Static work is more tedious than dynamic work. Why does muscle fatigue occur during static work; than dynamic?

1) during static work, many skeletal muscles contract at the same time; during dynamic work, different muscle groups contract alternately
2) the causes of fatigue may be processes occurring in the skeletal muscles themselves (accumulation of metabolic products, for example, lactic acid), or fatigue of the nerve centers; which control the work of muscles

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