"heightened difficulty" is a correct and usable phrase in written English.
You can use it when describing a situation that is more challenging or difficult than usual. For example: - The increased number of COVID-19 cases has led to a heightened difficulty in managing hospital resources. - The new math curriculum has posed a heightened difficulty for students to grasp certain concepts. - The intense heatwave has added a heightened difficulty to firefighters battling the wildfires.
Wevers was next and performed a routine of exquisite artistry and heightened difficulty.
Focusing on a migraine diagnosis, our data provide evidence that mothers with migraine have higher levels of alexithymia compared to mothers in the control group, showing a heightened difficulty in identifying feelings.
A third potentially contributing source of inhibition for CT{8,8} recombination in HeLa is the heightened difficulty of the pMF inversion assay.
7b It is interesting to note that the N U values for the acenes show an additional increase at n=9 indicating an even heightened difficulty in preparing acenes with n>9.
It heightened the difficulty when, without breaking their physical connection, they dropped over the edge of the church's raised altar and descended to the floor.
Mangum maintains the low scores were more a product of Mother Nature's work, but he and Jones conspired to heighten the difficulty this time.
It is possible that the observed relationships are circular and that, even if higher emotional difficulties impede cognitive development, lags in cognitive development in turn may heighten emotional difficulties.
Such effects include difficulties, intrusive imagery, heightened sense of vulnerability, difficulty trusting others, and emotional numbing".
Thorpe's difficulties heightened at the subsequent German leg of the tour in Berlin, when a standoff over a drug-test arose when officials wanted to take an unsealed sample due to lack of containers.
These results suggest that perhaps siblings of children with severe ADHD and associated neuropsychological difficulties are at a particularly heightened risk of later difficulties [ 88].
Adding more contemporary factors like video game play and DVR playback into what was already a mix of Friday-night diversions has only heightened the degree of difficulty.
