(26) THE IMPACT OF HEAT EXTRACTION FROM ONE HAND ON REPEATED JUMP PERFORMANCE IN COLLEGIATE FEMALE VOLLEYBALL PLAYERS

Background: Increased body temperature (TEMP) may alter cellular function of skeletal muscle. Heat extraction from the body may moderate body TEMP increase and preserve cellular function and delay muscle fatigue. PURPOSE: To investigate the effect of palmar cooling of one hand with a cooling device on Bosco repeated jump anaerobic test (BOSCO) performance in female National Collegiate Athletic Association (NCAA) Division I volleyball athletes.

Methods: NCAA division I female volleyball players (n=11; mean ± SD; age: 20.2 ± 1.5; height: 172.7 ± 5.2 cm; cooling weight: 69.4 ± 9.1 kg; non-cooling weight: 69.5 ± 9.1 kg), performed body composition assessment via BodPod (air plethysmography), were assessed for vertical jump and familiarized with BOSCO during the initial session. The second and third sessions, separated by 72 hours and completed in random order, players completed three 60 second BOSCOs, in either the cooling or non-cooling condition. Between BOSCOS, in the cooling condition, participants placed their hand in the cooling device while turned on; in the non-cooling condition participants placed their hand in the cooling device while turned off. Session description: 1) standardized warmup, 2) baseline lactate measurement, 3) 60-second BOSCO, 4) Seated cooling/non-cooling for 3 minutes, 5) lactate measurement, 6) rating of perceived exertion (RPE), 7) repeat steps 3-6 two more times. Also, athlete heart rate (HR) data was collected via HR monitor throughout to capture peak BOSCO HRs and recovery HRs after each BOSCO. Athletes performed the BOSCO on a force plate to record takeoff and landing forces. Two-way ANOVAs assessed differences between cooling and non-cooling treatments (p< 0.05).

Results: The two-way ANOVAs showed no interactions (simple main effects) for jumps, HR, lactate, and RPE and condition (cooling vs. non-cooling). There was a main effect for RPE (set 2 of jumps: 6.9+/-1.2 cooling and 7.8+/-1.1 non-cooling, p=0.041).

Conclusions: Treatment with palmar cooling did not improve BOSCO jump performance, HR, or lactate seen after the BOSCO in NCAA division 1 female volleyball players. There was a lower perceived exertion with palmar cooling after the second set of BOSCO. PRATICAL APPLICATIONS: There is no statistical improvement in BOSCO, HR or lactate with palmar cooling in NCAA division 1 female volleyball players, but after cooling took place (after set one of BOSCO), on average the number of jumps completed during sets 2 and 3 BOSCO (set 2 of jumps: 2.9%, set 3 of jumps: 5.8%) and the lactate after sets 2 and 3 BOSCO (set 2 of jumps: 8.8%, set 3 of jumps: 12.7%) both increased compared to non-cooling, while RPE, on average, was lower after sets 2 and 3 of cooling as compared to non-cooling.

Acknowledgements: None