Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Fraction of time spent at high-activity levels. The fraction of time spent engaged in high level activities (running, walking continuously) did not differ between day and night on day −1. On day +4, only the RNR group had significant differences, with a larger fraction of active intervals in the night in high-level activities than in the daytime. DT, daytime; NT, nighttime; CCI, controlled cortical injury; RNR, rapid nonimpact head rotation.
