At what heart rate does loss of fine motor skills typically occur?

Loss of fine motor skills can start to occur at a heart rate around 145 beats per minute (BPM). At this elevated heart rate, the body begins to experience physiological changes such as increased adrenaline levels and heightened sympathetic nervous system activity, which can lead to decreased dexterity and coordination.

When the heart rate exceeds this threshold, fine motor skills can significantly decline due to reduced blood flow to the extremities and a higher level of physical stress on the body. Thus, while lower heart rates might maintain fine motor function, crossing this threshold disrupts the ability to perform tasks requiring precision.

Understanding this physiological response is crucial, especially in high-stress environments where individuals may need to maintain control and coordination. The other options are not correct since they represent heart rates where fine motor skills impairment is either not recognized or occurs only after 145 BPM.