2007, Piran, Slovenia

Water intake(g)
2000
1800
1600
1400
1200
1000
Y=X
800
600
Y=0.286x+490.28
400
200
r=0.501
0
0 1000 2000 3000 4000
Sweat rate(g)
Figure 2: Relationship between the total amount of sweating
and water intake during the entire practice period
Osmotic Pressure(mOsm/ )
Uric acid(mg/d )
HR(beat/min)
302
300
298
296
294
292
290
288
286
284
6
5
4
3
2
1
0
Before
Before
**
**
After
After After
**P < 0.01
Myoglobin(ng/m )
BUN(mg/d )
200
180
160
Startof practice
140
120
100
Muscle
training
80
60
40
20
Dashes Resting Baseball practice
0
13:30 1:30 14:00 2:00 14:30 2:30 15:00 3:00 15:30 3:30 16:00 4:00 16:30 4:30
Time
Figure 4: Changes in the heart rate of a subject during the
baseball practice period
70
60
50
40
30
20
10
0
20
20
18
18
16
16
14
14
12
12
10
10
8
8
6
6
4
4
2
2
0
0
Before
Before
**
**
After
After
After
After
Figure 3: Osmotic pressure, and myoglobin, uric acid, and
BUN levels before and after baseball practice
Non-thermal factors
differences in RBC, Hb, Ht,
MCV, MCH, MCHC, and
platelet levels between
before and after practice.
Figure 2 shows the
relationship between sweat
rate and water intake during
the entire practice period.
Figure 3 shows the osmotic
pressure, and myoglobin,
uric acid, and BUN levels
before and after practice.
The osmotic pressure was
significantly higher after
than before practice (p <
0.01). The blood
concentrations of
myoglobin, uric acid, and
BUN were also significantly
higher after than before
practice.
Figure 4 shows the changes
in heart rate of a subject.
Child B started the practice
at 13:50, and continued for
3 hours. In this baseball
team, skeletal muscle
training, such as dashes and
abdominal exercises, was
performed early after the
start of practice.
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