WASHINGTON (AP) — The U.S. economy grew at a meager 1 percent annual pace this spring, slower than previously estimated. The downward revision will likely increase fears that the economy is at risk of another recession.

Fewer exports and weaker growth in business stockpiles led the Commerce Department to lower its estimate for the April-June quarter from its previous rate of 1.3 percent growth. That means the economy expanded only 0.7 percent in the first six months of the year.

Nine of the past 11 recessions since World War II have been preceded by a period of growth of 1 percent or less, economists note. Still, many said the revision hasn't changed their outlook for the rest of this year.

The weaker growth could rattle an already edgy stock market, which has lost 12 percent of its value since July 21.

Stock futures fell after the report was released.

Economists worry this summer's sell-off on Wall Street could hurt growth in the second half of the year, if consumers and businesses pull back on spending and investment.

High gas and food prices have already eroded consumers' buying power. Spending increased only 0.4 percent in the April-June period, the weakest growth since the final three months of 2009.

The revision showed spending was a bit higher than the government's first estimate of 0.1 percent growth. But the increase mostly reflected greater spending on health care, insurance and financial services, the government said.

People bought fewer long-lasting manufactured goods, such as autos and appliances. Those purchases fell 5.1 percent this spring, the biggest drop since the final three months of 2008. That partly reflects a shortage of autos on many dealer lots after the March 11 earthquake in Japan. Consumers spending accounts for 70 percent of growth.

"Consumption still barely had a pulse," said Tom Porcelli, chief U.S. economist at RBC Capital Markets.

Government spending contracted for the third straight quarter. And spending by state and local governments declined for the seventh time in eight quarters.

Federal Reserve Chairman Ben Bernanke will deliver a highly-anticipated speech later Friday in Jackson Hole, Wyo. Investors hope he will signal that the Fed will launch a new effort to boost the economy, but analysts don't expect anything ambitious.

The central bank has already cut the benchmark short-term interest rate it controls to nearly zero, and last week pledged to keep it there until mid-2013. But so far lower interest rates haven't helped: mortgage rates, for example, are already at record lows, and home sales are still falling.

Several dismal economic reports have suggested the economy worsened in the July-September quarter, sending the stock market lower. Manufacturing in the mid-Atlantic region contracted in August by the most in more than two years, a survey by the Federal Reserve Bank of Philadelphia found. A Richmond Fed survey released Tuesday and a New York Fed survey last week also pointed to slowdowns in those areas, although not as severe.

There have been some positive signs. The economy added 117,000 net jobs in July, twice the number added in each of the previous two months. Consumers spent more on retail goods last month than in any month since March. U.S. automakers rebounded last month to boost factory production by the most since the Japan crisis.

Most economists aren't forecasting a recession. JPMorgan Chase projects the U.S. economy will grow only 0.9 percent this year and 1.7 percent in 2012, much lower than the bank's estimates just a few weeks ago. Other economists have made similar downgrades.

Thursday's report is the second of three estimates the government issues for each quarter's economic growth. The estimates are updated with more recent data that wasn't available for the first take.