Jim Harbaugh: 'Criticism inspired Colin Kaepernick'

San Francisco 49ers head coach Jim Harbaugh has revealed that quarterback Colin Kaepernick used criticism of his game as an inspiration to guide his team to a win over the St Louis Rams.

Kaepernick was off the boil in his side's defeats to the Seattle Seahawks and the Indianapolis Colts, but bounced back with a fine performance against the Rams as his side recorded a 35-11 victory.

"Energy is energy," Harbaugh told reporters. "And there's positive energy, there's negative energy.

"And sometimes a person can get more energy from negative energy. Sometimes that can be a gift. Thank You."

The 49ers moved back to 2-2 in their season after week four.