Due to a preference of a dominant limb over a non-dominant limb, motor units become exposed to unequal conditions that demand different amounts of strength and fatigue resistance. Research led by Adam, De Luca, and Erim (1998) suggests that this manual asymmetry was shown to alter the physiological and mechanical properties of muscle. The dominant hand’s motor units had a lower average firing rate and lower recruitment threshold that coincides to the dominant hand having a higher percentage of slower twitch fibers that allow force buildup and twitch fusion to occur at lower firing rates. Preference of a muscle overtime may cause adaptations in the fiber composition of a muscle due to neural stimulation, hormone signals, availability of substrates,
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A conclusion drawn from this experiment is the adaptive nature of the muscle in regards to preference. A major percentage of people in this world are right hand dominant in which a majority of things have been designed for right hands. This temporarily forces left handed people to use their non-dominant hand for activities on a daily basis. This accounts for the lack of significant difference between right and left hands of a left handed person as they must use their non-dominant hand for strength requiring tasks and daily tasks requiring fine motor coordination, resulting in adaptation of the non-dominant hand. Right hand dominant people do not use their non-dominant hand as frequently resulting in little to no adaptation and a larger difference between grip strength differences. A clinical value that can be drawn from understanding grip strength in dominance of hand and the adaptive nature of the muscle fibers can be an important component for muscle rehabilitation as it can assess a patients initial …show more content…
Looking at the properties of fatigue speed, motor unit Type I has a higher fatigue resistance to the moderate level of fatigue resistance of the Type IIa motor unit or the Type IIb motor unit which has a very low fatigue resistance level of only a few seconds. The fatigue levels of the motor units share a relationship to metabolic characteristics as well as to the size of the neuron. Higher fatigue resistance such as that seen in Type I motor units have a higher use of aerobic respiration mechanisms, in which it uses oxidative mechanisms for low power but for a longer duration. In the Type IIb motor units, the motor units with the lowest fatigue resistance, a higher capacity for anaerobic mechanisms than aerobic through glycolytic mechanisms is observed in order to provide a high power for a short duration of time. The difference in the motor units possession of aerobic respiration capacity causes the differences in fatigue resistance. In the Type IIa motor unit, which has a moderate level of fatigue resistance, it is seen that this motor unit possesses both glycolytic and oxidative mechanisms that make it more resistant to fatigue than just the Type IIb motor unit, but still less resistant than the Type I motor unit which relies solely or aerobic respiration. Motor unit and muscle fibers that use aerobic mechanisms have been
A conclusion drawn from this experiment is the adaptive nature of the muscle in regards to preference. A major percentage of people in this world are right hand dominant in which a majority of things have been designed for right hands. This temporarily forces left handed people to use their non-dominant hand for activities on a daily basis. This accounts for the lack of significant difference between right and left hands of a left handed person as they must use their non-dominant hand for strength requiring tasks and daily tasks requiring fine motor coordination, resulting in adaptation of the non-dominant hand. Right hand dominant people do not use their non-dominant hand as frequently resulting in little to no adaptation and a larger difference between grip strength differences. A clinical value that can be drawn from understanding grip strength in dominance of hand and the adaptive nature of the muscle fibers can be an important component for muscle rehabilitation as it can assess a patients initial …show more content…
Looking at the properties of fatigue speed, motor unit Type I has a higher fatigue resistance to the moderate level of fatigue resistance of the Type IIa motor unit or the Type IIb motor unit which has a very low fatigue resistance level of only a few seconds. The fatigue levels of the motor units share a relationship to metabolic characteristics as well as to the size of the neuron. Higher fatigue resistance such as that seen in Type I motor units have a higher use of aerobic respiration mechanisms, in which it uses oxidative mechanisms for low power but for a longer duration. In the Type IIb motor units, the motor units with the lowest fatigue resistance, a higher capacity for anaerobic mechanisms than aerobic through glycolytic mechanisms is observed in order to provide a high power for a short duration of time. The difference in the motor units possession of aerobic respiration capacity causes the differences in fatigue resistance. In the Type IIa motor unit, which has a moderate level of fatigue resistance, it is seen that this motor unit possesses both glycolytic and oxidative mechanisms that make it more resistant to fatigue than just the Type IIb motor unit, but still less resistant than the Type I motor unit which relies solely or aerobic respiration. Motor unit and muscle fibers that use aerobic mechanisms have been