We wish to acknowledge a contract (WS1763368) from Pfizer Pharmaceuticals for support in this work. We would also like to thank the Saudi Arabian Ministry of Higher Education (MOHE) for their support.

1. The Exercise
<ol>
 <li>The muscle of interest for this experiment was the elbow flexors (Biceps Brachii).</li>
 <li>Muscle strength was measured for each participant to be able to give each individual an appropriate resistance. This was determined by testing each participant for their resistance maximum (RM).</li>
 <li>For testing the RM, we used a strain gauge device interfaced with a computer through a BioPac (DA-100C) bioelectric amplifier module (BioPac Systems, Goleta, CA) to measure muscle strengt...

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No conflicts of interests declared.

The primary purpose of this investigation was to assess the usefulness of thermal IR imaging in detecting and measuring muscle soreness after strenuous exercise, and our results suggest that IR imaging could be a valid technique for detecting DOMS, especially within the first 24 hours of exercising. This is not surprising, as Pennes18 provided a very detailed model of heat flow from muscle to skin in limbs. This model predicts that heat in deeper tissues such as muscles can be dissipated into blood and into th...

<table border="1">
<tbody>
 <tr>
 <td>Name of the Device</td>
 <td>Company</td>
 <td>Catalogue number</td>
 <td>Comments</td>
 </tr>
 <tr>
 <td>Infra-Red Thermal Camera</td>
 <td>FLIR</td>
 <td>FLIR SC660</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Thermal Infra-Red Analysis Software</td>
 <td>ThermoVision ExaminIR</td>
 <td>Software Version 1.10.2</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Bioelectric Amplifier Module</td>
 <td>BioPac</td>
 <td>DA100C</td>
 <td>The DA100C provides variable gain settings, and adjustable voltage references.</td>
 </tr>
 <tr>
 <td>Analog to Digital Converter Module</td>
 <td>BioPac</td>
 <td>MP100</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Automated enzyme Immunoassay Analyzer</td>
 <td>TOSOH</td>
 <td>AIA -360</td>
 <td>This device was used to analyze the blood samples, and obtain the myoglobin readings.</td>
 </tr>
 </tbody>
</table>

the use of thermal infra-red imaging to detect delayed onset muscle soreness

Delayed onset muscle soreness (DOMS), also known as exercise induced muscle damage (EIMD), is commonly experienced in individuals who have been physically inactive for prolonged periods of time, and begin with an unexpected bout of exercise1-4, but can also occur in athletes who exercise beyond their normal limits of training5. The symptoms associated with this painful phenomenon can range from slight muscle tenderness, to severe debilitating pain1,3,5. The intensity of these symptoms and the related discomfort increases within the first 24 hours following the termination of the exercise, and peaks between 24 to 72 hours post exercise1,3. For this reason, DOMS is one of the most common recurrent forms of sports injury that can affect an individual&#x2019;s performance, and become intimidating for many1,4.
For the last 3 decades, the DOMS phenomenon has gained a considerable amount of interest amongst researchers and specialists in exercise physiology, sports, and rehabilitation fields6. There has been a variety of published studies investigating this painful occurrence in regards to its underlying mechanisms, treatment interventions, and preventive strategies1-5,7-12. However, it is evident from the literature that DOMS is not an easy pathology to quantify, as there is a wide amount of variability between the measurement tools and methods used to quantify this condition6. It is obvious that no agreement has been made on one best evaluation measure for DOMS, which makes it difficult to verify whether a specific intervention really helps in decreasing the symptoms associated with this type of soreness or not. Thus, DOMS can be seen as somewhat ambiguous, because many studies depend on measuring soreness using a visual analog scale (VAS)10,13-15, which is a subjective rather than an objective measure. Even though needle biopsies of the muscle, and blood levels of myofibre proteins might be considered a gold standard to some6, large variations in some of these blood proteins have been documented 6,16, in addition to the high risks sometimes associated with invasive techniques. 
Therefore, in the current investigation, we tested a thermal infra-red (IR) imaging technique of the skin above the exercised muscle to detect the associated muscle soreness. Infra-red thermography has been used, and found to be successful in detecting different types of diseases and infections since the 1950&#x2019;s17. But surprisingly, near to nothing has been done on DOMS and changes in skin temperature. The main purpose of this investigation was to examine changes in DOMS using this safe and non-invasive technique.

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The Use of Thermal Infra-Red Imaging to Detect Delayed Onset Muscle Soreness

The purpose of this investigation was to assess whether using an infra-red thermal camera is a valid tool for detecting and quantifying the muscle soreness after exercising.

Delayed onset muscle soreness (DOMS), also known as exercise induced muscle damage (EIMD), is commonly experienced in individuals who have been physically ...

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19.1K vistas.  Loma Linda University. El propósito de esta investigación fue evaluar si el uso de una cámara térmica de infrarrojos es una herramienta válida para detectar y cuantificar el dolor muscular después del ejercicio.