## 6 Discussions
Current research also discusses theoretical modeling and simulations, alongside concerns regarding the improvement of anti-vibration materials, particularly for gloves and other protective equipment. While this review does not concentrate on these aspects, it would be worthwhile to discuss them as well. A novelty compared to the 1980s is the fact that current studies include contributions related to vibration measurements, including the development of more accurate measurement methods, such as laser vibrometers. New vibration assessment methods have been developed through biometric methods, contributing to the identification of the finger area and the vibration pressure applied by the shape of the handles or the tools used, alongside possible ergonomic considerations to improve them [39] Additionally, biometric studies have also been developed, making it possible to identify a person through these methods [34]. Papers determining the anthropometric parameters of hand-arm systems are also innovative, making major contributions to the understanding of symptoms caused by vibrations in the hand, particularly in the sanguine vessels and nervous system for the palm and fingers. Very promising contributions might be made by increasing the amount of research on the design and implementation of vibration dissipation equipment for the hand-arm system [46] (with the exception of gloves, which are continuously being researched). This is because the vibrations that are transmitted to humans in the work environment could be picked up and dissipated through this equipment, leading to the minimization of vibrations and implicitly preventing occupational diseases. Simulations are very important for this, but particularly important is the experimental component, regarding hand-arm systems. Research on this topic is quite weak, as, although many studies present theoretical, simulated, linear, and non-linear models, these are not being validated in significant proportions by practice. Currently, protective gloves are almost the only protective equipment able to dissipate mechanical vibrations transmitted to the hand (all presented devices, which are few in number, are uncomfortable either due to their materials or wearability) [25; 68]. Even gloves reduce the operator's dexterity and sense of touch while carrying out operations. A different strategy on the market involves audio-warning kits that signal the operator when the permissible limits of vibration exposure have been exceeded [9; 10]. This type of equipment can, for example, collect data via Bluetooth and transmit them to another device component of the warning kit. The advantage is that this type of protective equipment is light and maneuverable, but its disadvantages include the higher cost of purchase. Therefore, more studies using an experimental design are required to demonstrate and validate vibration-dissipating equipment for the hand-arm system in terms of functional and ergonomic factors. The majority of existing studies compare the obtained measurement values with the vibration standards [47]. Therefore, if the equipment is difficult to wear and handle, it will be avoided by the operator (as in the case of gloves [24; 25], because they reduce hand perceptivity), even if its protective aim is to minimize vibrations. In this context, the risk of transmitting large mechanical vibrations to a person will increase.