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Table 1 General properties of force production

From: Effects of task and age on the magnitude and structure of force fluctuations: insights into underlying neuro-behavioral processes

Force level 10%   20%   40%   60%   80%  
Group Young Old Young Old Young Old Young Old Young Old
Measure Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD)
Mean 10.06 (0.34) 10.45 (1.64) 19.78 (0.44) 19.92 (1.14) 39.26 (0.80) 39.33 (1.11) 58.54 (1.62) 57.94 (1.81) 78.05 (2.17) 76.50 (3.45)
SD 0.41 (0.22) 0.79 (0.40) 0.47 (0.11) 0.71 (0.24) 0.94 (0.25) 1.22 (0.58) 1.99 (0.77) 2.52 (2.49) 2.82 (0.98) 3.56 (2.78)
CV 0.04 (0.02) 0.08 (0.04) 0.02 (0.01) 0.04 (0.01) 0.02 (0.01) 0.03 (0.01) 0.03 (0.01) 0.04 (0.05) 0.04 (0.01) 0.05 (0.04)
Index of efficiency
S-t-N 28.14 (7.35) 16.53 (7.36) 44.53 (11.09) 30.67 (13.16) 45.13 (11.42) 35.71 (14.49) 34.08 (10.19) 31.86 (12.17) 31.09 (10.35) 28.34 (10.67)
Frequency analysis
Slope −1.02 (0.33) −0.88 (0.49) −1.31 (0.35) −1.05 (0.31) −1.74 (0.32) −1.55 (0.28) −1.92 (0.26) −1.65 (0.36) −1.89 (0.32) −1.85 (0.38)
Peak power (0–4 Hz) 0.05 (0.03) 0.15 (0.12) 0.10 (0.03) 0.21 (0.20) 0.52 (0.41) 0.54 (0.27) 3.00 (3.36) 9.23 (25.18) 5.14 (4.83) 9.35 (11.99)
Prop power (0–4 Hz) 0.134 (0.082) 0.099 (0.049) 0.130 (0.033) 0.094 (0.046) 0.115 (0.025) 0.109 (0.018) 0.136 (0.040) 0.129 (0.058) 0.130 (0.041) 0.133 (0.009)
Peak power (7–15 Hz) 0.02 (0.02) 0.08 (0.10) 0.02 (0.02) 0.07 (0.08) 0.03 (0.02) 0.07 (0.08) 0.07 (0.05) 0.10 (0.08) 0.19 (0.23) 0.18 (0.13)
Prop power (7–15 Hz) 0.041 (0.038) 0.039 (0.019) 0.018 (0.011) 0.033 (0.022) 0.007 (0.005) 0.014 (0.010) 0.006 (0.006) 0.009 (0.014) 0.007 (0.009) 0.007 (0.009)
Multiscale complexity analysis (SampEn)
Area 70.53 (6.75) 63.32 (10.43) 79.18 (7.59) 74.96 (13.59) 88.98 (9.94) 83.42 (10.95) 88.29 (9.94) 90.24 (11.65) 84.10 (16.40) 85.87 (14.39)
Area 30-60 40.83 (6.24) 35.98 (7.01) 46.13 (4.89) 42.41 (9.89) 54.08 (7.71) 48.87 (6.54) 53.92 (7.08) 54.68 (8.09) 51.86 (10.95) 52.44 (8.22)
Scale 4 1.69 (0.21) 1.64 (0.29) 1.45 (0.20) 1.63 (0.26) 1.16 (0.21) 1.34 (0.21) 1.02 (0.22) 1.12 (0.29) 0.97 (0.34) 1.01 (0.35)
Scale 10 1.38 (0.11) 1.29 (0.23) 1.38 (0.17) 1.42 (0.17) 1.40 (0.19) 1.42 (0.18) 1.37 (0.18) 1.38 (0.26) 1.28 (0.31) 1.30 (0.34)
Scale 30 1.29 (0.17) 1.16 (0.24) 1.53 (0.26) 1.34 (0.19) 1.65 (0.33) 1.55 (0.22) 1.57 (0.28) 1.65 (0.21) 1.51 (0.30) 1.62 (0.33)
  1. Means and standard deviations of the general properties of force production, signal-to-noise ratio (S-t-N), as well as results of the frequency and MSE analyses.