EMG and Muscle Force of Intermittent Submaximal Constructions between Weight Lifters and Non-Weight Lifters
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Skeletal muscle fatigue is often associated with diminished athletic perfonnance and inability to maintain an expected force outputas a function of time. The purpose of thisstudy was to compare the effect of duration of exercise on skeletal muscle fatigue betw-een Weight Lifters(WL) and Non-Weight Lifters(NWL). There were twelve normal healthy adult volunteers, ranging in age from 18 to 35 years. The group consisted of six NWL and six WL. Randomized cross-over design was set up and work-rest cycle was 8 minutes work and 1 minute rest based on 15% MVC. Muscle fatigue was measured bythe amount of force produced by the wrist flexor muscle and EMG amplitude over time. Repeated measures ANOV As(2X4) were used to determine two types of subjects(WL,NWL) during four different duration of exercises(16, 32, 48, 64 minutes). The force decreased over time in NWL and WL, but there was no significant difference(F:=2.83, p>0.05). However, the EMG amplitude increased in WL(0.8200) and NWL(O.6348). The WL exhibited an increase in EMG at the end of the period, especially at 48 minutes of exeinrcisesthan did the NWL(F:=9.58, p<.05). This suggests the WL were able to adjust to prolonged effort with adaptations in neural effect over time, resulting in higher EMG amplitude. That is, WL may be able to learn to recruit more motor units with training. It is important to the degree of neuromuscular fatigue and the time needed for recovery may differ considerably between WL and NWL, there is a need to plan proper strength training or rehabilitaton protocols to match with the requirements in different characteristics of groups.
Abstract
Skeletal muscle fatigue is often associated with diminished athletic perfonnance and inability to maintain an expected force outputas a function of time. The purpose of thisstudy was to compare the effect of duration of exercise on skeletal muscle fatigue betw-een Weight Lifters(WL) and Non-Weight Lifters(NWL). There were twelve normal healthy adult volunteers, ranging in age from 18 to 35 years. The group consisted of six NWL and six WL. Randomized cross-over design was set up and work-rest cycle was 8 minutes work and 1 minute rest based on 15% MVC. Muscle fatigue was measured bythe amount of force produced by the wrist flexor muscle and EMG amplitude over time. Repeated measures ANOV As(2X4) were used to determine two types of subjects(WL,NWL) during four different duration of exercises(16, 32, 48, 64 minutes). The force decreased over time in NWL and WL, but there was no significant difference(F:=2.83, p>0.05). However, the EMG amplitude increased in WL(0.8200) and NWL(O.6348). The WL exhibited an increase in EMG at the end of the period, especially at 48 minutes of exeinrcisesthan did the NWL(F:=9.58, p<.05). This suggests the WL were able to adjust to prolonged effort with adaptations in neural effect over time, resulting in higher EMG amplitude. That is, WL may be able to learn to recruit more motor units with training. It is important to the degree of neuromuscular fatigue and the time needed for recovery may differ considerably between WL and NWL, there is a need to plan proper strength training or rehabilitaton protocols to match with the requirements in different characteristics of groups.