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minutes later. It was taken into consideration that this lag between the first and second phase might be explained by the attenuation of subjective effects resulting from mental concentration needed for taking the measurements and the onset of the subsequent influences was subtle. However, this subtlety of effect was experienced well after the measurements were done.
These early “accels” are generally sporadic, rather than universally synchronous with the contraction. One study group found sporadic “accels” in 99 % of 2000 births (Krebs et al., 1982). Occasionally, “accels” also occur in association wit uterine contractions resulting in a pattern (Sadovsky et al, 1984). Obstetric personnel look for these as reassuring signs of a functioning sympathetic nervous system and intact neurohormonal cardiovascular control linked to fetal behavior. Accels are so important that, if they are not seen, the fetus is submitted to irritants to stimulate them (Percastaing 2008). If this is unsuccessful, intervention is imminent and labor can be halted. Accels are the key sign that the fetus is ready (Hutson et al, 1982).