Changes In Plasma Aldosterone And Electrolytes Following High-Volume And High-Intensity Resistance Exercise Protocols In Trained Men

Keywords

fluid regulation; osmolality; plasma volume; potassium; sodium

Abstract

Program variables such as training intensity, volume, and rest interval length are known to elicit distinct hormonal, metabolic, and physical responses. However, little is known regarding resistance exercise (RE) program design and the fluid regulatory response. This investigation aimed to compare the plasma aldosterone (ALD), electrolyte, plasma volume (PV), and osmolality (P osm) responses following high-volume (HV; 4-6 × 10-12 reps, 70% 1 repetition maximum [1RM], 60-s rest) and high-intensity (HI; 6 × 3-5 reps, 90% 1RM, 180-second rest) RE protocols. Ten experienced, resistance-trained men (24.7 ± 3.4 years; 90.1 ± 11.3 kg; 176.0 ± 4.9 cm) performed each protocol in a random, counterbalanced order. Blood samples were obtained at baseline (BL), immediately (IP), 30 minutes (30P), and 1 hour (1H) postexercise. Significant trial × time interactions (p < 0.01) were observed in P osm, sodium (Na +), and potassium (K +), whereas a trend (p 0.06) was observed for ALD. The PV shift from BL-30P was greater than BL-IP and BL-1H (p ≤ 0.05), but no significant between-trial differences were noted. Comparisons between RE protocols revealed significantly greater (p ≤ 0.05) elevations during HV vs. HI in P osm at IP, 30P, and 1H; and Na + at IP and 30P. During HV, significant reductions (p ≤ 0.05) were noted in K + at IP compared with HI. Area under the curve analysis indicates a trend (p 0.07) toward a higher ALD response following HV compared with HI. Results of this study indicate that high-volume, moderate-intensity resistance exercise seems to augment the fluid regulatory response to a greater extent than low-volume, high-intensity training.

Publication Date

7-1-2016

Publication Title

Journal of Strength and Conditioning Research

Volume

30

Issue

7

Number of Pages

1917-1923

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1519/JSC.0000000000001276

Socpus ID

84976870089 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84976870089

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