The financial statement for 2012 shows turnover at the business, taken off the AIM stock market in 2009 by private equity firm Patron Capital in a £42.5 million deal, dropped from £29.1m to £28.3m.
An operating profit of almost £2.6m was wiped out by more than £3m of financing costs.
As well as the underlying pre-tax loss, Powerleague, which employs more than 600 people, also booked an exceptional item of £3.14m mainly relating to writedowns in the value of some of its 44 centres.
In 2011, Powerleague recorded an underlying pre-tax profit of £1.1m but an exceptional charge of £5.7m.
Writing in the 2012 accounts, the directors said the company had experienced challenges over the year, highlighting the squeeze on disposable income, the additional holiday for the Queen's Jubilee and the impact of the London Olympics.
Directors' emoluments increased from £500,000 to £612,000, with reward for the highest paid rising from £202,000 to £278,000.