排球運動包含了發球、接發球、舉球、扣球、攔網及防守等…，如果以人體運動時的能量代謝系統來劃分，它是屬於偏無氧性的運動項目之一。特別是在劇烈運動的狀態下，粒線體的呼吸作用加速，透過氧化磷酸化反應消耗相當於安靜狀態時十倍以上的氧氣，以產生更多的ATP供給人體，但同時也產生大量的自由基。當自由基產生量過多時，對會人類中的DNA造成氧化傷害；另外在臨床研究中，也證實過多的自由基是導致許多病變如：癌症、動脈粥狀硬化、糖尿病、白內障、老化及巴金森氏症等…疾病的罹患率提高。水能載舟亦能覆舟，運動員在從事高強度的運動訓練及競賽時，應注意調整自己的訓練強度及體能狀況，並適時補充抗氧化劑以避免氧化傷害。

Volleyball activity, according to the metabolic system of energy inside human body, is one of anaerobic sporting events. At the initial state of action, respiration rate in the cellular mitochondria increases dramatically. Ten-fold amount of oxygen is required for oxidative phosphorylation to generate enough quantity of ATP to meet the energy demand for human body. During this process, more free radicals are also produced. Free radicals would induce the structural change of human DNA. Publications of clinical studies have confirmed that large amount of free radicals be the original causes of severe chronic diseases including cancer, atherosclerosis, diabetes, aging and Parkinson’s disease. Therefore, athletes, undergoing highly-competitively training exercise and top-level completion, have to pay attention to adjust the training intensity according to their own physical state and take antioxidants as a supplement to prevent any oxidant injure occurred.