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J Eur Acad Dermatol Venereol. 2018 Nov;32(11):2020-2024. doi: 10.1111/jdv.14966. Epub 2018 May 18.

Skin temperature in youth soccer players with functional equinus and non-equinus condition after running.

Author information

Faculty of Sport Sciences, Universidad Europea de Madrid, Madrid, Spain.
Faculty of Health Sciences, Universidad Rey Juan Carlos, Madrid, Spain.
Facultad de Enfermeria, Fisioterapia y Podologia, Universidad Complutense de Madrid, Madrid, Spain.
University Center of Plasencia, Universidad de Extremadura, Plasencia, Spain.
Departamento de Fisioterapia, Centro Superior de Estudios Universitarios La Salle, Universidad Autónoma de Madrid, Madrid, Spain.
Motion in Brains Research Group, Institute of Neuroscience and Movement Sciences (INCIMOV), Centro Superior de Estudios Universitarios La Salle, Universidad Autonóma de Madrid, Madrid, Spain.
Nursing and Physical Therapy Department, Institute of Biomedicine (IBIOMED), Universidad de León, Ponferrada, León, Spain.
Department of Nursing and Podiatry, Faculty of Medicine, Universidad Miguel Hernandez de Elche, Valencia, Spain.
Department of Nursing and Podiatry, Faculty of Medicine, Faculty of Nursing and Podiatry, University of Valencia, Valencia, Spain.
Research, Health and Podiatry Unit, Department of Health Sciences, Faculty of Nursing and Podiatry, Universidade da Coruña, Ferrol, Spain.



To check how a thermal IR camera can check skin temperature in gastrocnemius-soleus equinus condition and non-gastrocnemius-soleus condition in youth soccer players and thus detect association between the extensibility of the triceps surae (with gastrocnemius-soleus equinus and non-gastrocnemius-soleus equinus) and the muscle temperature pattern.


A cross-sectional study secondary level of care.


Sample from an elite soccer academy in Madrid (Spain) 35 healthy male subjects (youth soccer players) age 12.82 ± 1.07 years, height 158.68 ± 10.79 cm, weight 49.19 ± 9.45 kg, body mass index 19.41 ± 2.25. The exclusion criteria were the presence of musculoskeletal and joint injuries, pelvic pain, ankle sprains, low back pain and use of drugs in the previous week, and scoliosis.


Temperature value for gastrocnemius muscles and Achilles tendon were assessed in 35 youth soccer players from an academia before and after training in both 12 gastrocnemius-soleus equinus and 23 non-gastrocnemius-soleus equinus soccer players conditions. State absolute for gastrocnemius soleus condition obtained a 0.34 value (0.19-0.5); we found a significant increase in temperature among these conditions for the gastrocnemius (P = 0.028) and the Achilles tendon (P = 0.007) (confidence interval 95%). The temperature of gastrocnemius-soleus equinus for gastrocnemius and Achilles tendon was increased more than non-gastrocnemius-soleus equinus in youth soccer players.


IR imaging captured temperature is associated with muscle pattern activation for lower limb. Based on our findings, we propose that infrared thermography evaluation of the gastrocnemius and Achilles tendon is suitable to differ gastrocnemius-soleus equinus and non-gastrocnemius-soleus equinus conditions in youth soccer players.


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