WASHINGTON (Reuters) - The U.S. economy likely experienced record growth in the third quarter as more than $3 trillion in federal pandemic relief spending fueled historic consumer spending, but the deep scars from the COVID-19 recession could take a year or more to heal.No one disputes that the Commerce Department’s report Thursday on gross domestic product - one of the last major economic scorecards before next week’s presidential election - will be one for the history books. Nonetheless, it will do little to mitigate the human tragedy inflicted by the coronavirus pandemic, with tens of millions Americans still unemployed and more than 222,000 dead. With five days remaining to Election Day and trailing in most national opinion polls, President Donald Trump will probably seize on the stunning rebound in GDP as a sign of recovery following the deepest decline in at least 73 years. Even still, it likely will leave U.S. output some 4% below its level in the fourth quarter of 2019, a fact Trump’s challenger, Democrat Joe Biden, is almost certain to highlight along with signs that the growth spurt is fast petering out. “The figure for estimated GDP growth in the third quarter will be dramatic, and will have absolutely zero effect on the election,” said Christopher Way, associate professor of government at Cornell University. “It is economic performance in the first half of an election year that matters. For people who are still out of work or struggling with dwindling savings after the stimulus wears off, it will have little impact.” Gross domestic product probably rebounded at a 31% annualized rate last quarter, according to a Reuters survey of economists. That would be the fastest pace since the government started keeping records in 1947 and follow a historic 31.4% rate of decline in the second quarter. The expected surge in GDP growth would recoup a little over half of the 10.6% plunge in output in the first half of the year. By comparison, the economy contracted 4% peak to trough during the 2007-09 Great Recession. The rescue package provided a lifeline for many businesses and the unemployed, juicing up consumer spending, which on its own is estimated to have made up about 80% of the jump in GDP.