Abstract
Heart rate (HR) and 133-Xe clearance of four leg muscles (mm. vastus lateralis, gastrocnemius, tibialis anterior, and soleus) were monitored by portable transducers in six subjects during and after 100-m and 400-m runs on an indoor track. The recordings were fed into a PDP-11/34 computer system for further computation. After 100 m the fast recovery phase was completed after 4 min, while it lasted more than 10 min after the 400 m run, for muscle blood flows (MBF) and HR. After 400 m MBF increased markedly in mm. tibialis anterior and gastrocnemius compared to 100 m. HR after 100 m and 400 m correlated rectilinearly to the muscle hyperaemia indicating that both the central and the peripheral circulation are regulated according to the same local metabolic events in the muscles. Measurements of local 133-Xe muscle clearance might supplement the conventional EMG analysis in biomechanical studies. The light weight portable equipment for monitoring HR and radioactivity by external counting was functioning satisfactorily.
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