Table 1: Age-related differences in burst characteristics for each muscle group.

YoungOld

Number
 BB *
 TB *
 VL *
 BF *
Duration (sec)
 BB *
 TB *
 VL *
 BF *
Peak amplitude (% MVE)
 BB
 TB
 VL
 BF
Mean amplitude (% MVE)
 BB *
 TB *
 VL *
 BF *
Percentage (% time)
 BB *
 TB *
 VL *
 BF *

BB: biceps brachii; TB: triceps brachii; VL: vastus lateralis; BF: biceps femoris; sec: seconds; %: percentage; MVE: maximal voluntary exertion.
*Significantly different from young adults.
Only females.