Adjusts to 400x gravity

Vegeta didn't care for the pomp and circumstance, but he did have an appreciation for significant events. This was the first time he actually felt like a Prince for as long as he could remember. After losing his race, Vegeta had despaired of ever experiencing his first command. These memories only served as a reminder of his loss, however, and Vegeta quickly stormed off to his new gravity chamber. The moment of melancholy evaporated as the Saiyan immediately set the gravity to ten times that of his home planet, Vegeta. The machine hummed with a low steady pulse as it engaged, causing even the light in the room to seem heavy.

"Pah, is this all?" Vegeta laughed as he kicked a few lightning fast blows to his side. "I'm not going to get anywhere training at such a low level." He quickly upped the intensity to over thirty times that of his home planet. When it had fully initiated, he found the effects to be quite desirable. "This is more like it." He could have easily handled much higher levels had he turned into a Super Saiyan, but it bothered him that Goku's normal state had been above him on Namek. "I will surpass you, Kakarott – in every way!"

The first three days of training went well, although Vegeta found that he overdid it a few times. Never could it be said that another trained harder or exerted himself more fully than the Prince of Saiyans. He pushed himself to his limits and beyond, despite needing to be at full strength against Cooler in a few short days. The medic aboard had not expected to be so busy, but Vegeta never once slept in his own bed. During the first three nights of the voyage he spent all his time in either the gravity chamber or the healing tank. He had worked himself up to 40x gravity (four hundred times that of earth) in only 72 hours, to the amazement of his crew.

- Bringer of Death Chapter 15