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Heavy resistance exercise training and skeletal muscle androgen receptor expression in younger and older men.
Steroids. 2011 Jan; 76(1-2):183-92.S

Abstract

Effects of heavy resistance exercise on serum testosterone and skeletal muscle androgen receptor (AR) concentrations were examined before and after a 21-week resistance training period. Seven healthy untrained young adult men (YT) and ten controls (YC) as well as ten older men (OT) and eight controls (OC) volunteered as subjects. Heavy resistance exercise bouts (5 × 10 RM leg presses) were performed before and after the training period. Muscle biopsies were obtained before and 1h and 48 h after the resistance exercise bouts from m.vastus lateralis (VL) to determine cross-sectional area of muscle fibers (fCSA) and AR mRNA expression and protein concentrations. No changes were observed in YC and OC while resistance training led to significant increases in maximal strength of leg extensors (1 RM), fCSA and lean body mass in YT and OT. Acute increases occurred in serum testosterone concentrations due to resistance exercises but basal testosterone remained unaltered. Mean AR mRNA expression and protein concentration remained unchanged after heavy resistance exercise bouts compared to pre-values. The individual pre- to post-training changes in resting (pre-exercise) AR protein concentration correlated with the changes in fCSA and lean body mass in the combined group of YT and OT. Similarly, it correlated with the changes in 1 RM in YT. Although mean AR expression did not changed due to the resistance exercise training, the present findings suggest that the individual changes of AR protein concentration in skeletal muscle following resistance training may have an impact on training-induced muscular adaptations in both younger and older men.

Authors+Show Affiliations

Department of Biology of Physical Activity and Neuromuscular Research Center, University of Jyväskylä, Jyväskylä, Finland. juha.ahtiainen@jyu.fiNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Journal Article

Language

eng

PubMed ID

21070797

Citation

Ahtiainen, Juha P., et al. "Heavy Resistance Exercise Training and Skeletal Muscle Androgen Receptor Expression in Younger and Older Men." Steroids, vol. 76, no. 1-2, 2011, pp. 183-92.
Ahtiainen JP, Hulmi JJ, Kraemer WJ, et al. Heavy resistance exercise training and skeletal muscle androgen receptor expression in younger and older men. Steroids. 2011;76(1-2):183-92.
Ahtiainen, J. P., Hulmi, J. J., Kraemer, W. J., Lehti, M., Nyman, K., Selänne, H., Alen, M., Pakarinen, A., Komulainen, J., Kovanen, V., Mero, A. A., & Häkkinen, K. (2011). Heavy resistance exercise training and skeletal muscle androgen receptor expression in younger and older men. Steroids, 76(1-2), 183-92. https://doi.org/10.1016/j.steroids.2010.10.012
Ahtiainen JP, et al. Heavy Resistance Exercise Training and Skeletal Muscle Androgen Receptor Expression in Younger and Older Men. Steroids. 2011;76(1-2):183-92. PubMed PMID: 21070797.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Heavy resistance exercise training and skeletal muscle androgen receptor expression in younger and older men. AU - Ahtiainen,Juha P, AU - Hulmi,Juha J, AU - Kraemer,William J, AU - Lehti,Maarit, AU - Nyman,Kai, AU - Selänne,Harri, AU - Alen,Markku, AU - Pakarinen,Arto, AU - Komulainen,Jyrki, AU - Kovanen,Vuokko, AU - Mero,Antti A, AU - Häkkinen,Keijo, Y1 - 2010/11/09/ PY - 2010/08/12/received PY - 2010/10/15/revised PY - 2010/10/29/accepted PY - 2010/11/13/entrez PY - 2010/11/13/pubmed PY - 2011/4/1/medline SP - 183 EP - 92 JF - Steroids JO - Steroids VL - 76 IS - 1-2 N2 - Effects of heavy resistance exercise on serum testosterone and skeletal muscle androgen receptor (AR) concentrations were examined before and after a 21-week resistance training period. Seven healthy untrained young adult men (YT) and ten controls (YC) as well as ten older men (OT) and eight controls (OC) volunteered as subjects. Heavy resistance exercise bouts (5 × 10 RM leg presses) were performed before and after the training period. Muscle biopsies were obtained before and 1h and 48 h after the resistance exercise bouts from m.vastus lateralis (VL) to determine cross-sectional area of muscle fibers (fCSA) and AR mRNA expression and protein concentrations. No changes were observed in YC and OC while resistance training led to significant increases in maximal strength of leg extensors (1 RM), fCSA and lean body mass in YT and OT. Acute increases occurred in serum testosterone concentrations due to resistance exercises but basal testosterone remained unaltered. Mean AR mRNA expression and protein concentration remained unchanged after heavy resistance exercise bouts compared to pre-values. The individual pre- to post-training changes in resting (pre-exercise) AR protein concentration correlated with the changes in fCSA and lean body mass in the combined group of YT and OT. Similarly, it correlated with the changes in 1 RM in YT. Although mean AR expression did not changed due to the resistance exercise training, the present findings suggest that the individual changes of AR protein concentration in skeletal muscle following resistance training may have an impact on training-induced muscular adaptations in both younger and older men. SN - 1878-5867 UR - https://www.unboundmedicine.com/medline/citation/21070797/Heavy_resistance_exercise_training_and_skeletal_muscle_androgen_receptor_expression_in_younger_and_older_men_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0039-128X(10)00264-3 DB - PRIME DP - Unbound Medicine ER -