caa a22 4500 469054115 CHVBK 20180323132838.0 cr unu---uuuuu 170328e19920101xx s 000 0 eng 10.1007/BF01466274 doi (NATIONALLICENCE)springer-10.1007/BF01466274 One-handed load carrying — Cardiovascular, muscular and subjective indices of endurance and fatigue [Elektronische Daten] [Å. Kilbom, G. Hägg, C. Käll] Summary: A group of 5 women and 11 men walked on a treadmill, each carrying a weight in the right hand. In separate experiments, the mass was varied to give total exhaustion within 3 min, 5 min, 9 min, and 13 min. In additional experiments 50% and 25% of the masses leading to exhaustion after 5 min were used, and these were stopped after 16 min. Heart rate (f c) and systolic blood pressure (BPs) were measured noninvasively. There was a consistent increase in (f c) x BPs during the experiments leading to exhaustion, while steady-states were obtained in the nonexhausting trials. An electromyogram (EMG) was recorded with cutaneous electrodes over the flexor carpi ulnaris and flexor digitorum superficialis muscles and the number of zero crossings (ZC) of the EMG signal per time unit were analysed. As the subjects approached exhaustion, the number of ZC declined exponentially, reaching approximately 50% of their initial values. In the nonexhausting experiments, however, the decline was slower and less marked, and during the second half of the experiment the number of ZC increased again. Subjectively, endurance was underestimated by all the subjects. It was concluded that cardiovascular and muscle criteria of fatigue in carrying coincided. Prolonged carrying in one hand of more than 6 kg or 10 kg for young healthy women and men respectively should not be recommended, since it could lead to cardiovascular non steady-states and EMG signs of fatigue. Springer-Verlag, 1992 Blood pressure nationallicence Carrying nationallicence Electromyogram nationallicence Fatigue nationallicence Heart rate nationallicence Kilbom Å. Division of Applied Work Physiology, National Institute of Occupational Health, S-17184, Solna, Sweden aut Hägg G. Division of Applied Work Physiology, National Institute of Occupational Health, S-17184, Solna, Sweden aut Käll C. Division of Applied Work Physiology, National Institute of Occupational Health, S-17184, Solna, Sweden aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/1(1992-01-01), 52-58 0301-5548 65:1<52 1992 65 421 https://doi.org/10.1007/BF01466274 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01466274 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kilbom Å. Division of Applied Work Physiology, National Institute of Occupational Health, S-17184, Solna, Sweden aut NATIONALLICENCE 700 1- Hägg G. Division of Applied Work Physiology, National Institute of Occupational Health, S-17184, Solna, Sweden aut NATIONALLICENCE 700 1- Käll C. Division of Applied Work Physiology, National Institute of Occupational Health, S-17184, Solna, Sweden aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/1(1992-01-01), 52-58 0301-5548 65:1<52 1992 65 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer