #A0029; Page(s) 108 To 117.
 
Paper: 

IMPACT OF A 12 WEEK RESISTANCE AND CONCURRENT TRAINING ON BONE MECHANICAL STRENGTH AND MINERAL DENSITY OF OSTEOPOROTIC MALE WISTAR RATS

 
 
Author(s):  NAZEM F., SALEHIKIA A.*, MARANDI S.M., SHAHDADI A.
 
* DEPARTMENT OF SPORT SCIENCES, FACULTY OF EDUCATION AND PSYCHOLOGY, UNIVERSITY OF SISTAN AND BALUCHESTAN, ZAHEDAN, I.R. IRAN
 
Abstract: 

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 80
° 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.

 
Keyword(s): BONE DENSITY, MECHANICAL PROPERTIES, OSTEOPOROSIS, RESISTANCE TRAINING, CONCURRENT TRAINING, ANIMAL MODEL
 
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