Abstract
This study investigated the effect of hot conditions on repeated sprint cycling performance and post-exercise alterations in isometric knee extension function. Twelve physically active participants performed 10 × 6-s “all-out” sprints on a cycle ergometer (recovery = 30 s), followed 6 min later by 5 × 6-s sprints (recovery = 30 s) in either a neutral (24 °C/30 %rH) or a hot (35 °C/40 %rH) environment. Neuromuscular tests including voluntary and electrically evoked isometric contractions of the knee extensors were performed before and after exercise. Average core temperature during exercise was higher (38.0 ± 0.1 vs. 37.7 ± 0.1 °C, respectively; P < 0.05) in hot versus neutral environments. Peak power output decreased (−17.9 % from sprint 1 to sprint 10 and −17.0 % from sprint 11 to sprint 15; P < 0.001) across repetitions. Average peak power output during the first ten sprints was higher (+3.1 %; P < 0.01) in the hot ambient temperature condition. Maximal strength (−12 %) and rate of force development (−15 to −26 %, 30–200 ms from the onset of contraction) decreased (P < 0.001) during brief contractions after exercise, irrespectively of the ambient temperature. During brief maximal contractions, changes in voluntary activation (~80 %) were not affected by exercise or temperature. Voluntary activation declined (P < 0.01) during the sustained contraction, with these reductions being more pronounced (P < 0.05) after exercise but not affected by the ambient temperature. Resting twitch amplitude declined (P < 0.001) by ~42 %, independently of the ambient temperature. In conclusion, heat exposure has no effect on the pattern and the extent of isometric knee extensor fatigue following repeated cycling sprints in the absence of hyperthermia.
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References
Aagaard P, Simonsen EB, Andersen JL, Magnusson P, Dyhre-Poulsen P (2002) Increased rate of force development and neural drive of human skeletal muscle following resistance training. J Appl Physiol 93(4):1318–1326
Akima H, Kinugasa R, Kuno S (2005) Recruitment of the thigh muscles during sprint cycling by muscle functional magnetic resonance imaging. Int J Sports Med 26(4):245–252
Allen DG, Lamb GD, Westerblad H (2008) Skeletal muscle fatigue: cellular mechanisms. Physiol Rev 88:287–332
Allen GM, McKenzie DK, Gandevia SC (1998) Twitch interpolation of the elbow flexor muscles at high forces. Muscle Nerve 21(3):318–328
Almudheki F, Girard O, Grantham J, Racinais S (2011) Hot ambient conditions do not alter intermittent cycling sprint performance. J Sci Med Sport. doi:10.1016/j.jsams.2011.07.009
Andersen LL, Aagaard P (2006) Influence of maximal muscle strength and intrinsic muscle contractile properties on contractile rate of force development. Eur J Appl Physiol 96(1):46–52
Backx K, McNaughton L, Crickmore L, Palmer G, Carlisle A (2000) Effects of differing heat and humidity on the performance and recovery from multiple high intensity, intermittent exercise bouts. Int J Sports Med 21(6):400–405
Bergh U, Ekblom B (1979) Influence of muscle temperature on maximal muscle strength and power output in human skeletal muscles. Acta Physiol Scand 107(1):33–37
Billaut F, Basset FA, Giacomoni M, Lemaitre F, Tricot V, Falgairette G (2006) Effect of high-intensity intermittent cycling sprints on neuromuscular activity. Int J Sports Med 27(1):25–30
Binkhorst RA, Hoofd L, Vissers AC (1977) Temperature and force–velocity relationship of human muscle. J Appl Physiol 42(4):471–478
Bishop D (2003) Warm up I. Potential mechanisms and the effects of passive warm up on exercise performance. Sports Med 33(6):439–454
Bishop D, Lawrence S, Spencer M (2003) Predictors of repeated-sprint ability in elite female hockey players. J Sci Med Sport 6(2):199–209
Bojsen-Moller J, Magnusson SP, Rasmussen LR, Kjaer M, Aagaard P (2005) Muscle performance during maximal isometric and dynamic contractions is influenced by the stiffness of the tendinous structures. J Appl Physiol 99:986–994
Cohen J (1988) Statistical power analysis for the behavioural sciences. 2nd edn. Hillsdale (NJ): Lawrence Erlbaum Associates, p. 567
De Haan A, Gerrits KH, de Ruiter CJ (2009) Counterpoint: the interpolated twitch does not provide a valid measure of the voluntary activation of muscle. J Appl Physiol 107:355–357
Dewhurst S, Macaluso A, Gizzi L, Felici F, Farina D, De Vito G (2010) Effects of altered muscle temperature on neuromuscular properties in young and older women. Eur J Appl Physiol 108(3):451–455
Ditroilo M, Watsford M, Fernández-Peña E, D’Amen G, Lucertini F, De Vito G (2011) Effects of fatigue on muscle stiffness and intermittent sprinting during cycling. Med Sci Sports Exerc 43(5):837–845
Drust B, Rasmussen P, Mohr M, Nielsen B, Nybo L (2005) Elevations in core and muscle temperature impairs repeated sprint performance. Acta Physiol Scand 183(2):181–190
Duffield R, King M, Skein M (2009) Recovery of voluntary and evoked muscle performance following intermittent-sprint exercise in the heat. Int J Sports Physiol Perform 4:254–268
Falk B, Radom-Isaac S, Hoffmann JR, Wang Y, Yarom Y, Magazanik A, Weinstein Y (1998) The effect of heat exposure on performance of and recovery from high-intensity, intermittent exercise. Int J Sports Med 19(1):1–6
Farina D, Merletti R, Enoka RM (2004) The extraction of neural strategies from the surface EMG. J Appl Physiol 96(4):1486–1495
Gaitanos GC, Williams LH, Boobis H, Brooks S (1993) Human muscle metabolism during intermittent maximal exercise. J Appl Physiol 75(2):712–719
Gaoua N, Grantham J, El Massioui F, Girard O, Racinais S (2011) Cognitive decrements do not follow neuromuscular alterations during passive heat exposure. Int J Hyperthermia 27(1):10–19
Girard O, Mendez-Villanueva A, Bishop D (2011) Repeated-sprint ability—Part 1. Factors contributing to fatigue. Sports Med 41(8):673–694
Goodall S, Ross EZ, Romer LM (2010) Effect of graded hypoxia on supraspinal contributions to fatigue with unilateral knee-extensor contractions. J Appl Physiol 109(6):1842–1851
Gray SR, De Vito G, Nimmo MA, Farina D, Ferguson RA (2006) Skeletal muscle ATP turnover and muscle fiber conduction velocity are elevated at higher muscle temperatures during maximal power output development in humans. Am J Physiol Regul Integr Comp Physiol 290(2):R376–R382
Linnane DM, Bracken RM, Brooks S, Cox VM, Ball D (2004) Effects of hyperthermia on the metabolic responses to repeated high-intensity exercise. Eur J Appl Physiol 93(1–2):159–166
McKenzie JE, Osgood DW (2004) Validation of a new telemetric core temperature monitor. J Thermal Biol 29:605–611
Mendez-Villanueva A, Hamer P, Bishop D (2007) Fatigue responses during repeated sprints matched for initial mechanical output. Med Sci Sports Exerc 39(12):2219–2225
Mendez-Villanueva A, Hamer P, Bishop D (2008) Fatigue in repeated-sprint exercise is related to muscle power factors and reduced neuromuscular activity. Eur J Appl Physiol 103(4):411–419
Nybo L, Nielsen B (2001) Hyperthermia and central fatigue during prolonged exercise in humans. J Appl Physiol 91(3):1055–1060
Perrey S, Racinais S, Saimouaa K, Girard O (2010) Neural and muscular adjustments following repeated running sprints. Eur J Appl Physiol 109(6):1027–1036
Place N, Maffiuletti N, Martin A, Lepers R (2007) Assessment of the reliability of central and peripheral fatigue after sustained maximal voluntary contraction of the quadriceps muscle. Muscle Nerve 35(4):486–495
Racinais S, Girard O (2012) Neuromuscular failure is unlikely to explain the early exercise cessation in hot ambient conditions. Psychophysiology. doi:10.1111/j.1469-8986.2012.01360.x
Racinais S, Oksa J (2010) Temperature and neuromuscular function. Scand J Med Sci Sports 20(3):1–18
Racinais S, Bishop D, Denis R, Lattier G, Mendez-Villaneuva A, Perrey S (2007) Muscle deoxygenation and neural drive to the muscle during repeated sprint cycling. Med Sci Sports Exerc 39(2):268–274
Racinais S, Gaoua N, Grantham J (2008) Hyperthermia impairs short-term memory and peripheral motor drive transmission. J Physiol 586(Pt19):4751–4762
Rutkove SB (2001) Effects of temperature on neuromuscular electro-physiology. Muscle Nerve 24:867–882
Sargeant AJ (1987) Effect of muscle temperature on leg extension force and short-term power output in humans. Eur J Appl Physiol Occup Physiol 56(6):693–698
Sidhu SK, Bentley DJ, Carroll TJ (2009) Locomotor exercise induces long-lasting impairments in the capacity of the human motor cortex to voluntarily activate knee extensor muscles. J Appl Physiol 106(2):556–565
Thomas MM, Cheung SS, Elder GC, Sleiver GC (2006) Voluntary muscle activation is impaired by core temperature rather than local muscle temperature. J Appl Physiol 100(4):1361–1369
Thorlund JB, Michalsik LB, Madsen K, Aagaard P (2008) Acute fatigue-induced changes in muscle mechanical properties and neuromuscular activity in elite handball players following a handball match. Scand J Med Sci Sports 18(4):462–472
Thorlund JB, Aagaard P, Madsen K (2009) Rapid muscle force capacity changes after soccer match play. Int J Sports Med 30(4):273–278
Van Cutsem M, Duchateau J, Hainaut K (1998) Changes in single motor unit behaviour contribute to the increase in contraction speed after dynamic training in humans. J Physiol 513(Pt1):295–305
Wilkinson DM, Carter JM, Richmond VL, Blacker SD, Rayson MP (2008) The effect of cool water ingestion on gastrointestinal pill temperature. Med Sci Sports Exerc 40(3):523–528
Acknowledgments
We thank the volunteers who donated their time and effort to participate in this study and Ivana Matic for her assistance in data collection and analysis. We acknowledge Abdulaziz Mohammed Farooq for valuable assistance with statistical analyses.
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Communicated by Alain Martin.
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Girard, O., Bishop, D.J. & Racinais, S. Hot conditions improve power output during repeated cycling sprints without modifying neuromuscular fatigue characteristics. Eur J Appl Physiol 113, 359–369 (2013). https://doi.org/10.1007/s00421-012-2444-3
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DOI: https://doi.org/10.1007/s00421-012-2444-3