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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 - J Int Soc Sports Nutr (2015)

Bottom Line: There was no cumulative effect of Chr supplementation compared to A.On day 2 A showed a small non-significant increase but not a decrement as expected with Chr showing a decrease.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.

View Article: PubMed Central - PubMed

Affiliation: University of Hertfordshire, School of Life and Medical Science, College Lane, Hatfield, Hertfordshire AL10 9AB UK.

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 17.7% (p = 0.031) 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.

No MeSH data available.


Related in: MedlinePlus

Chronic force (newtons) output on day 1 and 2 (recovery) during repetitions to fatigue ± SD.
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Fig3: Chronic force (newtons) output on day 1 and 2 (recovery) during repetitions to fatigue ± SD.

Mentions: Furthermore, A Mg2+ showed no decline in recovery (day 2) performance for force (N) resulting in a small day 2 (recovery day) force increase of 2.7%, showing a trend but no significnace (Figure 2). On the contrary Chr Mg2+ showed a day-to-day 32.1% performance decrement (Figure 3).Figure 2


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 - J Int Soc Sports Nutr (2015)

Chronic force (newtons) output on day 1 and 2 (recovery) during repetitions to fatigue ± SD.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4419474&req=5

Fig3: Chronic force (newtons) output on day 1 and 2 (recovery) during repetitions to fatigue ± SD.
Mentions: Furthermore, A Mg2+ showed no decline in recovery (day 2) performance for force (N) resulting in a small day 2 (recovery day) force increase of 2.7%, showing a trend but no significnace (Figure 2). On the contrary Chr Mg2+ showed a day-to-day 32.1% performance decrement (Figure 3).Figure 2

Bottom Line: There was no cumulative effect of Chr supplementation compared to A.On day 2 A showed a small non-significant increase but not a decrement as expected with Chr showing a decrease.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.

View Article: PubMed Central - PubMed

Affiliation: University of Hertfordshire, School of Life and Medical Science, College Lane, Hatfield, Hertfordshire AL10 9AB UK.

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 17.7% (p = 0.031) 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.

No MeSH data available.


Related in: MedlinePlus