title: Effects of detraining on motor unit potential area, muscle function and physical performance based on CNTF gene polymorphism.
abstract: OBJECTIVE
  The purpose of this study was to identify the effect of detraining on motor unit potential area (SMUP), muscular function and physical performance, according to CNTF gene polymorphism.
  
  
  METHODS
  For this study, GG (normal homozygote, n = 8) group and GA + AA (mutation heterozygote and homozygote, n = 10) group were divided by CNTF gene polymorphism and both groups were performed detraining for 4 weeks. The data was analyzed by two-way repeated measures ANOVA for verifying the differences between two groups and interaction using SPSS (ver. 20.0) statistical program.
  
  
  RESULTS
  The results were as follows. First, changes in body composition were measured but there was no significant interaction effect between time and group. Seconds, changes in SMUP were measured by SEMG. Interaction effect between time and group was found lateral vastus during isokinetic exercise of 180°/sec (p < .05). Third, changes in isokinetic muscle strength of 60°/sec and 180°/sec were measured but there was no significant interaction effect. Fourth, significant statistical differences were not showed changes of sports performance after detraining.
  
  
  CONCLUSIONS
  In conclusion, there were no significantly differences between GG and GA + AA group after detraining, therefore, further study will be considered a matter in various its interventions such as serum levels of CNTF and changes in receptors and muscle fiber types.
authors.affiliation: Department of Physical Education, College of Education, Dongguk University, 30, Pildong-ro-1-gil, Jung-gu, Seoul, 100-715, Republic of Korea.
authors.forename: Sang Min
authors.initials: SM
authors.lastname: Hong
authors.affiliation: Department of Prescription & Rehabilitation of Exercise, College of Physical Exercise, and Department of kinesiology medical science, graduate, Dankook University, San 29, Anseo-dong, Cheonan-si, Chungnam 330-714, Republic of Korea.
authors.forename: Ae Rim
authors.initials: AR
authors.lastname: Hong
authors.affiliation: Department of Prescription & Rehabilitation of Exercise, College of Physical Exercise, and Department of kinesiology medical science, graduate, Dankook University, San 29, Anseo-dong, Cheonan-si, Chungnam 330-714, Republic of Korea.
authors.forename: Yun A
authors.initials: YA
authors.lastname: Shin
keywords: CNTF gene polymorphism; detraining; motor unit potential area; muscular function; physical fitness