چکیده:
Introduction: The aim of this study was to investigate the effect of resistance and endurance exercises on the acute response of androgens, cortisol and lactate in elderly postmenopausal women.Material and Methods: In this cross-sectional research, 10 elderly postmenopausal women (Age=54.3±3.74 years, BMI= 24.88±2.07kg/m-2) participated in three protocols: 1) Resistance protocol (1 session, 3 sets of 10 repetitions of eight exercises with %80 1RM), 2) Endurance protocol (45 minutes of cycling at 60-70% Vo2max) and 3) Rest protocol (control group). Blood samples were taken before, immediately after, and 15 minutes after the end of each protocol. Finally, the serum levels of testosterone, dehydroepiandrosterone sulfate, cortisol andblood lactate were measured and the data was analyzed using GLM-Repeated Measures (ANOVA) at a Significance level of P<0.05.Results: Both resistance and endurance groups showed a significant increase in androgen and lactate serum levels after resistance and endurance exercises (P<0.05). But variations in androgens and lactate levels were not significant between the groups. There was no significant difference in within-group cortisol concentration, but there was a significant difference in cortisol levels between the groups in endurance exercise: after the endurance protocol, there were higher levels of cortisol in endurance group compared to resistance and rest groups.Discussion and Conclusion: The results showed that a single bout of resistance exercise or endurance exercise does not acutely influence androgens and lactate levels, though cortisol concentration increased following an endurance exercise session.
خلاصه ماشینی:
"In their study on 10 elderly women (67±3 years old), Hakkinen et al (2000) found that testosterone did not significantly increase following a session of heavy resistance exercise, but lactate concentration significantly increased in the participants following the exercise [17].
Hakkinen et al (1995) investigated the acute responses of testosterone and cortisol to a single-session heavy resistance exercise in 7 middle-aged women (mean age of 50 years) and 8 elderly women (mean age of 70 years).
In this regard, the present study aimed at investigating the effects of single-session endurance and a single-session resistance exercise on acute responses of androgens, cortisol and lactate in postmenopausal women aged between 50 and 60.
According to the present findings, the between- group variations of lactate are not significant following a session of resistance exercise, which is inconsistent with the findings of Copeland et al (2002) and Hakkinen et al (2000).
Further studies are needed to investigate the acute and chronic effects of both endurance and resistance exercises on these hormones as well as other anabolic hormones such as growth hormone and insulin-like growth factor in both trained and untrained women at different age levels.
Basal concentrations and acute responses of serum hormones and strength development during heavy resistance training in middle-aged and elderly men and women."