Immediate effects of passion fruit juice supplementation on working ability and attention in healthy participants

Abstract

This study investigated the effects of a single consumption of passion fruit juice (PFJ) on working ability and attention. It included 14 healthy participants aged 20-30 years. Participants randomly consumed either placebo or 50% PFJ at 3.5 mL/kg body mass. Each intervention was divided into two phases (before and after consumption). Before consumption, the participants underwent blood glucose, blood pressure, and heart rate examinations. Then, working ability and attention were evaluated. Thereafter, the blood glucose, blood pressure, and heart rate were repeatedly examined. Next, the participants completed consumption. After consumption, the participants underwent the same experiments performed before consumption. The total working ability scores after consumption were significantly high in both interventions (P < 0.05). However, PFJ intervention had a significantly higher working ability at 1, 2, 3, 4, and 5 min than placebo intervention (P < 0.05). Moreover, PFJ intervention had greater increases in attention than placebo intervention. There were no significant differences in attention between two interventions. The blood glucose levels were significantly lower in PFJ intervention than in placebo intervention both before the working ability test and after the attention test (P < 0.05). A single consumption of PFJ improved working ability in healthy participants. This may be enhanced by improving attentional focus and maintaining postprandial blood glucose.

Keywords: Blood glucose; Brain health; Executive function; Passion fruit.

Fig. 1

CONSORT flow digram for this study.

Fig. 2

Uchida-Kraepelin scores at 1–15 min (A) and total Uchida-Kraepelin scores (B) between the placebo and passion fruit juice (PFJ) experiments before and after consumption Data were presented as mean ± standard deviation, n = 14. * Significantly different from before consumption at P < 0.05. ^# Significantly different from placebo experiment at P < 0.05.

Fig. 3

Blood glucose between the placebo and passion fruit juice experiments before and after consumption. Data were presented as mean ± standard deviation, n = 14. ^aSignificantly different from before consumption before the tests at P < 0.05. ^bSignificantly different from before consumption after the tests at P < 0.05. ^cSignificantly different from after consumption before the tests at P < 0.05. ^#Significantly different from placebo experiment at P < 0.05.