Table 3. Effects of two-week eccentric—concentric quadriceps exercise training on SSC function.
| Variables | Old | Young | 2-week % change and time main effect | Interaction | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Baseline | 2 weeks | Baseline | 2 weeks | ||||||||
| Wssc+ (J) | 49.26 | ±12.62 | 52.34 | ±11.75 | 74.01 | ±14.69 | 80.75 | ±18.6 | 8% | p = 0.033 | p = 0.402 |
| Wssc- (J) | 85.24 | ±17.17 | 81.31 | ±14.71 | 109.89 | ±16.78 | 107.32 | ±17.17 | -4.3% | p = 0.130 | p = 0.745 |
| Wssc+/Wcon | 1.12 | ±0.32 | 1.02 | ±0.11 | 1.11 | ±0.19 | 1.19 | ±0.21 | -0.9% | p = 0.850 | p = 0.041 |
| Tssc- (ms) | 231 | ±39 | 234 | ±64 | 234 | ±32 | 237 | ±32 | 1.2% | p = 0.758 | p = 0.990 |
| Tssc+ (ms) | 290 | ±134 | 258 | ±107 | 207 | ±46 | 198 | ±60 | -8.2% | p = 0.039 | p = 0.644 |
| Tssc (ms) | 521 | ±141 | 492 | ±156 | 441 | ±60 | 435 | ±85 | -3.7% | p = 0.548 | p = 0.684 |
Mean values (±SD) for the individual groups and percent change from baseline to two weeks for the two groups combined (time main effect) are presented.
SSC = stretch-shortening cycle
Wssc+ = mechanical work in the positive (concentric) phase of the SSC test contraction
Wssc- = mechanical work in the negative (eccentric) phase of the SSC test contraction
Wssc+/Wcon = ratio of the positive work in the SSC test contraction and the work in the pure concentric test contraction
Tssc- = time to complete the negative (eccentric) phase in the SSC test contraction
Tssc+ = time to complete the positive (concentric) phase in the SSC test contraction
Tssc = time to complete the entire SSC test contraction