| Summary: | 碩士 === 國立彰化師範大學 === 運動健康研究所 === 98 === Abstract
This study aimed to discern the difference of electromyography threshold
(EMGT), heart rate variability threshold (HRVT) and ventilation threshold (VT)
during graded exercise. In addition, correlation of the three determined thresholds and
performance of 3000m and 20m shuttle run test were also examined. 13 healthy
college males were recruited to join the experiments. At first, they completed the
healthy condition form, consent, and body composition assessment by a
bio-impedance analyzer. Later, they were subjected to perform a graded exercise on
cycle, started at 50watts (W), increased 25W per minute, and terminated when
pedaling rate below 60 rpm. The EMG signal of right thigh, intervals of heart rate,
and gas analysis were simultaneously recorded during the test. They executed a 20m
shuttle run test and a 3000m run test on separate day, respectively, for evaluating
personal aerobic capacity. The data were analyzed by pair t-test and Pearson
product-moment correlation coefficient analysis with SPSS 12.0. The level of
significance was set at p < 0.05. The results showed that EMGT and HRVT were
highly correlated with VT2 (R＝0.771, P < 0.05; R＝0.829, P < 0.05). Power at
EMGT and HRVT were significantly correlated to the performance of the 20m shuttle
run test, with R＝0.782, 0.658, respectively. Power at EMGT and HRVT are also
significantly correlated with the 3000m performance with R＝-0.555, -0.701,
respectively. According to the results, the EMGT and HRVT could be convenient and
appropriate methods for assessing aerobic-anaerobic transition and are helpful for
athletes and coaches to determine the anaerobic threshold for manipulating personal
training protocol.
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