The purpose of this study is to elucidate the work load and physical performance by the heart rate different in tennis grimes. Subjects were twelve college men and women in aged 19 to 23 yrs. Incremental exercise test were peformed on a Monark bicycle ergometer at 60 rpm. Heart rate were recorded by the heart checker system (BP-40). Oxygen uptake was measured by Douglas bag and scholander gas analyser method. The conculusions of this study were as follows: 1. Maximum oxygen uptake during incremental ergometer exercise in men and women indicated 59.1 ㎖/㎎/min and 42.5 ㎖/㎎/min, respectively. Anaerobic threshold (AT-VO₂) during incremental ergometer exercise showed 1.65 and 1.04 ℓ/min and AT-% VO₂max were 43.0 and 44.4%, respectively. 2. Mean heart rate at Single match tennis games in men and women were 145.1 beats/min (58% VO₂ max) and 146.7 beats/min (62.2% VO₂max), respectively. It is suggested that these mean heart rate ware 79.3% HR max and 79.4% HR max. 3. Mean heart rate in receiver and servicer showed 147.5 beats/min, 142.7 beats/min, and 147.2 beats/min, 146.2 beats/min, respectively in men and women. It is suggested that the heart rate in Servicer were higher than receiver in slightly.