The phrase "altered period" is correct and usable in written English.
It can be used in contexts where you are discussing a time frame that has been changed or modified in some way.
Example: "The altered period for the project deadline has caused some confusion among the team members."
Alternatives: "modified timeframe" or "changed duration".
A PD transgenic model via Thy-1 promoter mediated α-synuclein over-expression exhibited several circadian phenotypes in aging: a clear reduced wheel-running activity with altered period, altered temporal distribution of sleep, and decayed spontaneous neural activity in the SCN, suggested circadian rhythm is severely disrupted in the PD model (Kudo et al., 2011).
Altered period and responsiveness to zeitgebers (that is, entraining cues) are observed; furthermore, increasing circadian disorganization is associated with the severity of the AD pathology [ 2].
Although the rate of degradation is different in a circadian clock mutant with an altered period from that in the wild-type, the capacity to adjust starch degradation in response to an unexpectedly early night is not compromised.
We found that knockdown of Zfhx3 in the SCN of wild-type mice results in an altered period, which suggests that Zfhx3 has a function in adult brain, aside from its developmental role (Ishii et al., 2003).
These results indicate, more clearly than experiments using transgenic lines with altered period length [ 12], that the TTFL and posttranslational oscillators are strongly coupled under physiologically relevant conditions and that proteasome function is crucial to sustain their joint operation.
In mammals, rhythmically expressed clock genes, such as Period (PER) (1 and 2), Cryptochrome (CRY) (1 and 2) and Bmal1, are essential for accurate time-keeping, as mice lacking them exhibit altered period, or are arrhythmic, at both the behavioural and cellular level (Liu et al, 2007).
This phosphoswitch additionally explains the phenotype of Familial Advanced Sleep Phase (FASP) and CK1εtau genetic circadian rhythm disorders, metabolic control of PER2 stability, and how drugs that inhibit CK1 alter period.
Yet tetanus toxin expression in PDF+ cells does not significantly alter period or rhythmicity [72].
Broad expression of Rab5S43N using the cry24 driver failed to alter period or rhythmicity (Figure 1D; Table 1).
Here, we demonstrate that, despite known alterations of circadian function in Vipr2−/− mice, the lack of VPAC2 receptors does not alter period, amplitude or rate of damping of rhythms in PER2 expression in the Vipr2−/− MBH and pituitary.
An altered switching period could represent a marker for altered ongoing activity such as the one we can observe in animal models of neuropathic pain (unpublished data).
