Plasma hyaluronan concentration: no circadian rhythm but large effect of food intake in humans

Abstract

This study was designed to determine if a circadian rhythm in plasma hyaluronan concentration [HA] exists in the absence of physical activity, and if plasma [HA] is associated with feeding in human subjects. Five persons were studied under standardized conditions, blood samples being taken between 0600 and 2200 hours at 30-min intervals. Any orthostatic challenge and muscle activity was abolished by immobilization by a 6° head-down bed-rest, and the effect of a quasi-continuous ingestion of energy compared a normal, three-portion diet of equivalent energy content or to fasting. Reproducibility of HA profiles on two consecutive half-days was also studied. A highly sensitive immunoassay was used to determine plasma [HA]. The data indicated that without physical activity and without food ingestion, [HA] was unchanged and displayed no diurnal rhythm. In addition, we observed that [HA] increased after the first food intake, peaking after 60 min, and concluded from our results that without ingestion of a larger meal, and sessions of postural or muscle activity, no circadian plasma [HA] rhythm exists.

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Accepted: 10 June 1998

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Rössler, A., László, Z., Kvas, E. et al. Plasma hyaluronan concentration: no circadian rhythm but large effect of food intake in humans. Eur J Appl Physiol 78, 573–577 (1998). https://doi.org/10.1007/s004210050463

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  • Key words Bedrest
  • Circadian rhythm
  • Hyaluronan
  • Hyaluronic acid
  • Lymph flux