The phrase "an initial fast" is correct and usable in written English.
It can be used when referring to the first period of fasting in a sequence or as part of a dietary regimen.
Example: "Before starting the detox program, participants are required to complete an initial fast lasting 24 hours."
Alternatives: "a preliminary fast" or "an introductory fast".
Both groups also received an initial FAST ultrasound.
The cells manage an initial fast organization of the cytoskeleton in reaction to the islands [14].
In vitro drug release from coatings monitored over 2 weeks presented an initial fast release followed by a slower release.
The sorption is characterized by an initial fast step, with most pharmaceuticals being removed within the first 24 h.
The mineral portion contributed an initial fast release of nutrients to the plants, followed by a slow release from the organic portion, ensuring nutrient availability for long periods.
The first trigger level is implemented in custom-built electronics and makes an initial fast selection based on detector data of coarse granularity.
Quantitative analysis of the in situ micrographs reveals that the void-healing process involves several stages: an initial fast-healing stage, then a slow-healing stage, and finally a rapid healing near the end.
This enabled to show that increasing values of drug efficacy result in an initial faster decline of viral load followed by a slower second phase.
The atorvastatin contained in the fast-release layer showed an initial fast-release of more than 60% of its drug content within 2 h, followed by sustained release of the atenolol for a period of 12 h.
A further study in patients receiving adefovir revealed an interesting biphasic decline profile of viral kinetics, which included an initial faster phase and a second slower phase.
On the other hand, when fluorescein sodium values were plotted, some regression lines were biphasic, representing an initial faster turnover rate and a subsequent slower turnover rate.
