caa a22 4500 469055774 CHVBK 20180323132843.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF00717946 doi (NATIONALLICENCE)springer-10.1007/BF00717946 Neuromuscular adaptations and serum hormones in women during short-term intensive strength training [Elektronische Daten] [K. Häkkinen, A. Pakarinen, M. Kallinen] Summary: The effects were investigated in ten women of intensive heavy resistance strength training lasting for 3 weeks on electromyographic (EMG) activity, muscle cross-sectional area (CSA) and voluntary force production characteristics of leg extensor muscles. Blood samples for the determinations of serum hormones were taken from five of the subjects. Significant increases occurred in the higher force portions of the isometric force-time curve with an increase of 9.7 (SD 8.4)% (P<0.01) in maximal peak force. An increase of 15.8 (SD 20.9)% (P<0.05) took place also in the maximal neural activation (integrated EMG) of the trained muscles, while an enlargement of 4.6 (SD 7.4)% (P<0.05) occurred in the CSA of the quadriceps femoris muscle. Maximal force per muscle CSA increased significantly (P<0.05). No statistically significant changes were observed during the training in the mean concentrations of serum testosterone, free testosterone, cortisol and sex hormone binding globulin (SHBG). The individual concentrations of serum testosterone: SHBG ratio correlated with the individual changes obtained during the training in the muscle CSA (r=0.99;P<0.01). The present findings in women indicated that the increases in maximal strength during short-term but intensive strength training were primarily due to the increased voluntary activation of the trained muscles, while muscle hypertrophy remained limited in magnitude. Large interindividual differences in women in serum testosterone concentrations could indicate corresponding differences in muscle hypertrophy and strength development even during a short-term but intensive strength training period. Springer-Verlag, 1992 Strength training nationallicence Neural adaptations nationallicence Muscle hypertrophy nationallicence Serum hormones nationallicence Women nationallicence Häkkinen K. Department of Biology of Physical Activity, University of Jyväskylä, Jyväskylä, Finland aut Pakarinen A. Department of Clinical Chemistry, University of Oulu, Oulu, Finland aut Kallinen M. LIKES Research Center, Jyväskylä, Finland aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/2(1992-03-01), 106-111 0301-5548 64:2<106 1992 64 421 https://doi.org/10.1007/BF00717946 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00717946 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Häkkinen K. Department of Biology of Physical Activity, University of Jyväskylä, Jyväskylä, Finland aut NATIONALLICENCE 700 1- Pakarinen A. Department of Clinical Chemistry, University of Oulu, Oulu, Finland aut NATIONALLICENCE 700 1- Kallinen M. LIKES Research Center, Jyväskylä, Finland aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/2(1992-03-01), 106-111 0301-5548 64:2<106 1992 64 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer