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Effects of leg covering in humans on muscle activity and thermal responses in a cool environment

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Abstract

Thermal responses and muscle performance in humans were studied during rest and exercise in a cool environment with different clothing distributions over the legs. Nine female subjects were exposed to 5°C wearing shorts (SS), trousers with long legs (LL) or trousers with one long leg and one short leg (LS: LSc covered leg, LSu uncovered leg). The subjects also wore T-shirts and long-sleeved shirts. The subjects were seated for 60 min and after this they performed light stepping exercise for a further 60 min. Rectal temperature (T re) and skin temperature from seven (LL, SS) or nine sites (LS) were measured continuously. Surface electromyography (EMG) from three muscles (biceps femoris, gastrocnemius and tibialis anterior) were recorded during the exercise from six subjects. Integrated EMG (iEMG) and mean power frequency (MPF) were used to describe muscle activity. The T re was virtually unchanged during rest in every ensemble, whereas during exercise T re was significantly lower in SS than in LL. Mean skin temperature \(\left( {\bar T_{{\text{sk}}} } \right)\) decreased during rest in every ensemble, being significantly lower in SS than in LL. After the rest period local T sk of thigh and calf were significantly lower in SS than in LL and they were also lower in LSu than in LSc. At the beginning of the exercise the iEMG of the tibialis anterior muscle in SS and LL averaged 84 (SEM 7) and 64 (SEM 3) μV (P < 0.05), respectively. Respective values for LSu and LSc were 86 (SEM 9) and 66 (SEM 6) μV (P < 0.05). The MPF of the tibialis anterior muscle was significantly higher in LL 102 (SEM 5) Hz than in SS 90 (SEM 5) Hz (P < 0.05) and similarly the MPF of the gastrocnemius muscle was also higher in LL 111 (SEM 5) Hz than in SS 100 (SEM 5) Hz (P < 0.05). It was concluded that exposing bare legs to a cool environment enhanced the motor unit activity in relation to covered legs. This would suggest that wearing shorts in a cool environment may, at the beginning of exercise, result in higher (about 25%) EMG activity and this may reflect increased muscle strain in comparison with wearing long trousers. Our results showing a unilateral increase in EMG activity during unilateral cooling suggest that the increase of strain is restricted to the uncovered part of the limb.

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References

  • Beelen A, Sargeant AJ (1991) Effect of lowered muscle temperature on the physiological response to exercise in men. Eur J Appl Physiol 63:387–392

    Google Scholar 

  • Bell DG (1993) The influence of air temperature on the EMG/force relationship of the quadriceps. Eur J Appl Physiol 67:256–260

    Google Scholar 

  • Bergh U, Ekblom B (1979) Influence of muscle temperature on maximal muscle strength and power output in human skeletal muscles. Acta Physiol Scand 107:33–37

    PubMed  Google Scholar 

  • Bigland-Ritchie B, Thomas CK, Rice CL, Howarth JV, Woods JJ (1992) Muscle temperature, contractile speed, and motoneuron firing rates during human voluntary contractions. J Appl Physiol 73:2457–2461

    PubMed  Google Scholar 

  • De Luca CJ (1979) Physiology and mathematics of myoelectric signals. IEEE Trans Biomed Eng 26:313–325

    PubMed  Google Scholar 

  • Faulkner JA, Zerba E, Brooks SV (1990) Muscle temperature of mammals: cooling impairs most functional properties. Am J Physiol 259:R259-R265

    PubMed  Google Scholar 

  • Franssen H, Wieneke GH (1994) Nerve conduction and temperature: necessary warming time. Muscle Nerve 17:336–344

    PubMed  Google Scholar 

  • Holewijn M, Heus R (1992) Effects of temperature on electromyogram and muscle function. Eur J Appl Physiol 65:541–545

    Google Scholar 

  • Hopf HC, Maurer K (1990) Temperature dependence of the electrical and mechanical responses of the adductor pollicis muscle in humans. Muscle Nerve 13:259–262

    PubMed  Google Scholar 

  • Jeong WS, Tokura H (1988) Effects of wearing two different forms of garment on thermoregulation in men resting at 10°C. Eur J Appl Physiol 57:627–631

    Google Scholar 

  • Lange-Andersen K, Rutenfranz J, Masironi R, Seliger V (1978) Habitual physical activity and health. WHO Regional Publications, European Series no. 6. World Health Organization, Copenhagen

    Google Scholar 

  • Mitchell D, Wyndham CH (1969) Comparison of weighting formulas for calculating mean skin temperatures. J Appl Physiol 26:616–622

    PubMed  Google Scholar 

  • Moritani T, Sherman WM, Shibata M, Matsumoto T, Shinobara M (1992) Oxygen availability and motor unit activity in humans. Eur J Appl Physiol 64:552–556

    Google Scholar 

  • Nielsen R, Nielsen B (1984) Influence of skin temperature distribution on thermal sensation in a cool environment. Eur J Appl Physiol 53:225–230

    Google Scholar 

  • Olesen BW, Dukes-Dubos FN (1988) International standards for assessing the effect of clothing on heat tolerance and comfort. In: Mansdorf SZ, Sager R, Nielson AP (eds) Performance of protective clothing. ASTM, Philadelphia, pp 17–30

    Google Scholar 

  • Petrofsky JS, Lind AR (1980) The influence of temperature on the amplitude and frequency components of the EMG during brief and sustained isometric contractions. Eur J Appl Physiol 44:189–200

    Google Scholar 

  • Pierotti SE, Brand RA, Gabel RH, Pedersen DR, Clarke WR (1991) Are leg electromyogram profiles symmetrical? J Orthop Res 9:720–729

    PubMed  Google Scholar 

  • Ricker K, Hertel G, Stodieck G (1977) Increased voltage of the muscle action potential of normal subjects after local cooling. J Neurol 216:33–38

    Article  PubMed  Google Scholar 

  • Rome LC (1990) Influence of temperature on muscle recruitment and muscle function in vivo. Am J Physiol 259:R210-R222

    PubMed  Google Scholar 

  • Rowell LB (1974) Human cardiovascular adjustments to exercise and thermal stress. Physiol Rev 54:75–159

    PubMed  Google Scholar 

  • Sargeant AJ (1987) Effect of muscle temperature on leg extension force and short-term output in humans. Eur J Physiol 56:693–698

    Google Scholar 

  • Winkel J, Jørgensen K (1991) Significance of skin temperature changes in surface electromyography. Eur J Appl Physiol 63:345–348

    Google Scholar 

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Rissanen, S., Oksa, J., Rintamäki, H. et al. Effects of leg covering in humans on muscle activity and thermal responses in a cool environment. Europ. J. Appl. Physiol. 73, 163–168 (1996). https://doi.org/10.1007/BF00262826

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