Table 1.
Number of MUs, type I %MHC isoform content, recruitment threshold, derecruitment threshold, and firing rate ranges, and slope and y-intercept values for FR-REC vs. REC, MFR vs, REC, and FR-DEREC vs. DEREC relationships
| FR-REC vs. REC |
MFR vs. REC |
FR-DEREC vs. DEREC |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Subject | No. of MUs | Type I %MHC | Slope | y-Int | RT Range | FR Range | Slope | y-Int | FR Range | Slope | y-Int | DT Range | FR Range |
| 1 | 29 | 25.91 | −0.152 | 12.856 | 9.24–24.71 | 9.24–24.71 | −0.615* | 35.633 | 22.95–32.52 | −0.388* | 14.361 | 4.66–19.51 | 5.86–16.73 |
| 2 | 37 | 65.25 | 0.131 | 7.647 | 0.44–30.71 | 3.95–20.10 | −0.307* | 28.414 | 19.45–29.69 | −0.03 | 9.446 | 0.37–31.49 | 4.77–14.18 |
| 3 | 28 | 33.87 | 0.140 | 8.172 | 1.33–22.92 | 2.97–20.13 | −0.489* | 29.796 | 18.56–30.66 | −0.153 | 12.729 | 8.96–20.47 | 6.15–16.71 |
| 4 | 10 | 35.23 | −0.252 | 9.456 | 3.45–20.88 | 3.27–11.39 | −0.503* | 22.835 | 13.52–23.33 | 0.130 | 5.712 | 4.64–27.74 | 4.53–12.01 |
| 5 | 27 | 49.25 | 0.049 | 10.418 | 1.62–14.70 | 7.00–15.92 | −0.403* | 29.938 | 23.47–31.13 | −0.019 | 10.418 | 7.45–24.66 | 6.35–12.58 |
| 6 | 10 | 51.68 | 0.033 | 13.412 | 4.96–17.00 | 7.21–18.66 | −0.317* | 31.191 | 25.77–30.54 | 0.445 | 6.796 | 12.52–19.71 | 8.73–24.79 |
| 7 | 16 | 42.81 | 0.099 | 6.592 | 0.92–24.43 | 4.19–15.73 | −0.259* | 24.185 | 15.96–23.81 | −0.085 | 9.854 | 7.63–28.48 | 3.76–14.64 |
| 8 | 26 | 42.23 | −0.165 | 11.642 | 0.76–21.63 | 3.55–17.56 | −0.467* | 29.408 | 18.21–30.22 | −0.153 | 13.787 | 12.39–26.61 | 8.10–16.71 |
| 9 | 14 | 67.91 | 0.506 | 3.235 | 9.61–16.79 | 7.63–16.63 | −0.211 | 29.292 | 23.78–29.36 | 0.467* | 2.376 | 13.00–32.31 | 9.74–22.97 |
| 10 | 12 | 58.27 | 0.757 | −3.227 | 13.04–23.89 | 5.37–19.27 | −0.379* | 33.529 | 22.90–29.41 | 0.315 | 6.303 | 5.11–18.27 | 5.16–15.60 |
| 11 | 21 | 30.73 | −0.320 | 11.152 | 3.79–17.18 | 3.79–14.80 | −0.653* | 27.952 | 16.61–26.86 | −0.031 | 8.173 | 3.66–25.61 | 5.14–12.03 |
| 12 | 27 | 34.27 | −0.186* | 10.715 | 12.62–37.08 | 3.20–11.44 | −0.557* | 29.289 | 9.91–26.73 | −0.161* | 10.822 | 6.95–31.80 | 4.36–11.77 |
| Mean | 0.053 | 8.506 | 5.15–22.66 | 5.11–17.19 | −0.430 | 29.289 | 19.26–28.69 | 0.028 | 9.231 | 7.28–25.56 | 6.05–15.89 | ||
| SD | 0.316 | 4.663 | 4.73–6.37 | 2.12–3.78 | 0.141 | 3.474 | 4.74–2.89 | 0.262 | 3.551 | 3.92–5.09 | 1.88–4.20 | ||
Values are no. of motor units (MUs), type I % myosin heavy chain (%MHC) isoform content, recruitment threshold (RT) and derecruitment threshold (DT) ranges (expressed as % of maximal voluntary contraction), firing rate (FR) range (expressed as pulses per second), and slope and y-intercept (y-Int) values for the MU firing rate at recruitment (FR-REC) vs. recruitment (REC), mean firing rate (MFR) vs. REC, and firing rate at derecruitment (FR-DEREC) vs. derecruitment (DEREC) threshold relationships.
*
Significant relationship.