In the last trading session, U.S. stocks ended up lower as the International Monetary Fund reduced its 2015 global growth forecast by 20 basis points from its prior estimate in July. As for the top ETFs, investors saw (SPY - ETF report) lose 0.3% and (QQQ - ETF report) fall 0.5%, while (DIA - ETF report) moved higher by 0.1% on the day.

Two more specialized ETFs are worth noting in particular as both saw trading volume far outside of normal. In fact, both these funds experienced volume levels that were more than double their average for the most recent trading session. This could make these ETFs the ones to watch in the days ahead to see if this trend of extra-interest continues:

(XHS - ETF report): Volume 3.1 times average

This healthcare services ETF was in focus yesterday as around 169,000 shares moved hands on the day compared to an average of roughly 54,000 shares. We also saw some share price movement as shares of XHS declined 1.7% yesterday.

The movement can largely be blamed on the rout in healthcare stocks following the growing discourse on drug prices and disappointing sales guidance by some of the major healthcare companies. For the past one month, XHS went down 9.1% but it currently has a Zacks ETF Rank #1 (Strong Buy) with a Medium risk outlook.

(DBJP - ETF report): Volume 4.6 times average

This Japan ETF was in the spotlight as roughly 2.1 million shares moved hands yesterday compared to an average of roughly 448,000 shares. DBJP dropped 0.9% in the session.

The move can be attributed to the lack of any announcement regarding new stimulus measures by the Bank of Japan leading to a fall in Japanese shares that we find in this ETF portfolio. However, DBJP gained 1.1% in the past one month and it currently has a Zacks ETF Rank #2 (Buy) with a Medium risk outlook.