1. EFFECTS OF COFFEE AND NAPS ON ANAEROBIC EXERCISE IN
COLLEGIATE VOLLEYBALL PLAYERS
Authors: Rachel Anne Arnold and Alyssa Rae Taylor Facutly Sponsor: Bruce Van Duser
Department of Health and Exercise Science Gustavus Adolphus College 800 West College Ave. St. Peter, MN 56082
Coffee nap Nap Coffee Control
Vertical Jump Average
10
10.5
11
11.5
12
12.5
13
Coffee nap Nap Coffee Control
Seconds
Conditions
T-Sprint Tests Average
STATEMENT OF PURPOSE:
The purpose of this study was to
examine the effects of consuming
caffeinated coffee, and/or taking a
nap on anaerobic exercise in
collegiate volleyball players.
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Control group
T-TEST AND VERTICAL JUMP
Trial 1 Trial 2
N=10
N=10
N=10
N=10
Figure 1. Illustration of a One- Sample group design comparing the
coffee and nap, nap, coffee, and control conditions on the T-test and
vertical jump.
RESULTS AND CONCLUSIONS
Repeated Measures ANOVA (p<.008)
No significant increase in vertical jump measurements
• Coffee and Nap 23.25 inches ± 1.36
• Nap only 23.00 inches ± 1.84
• Coffee only 22.95 inches ± 1.67
• Control 23.15 inches ± 1.72
Significant decrease in T-test running times
• Coffee and Nap 11.60 seconds ± .33
• Nap only 11.65 seconds ± .50
• Coffee only 11.66 seconds ± .50
• Control 12.10 seconds ± .45
Limitations:
o Small sample size
o Non-randomized sample selection- all being female
volleyball athletes from Gustavus Adolphus College
Future Direction:
o Other caffeinated beverages
o Performing the shuttle run, and push up test
o Recruit non-athletes
o Effects of taking a nap on endurance
Based on the results of this study, consuming caffeinated coffee,
taking a nap, or consuming caffeinated coffee and taking a nap
prior to performance enhances anaerobic performance in female
collegiate volleyball athletes.
ABSTRACT
It was reported that Coffee consumption increased alertness and provided
stronger Electroencephalographic (EEG) stimulants, which lead to more
consistent performance on activities that include focus (Horne and Reyner
1996). Taking a 30-minute nap affected Sprint times, alertness, and short-
term memory (Waterhouse et al. 2007). In order to successfully compete in
collegiate volleyball it is important to be alert and explosive. The purpose of
this study was to examine the effects of consuming caffeinated coffee
(CAF), and/or taking a nap on anaerobic exercise in collegiate volleyball
players. Ten female subjects from a Division III volleyball team
volunteered to participate in this study. A one-sample experimental design
was used to examine differences in the dependent variables of vertical jump
power (VJ) and T-sprint tests between the independent variables of control
(C), coffee only (CO), nap only (NO), or the coffee and nap (CN)
conditions. The testing sequence of treatment conditions of C, CO, NO, or
the CN conditions were randomly assigned. For the CO condition, subjects
consumed a six-ounce cup of The Original Doughnut Shop Coffee Regular
K cup of CAF 30 minutes prior to tests. The NO condition consisted of
taking a 20-minute nap and having 10 minutes of transition time to perform
tests. The CN condition consisted of consuming a 6 ounce cup of The
Original Doughnut Shop Coffee Regular K cup of CAF 30 minutes prior to
test and taking a nap for 20 minutes with a 10-minute transition time before
tests. The CO condition did not include either the nap or consumption of
coffee. The average of two trials for VJ and T- sprint tests times were
recorded. A repeated measures ANOVA (p < 0.05) and paired sample t-tests
(p < 0.008) were analyzed for significant difference in the VJ power and T-
sprint tests between the conditions. Results indicate that in the CN condition
(23.25 ± 1.36), NO condition (23.00 ± 1.84), CO condition (22.95 ± 1.67),
and Control (23.15 ± 1.72) there is no significant difference in VJ power (p
< 0.05). Results indicate a significant decrease in the T-sprint test times (p<
0.05). The paired sample t-test indicate relational significance (p< .008) in
the CN condition (11.60 ± .33), NO condition (11.65 ± .50), and CO
condition (11.66 ± .50), compared to the C condition (12.10 ± .45). Based on
results, consuming CAF and then taking a 20-minute nap, only consuming
CAF, or only taking a 20-minute nap, improves reaction time and
performance in T-sprint test times for collegiate volleyball athletes.
IRB# 1415-0100