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Fulltext The effect of acute pomegranate extract supplementation on oxygen uptake in highly-trained cyclists during high-intensity exercise in a high altitude environment

Crum EM, Che Muhamed AM, Barnes M, Stannard SR

J Int Soc Sports Nutr, 2017;14:14.
PMID: 28572749 DOI: 10.1186/s12970-017-0172-0

BACKGROUND: Recent research has indicated that pomegranate extract (POMx) may improve performance during aerobic exercise by enhancing the matching of vascular oxygen (O2) provision to muscular requirements. POMx is rich in ellagitannin polyphenols and nitrates (NO3-), which are both associated with improvements in blood flow and O2 delivery. Primarily, this study aimed to determine whether POMx improves performance in a cycling time trial to exhaustion at 100%VO2max (TTE100%) in highly-trained cyclists. In addition, we investigated if the O2 cost (VO2) of submaximal exercise was lower with POMx, and whether any changes were greater at high altitude where O2 delivery is impaired.
METHODS: Eight cyclists exercised at three submaximal intensities before completing a TTE100% at sea-level (SEA) and at 1657 m of altitude (ALT), with pre-exercise consumption of 1000 mg of POMx or a placebo (PLAC) in a randomized, double-blind, crossover design. Data were analysed using a three way (treatment x altitude x intensity) or two-way (treatment x altitude) repeated measures ANOVA with a Fisher's LSD post-hoc analysis. Significance was set at p ≤ 0.05. The effect size of significant interactions was calculated using Cohen's d.
RESULTS: TTE100% performance was reduced in ALT but was not influenced by POMx (p > 0.05). Plasma NO3- were 10.3 μmol greater with POMx vs. PLAC (95% CI, 0.8, 19.7,F1,7 = 7.83, p 0.05). Submaximal VO2 values were not affected by POMx (p ≥ 0.05).
CONCLUSIONS: The restoration of SEA VO2 values at ALT is likely driven by the high polyphenol content of POMx, which is proposed to improve nitric oxide bioavailability. Despite an increase in VO2, no change in exercise performance occurred and therefore this study does not support the use of POMx as an ergogenic supplement.
Fulltext COVID-19 impacts on coastal communities in Kenya

Lau J, Sutcliffe S, Barnes M, Mbaru E, Muly I, Muthiga N, et al.

Mar Policy, 2021 Dec;134:104803.
PMID: 34566239 DOI: 10.1016/j.marpol.2021.104803

COVID-19 is continuing to have far-reaching impacts around the world, including on small-scale fishing communities. This study details the findings from 39 in-depth interviews with community members, community leaders, and fish traders in five communities in Kenya about their experiences since the beginning of the COVID-19 pandemic in March, 2020. The interviews were conducted by mobile phone between late August and early October 2020. In each community, people were impacted by curfews, rules about gathering, closed travel routes, and bans on certain activities. Fish trade and fisheries livelihoods were greatly disrupted. Respondents from all communities emphasized how COVID-19 had disrupted relationships between fishers, traders, and customers; changed market demand; and ultimately made fishing and fish trading livelihoods very difficult to sustain. While COVID-19 impacted different groups in the communities-i.e., fishers, female fish traders, and male fish traders-all experienced a loss of income and livelihoods, reduced cash flow, declining food security, and impacts on wellbeing. As such, although small-scale fisheries can act as a crucial safety net in times of stress, the extent of COVID-19 disruptions to alternative and informal livelihoods stemmed cash flow across communities, and meant that fishing was unable to fulfil a safety net function as it may have done during past disruptions. As the pandemic continues to unfold, ensuring that COVID-19 safe policies and protocols support continued fishing or diversification into other informal livelihoods, and that COVID-19 support reaches the most vulnerable, will be critical in safeguarding the wellbeing of families in these coastal communities.

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