Metabolic profile of a crossfit training bout

Kurt Anthony Escobar, Jacobo Morales, Trisha Ann VanDusseldorp

Abstract

CrossFit is a physically and metabolically-demanding training mode increasing in popularity among recreational athletes. Presently, however, scarce evidence is available documenting its energetic profile. This study investigated the metabolic characteristics of a CrossFit training bout as measured by expired gases and blood lactate. Eleven females and 7 males completed a 12-minute CrossFit bout on two occasions separated by three days. During both experimental sessions (Pt1, Pt2), subjects performed as many rounds as possible (AMRAP) within the timed workout which consisted of consisted of 12 box jumps (30” for males, 20” for females), 6 thrusters (24 kg for males, 16 kg for females), and 6 bar-facing burpees in sequence. Oxygen consumption (VO2), respiratory exchange ratio (RER), blood lactate (BL), and repetitions completed were measured during both experimental sessions. The average VO2 and RER of both bouts (Pt1 and Pt2) was 37.0 ± 4.8 ml/kg/min and 1.04 ± 0.1, respectively. Average BL significantly increased above pre-exercise concentrations (3.0 ± 1.3 mmol/L) at 4 min (10.1 ± 3.2 mmol/L; p < 0.01), 8 min (12.3 ± 3.5 mmol/L; p < 0.01), and immediately post at 12 min (12.6 ± 3.9 mmol/L; p < 0.01). Repetitions completed in Pt2 (140.2 ± 25.9) were significantly different to repetitions completed in Pt1 (131.2 ± 27.2) (p = 0.023). Average repetitions completed in Pt1 and Pt 2 was 135.7 ± 26.6. These data suggest that CrossFit is a metabolically-demanding conditioning method that relies heavily on both aerobic and anaerobic energy production and may represent an alternative to traditional methods of exercise to improve fitness and longevity.


Keywords

Anaerobic exercise; High-Intensity; Lactate; Metabolism

References

Babiash, P., Porcari, J. P., Steffen, J., Doberstein, S., & Foster, C. (2013). CrossFit: New research puts popular workout to the test. Ace ProSource(November), 4.

Fortner, H. A., Salgado, J. M., Holmstrup, A. M., & Holmstrup, M. E. (2014). Cardiovascular and Metabolic Demands of the Kettlebell Swing using Tabata Interval versus a Traditional Resistance Protocol. International Journal of Exercise Science, 7(3), 7.

Franch, J., Madsen, K., Djurhuus, M. S., & Pedersen, P. K. (1998). Improved running economy following intensified training correlates with reduced ventilatory demands. [Clinical Trial Research Support, Non-U.S. Gov't]. Med Sci Sports Exerc, 30(8), 1250-1256. https://doi.org/10.1097/00005768-199808000-00011

Gibala, M. J., Little, J. P., Macdonald, M. J., & Hawley, J. A. (2012). Physiological adaptations to low-volume, high-intensity interval training in health and disease. [Research Support, Non-U.S. Gov't Review]. J Physiol, 590(Pt 5), 1077-1084. https://doi.org/10.1113/jphysiol.2011.224725

Goedecke, J. H., St Clair Gibson, A., Grobler, L., Collins, M., Noakes, T. D., & Lambert, E. V. (2000). Determinants of the variability in respiratory exchange ratio at rest and during exercise in trained athletes. [Comparative Study Research Support, Non-U.S. Gov't]. Am J Physiol Endocrinol Metab, 279(6), E1325-1334.

Greenhaff, P. L., Nevill, M. E., Soderlund, K., Bodin, K., Boobis, L. H., Williams, C., & Hultman, E. (1994). The Metabolic Responses of Human Type-I and Type-Ii Muscle-Fibers during Maximal Treadmill Sprinting. Journal of Physiology-London, 478(1), 149-155. https://doi.org/10.1113/jphysiol.1994.sp020238

Hood, M. S., Little, J. P., Tarnopolsky, M. A., Myslik, F., & Gibala, M. J. (2011). Low-volume interval training improves muscle oxidative capacity in sedentary adults. [Research Support, Non-U.S. Gov't]. Med Sci Sports Exerc, 43(10), 1849-1856. https://doi.org/10.1249/MSS.0b013e3182199834

Lambert, C. P., & Flynn, M. G. (2002). Fatigue during high-intensity intermittent exercise: application to bodybuilding. [Research Support, U.S. Gov't, P.H.S. Review]. Sports Med, 32(8), 511-522. https://doi.org/10.2165/00007256-200232080-00003

Laursen, P. B., & Jenkins, D. G. (2002). The scientific basis for high-intensity interval training: optimising training programmes and maximising performance in highly trained endurance athletes. [Review]. Sports Med, 32(1), 53-73. https://doi.org/10.2165/00007256-200232010-00003

Little, J. P., Gillen, J. B., Percival, M. E., Safdar, A., Tarnopolsky, M. A., Punthakee, Z., . . . Gibala, M. J. (2011). Low-volume high-intensity interval training reduces hyperglycemia and increases muscle mitochondrial capacity in patients with type 2 diabetes. [Research Support, Non-U.S. Gov't]. J Appl Physiol (1985), 111(6), 1554-1560. https://doi.org/10.1152/japplphysiol.00921.2011

Marx, J. O., Ratamess, N. A., Nindl, B. C., Gotshalk, L. A., Volek, J. S., Dohi, K., . . . Kraemer, W. J. (2001). Low-volume circuit versus high-volume periodized resistance training in women. [Clinical Trial Randomized Controlled Trial]. Med Sci Sports Exerc, 33(4), 635-643. https://doi.org/10.1097/00005768-200104000-00019

Maughan, R. J., Greenhaff, P. L., Leiper, J. B., Ball, D., Lambert, C. P., & Gleeson, M. (1997). Diet composition and the performance of high-intensity exercise. [Review]. J Sports Sci, 15(3), 265-275. https://doi.org/10.1080/026404197367272

Ogita, F., Hara, M., & Tabata, I. (1996). Anaerobic capacity and maximal oxygen uptake during arm stroke, leg kicking and whole body swimming. Acta Physiol Scand, 157(4), 435-441. https://doi.org/10.1046/j.1365-201X.1996.490237000.x

Shaw, B. S., Dullabh, M., Forbes, G., Brandkamp, J. L., & Shaw, I. (2015). Analysis of physiological determinants during a single bout of Crossfit. International Journal of Performance Analysis in Sport, 15(3), 809-815. https://doi.org/10.1080/24748668.2015.11868832

Smith, M. M., Sommer, A. J., Starkoff, B. E., & Devor, S. T. (2013). Crossfit-based high-intensity power training improves maximal aerobic fitness and body composition. J Strength Cond Res, 27(11), 3159-3172. https://doi.org/10.1519/JSC.0b013e318289e59f

Tabata, I., Nishimura, K., Kouzaki, M., Hirai, Y., Ogita, F., Miyachi, M., & Yamamoto, K. (1996). Effects of moderate-intensity endurance and high-intensity intermittent training on anaerobic capacity and VO2max. Med Sci Sports Exerc, 28(10), 1327-1330. https://doi.org/10.1097/00005768-199610000-00018

Wahl, P., Mathes, S., Kohler, K., Achtzehn, S., Bloch, W., & Mester, J. (2013). Effects of active vs. passive recovery during Wingate-based training on the acute hormonal, metabolic and psychological response. [Comparative Study Research Support, Non-U.S. Gov't]. Growth Horm IGF Res, 23(6), 201-208. https://doi.org/10.1016/j.ghir.2013.07.004

Warburton, D. E., McKenzie, D. C., Haykowsky, M. J., Taylor, A., Shoemaker, P., Ignaszewski, A. P., & Chan, S. Y. (2005). Effectiveness of high-intensity interval training for the rehabilitation of patients with coronary artery disease. [Clinical Trial Randomized Controlled Trial Research Support, Non-U.S. Gov't]. Am J Cardiol, 95(9), 1080-1084. https://doi.org/10.1016/j.amjcard.2004.12.063

Whyte, L. J., Gill, J. M., & Cathcart, A. J. (2010). Effect of 2 weeks of sprint interval training on health-related outcomes in sedentary overweight/obese men. [Controlled Clinical Trial Research Support, Non-U.S. Gov't]. Metabolism, 59(10), 1421-1428. https://doi.org/10.1016/j.metabol.2010.01.002




DOI: https://doi.org/10.14198/jhse.2017.124.11





License URL: http://creativecommons.org/licenses/by-nc-nd/3.0/