Evaluation of the impact of muscle relaxation techniques on recovery in sport

INTERVENTION: The experiment will be carried out according to a randomized crossover design where each participant conducts a familiarization intervention with contrast therapy ice massage and 1‐minute nautical massage for the thigh muscles and forearm muscles. A total of 100 volunteers submitted by MMA trainers in accordance with the inclusion and exclusion criteria will be randomly divided into two and four groups and subjected to various methods of physical and manual muscle relaxation in the sacral system. Using simple randomisation methods, athletes will be assigned to groups by random selection with the website https://www.randomizer.org/. Participants will not know which group they have been assigned to. The implementation of the intervention is planned at Centrum Medyczne Provita, which is a clinical facility registered by the relevant authorities and subject to national regulations. Before the intervention, the subjects will undergo resting measurements, followed by a fatigue test. The fatigue test will consist of performing plyometric jumps to the refusal of effort on a bo X45‐50 cm high, with a break between sets of 1 minute. The number of series is 5. Before the start of the test, the athletes will perform a properly planned warm‐up. During the examination of the participants' health, it is controlled by a paramedic, the measurements will be made by properly trained students, and the entire application of the intervention is managed by the project manager, Dr Robert Trybulski, PT. Other project participants at the stage of data preparation and publication are: coordinator ‐ head of research dr kf ‐ physiotherapist Robert Trybulski ‐ assistant professor at the University of Upper Silesia Dr. hab. n. kf. Michal Wilk ‐ Professor of the Academy of Physical Education in Kato CONDITION: Post‐workout recovery in athletes ; Not Applicable PRIMARY OUTCOME: Measured at rest, 5 minutes, 24 and 48 hours after the exercise test:; 1. Muscle tone (F = Hz), stiffness (S = N/m), flexibility and relaxation (ms) measured with a myotonometer (MyotonPRO AS, Myoton Ltd, Estonia 2021); 2. Muscle strength (W) measured with a hand dynamometer (EH106 China 2020); 3. Perfusion Units (PU) measured with a Laser Doppler Flowmeter (LDF), (Perimed, Sweden 2004); 4. Muscle power (Relative Strength Index [RSI]) measured behind the measurement platform Strength Decks (Vald Performance Australia 2012) or Fmax measured with an electronic hand dynamometer (EH106 China) 2020 SECONDARY OUTCOME: Measured at rest, 1‐5 minutes before the intervention and 1‐5 minutes after the intervention, 24 hours and 48 hours:; 1. Muscle pain threshold (PT‐kG or N) measured with the FDI Xalgesimeter (Wagner Instruments, Greenwich, CT, USA 2013); 2. Number of jumps made, counted during each exercise test; 3. Arterial pressure and pulse measured with an electronic blood pressure monitor before and after the exercise test INCLUSION CRITERIA: 1. Randomly selected athletes with at least 3 years of training experience training min. 4 times a week 2. Aged 18‐40 years 3. Healthy men