Sport Sciences Research Institute Studies in Sport Medicine 2322-1658 10 23 2018 08 23 The Effect of Whole Body Vibration on the Mechanical Properties of the Femur and Tibia in Ovariectomized Rats The Effect of Whole Body Vibration on the Mechanical Properties of the Femur and Tibia in Ovariectomized Rats 17 32 1145 10.22089/smj.2018.1145 FA Hoda Mozayani Assistant Professor of Sport Biomechanics, Shahid Beheshti University 0000-0003-3623-0783 Giti Torkaman Professor of Physiotherapy, Tarbiat Modares University Mehrdad Anbarian Professor of Sport Biomechanics, Bu-Ali Sina University 0000-0002-3605-5586 Ali Heydarian-pour Professor of Sport Physiology, Bu-Ali Sina University Journal Article 2016 04 04 The aim of this study was to determine the effect of whole-body vibration at a constant frequency and different amplitude in femur and tibia bones in ovariectomized rats. 23 ovariectomized rats divided into two exercise groups (n=9) and a SHAM group (n=5). Six healthy and non-surgical rats formed the control group. Rats in exercise and SHAM groups were placed on vibration platform for 8 weeks on the progressive time 2-5 minutes, 3-7 set and 1-minute inter-set rest time. Mechanical properties including stiffness, stress, and energy absorption and displacement percentage of the femoral and tibial were evaluated with three-point bending test after the period of the study. Stiffness index between training groups HA (P=0.024) and LA group (P=0.006) in femur and tibia compared with the sham group showed a significant increase. Stress index significantly increased between HA groups (P=0.000) and LA group (P=0.001) relative to the sham group in tibia. Energy absorb in just LA group (P=0.006) with the sham group showed a significant increase in tibia. Significantly increased control group compared to the sham was also observed in the indices (P=0.014, 0.000, 0.011) Our findings indicate a positive effect of whole-body vibration on the mechanical properties of the bone in both low and high amplitude conditions, but it was more effective in low-amplitude than high-amplitude condition. Also, whole-body vibration training is more effective to mechanical properties of tibia. Mechanical properties of bone in ovariectomized rats were close to control group level during whole body vibration. <br />  The aim of this study was to determine the effect of whole-body vibration at a constant frequency and different amplitude in femur and tibia bones in ovariectomized rats. 23 ovariectomized rats divided into two exercise groups (n=9) and a SHAM group (n=5). Six healthy and non-surgical rats formed the control group. Rats in exercise and SHAM groups were placed on vibration platform for 8 weeks on the progressive time 2-5 minutes, 3-7 set and 1-minute inter-set rest time. Mechanical properties including stiffness, stress, and energy absorption and displacement percentage of the femoral and tibial were evaluated with three-point bending test after the period of the study. Stiffness index between training groups HA (P=0.024) and LA group (P=0.006) in femur and tibia compared with the sham group showed a significant increase. Stress index significantly increased between HA groups (P=0.000) and LA group (P=0.001) relative to the sham group in tibia. Energy absorb in just LA group (P=0.006) with the sham group showed a significant increase in tibia. Significantly increased control group compared to the sham was also observed in the indices (P=0.014, 0.000, 0.011) Our findings indicate a positive effect of whole-body vibration on the mechanical properties of the bone in both low and high amplitude conditions, but it was more effective in low-amplitude than high-amplitude condition. Also, whole-body vibration training is more effective to mechanical properties of tibia. Mechanical properties of bone in ovariectomized rats were close to control group level during whole body vibration. <br />  https://smj.ssrc.ac.ir/article_1145_feab05aa91085b7a8012516bc3533958.pdf