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KMID : 0811720020060000157
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Korean Journal of Physiology & Pharmacology
2002 Volume.6 No. 0 p.157 ~ p.0
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The Relationship between Resting Periods, Exercise Mode and Training Load on Bone Robustness of Male Rats
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Gama
Kim Dong-Chul
Park Byung-Rim
Shchegel Olena
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Abstract
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The aim of this on-going study is to compare the effect of resting periods on two exercise programs of endurance training of equal duration and intensity on bone development in male rats. Healthy male Sprague-Dawley rats were randomly assigned to one of the three groups: run-trained (TM, n=8), swim-trained (SE, n=8) and control (CON, n=8). Training sessions were 1 h/day, followed by 24 hrs resting period for 3 days a week and 48 hrs at the end of each week on the basis of (E R E R E RR) training protocol. The TM group ran at a speed of 27 m/min up an 8 degree inclination, SE animals swam with 2% of body weight attached to their tails. Bone weight, length, diameter, ponderal index and bone mineral contents (BMC) were measured in the femur and humerus of each animal. Adrenal gland data indicated that the training response between TM and SE groups was identical. The humerus and femur of the SE group were significantly heavier (p＜0.05), wider and had greater BMC when compared with those of TM or CON rats. In addition to the difference in the mechanical recruitment patterns of upper and lower body that could be responsible for bone development patterns, our study suggest that resting periods after exercise bouts were involved in improving bone adaptation and robustness produce by swim-trained protocol. Additional studies using shorter resting periods are required to validate the effect on non-weight bearing exercise. (Supported by Vestibulocochlear Research Center from KOSEF)
Source: Korean Journal of Physiology & Pharmacology.2002 Oct;6(Suppl II):S108-S108
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KEYWORD
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bone robustness, exercise mode, resting period, rat
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