Dissociated time course of recovery between strength and power after isoinertial resistance loading in rugby union players.

Rodney Kennedy, David Drake

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

There is a substantial amount of research on the responses to isometric and eccentric loading. However, only a paucity of literature exists on the responses to isoinertial loading, especially in trained athletic populations using realistic loading protocols. The purpose of this study was to examine the acute neuromuscular response to a bout of isoinertial resistance loading in elite rugby players. Seventeen male (age: 19.5 ± 2.3 years) rugby union players performed a conventional maximal isoinertial resistance loading protocol. Countermovement jump (CMJ) and maximal voluntary isometric contraction (MVC) performance was measured on three occasions: at baseline, immediately post and 48h post. The results indicated that the decrease in MVC (9.7%) is greater than or comparable with the CMJ output variables (4.2-10.3%), immediately post exercise. Whilst isometric strength had demonstrated a full recovery at 48h post, many of the key CMJ output variables were still impaired (P <0.05). Similar findings were observed in the normalised CMJ curves. Complete recovery of the ability to rapidly produced force may require more than 48h in many athletes. Individual responses should therefore be monitored to help plan acute and chronic training loads. It is recommended that future fatigue studies should incorporate temporal phase analyses to consider the power-, force-, velocity-, and displacement-time curves.
LanguageEnglish
Pages748-755
JournalJournal of Strength and Conditioning Research
Volume32
Issue number3
Early online date1 Mar 2017
DOIs
Publication statusPublished - Mar 2018

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Isometric Contraction
Football
Athletes
Sports
Fatigue
Exercise
Research
Population

Keywords

  • athletes
  • resistance training
  • rest
  • sports

Cite this

@article{5c9e5e1ec7994a4ea1ae367b9eb4fc7f,
title = "Dissociated time course of recovery between strength and power after isoinertial resistance loading in rugby union players.",
abstract = "There is a substantial amount of research on the responses to isometric and eccentric loading. However, only a paucity of literature exists on the responses to isoinertial loading, especially in trained athletic populations using realistic loading protocols. The purpose of this study was to examine the acute neuromuscular response to a bout of isoinertial resistance loading in elite rugby players. Seventeen male (age: 19.5 ± 2.3 years) rugby union players performed a conventional maximal isoinertial resistance loading protocol. Countermovement jump (CMJ) and maximal voluntary isometric contraction (MVC) performance was measured on three occasions: at baseline, immediately post and 48h post. The results indicated that the decrease in MVC (9.7{\%}) is greater than or comparable with the CMJ output variables (4.2-10.3{\%}), immediately post exercise. Whilst isometric strength had demonstrated a full recovery at 48h post, many of the key CMJ output variables were still impaired (P <0.05). Similar findings were observed in the normalised CMJ curves. Complete recovery of the ability to rapidly produced force may require more than 48h in many athletes. Individual responses should therefore be monitored to help plan acute and chronic training loads. It is recommended that future fatigue studies should incorporate temporal phase analyses to consider the power-, force-, velocity-, and displacement-time curves.",
keywords = "athletes, resistance training, rest, sports",
author = "Rodney Kennedy and David Drake",
note = "Reference text: 1. Aagaard P. Training-induced changes in neural function. Exerc Sport Sci Rev 31: 61-67, 2003. 2. Aagaard P, Simonsen EB, Andersen JL, Magnusson P, and Dyhre-Poulsen P. Increased rate of force development and neural drive of human skeletal muscle following resistance training. J Appl Physiol 93: 1318-1326, 2002. 3. Ahtiainen JP and Hakkinen K. Strength athletes are capable to produce greater muscle activiation and neural fatigue during high-intensity resistance exercise than nonathletes. J Strength Cond Res 23: 1129-1134, 2009. 4. Ahtiainen JP, Pakarinen A, Kraemer WJ, and Hakkinen K. Acute hormonal and neuromuscular responses and recovery to forced vs. maximum repetitions multiple resistance exercises. Int J Sports Med 24: 410-418, 2003. 5. Ahtiainen JP, Pakarinen A, Kraemer WJ, and Hakkinen K. Acute hormonal responses to heavy resistance exercise in strength athletes versus nonathletes. Can J Appl Physiol 29: 527-543, 2004. 6. Andersen LL and Aagaard P. Influence of maximal muscle strength and intrinsic muscle contractile properties on contractile rate of force development. Eur J Appl Physiol 96: 46-52, 2006. 7. Bigland-Ritchie B, Furbush F, and Woods JJ. Fatigue of intermittent submaximal voluntary contractions - central and peripheral factors. J Appl Physiol 61: 421-429, 1986. 8. Bigland-Ritchie B and Woods JJ. Changes in muscle contraction properties and neural control during human muscular fatigue. Muscle & Nerve 7: 691-699, 1984. 9. Byrne C and Eston R. The effect of exercise-induced muscle damage on isometric and dynamic knee extensor strength and vertical jump performance. J Sports Sci 20: 417-425, 2002. 10. Cairns SP, Knicker AJ, Thompson MW, and Sjogaard G. Evaluation of models used to study neuromuscular fatigue. Exerc Sport Sci Rev 33: 9-16, 2005. 11. Chen TC, Lin KY, Chen HL, Lin MJ, and Nosaka K. Comparison in eccentric exercise-induced muscle damage among four limb muscles. Eur J Appl Physiol 111: 211-223, 2011. 12. Cohen J. Statisitical Power Analysis for the Behavioural Sciences Hillsdale, NJ: Lawrence Erlbaum, 1988. 13. Cormie P, McBride JM, and McCaulley GO. Power-time, force-time, and velocity-time curve analysis during the jump squat: Impact of load. J Appl Biomech 24: 112-120, 2008. 14. Cormie P, McBride JM, and McCaulley GO. Power-time, force-time, and velocity-time curve analysis of the countermovement jump: impact of training. J Strength Cond Res 23: 177-186, 2009. 15. Cormie P, McGuigan MR, and Newton RU. Adaptations in athletic performance after ballistic power versus strength training. Med Sci Sports Exerc 42: 1582-1598, 2010. 16. Cormie P, McGuigan MR, and Newton RU. Influence of strength on magnitude and mechanisms of adaptation to power training. Med Sci Sports Exerc 42: 1566-1581, 2010. 17. Cormie P, McGuigan MR, and Newton RU. Developing maximal neuromuscular power part 2: training considerations for improving maximal power production. Sports Med 41: 125-146, 2011. 18. Damas F, Nosaka K, Libardi CA, Chen TC, and Ugrinowitsch C. Susceptibility to exercise-induced muscle damage: a cluster analysis with a large sample. Int J Sports Med 37: 633-640, 2016. 19. Dousset E, Avela J, Ishikawa M, Kallio J, Kuitunen S, Kyrolainen H, Linnamo V, and Komi PV. Bimodal recovery pattern in human skeletal muscle induced by exhaustive stretch-shortening cycle exercise. Med Sci Sports Exerc 39: 453-460, 2007. 20. Farup J, Rahbek SK, Bjerre J, de Paoli F, and Vissing K. Associated decrements in rate of force development and neural drive after maximal eccentric exercise. Scand J Med Sci Sports 26: 498-506, 2016. 21. Foster C. Monitoring training in athletes with reference to overtraining syndrome. Med Sci Sports Exerc 30: 1164-1168, 1998. 22. Gandevia SC, Enoka RM, McComas AJ, Stuart DG, and Thomas CK, eds. Fatigue: Neural and Muscular Mechanisms. New York: Plenum Press, 1996. 23. Gathercole R, Sporer B, Stellingwerff T, and Sleivert G. Alternative countermovement jump analysis to quantify acute neuromuscular fatigue. Int J Sports Physiol Perform 10: 84-92, 2015. 24. Haff GG, Carlock JM, Hartman MJ, Kilgore JL, Kawamori N, Jackson JR, Morris RT, Sands WA, and Stone MH. Force-time curve characteristics of dynamic and isometric muscle actions of elite women olympic weightlifters. J Strength Cond Res 19: 741-748, 2005. 25. Hopkins WG, Marshall SW, Batterham AM, and Hanin J. Progressive statistics for studies in sports medicine and exercise science. Med Sci Sports Exerc 41: 3-12, 2009. 26. Howatson G, Brandon R, and Hunter AM. The response to and recovery from maximum-strength and -power training in elite track and field athletes. Int J Sports Physiol Perform 11: 356-362, 2016. 27. Hubal MJ, Rubinstein SR, and Clarkson PM. Mechanisms of variability in strength loss after muscle-lengthening actions. Med Sci Sports Exerc 39: 461-468, 2007. 28. Jones EJ, Bishop PA, Richardson MT, and Smith JF. Stability of a practical measure of recovery from resistance training. J Strength Cond Res 20: 756-759, 2006. 29. Lauersen JB, Bertelsen DM, and Andersen LB. The effectiveness of exercise interventions to prevent sports injuries: a systematic review and meta-analysis of randomised controlled trials. Br J Sports Med 48, 2014. 30. Linnamo V, Hakkinen K, and Komi PV. Neuromuscular fatigue and recovery in maximal compared to explosive strength loading. Eur J Appl Physiol Occup Physiol 77: 176-181, 1998. 31. MacIntyre DL, Reid WD, Lyster DM, Szasz IJ, and McKenzie DC. Presence of WBC, decreased strength, and delayed soreness in muscle after eccentric exercise. J Appl Physiol 80: 1006-1013, 1996. 32. McCaulley GO, McBride JM, Cormie P, Hudson MB, Nuzzo JL, Quindry JC, and Triplett NT. Acute hormonal and neuromuscular responses to hypertrophy, strength and power type resistance exercise. Eur J Appl Physiol 105: 695-704, 2009. 33. McGuigan MR and Foster C. A new approach to monitoring resistance training. Strength Cond J 26: 42-47, 2004. 34. McLellan CP, Lovell DI, and Gass GC. The role of rate of force development on vertical jump performance. J Strength Cond Res 25: 379-385, 2011. 35. Molina R and Denadai BS. Dissociated time course recovery between rate of force development and peak torque after eccentric exercise. Clin Physiol Funct Imaging 32: 179-184, 2012. 36. Murphy AJ, Wilson GJ, Pryor JF, and Newton RU. Isometric assessment of muscular function: the effect of joint angle. J Appl Biomech 11: 205-215, 1995. 37. Nicol C, Avela J, and Komi PV. The stretch-shortening cycle: A model to study naturally occurring neuromuscular fatigue. Sports Med 36: 977-999, 2006. 38. Nosaka K and Clarkson PM. Muscle damage following repeated bouts of high force eccentric exercise Med Sci Sports Exerc 27: 1263-1269, 1995. 39. Nuzzo JL, McBride JM, Cormie P, and McCaulley GO. Relationship between countermovement jump performance and multijoint isometric and dynamic tests of strength J Strength Cond Res 22: 699-707, 2008. 40. Paulsen G, Mikkelsen UR, Raastad T, and Peake JM. Leucocytes, cytokines and satellite cells: what role do they play in muscle damage and regeneration following eccentric exercise? Exerc Immunol Rev 18: 42-97, 2012. 41. Penailillo L, Blazevich A, Numazawa H, and Nosaka K. Rate of force development as a measure of muscle damage. Scand J Med Sci Sports 25: 417-427, 2015. 42. Raastad T and Hallen J. Recovery of skeletal muscle contractility after high- and moderate-intensity strength exercise. Eur J Appl Physiol 82: 206-214, 2000. 43. Radaelli R, Bottaro M, Wilhelm EN, Wagner DR, and Pinto RS. Time course of strength and echo intensity recovery after resistance training exercise in women. J Strength Cond Res 26: 2577-2584, 2012. 44. Raeder C, Wiewelhove T, Westphal-Martinez MP, Fernandez-Fernandez J, de Paula Simola RA, Kellmann M, Meyer T, Pfeiffer M, and Ferrauti A. Neuromuscular fatigue and physiological responses after five dynamic squat exercise protocols. J Strength Cond Res 30: 953-965, 2016. 45. Stone MH, Sands WA, Carlock J, Callan S, Dickie D, Daigle K, Cotton J, Smith SL, and Hartman M. The importance of isometric maximum strength and peak rate-of-force development in sprint cycling. J Strength Cond Res 18: 878-884, 2004. 46. Street G, McMillan S, Board W, Rasmussen M, and Heneghan JM. Sources of error in determining countermovement jump height with the impulse method. J Appl Biomech 17: 43-54, 2001. 47. Suchomel TJ, Nimphius S, and Stone MH. The importance of muscular strength in athletic populations. Sports Med 46:1419-1449, 2016. 48. Thomas JR and Nelson JK. Research Methods in Physical Activity. Champaign, IL: Human Kinetics 2001. 49. Walker S, Davis L, Avela J, and Hakkinen K. Neuromuscular fatigue during dynamic maximal strength and hypertrophic resistance loadings. J Electromyogr Kinesiol 22: 356-362, 2012. 50. Wardle H and Wislon G. Practical strength programming training tips for athletes: what works. Strength and Conditioning Coach 4: 3-5, 1996. 51. Zebis MK, Andersen LL, Ellingsgaard H, and Aagaard P. Rapid hamstring/quadricep force capacity in male vs. female elite soccer players. J Strength Cond Res 25: 1989-1993, 2011.",
year = "2018",
month = "3",
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language = "English",
volume = "32",
pages = "748--755",
journal = "Journal of Strength and Conditioning Research",
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}

TY - JOUR

T1 - Dissociated time course of recovery between strength and power after isoinertial resistance loading in rugby union players.

AU - Kennedy, Rodney

AU - Drake, David

N1 - Reference text: 1. Aagaard P. Training-induced changes in neural function. Exerc Sport Sci Rev 31: 61-67, 2003. 2. Aagaard P, Simonsen EB, Andersen JL, Magnusson P, and Dyhre-Poulsen P. Increased rate of force development and neural drive of human skeletal muscle following resistance training. J Appl Physiol 93: 1318-1326, 2002. 3. Ahtiainen JP and Hakkinen K. Strength athletes are capable to produce greater muscle activiation and neural fatigue during high-intensity resistance exercise than nonathletes. J Strength Cond Res 23: 1129-1134, 2009. 4. Ahtiainen JP, Pakarinen A, Kraemer WJ, and Hakkinen K. Acute hormonal and neuromuscular responses and recovery to forced vs. maximum repetitions multiple resistance exercises. Int J Sports Med 24: 410-418, 2003. 5. Ahtiainen JP, Pakarinen A, Kraemer WJ, and Hakkinen K. Acute hormonal responses to heavy resistance exercise in strength athletes versus nonathletes. Can J Appl Physiol 29: 527-543, 2004. 6. Andersen LL and Aagaard P. Influence of maximal muscle strength and intrinsic muscle contractile properties on contractile rate of force development. Eur J Appl Physiol 96: 46-52, 2006. 7. Bigland-Ritchie B, Furbush F, and Woods JJ. Fatigue of intermittent submaximal voluntary contractions - central and peripheral factors. J Appl Physiol 61: 421-429, 1986. 8. Bigland-Ritchie B and Woods JJ. Changes in muscle contraction properties and neural control during human muscular fatigue. Muscle & Nerve 7: 691-699, 1984. 9. Byrne C and Eston R. The effect of exercise-induced muscle damage on isometric and dynamic knee extensor strength and vertical jump performance. J Sports Sci 20: 417-425, 2002. 10. Cairns SP, Knicker AJ, Thompson MW, and Sjogaard G. Evaluation of models used to study neuromuscular fatigue. Exerc Sport Sci Rev 33: 9-16, 2005. 11. Chen TC, Lin KY, Chen HL, Lin MJ, and Nosaka K. Comparison in eccentric exercise-induced muscle damage among four limb muscles. Eur J Appl Physiol 111: 211-223, 2011. 12. Cohen J. Statisitical Power Analysis for the Behavioural Sciences Hillsdale, NJ: Lawrence Erlbaum, 1988. 13. Cormie P, McBride JM, and McCaulley GO. Power-time, force-time, and velocity-time curve analysis during the jump squat: Impact of load. J Appl Biomech 24: 112-120, 2008. 14. Cormie P, McBride JM, and McCaulley GO. Power-time, force-time, and velocity-time curve analysis of the countermovement jump: impact of training. J Strength Cond Res 23: 177-186, 2009. 15. Cormie P, McGuigan MR, and Newton RU. Adaptations in athletic performance after ballistic power versus strength training. Med Sci Sports Exerc 42: 1582-1598, 2010. 16. Cormie P, McGuigan MR, and Newton RU. Influence of strength on magnitude and mechanisms of adaptation to power training. Med Sci Sports Exerc 42: 1566-1581, 2010. 17. Cormie P, McGuigan MR, and Newton RU. Developing maximal neuromuscular power part 2: training considerations for improving maximal power production. Sports Med 41: 125-146, 2011. 18. Damas F, Nosaka K, Libardi CA, Chen TC, and Ugrinowitsch C. Susceptibility to exercise-induced muscle damage: a cluster analysis with a large sample. Int J Sports Med 37: 633-640, 2016. 19. Dousset E, Avela J, Ishikawa M, Kallio J, Kuitunen S, Kyrolainen H, Linnamo V, and Komi PV. Bimodal recovery pattern in human skeletal muscle induced by exhaustive stretch-shortening cycle exercise. Med Sci Sports Exerc 39: 453-460, 2007. 20. Farup J, Rahbek SK, Bjerre J, de Paoli F, and Vissing K. Associated decrements in rate of force development and neural drive after maximal eccentric exercise. Scand J Med Sci Sports 26: 498-506, 2016. 21. Foster C. Monitoring training in athletes with reference to overtraining syndrome. Med Sci Sports Exerc 30: 1164-1168, 1998. 22. Gandevia SC, Enoka RM, McComas AJ, Stuart DG, and Thomas CK, eds. Fatigue: Neural and Muscular Mechanisms. New York: Plenum Press, 1996. 23. Gathercole R, Sporer B, Stellingwerff T, and Sleivert G. Alternative countermovement jump analysis to quantify acute neuromuscular fatigue. Int J Sports Physiol Perform 10: 84-92, 2015. 24. Haff GG, Carlock JM, Hartman MJ, Kilgore JL, Kawamori N, Jackson JR, Morris RT, Sands WA, and Stone MH. Force-time curve characteristics of dynamic and isometric muscle actions of elite women olympic weightlifters. J Strength Cond Res 19: 741-748, 2005. 25. Hopkins WG, Marshall SW, Batterham AM, and Hanin J. Progressive statistics for studies in sports medicine and exercise science. Med Sci Sports Exerc 41: 3-12, 2009. 26. Howatson G, Brandon R, and Hunter AM. The response to and recovery from maximum-strength and -power training in elite track and field athletes. Int J Sports Physiol Perform 11: 356-362, 2016. 27. Hubal MJ, Rubinstein SR, and Clarkson PM. Mechanisms of variability in strength loss after muscle-lengthening actions. Med Sci Sports Exerc 39: 461-468, 2007. 28. Jones EJ, Bishop PA, Richardson MT, and Smith JF. Stability of a practical measure of recovery from resistance training. J Strength Cond Res 20: 756-759, 2006. 29. Lauersen JB, Bertelsen DM, and Andersen LB. The effectiveness of exercise interventions to prevent sports injuries: a systematic review and meta-analysis of randomised controlled trials. Br J Sports Med 48, 2014. 30. Linnamo V, Hakkinen K, and Komi PV. Neuromuscular fatigue and recovery in maximal compared to explosive strength loading. Eur J Appl Physiol Occup Physiol 77: 176-181, 1998. 31. MacIntyre DL, Reid WD, Lyster DM, Szasz IJ, and McKenzie DC. Presence of WBC, decreased strength, and delayed soreness in muscle after eccentric exercise. J Appl Physiol 80: 1006-1013, 1996. 32. McCaulley GO, McBride JM, Cormie P, Hudson MB, Nuzzo JL, Quindry JC, and Triplett NT. Acute hormonal and neuromuscular responses to hypertrophy, strength and power type resistance exercise. Eur J Appl Physiol 105: 695-704, 2009. 33. McGuigan MR and Foster C. A new approach to monitoring resistance training. Strength Cond J 26: 42-47, 2004. 34. McLellan CP, Lovell DI, and Gass GC. The role of rate of force development on vertical jump performance. J Strength Cond Res 25: 379-385, 2011. 35. Molina R and Denadai BS. Dissociated time course recovery between rate of force development and peak torque after eccentric exercise. Clin Physiol Funct Imaging 32: 179-184, 2012. 36. Murphy AJ, Wilson GJ, Pryor JF, and Newton RU. Isometric assessment of muscular function: the effect of joint angle. J Appl Biomech 11: 205-215, 1995. 37. Nicol C, Avela J, and Komi PV. The stretch-shortening cycle: A model to study naturally occurring neuromuscular fatigue. Sports Med 36: 977-999, 2006. 38. Nosaka K and Clarkson PM. Muscle damage following repeated bouts of high force eccentric exercise Med Sci Sports Exerc 27: 1263-1269, 1995. 39. Nuzzo JL, McBride JM, Cormie P, and McCaulley GO. Relationship between countermovement jump performance and multijoint isometric and dynamic tests of strength J Strength Cond Res 22: 699-707, 2008. 40. Paulsen G, Mikkelsen UR, Raastad T, and Peake JM. Leucocytes, cytokines and satellite cells: what role do they play in muscle damage and regeneration following eccentric exercise? Exerc Immunol Rev 18: 42-97, 2012. 41. Penailillo L, Blazevich A, Numazawa H, and Nosaka K. Rate of force development as a measure of muscle damage. Scand J Med Sci Sports 25: 417-427, 2015. 42. Raastad T and Hallen J. Recovery of skeletal muscle contractility after high- and moderate-intensity strength exercise. Eur J Appl Physiol 82: 206-214, 2000. 43. Radaelli R, Bottaro M, Wilhelm EN, Wagner DR, and Pinto RS. Time course of strength and echo intensity recovery after resistance training exercise in women. J Strength Cond Res 26: 2577-2584, 2012. 44. Raeder C, Wiewelhove T, Westphal-Martinez MP, Fernandez-Fernandez J, de Paula Simola RA, Kellmann M, Meyer T, Pfeiffer M, and Ferrauti A. Neuromuscular fatigue and physiological responses after five dynamic squat exercise protocols. J Strength Cond Res 30: 953-965, 2016. 45. Stone MH, Sands WA, Carlock J, Callan S, Dickie D, Daigle K, Cotton J, Smith SL, and Hartman M. The importance of isometric maximum strength and peak rate-of-force development in sprint cycling. J Strength Cond Res 18: 878-884, 2004. 46. Street G, McMillan S, Board W, Rasmussen M, and Heneghan JM. Sources of error in determining countermovement jump height with the impulse method. J Appl Biomech 17: 43-54, 2001. 47. Suchomel TJ, Nimphius S, and Stone MH. The importance of muscular strength in athletic populations. Sports Med 46:1419-1449, 2016. 48. Thomas JR and Nelson JK. Research Methods in Physical Activity. Champaign, IL: Human Kinetics 2001. 49. Walker S, Davis L, Avela J, and Hakkinen K. Neuromuscular fatigue during dynamic maximal strength and hypertrophic resistance loadings. J Electromyogr Kinesiol 22: 356-362, 2012. 50. Wardle H and Wislon G. Practical strength programming training tips for athletes: what works. Strength and Conditioning Coach 4: 3-5, 1996. 51. Zebis MK, Andersen LL, Ellingsgaard H, and Aagaard P. Rapid hamstring/quadricep force capacity in male vs. female elite soccer players. J Strength Cond Res 25: 1989-1993, 2011.

PY - 2018/3

Y1 - 2018/3

N2 - There is a substantial amount of research on the responses to isometric and eccentric loading. However, only a paucity of literature exists on the responses to isoinertial loading, especially in trained athletic populations using realistic loading protocols. The purpose of this study was to examine the acute neuromuscular response to a bout of isoinertial resistance loading in elite rugby players. Seventeen male (age: 19.5 ± 2.3 years) rugby union players performed a conventional maximal isoinertial resistance loading protocol. Countermovement jump (CMJ) and maximal voluntary isometric contraction (MVC) performance was measured on three occasions: at baseline, immediately post and 48h post. The results indicated that the decrease in MVC (9.7%) is greater than or comparable with the CMJ output variables (4.2-10.3%), immediately post exercise. Whilst isometric strength had demonstrated a full recovery at 48h post, many of the key CMJ output variables were still impaired (P <0.05). Similar findings were observed in the normalised CMJ curves. Complete recovery of the ability to rapidly produced force may require more than 48h in many athletes. Individual responses should therefore be monitored to help plan acute and chronic training loads. It is recommended that future fatigue studies should incorporate temporal phase analyses to consider the power-, force-, velocity-, and displacement-time curves.

AB - There is a substantial amount of research on the responses to isometric and eccentric loading. However, only a paucity of literature exists on the responses to isoinertial loading, especially in trained athletic populations using realistic loading protocols. The purpose of this study was to examine the acute neuromuscular response to a bout of isoinertial resistance loading in elite rugby players. Seventeen male (age: 19.5 ± 2.3 years) rugby union players performed a conventional maximal isoinertial resistance loading protocol. Countermovement jump (CMJ) and maximal voluntary isometric contraction (MVC) performance was measured on three occasions: at baseline, immediately post and 48h post. The results indicated that the decrease in MVC (9.7%) is greater than or comparable with the CMJ output variables (4.2-10.3%), immediately post exercise. Whilst isometric strength had demonstrated a full recovery at 48h post, many of the key CMJ output variables were still impaired (P <0.05). Similar findings were observed in the normalised CMJ curves. Complete recovery of the ability to rapidly produced force may require more than 48h in many athletes. Individual responses should therefore be monitored to help plan acute and chronic training loads. It is recommended that future fatigue studies should incorporate temporal phase analyses to consider the power-, force-, velocity-, and displacement-time curves.

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KW - rest

KW - sports

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