You are here

Home » Content

Metabolic Response to Repetitive Lifting Tasks: Predetermined vs. Self-Selected Pace

Journal Name:

  • International Journal of Science and Engineering Investigations

Publication Year:

  • 2013

Key Words:

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
Understanding the metabolic demands of repetitive lifting tasks with different pacing strategies may help increase productivity and prevent injuries. The purpose of this study was to determine the metabolic response of repetitive lifting tasks performed with different loads and different pacing strategies. Metabolic parameters were recorded as eight male participants (age = 24 ± 6 yr, height = 173 ± 9 cm, weight = 83 ± 23 kg) participated in predetermined pace (PP) and self-selected pace (SP) weight transfer tasks. The tasks required participants to transfer two 11.4, 15.9, and 20.5 kg weight plates individually back and forth a distance of 195.6 cm horizontally and 115.6 cm vertically (lift from 40.6 cm to 156.2 cm high). Task PP required participants to transfer the 6 weight plates each minute for 10 min (i.e., 60 total transfers); task SP required participants to make the 60 transfers in 10 min or less at a self-selected pace. Statistical analyses were made using both steady state and complete task metabolic data. Results were as follows: significant (p = 0.000) differences were observed in VO2 based on pacing strategy (PP or SP) during the transfer of 11.4 kg (PP = 13.0 ± 2.3 vs. SP = 17.8 ± 3.7 ml.kg-1.min-1), 15.9 kg (PP = 14.5 ± 2.9 vs. SP = 19.3 ± 4.9 ml.kg-1.min-1), and 20.5 kg weights (PP = 17.5 ± 4.2 vs. SP = 21.7 ± 5.3 ml.kg-1.min-1); mean VO2 and HR were significantly (p = 0.000) higher during SP (19.6 ± 4.9 ml.kg-1.min-1, 123 ± 13 bpm) than during PP (15.0 ± 3.7 ml.kg-1.min-1, 109 ± 12 bpm); mean time (min) to completion was significantly faster during SP: 11.4 kg (6.5 ± 1.0), 15.9 kg (6.9 ± 1.0), and 20.5 kg (7.6 ± 1.0); regardless of pacing strategy, oxygen cost (VO2) was significantly higher (p < 0.05) as weight transferred increased; and time to complete the SP transfer task increased as weight increased; also, there was no significant difference (p < 0.05) in total (i.e., sum of the three work bouts) energy expenditure between SP (169.0 ± 20.0 kcal) and PP (173.0 ± 17.7 kcal). In conclusion: 1) when self-selecting pace, mean VO2 and HR were significantly higher than during predetermined pace at all workloads; 2) metabolic costs increased with increasing workload; 3) task completion was always quicker when pace was self-selected, but total energy expenditure was similar.
Bookmark/Search this post with
FULL TEXT (PDF): 
PDF icon ijsei-21613-13.pdf
  • 17
68-71
  • English

REFERENCES

References: 

[1] Sevene, T.G., DeBeliso, M., Berning, J.M., Harris, C., Adams, K.J. (2012). Physiological and psychophysical comparison between a one and two-handed identical lifting task. Int J Sci Eng Investig, 1, 86-89.
[2] Kingma, I., & van Dieen, J.H. (2004). Lifting over an obstacle: effects of one-handed lifting and hand support on trunk kinematics and low back loading. Journal of Biomechanics, 27, 249-255.
[3] Waters, T.R. (2004). National efforts to identify research issues related to prevention of work-related musculoskeletal disorders. J Electromyography and Kinesiology, 14, 7-12.
[4] Waters, T.R., Baron, S.L., Piacitelli, L.A., Anderson, V.P., Skov, T., Haring-Sweeney, M., Wall, D.K., Fine, L.J. (1999). Evaluation of the revised NIOSH lifting equation: a cross-sectional epidemiologic study. Spine 24, 386-394.
[5] Adams, K.J., DeBeliso, M., Sevene-Adams, P.G., Berning, J.M., Miller, T., & Tollerud, D.J. (2010). Physiological and psycophysical comparison between a lifting task with identical weight but different coupling factors. Journal of Strength and Conditioning Research, 24, 307-312.
[6] DeBeliso, M., O’Shea, J.P., Harris, C., Adams, K.J., Climstein, M. (2004). The relation between trunk strength measures and lumbar disc deformation during stoop type lifting. JEPonline 7, 16-26.
[7] Chung, H., Wang, M.J. (2001). The effects of container design and stair climbing on maximal acceptable lift weight, wrist posture, psychophysical, and physiological responses in wafer-handling tasks. Applied Ergonomics 32, 593-598.
[8] Dempsey, P.G., Mathiassen, S.E. (2006). On the evolution of task-based analysis of manual materials handling, and its applicability in contemporary ergonomics. Applied Ergonomics 37, 33-43.
[9] Abbiss, C.R., Laursen, P.B. (2008). Describing and understanding pacing strategies during athletic competiton. Sports Med 38, 239-252.
[10] Baron, B., Moullan, F., Deruelle, F., Noakes, T.D. (2011). The role of emotions on pacing strategies and performance in middle and long duration sport events. Br J Sports Med 45, 511-517.
[11] Billaut, F., Bishop, D.J., Schaerz, S., Noakes, T.D. (2011). Influence of knowledge of sprint number on pacing during repeated-sprint exercise. Med Sci Sports Exerc 43, 665-672.
[12] de Koning, J.J., Foster, C., Bakkum, A., Kloppenburg, S., Thiel, C., Joseph, T., Cohen, J., Porcari, J.P. (2011). Regulation of pacing strategy during athletic competition. PLoS ONE 6 (1), e15863.
[13] Esteve-Lanao, J., Lucia, A., de Koning, J.J., Foster, C. (2008). How do humans control physiological strain during strenuous endurance exercise? PLoS ONE 3 (8), e2943.
[14] St Clair Gibson, A., Lambert, E.V., Rauch, L.H., Tucker, R., Baden, D.A., Foster, C., Noakes, T.D. (2006). The role of information processing between the brain and peripheral physiological systems in pacing and perception of effort. Sports Med 36, 705-722.
[15] Tucker, R., Noakes, T.D. (2009). The physiological regulation of pacing strategy during exercise: a critical review. (2009). Br J Sports Med 43(6), e1, Epub, Feb. 17.
[16] American College of Sports Medicine (2014). ACSM’s Guidelines for Exercise Testing and Prescription, 9th Ed. Lippincott Williams & Wilkins, Maryland, USA.
[17] Kraemer, W.J., Mazzetti, S.A., Nindl, B.C., Gotshalk, L.A., Volek, J.S., Bush, J.A., Mars, J.O., Dohi, K., Gomez, A.L., Miles, M., Fleck, S.J., Newton, R.U., & Hakkinen, K. (2001). Effect of resistance training on women’s strength/power and occupational performances. Medicine and Science in Sports and Exercise, 33, 1011-1025.
[18] Nindl, B.C., Sharp, M.A., Mello, R.P., Rice, V.J., Murphy, N.M., & Patton, J.F. (1998). Gender comparison of peak oxygen uptake: repetitive box lifting versus treadmill running. European Journal of Applied Physiology, 77, 112-117.
[19] Sharp, M.A., Harman, E., Vogel, J.A., Knapik, J.J., & Legg, S.J. (1988). Maximal aerobic capacity for repetitive lifting: comparison with three standard exercise testing modes. European Journal of Applied Physiology, 57, 753-760.
[20] Bassett, D.R., Howley, E.T., Thompson, D.L., King, G.A., Strath, S.J., McLaughlin, J.E., and Parr, B.B. (2001). Validation of a computerized metabolic measurement system. Journal of Applied Physiology, 91, 218-224.
[21] Fry, A.C. (2004). The role of resistance exercise intensity on muscle fibre adaptations. Sports Med 34, 663-679.
[22] Borg, G.A.V. (1982). Psychophysical basis of perceived exertion. Medicine and Science in Sports and Exercise, 14, 377-387.

Thank you for copying data from http://www.arastirmax.com