Table 5.
Hormone responses (uncorrected for plasma volume shifts) pre-exercise (Pre) to immediately post-exercise (IP) at week 1 (WK1) and week 6 (WK6) of resistance training.
| Variable | Group | |||
|---|---|---|---|---|
| TR70 (n = 12) | TR45 (n = 9) | BFR20 (n = 12) | CON (n = 8) | |
| Testosterone (ng/ml)c e | ||||
| WK1 Pre | 4.62 ± 1.24 | 5.84 ± 2.85 | 4.57 ± 2.45 | 4.54 ± 1.42 |
| WK1 IP** | 5.21 ± 1.27 | 6.34 ± 2.53 | 4.99 ± 2.44 | 5.04 ± 2.48 |
| WK6 Pre | 4.82 ± 1.74 | 5.89 ± 2.08 | 5.10 ± 2.68 | 5.14 ± 2.20 |
| WK6 IP | 5.36 ± 1.95** | 5.51 ± 2.37 | 5.13 ± 2.85 | 5.06 ± 2.09 |
| Abs ∆ (ng/m) | ||||
| WK1 | 0.59 ± 0.52 | 0.50 ± 0.84 | 0.41 ± 0.57 | 0.50 ± 1.31 |
| WK6 | 0.55 ± 0.54 | −0.38 ± 1.13 | 0.03 ± 0.51 | −0.08 ± 0.46 |
| Cortisol (μg/dL)b | ||||
| WK1 Pre | 30.18 ± 9.99 | 30.29 ± 14.90 | 29.40 ± 11.14 | 23.01 ± 8.63 |
| WK1 IP | 31.12 ± 7.95 | 33.37 ± 22.79 | 28.06 ± 14.46 | 20.06 ± 11.78 |
| WK6 Pre†† | 24.45 ± 8.68 | 28.71 ± 17.4 | 25.24 ± 8.27 | 19.01 ± 8.07 |
| WK6 IP†† | 25.62 ± 11.77 | 24.13 ± 11.59 | 23.64 ± 11.16 | 19.29 ± 9.15 |
| Abs ∆ (μg/dL) | ||||
| WK1 | 0.94 ± 6.25 | 3.08 ± 11.18 | −1.34 ± 10.33 | −2.94 ± 4.06 |
| WK6 | 1.17 ± 5.23 | −4.59 ± 6.73 | −1.60 ± 5.20 | 0.28 ± 5.80 |
| IGF-1 (ng/ml)d | ||||
| WK1 Pre | 137.32 ± 48.73 | 130.88 ± 44.06 | 131.76 ± 44.40 | 129.50 ± 73.32 |
| WK1 IP | 159.17 ± 55.68** | 136.90 ± 49.69 | 139.12 ± 45.00 | 139.94 ± 105.19 |
| WK6 Pre | 137.26 ± 59.23 | 144.20 ± 44.64 | 145.32 ± 49.04 | 98.71 ± 33.94 |
| WK6 IP | 150.55 ± 63.39** | 161.39 ± 57.31* | 157.48 ± 50.23** | 96.90 ± 39.00 |
| Abs ∆ (ng/ml) | ||||
| WK1 | 20.81 ± 17.86 | 6.02 ± 14.23 | 7.36 ± 9.48 | 10.44 ± 43.97 |
| WK6 | 13.29 ± 9.14 | 17.19 ± 18.05 | 12.16 ± 10.24 | −1.81 ± 11.65 |
| IGFBP-3 (ng/ml)a c d | ||||
| WK1 Pre | 2160.98 ± 491.63 | 2442.78 ± 283.63 | 2609.21 ± 479.05 | 2387.45 ± 343.59 |
| WK1 IP | 2300.38 ± 420.17** | 2497.93 ± 267.97 | 2717.69 ± 458.50 | 2199.03 ± 341.56* |
| WK6 Pre | 2032.23 ± 306.47 | 2353.86 ± 274.93 | 2665.36 ± 659.23 | 2355.07 ± 692.00 |
| WK6 IP | 2242.02 ± 502.94** | 2598.10 ± 372.74** | 2697.48 ± 654.30 | 2204.61 ± 530.59* |
| Abs ∆ (ng/ml) | ||||
| WK1 | 139.40 ± 170.50 | 55.15 ± 78.61 | 108.48 ± 200.96 | −188.42 ± 252.75 |
| WK6 | 209.79 ± 250.07 | 244.24 ± 161.0 | 32.11 ± 233.15 | −150.46 ± 223.44 |
Values are mean ± SD. TR70, high intensity 70% 1RM; TR45, moderate intensity 45% 1RM; BFR20, blood flow restriction 20% 1RM; CON, control; IGF-1, insulin-like growth factor-1; IGFBP-3, insulin-like growth factor binding protein-3; Abs Δ-absolute change vs. Pre.
a
Significant group effect.
b
Significant training effect.
c
Significant group × time interaction.
d
Significant time effect.
e
Significant training × time interaction.
*
p ≤ 0.05.
**
p ≤ 0.01 vs. Pre.
†
p ≤ 0.05.
††
p ≤ 0.01 vs. WK1.