TPT
04-17-2010, 02:53 PM
this study was quite interesting because it included competitive bodybuilders during the final 11 weeks before competition. maestu et al. (2010) investigated the effect of energy balance on body composition and anabolic-catobolic hormone levels during precontest to achieve negative energy balance. hormonal outcome measures included gh, igf-1, igfbp-3, test, and cortisol.
real cool shit here.
Anabolic and Catabolic Hormones and Energy Balance of the Male Bodybuilders During the Preparation for the Competition (http://journals.lww.com/nsca-jscr/Fulltext/2010/04000/Anabolic_and_Catabolic_Hormones_and_Energy_Balance .27.aspx)
Mäestu, Jarek; Eliakim, Alon; Jürimäe, Jaak; Valter, Ivo; Jürimäe, Toivo
The Journal of Strength & Conditioning Research. 24(4):1074-1081, April 2010.
doi: 10.1519/JSC.0b013e3181cb6fd3
Abstract:
Maestu, J, Eliakim, A, Jurimae, J, Valter, I, and Jurimae, T. Anabolic and catabolic hormones and energy balance of the male bodybuilders during the preparation for the competition. J Strength Cond Res 24(4): 1074-1081, 2010-The purpose of the study was to investigate simultaneous effects of energy balance, caloric intake, and the hormonal anabolic-catabolic balance in bodybuilders prior to competition. Fourteen male bodybuilders took part in an 11-week energy-restricted period to reduce body fat. The subjects were divided into the energy-restricted group (ERG) (n = 7), who were preparing for the competition, or the control group (CG) (n = 7) who continued to train regularly and did not change their dietary or training pattern. Participants were tested at 11 weeks (T1), 5 weeks (T2), and 3 days (T3) before competition for diet, body composition, and fasting hormonal assessment. Body mass and body fat percentage of ERG were significantly (p < 0.05) decreased during the study period. In ERG, insulinlike growth factor-1 (IGF-1) and insulin decreased significantly during the 11-week weight-reduction period (p < 0.05). Testosterone was decreased only from week 11 to week 5 (from 20.3 +/- 6.0 to 18.0 +/- 6.8 nmol/L). Changes in IGF-I concentration were significantly related to changes in insulin (r = 0.741), fat mass (r = 0.705), lean body mass (r = 0.696), and body mass (r = 0.652). Changes in insulin concentrations were significantly related to changes in fat mass (r = 0.630) and lean body mass (r = 0.725). These data indicate that severe energy restriction to extremely low body energy reserves decreases significantly the concentrations of 3 anabolic pathways despite high protein intake. Monitoring of insulin and IGF-1 concentration is suggested to prevent losses in muscle mass in energy-restricted conditions. Other nutritional strategies might be needed to prevent possible catabolic effect during preparation of bodybuilders to competition.
(C) 2010 National Strength and Conditioning Association
real cool shit here.
Anabolic and Catabolic Hormones and Energy Balance of the Male Bodybuilders During the Preparation for the Competition (http://journals.lww.com/nsca-jscr/Fulltext/2010/04000/Anabolic_and_Catabolic_Hormones_and_Energy_Balance .27.aspx)
Mäestu, Jarek; Eliakim, Alon; Jürimäe, Jaak; Valter, Ivo; Jürimäe, Toivo
The Journal of Strength & Conditioning Research. 24(4):1074-1081, April 2010.
doi: 10.1519/JSC.0b013e3181cb6fd3
Abstract:
Maestu, J, Eliakim, A, Jurimae, J, Valter, I, and Jurimae, T. Anabolic and catabolic hormones and energy balance of the male bodybuilders during the preparation for the competition. J Strength Cond Res 24(4): 1074-1081, 2010-The purpose of the study was to investigate simultaneous effects of energy balance, caloric intake, and the hormonal anabolic-catabolic balance in bodybuilders prior to competition. Fourteen male bodybuilders took part in an 11-week energy-restricted period to reduce body fat. The subjects were divided into the energy-restricted group (ERG) (n = 7), who were preparing for the competition, or the control group (CG) (n = 7) who continued to train regularly and did not change their dietary or training pattern. Participants were tested at 11 weeks (T1), 5 weeks (T2), and 3 days (T3) before competition for diet, body composition, and fasting hormonal assessment. Body mass and body fat percentage of ERG were significantly (p < 0.05) decreased during the study period. In ERG, insulinlike growth factor-1 (IGF-1) and insulin decreased significantly during the 11-week weight-reduction period (p < 0.05). Testosterone was decreased only from week 11 to week 5 (from 20.3 +/- 6.0 to 18.0 +/- 6.8 nmol/L). Changes in IGF-I concentration were significantly related to changes in insulin (r = 0.741), fat mass (r = 0.705), lean body mass (r = 0.696), and body mass (r = 0.652). Changes in insulin concentrations were significantly related to changes in fat mass (r = 0.630) and lean body mass (r = 0.725). These data indicate that severe energy restriction to extremely low body energy reserves decreases significantly the concentrations of 3 anabolic pathways despite high protein intake. Monitoring of insulin and IGF-1 concentration is suggested to prevent losses in muscle mass in energy-restricted conditions. Other nutritional strategies might be needed to prevent possible catabolic effect during preparation of bodybuilders to competition.
(C) 2010 National Strength and Conditioning Association