Table 1.

Voluntary strength, anthropometric parameters, and bilateral surface EMG of the ST muscles

Parameter	Young	Old
N	10	10
Age, yr	26 ± 4	81 ± 4*
Height, cm	183 ± 4	176 ± 6*
Mass, kg	85 ± 7	81 ± 9
MVC, N	690.3 ± 122.3	409.3 ± 140.5*
Surface EMG at 25% MVC
Left side, %RMS	28.9 ± 7.1	30.5 ± 6.9
Right side, %RMS	33.1 ± 10.4	38.6 ± 12.5
Surface EMG at 50% MVC
Left side, %RMS	55.5 ± 6.1	54.4 ± 9.3
Right side, %RMS	58.0 ± 10.5	57.4 ± 3.9

Values are presented as the means ± SD. ST, superior trapezius; MVC, maximal voluntary isometric contraction; RMS, root mean square.

^*P < 0.05.