PMID: 1201748Dec 5, 1975Paper

Dependence of mean duration of heart period and of arrhythmia during dynamic muscular work on the greatness and differences of work load and during static muscular work on the greatness of work load (author's transl)

European Journal of Applied Physiology and Occupational Physiology
E Klotzbücher

Abstract

Mean duration of heart period (DHP chi) and its standard deviation (SD), indicating heart arrhythmia and significantly correlating with DHP chi, decreased with stepwise increase of dynamic muscular work on a bicycle ergometer and static muscular work of the right upper arm flexor beyond the limit of permanent performance. This correlation, however, can be understood globally only, since the decrease of DHP chi and SD was not always continuous, but frequently changing, with alterations of increase and decrease from step to step of dynamic work load and from minute to minute of static muscular strain. This concerned particularly SD. A continuous decrease of DHP chi in dynamic muscular work was obtained only by load differences of 40 W, not by differences of 10 or 20 W. A more continuous decrease of SD was also noted during greater load-differences. The significant correlation of DHP chi and SD was lost at a load-difference of 10 W on the 60 W-step and at a load-difference of 40 W on the 180 W-step. Great loads caused at the same load-step less frequent variations of DHP chi, not of SD, than little loads. If no preceding work took place, a contary reaction of DHP chi and SD was noted often at the first load-step. Static work with ...Continue Reading

References

Jan 1, 1973·Ergonomics·B M Sayers
Nov 1, 1954·The American Journal of Physiology·F F KAO, L H RAY

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