This study investigates the effects of cooling on the recovery and performance characteristic in young healthy subjects. The study is divided in two projects: Project A: investigates the effects of 20 min. post-exercise cooling on vertical jump performance and delayed onset muscle soreness and rated perceived exertion. Project B: investigates the effects of 20 min. pre-exercise cooling on maximal voluntary contraction of the right M. quadriceps femoris and delayed onset muscle soreness and rated perceived exertion.
The aim of this study is to investigate the effects of a 20 min. external cooling application (+8°C ) versus a external thermo neutral application (+32°C) up to 72 hours post application. The study is divided in two projects: Project A: This study is focusing on the recovery process after a max. jump performance (3x30 counter movement jumps). Directly after the exercise subjects receive a cooling or thermo-neutral application. Recovery characteristics measured by vertical jump performance (objective) and delayed onset muscle soreness and rated perceived exertion (subjective) are measured in function of time up to 72 hours post cooling intervention. Project B: This study is focusing on the effect of 20 min. cooling or thermo-neutral application on the M. quadriceps femoris performance (MVC). After the thermo-application, the 60% endurance MVC is measured by means of surface EMG (OT Bioelettronica 10-750 Hz) in a ergometer chair 90° degrees knee flexion (Cor 1 Bioelettronica). Muscle conduction velocity, MVC (objective), delayed onset muscle soreness and rated perceived exertion (subjective) are measured in function of time up to 72 hours post thermo-application.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
TRIPLE
Enrollment
22
Zamar Therapy is a certified medical product (directive 93/42/EEC and ISO 134 85:2012) (www.zamarmedical.com)
University of Applied Sciences and Arts of Southern Switzerland SUPSI
Landquart, Kanton Graubünden, Switzerland
Delayed-onset Muscle Soreness (DOMS)
The subjective recovery characteristics "Delayed-onset muscle soreness (DOMS)" was rated on a 0-10 cm visual analog scale. DOMS was assessed in a squat position (90° knee angle, with brief holding of maximum 3 seconds) ranging from zero (no soreness) to ten (severe soreness). Higher values mean mean more DOMS and therefore less recovery.
Time frame: 72 hours
Ratings of Perceived Exertion (RPE)
The subjective recovery characteristics " Ratings of perceived exertion (RPE)" was rated on a 6-20 Borg scale (from 6 = "no exertion at all" to 20 = "Maximal exertion") in a standing position. The higher value means more exertion and therefore less recovery.
Time frame: 72 hours
Vertical Jump Performance (VJP)
Vertical jump performance (VJP) was assessed performing three maximal counter mouvemet jumps (CMJs) with a 30-second pause between the three jumps on the Just Jump system (Probotics Inc, Huntsville, AL, USA). The highest jump was recorded.
Time frame: 72 hours
Peak Power Output (PPO)
Peak power output (PPO) was assessed performing three maximal counter movement jumps (CMJs) on the Just Jump system (Probotics Inc, Huntsville, AL, USA) with a 30-second pause between the three jumps. PPO (presented in watts) was calculated.
Time frame: 72 hours
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