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932��0.998 vs ?0.389��0.563, respectively; PIPI-145 nmr (Table 3). Figure 2 Mean pulse wave amplitude during rest, static/isometric handgrip exercise, post-exercise circulatory arrest (PECA) and recovery period, in NBW and LBW individuals. Discussion HRV ratio and PWA responses to activation of the muscle metaboreflex are exaggerated in LBW compared to NBW individuals. This suggests that the EPR, which is involved in tight regulation of the cardiovascular response to exercise, is persistently dysregulated into early adulthood for LBW individuals.10,14 HRV ratio for LBW was modestly elevated at rest, although there was no significant difference between the HRV ratios of the two groups. This may be due to LBW individuals being prenatally programmed to increase sympathetic nerve activity secondary to the adverse intra-uterine conditions that the fetus will be subjected to.14 Studies have shown that the EPR is exaggerated in hypertensive rats, in part due to over activity of the afferents.3,13 We investigated the efferent component of the EPR; the afferent pathway has not been investigated in LBW subjects. In hypertensive subjects, exercise evokes an excessive increase in BP from a chronically elevated resting value.14 During exercise, compared to baseline, LBW individuals experienced an exaggerated Oxacillin sympathetic response to the static handgrip. This was indicated by a significant mean increase in HRV ratio (increased HRV ratio reflects an increase in sympathetic tone compared to the vagal tone) as well as a significant mean decrease in PWA (Table 3). LBW and NBW individuals had an increased sympathetic discharge to the heart and the peripheral vessels, although that of LBW individuals was exaggerated. The increased sympathetic discharge we observed in both groups is in keeping with the findings by Jarvis et al12 and Ichinose et al2 who described PI3K inhibitor an increase in sympathetic discharge in normal individuals. However, in these two studies birth weight was not considered as a variable while in our study it was.9,12 The mean increase in HRV ratio from baseline to PECA decreased but was not significantly different between the two groups (Table 3), whilst the mean decrease in PWA showed a significant difference between the two groups (LBW and NBW). This indicated a potentiated sympathetic discharge in response to accretion of metabolites in the once active muscle, with the differences in the sympathetic discharge to the heart and the peripheral vessels during PECA being probably due to the fact that there is organ specific sympathetic nerve activity and regional differences in this nerve activity as is experienced particularly in cardiovascular diseases.
