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Nutrients. 2017 May 29;9(6). pii: E556. doi: 10.3390/nu9060556.

Blackcurrant Alters Physiological Responses and Femoral Artery Diameter during Sustained Isometric Contraction.

Author information

1
Department of Sport & Exercise Sciences, University of Chichester, College Lane, Chichester PO19 6PE, UK. matthew.cook@worc.ac.uk.
2
Institute of Sport and Exercise Science, University of Worcester, Henwick Grove, Worcester WR2 6AJ, UK. matthew.cook@worc.ac.uk.
3
Department of Sport & Exercise Sciences, University of Chichester, College Lane, Chichester PO19 6PE, UK. s.myers@chi.ac.uk.
4
Department of Sport & Exercise Sciences, University of Chichester, College Lane, Chichester PO19 6PE, UK. m.gault@chi.ac.uk.
5
Department of Sport & Exercise Sciences, University of Chichester, College Lane, Chichester PO19 6PE, UK. m.willems@chi.ac.uk.

Abstract

Blackcurrant is rich in anthocyanins that may affect exercise-induced physiological responses. We examined tissue oxygen saturation, muscle activity, cardiovascular responses and femoral artery diameter during a submaximal sustained isometric contraction. In a randomised, double-blind, crossover design, healthy men (n = 13, age: 25 ± 4 years, BMI: 25 ± 3 kg·m-2, mean ± SD) ingested New Zealand blackcurrant (NZBC) extract (600 mg∙day-1 CurraNZ™) or placebo (PL) for 7-days separated by 14-days washout. Participants produced isometric maximal voluntary contractions (iMVC) and a 120-s 30%iMVC of the quadriceps with electromyography (EMG), near-infrared spectroscopy, hemodynamic and ultrasound recordings. There was no effect of NZBC extract on iMVC (NZBC: 654 ± 73, PL: 650 ± 78 N). During the 30%iMVC with NZBC extract, total peripheral resistance, systolic, diastolic, and mean arterial pressure were lower with increased cardiac output and stroke volume. With NZBC extract, EMG root mean square of the vastusmedialis and muscle oxygen saturation were lower with higher total haemoglobin. During the 30%iMVC, femoral artery diameter was increased with NZBC extract at 30 (6.9%), 60 (8.2%), 90 (7.7%) and 120 s (6.0%). Intake of NZBC extract for 7-days altered cardiovascular responses, muscle oxygen saturation, muscle activity and femoral artery diameter during a 120-s 30%iMVC of the quadriceps. The present study provides insight into the potential mechanisms for enhanced exercise performance with intake of blackcurrant.

KEYWORDS:

New Zealand blackcurrant; anthocyanins; blood flow; cardiovascular function; electromyography; exercise; isometric contraction; ultrasound

PMID:
28555052
PMCID:
PMC5490535
DOI:
10.3390/nu9060556
[Indexed for MEDLINE]
Free PMC Article

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