Abstract
Purpose
To examine the mitogen-activated protein kinase (MAPK) family of signaling proteins following typical high volume (HV) and high intensity (HI) lower body resistance exercise protocols in resistance-trained men.
Methods
Ten resistance-trained men (24.7 ± 3.4 year; 90.1 ± 11.3 kg; 176.0 ± 4.9 cm) performed each resistance exercise protocol in a random, counterbalanced order. The HV protocol utilized a load of 70 % 1-RM for sets of 10–12 repetitions with a 1-min rest period length between sets and exercises. The HI protocol utilized a load of 90 % 1-RM for sets of 3–5 repetitions with a 3-min rest period length between sets and exercises. Both protocols included six sets of barbell back squats and four sets of bilateral leg press, bilateral hamstring curls, bilateral leg extensions, and seated calf raises. Fine needle muscle biopsies of the vastus lateralis were completed at baseline (BL) and 1-h post exercise (1H).
Results
No significant differences over time were noted for phosphorylation of MEK1, ERK1/2, p38, MSK1, ATF2, p53, or c-Jun (p > 0.05). No significance between trial interactions was noted for phosphorylation of MAPK signaling proteins, including MEK1, ERK1/2, p38, JNK, MSK1, ATF2, STAT1, p53, c-Jun, or HSP27 (p > 0.05). However, significant time effects were observed for phosphorylation of JNK (p < 0.01), HSP27 (p < 0.01), and STAT1 (p = 0.03). Phosphorylation of JNK, HSP27, and STAT1 was significantly elevated from BL at 1H for both HV and HI.
Conclusions
HV and HI lower body resistance exercise protocols appear to elicit similar MAPK activation in resistance-trained men.
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Abbreviations
- 1-RM:
-
1-repetition maximum
- 1H:
-
1-h post exercise
- ANOVA:
-
Analysis of variance
- ATF2:
-
Activating transcription factor 2
- AU:
-
Arbitrary units
- BL:
-
Baseline
- ERK1/2:
-
Extracellular signal-related kinase 1/2
- HI:
-
High intensity
- HPL:
-
Human Performance Laboratory
- HSP27:
-
Heat shock protein 27
- HV:
-
High volume
- JNK:
-
c-Jun N-terminal kinase
- MAPK:
-
Mitogen-activated protein kinase
- MEK1:
-
Mitogen-activated protein kinase 1
- MSK1:
-
Mitogen- and stress-activated protein kinase 1
- mTORC1:
-
Mammalian target of rapamycin complex 1
- p70S6k:
-
p70S6 kinase
- RPS6:
-
Ribosomal protein S6
- STAT1:
-
Signal transducer and activator of transcription 1
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Communicated by William J. Kraemer.
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Gonzalez, A.M., Hoffman, J.R., Townsend, J.R. et al. Intramuscular MAPK signaling following high volume and high intensity resistance exercise protocols in trained men. Eur J Appl Physiol 116, 1663–1670 (2016). https://doi.org/10.1007/s00421-016-3417-8
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DOI: https://doi.org/10.1007/s00421-016-3417-8