Age-Related Increase in Electromyography Burst Activity in Males and Females

Table 2

Sex-related differences in burst characteristics for each muscle group.

	Male	Female
Number
BB	8887±5398	10069±4541 *
TB	5609±4206	8731±5919 *
VL	5886±2642	6781±3922 *
BF	7869±4334	9713±4650 *
Duration (sec)
BB	0.4±0.1	0.6±0.3 *
TB^†	0.4±0.1	0.6±0.1 *
VL	0.5±0.2	0.4±0.2
BF	0.6±0.2	0.6±0.1
Peak amplitude (% MVE)
BB	5.4±1.5	5.6±1.4
TB	4.8±0.6	4.9±0.8
VL	10.1±3.6	8.1±1.9
BF^†	11.5±3.7	7.5±2.8 *
Mean amplitude (% MVE)
BB	1.1±1.0	1.4±1.1
TB	0.8±0.6	1.2±0.9
VL	1.2±1.0	1.0±1.0
BF	1.9±1.4	1.5±1.0
Percentage (% time)
BB	13.6±11.0	21.1±13.9
TB	9.1±8.7	15.9±13.5
VL	11.2±8.7	10.3±7.2
BF	15.3±9.0	17.7±9.9

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