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| LETTER TO EDITOR |
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| Year : 2014 | Volume
: 14
| Issue : 2 | Page : 175-176 |
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Effects of continuous and intermittent resistance training on urinary and serum levels of sodium, potassium, and uric acid in young women
Suzan Sanavi1, Mohammad Ali Kohanpour2, Hamid Agha-Alinejad3
1 Department of Clinical, Iranian Comprehensive Hemophilia Care Center, Tehran, Iran
2 The Young Researchers Club, Islamic Azad University, Tehran, Iran
3 Department of Physical Education and Sport Sciences, Faculty of Humanities, University of Tarbiat Modarres, Tehran, Iran
| Date of Web Publication | 9-Oct-2014 |
Correspondence Address:
Suzan Sanavi
Department of Clinical, Iranian Comprehensive Hemophilia Care Center, Tehran
Iran
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/1319-6308.142379
How to cite this article:
Sanavi S, Kohanpour MA, Agha-Alinejad H. Effects of continuous and intermittent resistance training on urinary and serum levels of sodium, potassium, and uric acid in young women. Saudi J Sports Med 2014;14:175-6 |
How to cite this URL:
Sanavi S, Kohanpour MA, Agha-Alinejad H. Effects of continuous and intermittent resistance training on urinary and serum levels of sodium, potassium, and uric acid in young women. Saudi J Sports Med [serial online] 2014 [cited 2023 Jun 10];14:175-6. Available from: https://www.sjosm.org/text.asp?2014/14/2/175/142379 |
Exercise causes physiological adaptations in athletes to maintain body equilibration including fluid and electrolytes balance. On the other hand, resistance training has recently been more popular particularly among women with health objectives. [1] With regard to the rarity of researches on the resistance exercise, the present study was conducted to compare the effects of continuous and intermittent resistance trainings with increasing intensity on urinary and serum levels of sodium, potassium, and uric acid. The study population consisted of 30 healthy women, aged 20-28 years old, who were randomly divided into two experimental groups: intermittent training (Group A), continuous training (Group B), and control group (Group C) (n = 10, each) during 8 weeks. Before, immediately and 2 h after the first test (48 h before the training program) and final exam (48 h after the end of sessions), serum and urine samples were obtained from all subjects. One week before implementing the study, the participants got familiarized with the training protocol in a meeting including education of strength movements, measurement of physical characteristics [Table 1], and calculation of one repetition maximum strength (1RM equals maximum weight that an individual can lift once) using the Brzycki formula: The amount of weight/(1.0278 - [0.0278 × number of repetitions]) related to each movement. [2] Two days before the study, the experimental groups met in a testing session with the intensity of 20% of 1RM, while blood samples were obtained at pretraining 1 and posttraining 1 (0 and 2 h) stages. The participants performed the training protocol (3 days/week) during 8 weeks with an increasing intensity rate of 5% of 1RM/week from 20% to 55%, respectively. Each training session included two circuits. Each circuit contained seven movements of chest press; leg press; and forearm, foreleg, hind arm, hamstrings, and lateral stretching. The time period was 2.5 min for each movement. There were 2-min and 1-min resting intervals between two circuits and two movements, respectively. Overall, each session lasted 65 min which included: a 10-min light warming up, 47-min resistance training and a 5-10 min cool down exercise. Group B performed each movement with a constant speed, controlled by a metronome, (V = one attempt/2.5 s), continuously, and Group A with different speed (2 V for 10 and ½ V for 20 s), intermittently. Two days after termination of training workouts, following an effort of 20% of 1RM, similar blood samples were collected as pretraining 2 and posttraining 2. Training workouts and samplings were performed in a similar time for each person to neutralize the effect of circadian rhythm. During this period, the control group did no exercise and had normal daily activities. Both experimental groups significantly showed decreased levels of serum and urinary sodium and potassium (P < 0.05) that may be attributed to the balanced effects of excessive fluid intake and increased tubular sodium reabsorption due to aldosterone secretion, respectively. [3] Serum uric acid significantly (P < 0.05) increased only in Group A. Although, a definitive conclusion cannot be made of previous studies, this inconsistency may be related to the difference of training protocols, in exercise type; intensity and duration. Serum electrolyte alteration following exercise still needs more controlled studies in the future.
| References | |  |
| 1. | Zorbas YG, Kakurin VJ, Denogratov SD, Yarullin VL, Deogenov VA. Urinary and serum electrolyte changes in athletes during periodic and continuous hypokinetic and ambulatory conditions. Biol Trace Elem Res 2001;80:201-19.  |
| 2. | Brzycki M. Strength testing - Predicting a one-rep max from reps-to-fatigue. J Phys Educ Recreation Dance 1993;68:88-90. |
| 3. | Noakes TD, Sharwood K, Speedy D, Hew T, Reid S, Dugas J, et al. Three independent biological mechanisms cause exercise-associated hyponatremia: Evidence from 2,135 weighed competitive athletic performances. Proc Natl Acad Sci U S A 2005;102:18550-5. |
[Table 1]
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