Repeated mouth rinsing of coffee improves the specific-endurance performance and jump performance of young male futsal players

Figures & data

Figure 1. Study design and allocation of participants to four experimental conditions for each trial. LDC: low dose coffee. HDC: High dose coffee, PLA: Placebo, CON: Control.

Figure 2. Supplementation and testing protocol FIET. FIET: futsal intermittent endurance test, VAS: visual analogue scale, Baseline-CMR: Baseline CMR, IA-FIET: immediately after the FIET, 5”A-FIET: 5 minutes after the FIET, 10”A-FIET: 10 minutes after the FIET.

Table 1. The functional variables (mean ± standard deviation) measured in the four different experimental conditions.

Variables	CON	PLA	LDC	HDC
FIET (m)	1327.5 ± 176.5	1439.8 ± 236.3	1494.4 ± 220	1677.7 ± 206.1
VAS (Baseline) (mm)	7.4 ± 4.6	9.6 ± 5.2	9.2 ± 4.9	8 ± 2.6
VAS (IA-FIET) (mm)	94.2 ± 5.8	90.5 ± 6.7	93.2 ± 5.1	91.5 ± 3.9
VAS (5’A-FIET) (mm)	57.1 ± 9.5	52.3 ± 8.2	54.5 ± 9.7	54.8 ± 6.9
VAS (10’A-FIET) (mm)	39.1 ± 10.8	32.7 ± 10.7	33.6 ± 10.5	34.7 ± 13.6
VJH (Baseline) (cm)	44.5 ± 3.9	44.7 ± 4.1	45.2 ± 4.2	45.1 ± 3.6
VJH (Baseline-CMR) (cm)	44.3 ± 4.2	46.4 ± 4.2	47.4 ± 3.3	48.5 ± 3.2
VJH (IA-FIET) (cm)	41.6 ± 4.3	44 ± 4.2	45.1 ± 4.8	45.8 ± 4.6
VJH (5’A-FIET) (cm)	44 ± 4.5	47.8 ± 5.1	49.6 ± 4.8	50.8 ± 4.4
VJH (10’A-FIET) (cm)	45.2 ± 4.5	48.3 ± 4.1	49.3 ± 4.1	51.1 ± 3.6

Baseline-CMR: Baseline coffee mouth-rinsing, FIET: Futsal intermittent endurance test, IA-FIET: immediately after the FIET, 5”A-FIET: 5 minutes after the FIET, 10”A-FIET: 10 minutes after the FIET, LDC: low dose coffee. HDC: High dose coffee, PLA: Placebo, CON: Control. VAS: visual analogue scale, VJH: vertical height jump.

Figure 3. Performance of participants in the FIET. LDC: low dose coffee. HDC: High dose coffee, PLA: Placebo, CON: Control. FIET: Futsal intermittent endurance test. C Significant difference compared to control condition (P < 0.05); L Significant difference compared to LDC (P < 0.05). P Significant difference compared to PLA (P < 0.05).

Figure 4. Vertical jump height of participants in different conditions. Baseline: Nutritional intervention has not been done, Baseline-CMR: Baseline coffee mouth-rinsing, FIET: Futsal intermittent endurance test, IA-FIET: immediately after the FIET, 5”A-FIET: 5 minutes after the FIET, 10”A-FIET: 10 minutes after the FIET, LDC: low dose coffee. HDC: High dose coffee, PLA: Placebo, CON: Control. * Significant difference compared to Baseline (P < 0.05)),† Significant difference compared to baseline-CMR (P < 0.05), # Significant difference compared to IA-FIET (P < 0.05 C Significant difference compared to CON (P < 0.05), L Significant difference compared to LDC (P < 0.05). P Significant difference compared to PLA (P < 0.05).

Table 2. Comparison of time series of perceived fatigue and vertical jump height in four experimental conditions.

variables	Time 1	Time 2	CON		PLA		LDC		HDC
			sig	95% CI	sig	95% CI	sig	95% CI	sig	95% CI
Perceived fatigue	Baseline	IA-FIET	0.000	82.7–90.7	0.000	75.9–85.8	0.000	80–87.9	0.000	80.7–86.2
		5’A-FIET	0.000	42.8–56.5	0.000	37.4–48	0.000	39.5–51	0.000	42.9–50.8
		10’A-FIET	0.000	25.2–38.1	0.000	16.9–29.4	0.000	18.7–30.1	0.000	19.4–34
	IA-FIET	5’A-FIET	0.000	31.2–43	0.000	32.5–43.8	0.000	32.3–45	0.000	31.8–41.5
		10’A-FIET	0.000	48–62.3	0.000	50.6–64.8	0.000	52.3–66.9	0.000	48.1–65.6
	5’A-FIET	10’A-FIET	0.000	12.4–23.7	0.000	14.9–24.2	0.000	15.7–26.1	0.000	14.9–25.4
Vertical jump height	Baseline	Baseline-CMR	0.999	0.3–0.5	0.003	0.5–3	0.002	0.7–3.8	0.000	2–4.7
		IA-FIET	0.001	09–4.9	0.999	1.9–3.3	0.999	2.4–2.6	0.999	1.6–3.2
		5’A-FIET	0.999	2.2–2.9	0.007	0.7–5.6	0.000	1.8–7.5	0.000	3.6–7.9
		10’A-FIET	0.999	2–3.5	0.003	1–6.2	0.001	1.4–6.7	0.000	3.8–8.2
	Baseline-CMR	IA-FIET	0.002	0.8–4.8	0.051	0.01–4.8	0.17	0.5–5.2	0.02	0.3–4.9
		5’A-FIET	0.999	2.1–2.8	0.70	0.9–3.6	0.17	0.4–4.8	0.02	0.2–4.4
		10’A-FIET	0.999	0.6–4.5	0.40	0.8–4.5	0.42	0.8–4.6	0.005	0.6–4.5
	IA-FIET	5’A-FIET	0.000	1.9–3.5	0.000	2–5.5	0.000	2.9–6.1	0.000	3.5–6.4
		10’A-FIET	0.000	1.7–5.6	0.000	2.5–6.1	0.000	2.2–6.2	0.000	3–7.4
	5’A-FIET	10’A-FIET	0.17	0.2–2.6	0.999	1.6–2.6	0.999	1.6–2.2	0.999	1.2–1.7

Baseline-CMR: Baseline coffee mouth-rinsing, FIET: Futsal intermittent endurance test, IA-FIET: immediately after the FIET, 5”A-FIET: 5 minutes after the FIET, 10”A-FIET: 10 minutes after the FIET, LDC: low dose coffee. HDC: High dose coffee, PLA: Placebo, CON: Control.

Figure 5. Perceived fatigue (measured by VAS) of participants in different conditions. IA-FIET: immediately after FIET, 5”A-FEIT: 5 min after FIET, 10”AF: 10 min after FIET. LDC: low dose coffee, HDC: High dose coffee, PLA: Placebo, CON: Control. * Significant difference compared to Baseline (P < 0.05), # Significant difference compared to IA-FIET (P < 0.05), $ Significant difference compared to 5’A-FEIT (P < 0.05).