The effect of acute vs chronic magnesium supplementation on exercise and recovery on resistance exercise, blood pressure and total peripheral resistance on normotensive adults
Kass LS, Poeira F
Journal of the International Society of Sports Nutrition · 18 citations
Review labels
Neutral facts our review recorded about how this study was done. They describe method, never whether we like the result.
How it was studied
- Design
- Randomized controlled trial (indexed by PubMed)
- Studied in
- People
- Main outcome
- Health markers and function
Who paid for it
- Funding
- Funding not disclosed
Publication
- Published
- 2015-04-23 · J Int Soc Sports Nutr · vol. 12 · issue 1 · p. 19
- Publisher
- Springer Science+Business Media
- Cited
- 32 citations · more than 74% of similar papers · 0.9× the field average
- References
- 44 works
- Access
- Open access (journal) · CC-BY
- Research areas
- Magnesium in Health and Disease · Cardiovascular and exercise physiology · Parathyroid Disorders and Treatments
- Keywords
- Medicine, Bench press, Blood pressure, Magnesium, Clinical nutrition, Placebo, Resistance training, Internal medicine, Anesthesia
- MeSH
- cardiovascular system, humans, magnesium, diet, cross-over studies, double-blind method, blood pressure, vascular resistance, dietary supplements, adult, middle aged, female, male, muscle strength, resistance training, recommended dietary allowances
2 authors
From GB
- Lindsy S. Kass · correspondingUniversity of Hertfordshire
- Filipe PoeiraUniversity of Hertfordshire
Abstract
Background
Magnesium supplementation has previously shown reductions in blood pressure of up to 12 mmHg. A positive relationship between magnesium supplementation and performance gains in resistance exercise has also been seen. However, no previous studies have investigated loading strategies to optimise response. The aim of this study was to assess the effect of oral magnesium supplementation on resistance exercise and vascular response after intense exercise for an acute and chronic loading strategy on a 2-day repeat protocol.
Methods
The study was a randomised, double-blind, cross-over design, placebo controlled 2 day repeat measure protocol (n = 13). Intense exercise (40 km time trial) was followed by bench press at 80% 1RM to exhaustion, with blood pressure and total peripheral resistance (TPR) recorded. 300 mg/d elemental magnesium was supplemented for either a 1 (A) or 4 (Chr) week loading strategy. Food diaries were recorded.
Results
Dietary magnesium intake was above the Reference Nutrient Intake (RNI) for all groups. Bench press showed a significant increase of 7.7% (p = 0.031) [corrected] for A on day 1. On day 2 A showed no decrease in performance whilst Chr showed a 32.1% decrease. On day 2 post-exercise systolic blood pressure (SBP) was significantly lower in both A (p = 0.0.47) and Chr (p = 0.016) groups. Diastolic blood pressure (DBP) showed significant decreases on day 2 solely for A (p = 0.047) with no changes in the Chr. TPR reduced for A on days 1 and 2 (p = 0.031) with Chr showing an increase on day 1 (p = 0.008) and no change on day 2.
Conclusion
There was no cumulative effect of Chr supplementation compared to A. A group showed improvement for bench press concurring with previous research which was not seen in Chr. On day 2 A showed a small non-significant increase but not a decrement as expected with Chr showing a decrease. DBP showed reductions in both Chr and A loading, agreeing with previous literature. This is suggestive of a different mechanism for BP reduction than for muscular strength. TPR showed greater reductions with A than Chr, which would not be expected as both interventions had reductions in BP, which is associated with TPR.
Abstract via Europe PMC. Copyright remains with the authors or publisher (CC BY).
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