Table 1

Characteristics of the participants with respect to demographics, hand function and basic measures of corticomotor excitability (All values represent Mean ± SD)
Young Senior
(n=13) (n=17)
Demographics
  Age (years) 22.4 ± 3.0 73.0 ±7.6
  Gender (n) 9 M, 4 F 6 M, 11 F
  Edinburgh Handedness score (/20) 15.7 ± 3.4 17.7 ± 2.6
Hand Function
  Dexterity RH: 55.5 ± 4.9** RH: 88.5 ± 33.6**
  (GPT in s) LH: 67.5 ± 6.9 LH: 100.3 ± 38.9
  Pinch RH: 10.1 ± 2.6** RH: 7.2 ± 1.6
  Strength (kg) LH: 9.1 ± 2.4 LH: 6.7 ± 1.7
Corticomotor excitability a
  rMT RH: 61.0 ± 11.3 RH:70.1 ± 11.5**
  (% output) LH: 57.6 ± 8.3 LH: 65.9 ± 13.0
  MEP amplitude (mV) RH: 5.6 ± 1.8 RH: 3.6 ± 1.2
LH: 5.5 ± 1.8 LH: 3.5 ± 1.5
  MEP Latency (ms) RH: 20.2 ± 1.8 RH: 21.8 ± 2.1
LH: 20.1 ± 1.5 LH: 21.7 ± 2.3
  cSP duration (ms) RH: 141.5 ± 34.8 RH: 115.9 ± 24.2
LH: 148.9 ± 37.9 LH: 115.3 ± 26.0

aAll measures were derived from the hand contralateral to the hemisphere stimulated during the cSP/iSP assessment procedure. TMS data from one senior was incomplete (n=16).

Abbreviations: GPT Grooved Pegboard Test, RH Right Hand, LH Left Hand, MEP, rMT resting Motor Threshold, Motor Evoked Potential, cSP contralateral Silent Period.

**Significant right-left differences at p<0.01 in paired t-test comparisons.

Davidson and Tremblay

Davidson and Tremblay BMC Neuroscience 2013 14:62   doi:10.1186/1471-2202-14-62

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