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Reconstruction of the influence of grinding technology on upper limb muscle activity
Struška, Michal ; Sládek, Vladimír (advisor) ; Hora, Martin (referee)
Interpretation of changes of humeral asymmetry during the Holocene period was based on the analysis of upper limb muscle activity during cereal grinding using the saddle quern and rotary quern. The aim of the diploma thesis was to test if the dominant upper limb muscle activity during cereal grinding using the saddle quern and rotary quern might be estimated by measuring the activity of musculus deltoideus (pars clavicularis), musculus infraspinatus, musculus pectoralis major and musculus triceps brachii (caput longum). Using surface electromyography, we have analyzed activity of musculus biceps brachii, musculus deltoideus (pars clavicularis), musculus deltoideus (pars acromialis), musculus deltoideus (pars spinalis), musculus pectoralis major, musculus infraspinatus, musculus triceps brachii (caput laterale) and musculus triceps brachii (caput longum) during cereal grinding using the saddle quern and rotary quern in 25 subjects. Consistent with our prediction, musculus biceps brachii was the least active muscle during saddle quern grinding and clockwise rotary grinding, therefore it is possible to exclude musculus biceps brachii from the sample of analyzed muscles. Pars clavicularis, pars acromialis and pars spinalis of musculus deltoideus were more active during rotary quern grinding than...
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