Capacitive and resistive electric transfer (CRET) therapy can improve flexibility and increase muscle activity and may be useful as a warm-up technique. This study examined the effects of short-time CRET on jump performance. Thirty healthy men (age range
20-40?years) were randomly divided into passive (n?=?15) and active (n?=?15) warm-up groups. The participants and statisticians were blinded to the participant allocation. The passive warm-up group underwent 4?min of CRET therapy on their posterior lower legs. The active warm-up group performed stretching and jogging for 4?min. Calf muscle temperature and rebound jump (RJ) index were measured before and after the intervention. The mean (± standard deviation) muscle temperature increased by 2.0?±?0.5°C and 1.4?±?0.6°C in the passive and active warm-up groups
respectively (p?<?0.05). RJ index increased significantly in both groups (p?<?0.05). Therefore
passive warm-up using CRET may help avoid energy loss while increasing the muscle temperature in a short time when compared with traditional active warm-up techniques.
