The phrase "a recent study speculated" is correct and usable in written English.
It can be used when discussing findings or hypotheses presented in a recent research study.
Example: "A recent study speculated that climate change could lead to more extreme weather patterns in the coming decades."
Alternatives: "a recent study suggested" or "a recent study proposed".
A recent study has speculated its role in mediating a cross-talk between actin cytoskeleton and microtubule-based organelles during cell division [ 72].
In contrast, in a recent study, other investigators speculated about the role of SIRT3 in head and neck cancer by reviewing published gene array data from another source and observed that SIRT3 levels are decreased in head and neck cancer.
A recent study by PwC speculates that this new sector may grow to $335 billion in global revenues by 2025.
A recent study by Abtin [33] gives reason to speculate that this system is not restricted to P. aeruginosa.
Low serum creatinine levels were associated with a higher risk of T2DM in a recent study of non-obese middle-aged Japanese men [ 10], leading the authors to speculate that low creatinine might reflect low muscle mass volume.
In a recent study using zebrafish, Nyholm et al. (2008) showed that TBECH can be maternally transferred; they speculated that higher levels of TBECH would be found in the offspring of species that invest more lipids in their eggs, which is in line with the recent discovery of TBECH in eggs from herring gulls and double-crested cormorants (Gauthier et al. 2009).
A recent study [21] reports high costs of multiple mating for males (and none for females) and speculates that this could result in increased selection against heterospecific mating (as these have lowest fitness returns) in males.
A recent study from the Boston Federal Reserve found that the income of homeowners' children rises if home values rise, speculating that housing equity permits more human capital investment.
A recent study reported that many individuals who suffered from a fragility fracture did not associate their fracture with osteoporosis and speculated that there may be a relationship between risk perception and adherence to therapy [ 18].
Also, a recent study at seeps on the Norwegian margin revealed a negative correlation between meio- and macrofaunal abundance, and predation pressure was speculated to be the underlying cause for this pattern (Van Gaever et al., 2009).
