Research Article of Internal Journal of Sports Medicine and Rehabilitation
Lower Limb Muscle Activity Adjustment and Lactate Variation in Response to Increased Speed with Proportional Resistance in Young Adults
Martín G. Rosario* PT, PhD, CSFI, ATRIC, Daniel Heistand, SPT, Catie Lewis, SPT, Natalie Valdez, SPT, Matthew Nevarez, SPT, Mark Weber PT, PhD, ATC
Texas Woman’s University, Physical Therapy Program, Dallas Campus; Texas.
Background: Various pathologies require physiotherapists to adjust therapy interventions, some of which are to reducing joint loads while strengthening the lower extremity musculature. Tools such as a sled can be used to accomplish a small load with high-repetition-resistance exercises.
Purpose: This study examined the impact of pushing a sled with regulated resistance on lower limb muscle activation and fatigue while walking and running.
Methods: The neuromuscular activity of the tibialis anterior (TA) and gastrocnemius (GA) muscles of thirty-six young adults were recorded using surface electromyography (EMG) and lactate data from a Nova Biomedical Lactate Plus meter. The sled used was the XPO Trainer, which maintains a steady resistance proportional to the user regardless of the forces applied to accelerate the sled. Baseline lactate was collected and followed by one of three protocols: run, run-push (RP), or walk-push (WP). Each included three trials over a 40 ft distance, during which EMG data were collected per trial, whereas lactate was collected following the completion of the appointed task.
Results: Repeated measures ANOVAs were performed, showing a considerable increase (P<0.05) in lactate levels between the WP and RP groups. Pushing the sled at both WP and RP speeds demonstrated substantial (P<0.05) neuromuscular modifications, primarily in the TA, followed by the GA, in comparison to running.
Conclusion: Pushing a constant resistance sled provoked distinct modifications in the lower limb musculature associated with speed. Running while pushing the sled elicits a higher blood lactate response associated with a longer maximal amplitude and a shorter time for muscle recruitment in the GA and TA muscles, all indicative of endurance-oriented exercise.
Keywords: XPO Trainer, Lactate Levels, Fatigue, Low extremity musculature, Resistance Training, Sled Training. Constant Resistance
How to cite this article:
Martín G. Rosario, Daniel Heistand, Catie Lewis, Natalie Valdez, Matthew Nevarez, Mark Weber. Lower Limb Muscle Activity Adjustment and Lactate Variation in Response to Increased Speed with Proportional Resistance in Young Adults. Internal Journal of Sports Medicine and Rehabilitation, 2021; 4:18. DOI: 10.28933/ijsmr-201-02-1005
1. Aduen, J., Bernstein, W. K., Khastgir, T., Miller, J., Kerzner, R., Bhatiani, A., Lustgarten, J., Bassin, A. S., Davidson, L., & Chernow, B. (1994). The use and clinical importance of a substrate-specific electrode for rapid determination of blood lactate concentrations. Jama, 272(21), 1678-1685. DOI: 10.1001/jama.1994.03520210062033
2. Borotikar, B. S., & Sheehan, F. T. (2013). In vivo patellofemoral contact mechanics during active extension using a novel dynamic MRI-based methodology. Osteoarthritis and cartilage, 21(12), 1886-1894. DOI: 10.1016/j.joca.2013.08.023
3. Cohen, Z. A., Roglic, H., Grelsamer, R. P., Henry, J. H., Levine, W. N., Van Mow, C., & Ateshian, G. A. (2001). Patellofemoral stresses during open and closed kinetic chain exercises: an analysis using computer simulation. The American journal of sports medicine, 29(4), 480-487. DOI: 10.1177/03635465010290041701
4. DeMers, M. S., Pal, S., & Delp, S. L. (2014). Changes in tibiofemoral forces due to variations in muscle activity during walking. Journal of or-thopaedic research: official publication of the Or-thopaedic Research Society, 32(6), 769–776. DOI: 10.1002/jor.22601
5. Guadagnin, E.C., Barbieri, F.A., Simieli, L., & Carpes, F.P. (2019). Is muscular and functional performance related to gait symmetry in older adults? A systematic review. Archives of Geron-tology and Geriatrics, 84, 1-6. doi: 10.1016/j.archger.2019.103899.
6. Folland, J. P., Irish, C. S., Robert, J. C., Tarr, J. E., & Jones, D. A. (2002). Fatigue is not a nec-essary stimulus for strength gains during re-sistance training. British Journal of Sports Medi-cine, 36(5), 370–373. DOI: 10.1136/bjsm.36.5.370
7. Hamlyn N, Behm DG, Young WB. Trunk muscle activation during dynamic weight-training exer-cises and isometric instability activities. J Strength Cond Res. 2007 Nov;21(4):1108-12. doi: 10.1519/R-20366.1. PMID: 18076231.Kawamori, Naoki & Newton, Robert & Nosaka, Ken. (2014). Effects of weighted sled towing on ground reac-tion force during the acceleration phase of sprint running. Journal of sports sciences, 32(12) DOI: 10.1080/02640414.2014.886129
8. Lopez, P., Pinto, R. S., Radaelli, R., Rech, A., Grazioli, R., Izquierdo, M., & Cadore, E. L. (2018). Benefits of resistance training in physically frail elderly: a systematic review. Aging clinical and experimental research, 30(8), 889-899. DOI: 10.1007/s40520-017-0863-z
9. Nicholson, V. P., McKean, M. R., & Burkett, B. J. (2015). Low-load high-repetition resistance train-ing improves strength and gait speed in mid-dle-aged and older adults. Journal of science and medicine in sport, 18(5), 596-600. DOI: 10.1016/j.jsams.2014.07.018
10. Rosario, M. G. (2020). Neuromuscular timing modification in responses to increased speed and proportional resistance while pushing a sled in young adults. European Journal of Human Movement, 44, 50-66. DOI: 10.21134/eurjhm.2020.44.544.
11. Rosario, M.G., & Mathis, M. (2020). Lower limb muscle activation and kinematics modifications of young healthy adults while pushing a variable resistance sled. Journal of Human Sport and Ex-ercise. DOI: 10.14198/jhse.2021.164.06
12. Roos, P. E., Barton, N., & van Deursen, R. W. (2012). Patellofemoral joint compression forces in backward and forward running. Journal of bio-mechanics, 45(9), 1656-1660. DOI: 10.1016/j.jbiomech.2012.03.020
13. Rossom, S., Smith, C., Thelen, D., Vanwanseele, B., Assche, D., & Jonkers, I. (2018). Knee Joint Loading in Healthy Adults During Functional Ex-ercises: Implications for Rehabilitation Guidelines. Journal of Orthopaedic And Sports Physical Therapy, 48(3), 162–173.DOI: 10.2519/jospt.2018.7459
14. Saxby, D. J., Modenese, L., Bryant, A. L., Gerus, P., Killen, B., Fortin, K., Wrigley, T. V., Bennell, K. L., Cicuttini, F. M., & Lloyd, D. G. (2016). Tibio-femoral contact forces during walking, running and sidestepping. Gait & posture, 49, 78-85. DOI: 10.1016/j.jbiomech.2012.03.020
15. Tenan, M. S., McMurray, R. G., Blackburn, B. T., McGrath, M., & Leppert, K. (2011). The relation-ship between blood potassium, blood lactate, and electromyography signals related to fatigue in a progressive cycling exercise test. Journal of Electromyography and Kinesiology, 21(1), 25-32. DOI: 10.1016/j.jelekin.2010.09.002