Muskett (60), who runs for Hill City-University, broke her own age group (60+) world record in the 12hr race in the Sri Chinmoy series in Auckland at the weekend.
Despite an ankle complaint in the three weeks leading up the event, she ran 110.79km, almost 1.5km further than her previous record, set in Adelaide earlier this year.
Muskett was not on target to break her record at the marathon and 6hr marks, but put in a strong second half to win the race and topple her previous record.
''I had a poor first six hours, it didn't quite go how I wanted. But the second six hours was pretty good,'' she said.
''It's a 400m running track. You're literally just going round and round ...
it's mind over matter.''
Before setting her original record in Adelaide, Muskett was just looking for events to use as training.
''I needed something to keep the wheels turning, so I said to my husband, `Don't buy me a birthday present ...
let's find a race that I can go and have a go at a world record.'''The aim was to go and have a holiday and break the record, which I did.''
Muskett, who ran the Christchurch marathon in 3hr 35min earlier in the year, has represented New Zealand 12 times in various distances and plans to make it 13 next year.
She ran 193km at the world championships in the Netherlands last year to qualify for next year's event in Italy.
If running 24hr straight was not enough, she plans to run a six-day race in England or Australia after next year's world championships.
''My aim is to represent New Zealand one last time while I'm 60 ...
then I may well appear in a six-day race before I finally actually hang up my shoes. I want to try just one.''
As well as Muskett's most recent record, she holds five world records in the 55-59 age group.
She set records in the 50km, 100km, 6hr hour track, 12hr road and 12hr track in 2010.
''I've got my eye on the 1000km record and maybe the 24hr record. That would happen at the world champs.
''I would like to finish my career with about 10-12 world records and having represented New Zealand 13 times.''
- by Robert Van Royen
