The anaerobic threshold (AT), the point at which lactic acid starts to accumulates in the muscles, is considered to be somewhere between 85% and 90% of your maximum heart rate (HRmax) .
Ultimately, Windows Defender might fail to update the definitions itself for whatever reason. In such cases you must either force a definition update by navigating to the designated tab of Windows Defender or by downloading and installing the latest signature definitions. The Windows Defender Definition Updates are offline packages containing the most recent antivirus signature for Windows Defender. Once installed, they will make sure your PC is safe from the latest known viruses, spyware, PUPs, and malicious files.
A customer can download the Forefront endpoint security definition updates by using any of the following three ways: Microsoft Update; Window Server Update Services; Manual Download ; File share (Forefront Endpoint Protection only) Microsoft Update Microsoft publishes definition updates to Microsoft Update. The Forefront endpoint security agent can download these updates directly from Microsoft by using any one of following methods: Control Panel item for Windows Update.