Resistance exercise on two consecutive days induces cortisol, CK, IgA responses in active young males

We examined the effects of androstenedione supplementation on the hormonal profile of 10 males and its interaction with resistance exercise. Baseline testosterone, luteinizing hormone, estradiol, and androstenedione concentrations were established by venous sampling at 3 hr intervals over 24 hr. Subjects ingested 200 mg of androstenedione daily for 2 days, with second and third day blood samples. Two weeks later, they ingested androstenedione or a placebo for 2 days, in a double-blind, cross-over design. On day 2, they performed heavy resistance exercise with blood sampled before, after, and 90 min post. The supplement elevated plasma androstenedione 2-3-fold and luteinizing hormone ∼70% but did not alter testosterone concentration. Exercise elevated testosterone, with no difference between conditions. Exercise in the supplemented condition significantly elevated plasma estradiol by ∼83% for 90 min. Androstenedione supplementation, thus, is unlikely to provide male athletes with any anabolic benefit and, with heavy resistance exercise, elevates estrogen. Key Words: testosterone, luteinizing hormone, estradiol, fluid shifts, resistance exercise

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Effects of a single dose of N-Acetyl-5-methoxytryptamine (Melatonin) and resistance exercise on the growth hormone/IGF-1 axis in young males and females

Journal of the International Society of Sports Nutrition ◽

10.1186/1550-2783-4-14 ◽

2007 ◽

Vol 4 (1) ◽

pp. 14 ◽

Cited By ~ 7

Author(s):

Erika Nassar ◽

Chris Mulligan ◽

Lem Taylor ◽

Chad Kerksick ◽

Melyn Galbreath ◽

...

Keyword(s):

Growth Hormone ◽

Single Dose ◽

Resistance Exercise ◽

Young Males ◽

Males And Females

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Impact of Resistance Exercise under Hypoxia on Postexercise Hemodynamics in Healthy Young Males

International Journal of Hypertension ◽

10.1155/2018/1456972 ◽

2018 ◽

Vol 2018 ◽

pp. 1-10

Author(s):

Masahiro Horiuchi ◽

Arisa Ni-i-nou ◽

Mitsuhiro Miyazaki ◽

Daisuke Ando ◽

Katsuhiro Koyama

Keyword(s):

Resistance Exercise ◽

Random Order ◽

Hypoxic Condition ◽

Young Males ◽

Minute Interval ◽

Experimental Protocols ◽

The Mean ◽

Underlying Mechanisms ◽

Resting Period ◽

Hypoxic Exercise

We investigated the effects of resistance exercise under hypoxia on postexercise hemodynamics in eight healthy young males. The subjects belonged to a track & field club (sprinters, hurdlers, and long jumpers) and engage in regular physical training (1-2 h per day, 3-5 days per week). Each participant performed eight sets of bilateral leg squats with a one-minute interval under normoxia (room air) and hypoxia (13 % FiO2). During a 60-minute recovery, we set normoxic condition either after normoxic or hypoxic exercise. These two experimental protocols (normoxia and hypoxia) were performed in a random order with a one-week washout period. The leg squat exercise consists of 50 % 1-RM (14 repetitions) × 5 sets and 50% 1-RM (repetitions max; 7 repetitions) × 3 sets. The resting period between each set was 1 min, and a total of 91 repetitions were performed. Blood pressure, heart rate (HR), and several biomarkers were measured pre- and postexercise. The mean arterial pressure (MAP) significantly decreased after exercise compared to the pre-exercise values under both conditions (P < 0.05). The MAP at 20 and 30 min of recovery in hypoxia was significantly lower than in normoxia (P < 0.05, respectively). The antidiuretic hormone significantly increased after 60 min of recovery in both conditions; moreover, the values in hypoxia were significantly higher than those in normoxia (P < 0.05). The delta changes in MAP from baseline (pre-exercise) were significantly related to changes in HR from baseline in normoxia (r = 0.560, P < 0.001) but not in hypoxia. These results suggest that the hypoxic condition elicits greater hypotension after resistance exercise in comparison to normoxia. Moreover, the underlying mechanisms for the attenuation of hypotension after resistance exercise may differ between normoxia and hypoxia.

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433 THE EFFECT OF AMINO ACID INGESTION AND RESISTANCE EXERCISE ON GROWTH HORMONE RESPONSES IN YOUNG MALES

Medicine & Science in Sports & Exercise ◽

10.1249/00005768-199305001-00435 ◽

1993 ◽

Vol 25 (Supplement) ◽

pp. S77 ◽

Cited By ~ 2

Author(s):

R. R. Suminski ◽

R. J. Robertson ◽

F. L. Goss ◽

A. G. Robinson ◽

S. G. DaSilva ◽

...

Keyword(s):

Growth Hormone ◽

Amino Acid ◽

Resistance Exercise ◽

Young Males ◽

Hormone Responses

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Limiting the blood pressure response in young males during dynamic resistance exercise through intermittent rest

South African Journal for Research in Sport Physical Education and Recreation ◽

10.4314/sajrs.v31i1.43788 ◽

2009 ◽

Vol 31 (1) ◽

Author(s):

TP Kruger ◽

JM Van Rooyen

Keyword(s):

Blood Pressure ◽

Resistance Exercise ◽

Blood Pressure Response ◽

Pressure Response ◽

Dynamic Resistance ◽

Young Males

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Effects of Resistance Exercise Order on the Number of Repetitions Performed to Failure and Perceived Exertion in Untrained Young Males

Journal of Human Kinetics ◽

10.2478/hukin-2013-0080 ◽

2013 ◽

Vol 39 (1) ◽

pp. 177-183 ◽

Cited By ~ 2

Author(s):

Nuno Romano ◽

José Vilaça-Alves ◽

Helder M. Fernandes ◽

Francisco Saavedra ◽

Gabriel Paz ◽

...

Keyword(s):

Resistance Exercise ◽

Perceived Exertion ◽

Body Height ◽

Acute Effect ◽

Young Males ◽

Male Adolescents ◽

Essential Variable ◽

Resistance Exercises ◽

Within Subjects ◽

Post Hoc

Abstract Exercise order is an essential variable of resistance training (RT) programs which is usually related to repetition performance. The purpose of this study was to investigate the acute effect of different resistance exercise order on the number of repetitions performed to failure and related ratings of perceived exertion (RPE). Thirteen male adolescents (age: 14.46 ± 1.39 years, body height: 165.31 ± 12.75 cm, body mass: 58.73 ± 12.27 kg, estimated body fat: 21.32 ± 2.84%), without previous experience in RT, performed four resistance exercises: incline leg press (ILP), dumbbell lunge (DL), bench press (BP) and lying barbell triceps extension (TE) in two sequences - Sequence A (SEQA): ILP, DL, BP and TE; sequence B (SEQB): ILP, BP, DL and TE. The exercise sequences were performed in a randomized crossover design with a rest interval of 72h between sessions. Within-subjects analysis showed significant differences in the number of repetitions performed to failure in both sequences, but not in the RPE. Post-hoc tests revealed significant decrements in the number of repetitions from the first to the remaining exercises in both sequences. However, pairwise comparisons did not indicate significant differences between the same exercises performed in different sequences. In conclusion, the results of the current study in adolescents suggest that the main exercises should be performed at the beginning of the RT session.

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Impact of Inter-Set Short Rest Interval Length on Inhibitory Control Improvements Following Low-Intensity Resistance Exercise in Healthy Young Males

Frontiers in Physiology ◽

10.3389/fphys.2021.741966 ◽

2021 ◽

Vol 12 ◽

Author(s):

Keigo Tomoo ◽

Tadashi Suga ◽

Kento Dora ◽

Takeshi Sugimoto ◽

Ernest Mok ◽

...

Keyword(s):

Resistance Exercise ◽

Recovery Period ◽

Stroop Interference ◽

Exercise Recovery ◽

Rest Interval ◽

Post Exercise ◽

Young Males ◽

Low Intensity ◽

Post Exercise Recovery ◽

Interference Score

The length of rest interval between sets (i.e., inter-set rest interval) is an important variable for resistance exercise program. However, the impact of the inter-set rest interval on improvements in cognitive function following resistance exercise remains unknown. In this study, we compared the effect of short rest interval (SRI) vs. long rest interval (LRI) protocols on post-exercise cognitive inhibitory control (IC) improvements induced by low-intensity resistance exercise. Twenty healthy, young males completed both SRI and LRI sessions in a crossover design. The bilateral knee extensor low-intensity resistance exercise was programed for six sets with 10 repetitions per set using 40% of one-repetition maximum. The inter-set rest interval lengths for SRI and LRI protocols were set for 1 and 3min, respectively. The color-word Stroop task (CWST) was administrated at six time points: baseline, pre-exercise, immediate post-exercise, and every 10min during the 30-min post-exercise recovery period. The levels of blood lactate, which may be an important determinant for improving IC, throughout the 30-min post-exercise recovery period were significantly higher following SRI protocol than following LRI protocol (p=0.002 for interaction effect). In line with this result, large-sized decreases in the reverse-Stroop interference score, which represent improved IC, were observed immediately after SRI protocol (d=0.94 and 0.82, respectively, vs. baseline and pre-exercise) as opposed to the moderate-sized decreases immediately after LRI protocol (d=0.62 and 0.66, respectively, vs. baseline and pre-exercise). Moreover, significant decreases in the reverse-Stroop interference score were observed from 10 to 30min after SRI protocol (all ps<0.05 vs. baseline and/or pre-exercise), whereas no such decrease was observed after LRI protocol. Furthermore, the degree of decreases in the reverse-Stroop interference score throughout the 30-min post-exercise recovery period was significantly greater in SRI protocol than in LRI protocol (p=0.046 for interaction effect). We suggest that the SRI protocol is more useful in improving post-exercise IC, potentially via greater circulating lactate levels, compared to the LRI protocol. Therefore, the inter-set rest interval length may be an important variable for determining the degree of cognitive function improvements following resistance exercise in healthy young males.

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