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Two light planes have collided midair over a regional Queensland airfield.

Grave fears are held for the occupants of both aircraft after the accident at the Caboolture aerodrome, north of Brisbane.

Emergency services were called just after 10.30am on Friday.

Police have been unable to confirm the number of passengers on board.

Queensland Ambulance and firefighters responded to a "significant incident" with paramedics assessing "multiple patients".

Investigations are under way and police are expected to hold a briefing later on Friday.

Caboolture Airfield caters to general aviation and ultralight aircraft and is not controlled by Airservices Australia.

A spokesman from the airfield confirmed the aircraft involved were registered and not linked to the gliding club based at the airfield.

He declined to comment on the incident.

The Australian Transport Safety Bureau will investigate the collision.

© AAP 2023

Just 4.5 minutes of vigorous daily activity could reduce the risk of some cancers, research suggests.

A University of Sydney-led study strapped more than 22,000 self-confessed "non-exercisers" with wearable devices to track their daily activity.

Researchers then followed the group's clinical health records for close to seven years to monitor for cancer.

As few as 4.5 minutes of vigorous intermittent lifestyle physical activity (VILPA) - defined as the short bursts of activity that make you huff and puff - was associated with a substantially lower cancer risk.

Activities can include vigorous housework, carrying heavy shopping around the grocery store, bursts of power walking or playing high-energy games with the kids.

"VILPA is a bit like applying the principles of High-Intensity Interval Training (HIIT) to your everyday life," Professor Emmanuel Stamatakis of the University of Sydney's Charles Perkins Centre said.

"It's quite remarkable to see that upping the intensity of daily tasks for as little as four to five minutes a day, done in short bursts of around one minute each, is linked to an overall reduction in cancer risk by up to 18 per cent, and up to 32 per cent for cancer types linked to physical activity."

The study examined the data from 22,398 people with an average age of 62 who didn't exercise in their leisure time.

A minimum of about 3.5 minutes of daily vigorous intermittent activity was associated with an up to 18 per cent reduction in cancer incidence when compared with no activity.

About 4.5 minutes of daily vigorous intermittent activity was associated with up to 32 per cent reduction in physical activity-related cancer incidence.

Prof Stamatakis said researchers needed to further investigate the link through more robust trials, but said findings suggested the exercise might be a promising, cost-free option for lowering cancer risk in people who find structured exercise difficult or unappealing.

"We are just starting to glimpse the potential of wearable technology to track physical activity and understand how unexplored aspects of our lives affect our long-term health," he said.

"The potential impact on cancer prevention and a host of other health outcomes is enormous."

The research was published in the JAMA Oncology journal on Friday.

© AAP 2023

CASES REPORTED TO THE AUSTRALIAN FINANCIAL COMPLAINTS AUTHORITY:

* 96,987 complaints lodged in 2022/23 financial year, a 34 per cent increase

FINANCIAL DIFFICULTY:

* 53,638 banking and financial complaints, up 27 per cent

* Financial difficulty complaints up nine per cent

* Home loan complaints up 10 per cent

* Credit card complaints up 15 per cent

* Buy now, pay later complaints up 57 per cent

SCAMS:

* 6048 scam-related complaints, up 46 per cent increase

* Personal transaction accounts overtook credit cards as most complained about product with disputes up 86 per cent

INSURANCE DELAYS:

* 27,924 general insurance complaints, up 50 per cent

* Insurance claim handling delay complaints up 76 per cent

* Superannuation complaints up 32 per cent

* Superannuation claim delay complaints up 136 per cent

RESOLUTIONS:

* 86,185 complaints closed

* Average of 69 days to resolve complaints

* $253.8 million in compensation and refunds after coming to AFCA

* $75.5 million remediation secured for 368,602 people after AFCA investigations

STATE OF PLAY IN 2022/23 FINANCIAL YEAR:

* ACT 1904 complaints, up 63 per cent

* Tasmania 1187 complaints, up 29 per cent

* NSW 29,804 complaints, up 28 per cent

* Queensland 17,785 complaints, up 26 per cent

* South Australia 5481 complaints, up 26 per cent

* Victoria 26,232 complaints, up 25 per cent

* NT 584 complaints, up 23 per cent

* West Australia 7546 complaints, up 21 per cent

© AAP 2023