Evaluation of Muscle Function Using Integrated EMG and Power Spectrum during Aerobic Exercise
【Supercategory：7. DESCENTE SPORTS SCIENCE Subcategory：7.9 Vol.9】
In aerobic dance programs, main dance period is the most important for increasing aerobic power. But, it is though that this period involves some risk of injuries of musculoskeletal systems.
In this study, muscle function were investigated using surface electromiogram (EMG), in which mean power frequency (MPF) and integrated EMG (IEMG) were analyzed, during aerobic dance, especially in running.
Six female subjects, two professional instructors and four beginners, performed trial bouts for four times, before running and ten, twenty and twenty five minutes after running respectively, at maximum voluntary isometric contraction for ten seconds. EMG were recorded in the quadriceps, medial hamstring, anterior tibial muscle and triceps surae muscles.
Generally muscle fatigue is defined as (1) a decrease in muscle force, (2) an increase in EMG activity under standardized load and (3) a shift of power spectrum toward lower frequency.
Muscle fatigue, determined by a simultaneous shift of MPF toward lower frequency with an increase in IEMG, were observed in the beginner with a poor muscle strength measured before running.
DESCENTE SPORTS SCIENCE Vol.9/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
In this study, muscle function were investigated using surface electromiogram (EMG), in which mean power frequency (MPF) and integrated EMG (IEMG) were analyzed, during aerobic dance, especially in running.
Six female subjects, two professional instructors and four beginners, performed trial bouts for four times, before running and ten, twenty and twenty five minutes after running respectively, at maximum voluntary isometric contraction for ten seconds. EMG were recorded in the quadriceps, medial hamstring, anterior tibial muscle and triceps surae muscles.
Generally muscle fatigue is defined as (1) a decrease in muscle force, (2) an increase in EMG activity under standardized load and (3) a shift of power spectrum toward lower frequency.
Muscle fatigue, determined by a simultaneous shift of MPF toward lower frequency with an increase in IEMG, were observed in the beginner with a poor muscle strength measured before running.
DESCENTE SPORTS SCIENCE Vol.9/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
| Researcher | Mamoru Okubo*1, Michiyuki Nishiura*1, Kenji Ueno*1, Gen Yoshida*1, Takashi Tsuji*1, Nobuyasu Ichikawa*2 |
|---|---|
| University or institution | *1 Osaka City Univ. Med. School Department of Orthopaedic Surgery, *2 Osaka College of Physical Education, Department of Sports Medicine |
Keywords
aerobic dance, aerobic power, muscle function, surface electromiogram