The effect of different intensities of active recovery on muscle function and running economy after exercise-induced muscle damage

• Main Authors: Chia-Ching Wu, 吳家慶
• Other Authors: Sandy Shen-Yu Hsieh
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/96250424916946063738

博士 === 國立臺灣師範大學 === 體育學系 === 93 === The effect of the different intensities of active recovery on muscle function and running economy after exercise-induced muscle damage June 2005 Student：Chia-Ching Wu Advisor：Sandy Shen-Yu Hsieh ABSTRACT Background：Should athlete continue to exercise when muscles are sored after strenuous exercise？ Current literatures do not provide clear answers to this question. Post studies discussed the effect of exercise on muscle function after exercise-induced muscle damage. However, muscle function is not the only concern for endurance runners. Running economy should also be considered. Purpose：To determine the effect of a 6-day different intensities active recovery (50%、60%、70% VO2max) on muscle function and running economy after exercise-induced muscle damage. Methods：Forty Physical Education students (32 males & 8 females) took the VO2max and running economy test first. Then they were randomly assigned into 4 groups: E50（50% VO2max；n=10；♂＝8、♀=2）, E60（60% VO2max；n=10；♂＝8、♀=2）, E70（70% VO2max；n=10；♂＝8、♀=2） and CON（control；n=10；♂＝8、♀=2）. A 30-min downhill running (-15%) at 70% VO2max was used to cause muscle damage. A 30-min active recovery running exercise was performed everyday for the following 6 days. Maximal isometric voluntary contraction strength (MVC) and muscle soreness were measured before, immediately after and 1, 2, 3, 4, 5, 6, 7 days after downhill running. Creatine kinase (CK) and lactate dehydrogenase (LDH) activities were also tested before, immediately after and 1, 3, 5, 7 days after downhill running. Running economy was determined 2, 5, 7 days after downhill running. Results：On the days 4 –7, both the CON’s and E50’s MVC were significantly higher than the E70 (p<.05). On the seventh day of the running economy test after downhill running, E50 was significantly different as compared to CON and E70（p<.05）. No significant differences among groups in CK activity, LDH activity and muscle soreness (p>.05) were observed. Conclusions：1. Rest or moderate intensity active recovery (about 50% VO2max) is better for MVC recovery. Higher intensity of active recovery, will delay the normal course of MVC recovery. 2. Higher intensity of active recovery or rest was harmful to running economy. 3. When consider running economy and MVC together, moderate intensity of active recovery (about 50% VO2max) was better than rest or high intensity active recovery. Key words：active recovery, muscle damage, running economy.