| Summary: | 碩士 === 國立東華大學 === 體育與運動科學系 === 100 === The aim of this study was to investigate the effects of different exercises on the recovery of rats’ injured Achilles tendon. Methods: Seventy-two Spraque-Dawley (SD) male rats (eight weeks old and 200-250 g) were randomly assigned to four groups: control, walking 15-minute group (walking 15-mins group), walking 30-minute group (walking 30-mins group) and swimming 30-minute group (swimming 30-mins group). The rats’ Achilles tendon of right back limbs were cut first and then intervened by different exercises and amount after the 5th day of Achilles injury operation and exercised once for each day. The walking groups exercised at the speed of 4 meters/min for the first two days, and then the speed was increased to 12 meters/min, exercise 15 and 30 minutes each time. The swimming 30-minute group exercise 30 minutes each time. In addition, no exercise was performed in the control group. The functions of Achilles tendon (AFI) were evaluated at the 5 th, 12 th, 19 th, 28 th day post injury. All rats were sacrificed on the 28 th day. The morphology, the growth of collagen, ultimate tensile strength of tendon, relative cross-sectional area ultimate tensile strength and Achilles tendon’s diameter were measured. Statistical methods: Mixed Design two-way ANOVA was used to analyze AFI data. One Way ANOVA was used to analyze other parameters. Mean differences were determined via Tukey’s multiple comparison procedure and the significant level was set to p<0.05.
Results: AFI values: At the 12th day, the walking 30-mins group was significantly greater than the control and walking 15-mins groups (p=.026 and p=.034, respectively). At the 28th day, the walking 30-mins group was significantly greater than the control group (p=.042). Achilles tendon’s Diameters: The normal limbs were significantly smaller than the operated limbs in each group (p=.000). Compared to the control group, the operated limbs was significantly smaller in the walking 30-mins group (p=.000). Collagens: Collagens of groups with exercise were found to be ordered. The ultimate tensile strength of tendon: The operated limbs in the control group were significantly higher than the normal limbs in each group (p=.000); but, the significant difference were not found in the operated limbs among the four groups (p=.968). Relative cross-sectional area ultimate tensile strength: The normal limbs in the four groups were significantly higher than the operated limbs of the control group and swimming 30-mins groups (p=.036 and p=.001, respectively) ; however, all operated limbs in the four groups did not significantly differ (p=.937).
Conclusions: Walking can promote newly collagen arrangement more ordered and quality, make relative cross-sectional area ultimate tensile strength recover to normal. Increasing the walking exercise amount can promote adjustability of walking after injury. Hereafter, the functions of Achilles tendon will be recovered efficiently.
|
|---|
