Previous high-intensity activity affects lower limb strength ratios

T Bampouras, D Orme, Nicola Relph, K Small

Research output: Contribution to conferencePoster

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Abstract

Abstract Lower limb strength ratios are important in assessing muscular imbalances. Typically, these ratios are derived from assessment of explosive, maximum effort activities. Such assessment can be functional or isokinetic. The single-effort nature of these assessments does not provide information on imbalance changes after muscular contractions. Any such change could indicate an increased risk of injury after a period of activity, thus raising questions as to the correct procedure of muscle imbalance assessment. Therefore, the aim of the current study was to assess muscle imbalances over maximum effort repeated cycling sprints. Seventeen healthy, physically active young adults (females: n=4, height 1.62±0.03 m, body mass 68.0±6.5 kg; males: n=13, height 1.80±0.06 m, body mass 80.5±13.8 kg) performed five 6-s sprints with 24-s rest interval on a Lode Excalibur bike with torque and power data recorded for each leg. Average, average maximum (average of maximum from each sprint) and peak torque (TAv, TAvM and TP respectively) and power (PAv, PAvM and PP respectively) were obtained for each leg. Ratios of these variables were calculated as Formula. Wilcoxon's test revealed a significantly stronger leg (p<0.05) for all torque and power variables. Friedman's test indicated a significant ratio increase between TAv (11.7±6.8%) and TAvM (4.6±3.0%, p=0.001) and TP (4.1±3.5%, p=0.001), as well as between PAv (8.8±5.0%) and PAvM (4.5±2.9%, p=0.003) and PP (4.2±2.6, p=0.003%) but not between TAvM and TP (p=0.421) or PAvM and PP (p=0.981). The results indicate that high-intensity activity increases lower limb strength imbalance, resulting in different ratios. The authors posit that muscle imbalance assessment activities conducted at rested state may not accurately reflect the true strength difference between limbs, leading to inaccurate training or rehabilitation advice.
Original languageEnglish
Pagesi19
DOIs
Publication statusPublished - 2010
EventInternational Sports Science & Sports Medicine Conference - Northumbria University, Newcastle, United Kingdom
Duration: 1 Aug 2010 → …

Conference

ConferenceInternational Sports Science & Sports Medicine Conference
CountryUnited Kingdom
CityNewcastle
Period1/08/10 → …

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Torque
Lower Extremity
Leg
Muscles
Extremities
Muscle Contraction
Young Adult
Rehabilitation
Wounds and Injuries

Cite this

Bampouras, T., Orme, D., Relph, N., & Small, K. (2010). Previous high-intensity activity affects lower limb strength ratios. i19. Poster session presented at International Sports Science & Sports Medicine Conference, Newcastle, United Kingdom. https://doi.org/10.1136/bjsm.2010.078972.57
Bampouras, T ; Orme, D ; Relph, Nicola ; Small, K. / Previous high-intensity activity affects lower limb strength ratios. Poster session presented at International Sports Science & Sports Medicine Conference, Newcastle, United Kingdom.
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abstract = "Abstract Lower limb strength ratios are important in assessing muscular imbalances. Typically, these ratios are derived from assessment of explosive, maximum effort activities. Such assessment can be functional or isokinetic. The single-effort nature of these assessments does not provide information on imbalance changes after muscular contractions. Any such change could indicate an increased risk of injury after a period of activity, thus raising questions as to the correct procedure of muscle imbalance assessment. Therefore, the aim of the current study was to assess muscle imbalances over maximum effort repeated cycling sprints. Seventeen healthy, physically active young adults (females: n=4, height 1.62±0.03 m, body mass 68.0±6.5 kg; males: n=13, height 1.80±0.06 m, body mass 80.5±13.8 kg) performed five 6-s sprints with 24-s rest interval on a Lode Excalibur bike with torque and power data recorded for each leg. Average, average maximum (average of maximum from each sprint) and peak torque (TAv, TAvM and TP respectively) and power (PAv, PAvM and PP respectively) were obtained for each leg. Ratios of these variables were calculated as Formula. Wilcoxon's test revealed a significantly stronger leg (p<0.05) for all torque and power variables. Friedman's test indicated a significant ratio increase between TAv (11.7±6.8{\%}) and TAvM (4.6±3.0{\%}, p=0.001) and TP (4.1±3.5{\%}, p=0.001), as well as between PAv (8.8±5.0{\%}) and PAvM (4.5±2.9{\%}, p=0.003) and PP (4.2±2.6, p=0.003{\%}) but not between TAvM and TP (p=0.421) or PAvM and PP (p=0.981). The results indicate that high-intensity activity increases lower limb strength imbalance, resulting in different ratios. The authors posit that muscle imbalance assessment activities conducted at rested state may not accurately reflect the true strength difference between limbs, leading to inaccurate training or rehabilitation advice.",
author = "T Bampouras and D Orme and Nicola Relph and K Small",
year = "2010",
doi = "10.1136/bjsm.2010.078972.57",
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Bampouras, T, Orme, D, Relph, N & Small, K 2010, 'Previous high-intensity activity affects lower limb strength ratios' International Sports Science & Sports Medicine Conference, Newcastle, United Kingdom, 1/08/10, pp. i19. https://doi.org/10.1136/bjsm.2010.078972.57

Previous high-intensity activity affects lower limb strength ratios. / Bampouras, T; Orme, D; Relph, Nicola; Small, K.

2010. i19 Poster session presented at International Sports Science & Sports Medicine Conference, Newcastle, United Kingdom.

Research output: Contribution to conferencePoster

TY - CONF

T1 - Previous high-intensity activity affects lower limb strength ratios

AU - Bampouras, T

AU - Orme, D

AU - Relph, Nicola

AU - Small, K

PY - 2010

Y1 - 2010

N2 - Abstract Lower limb strength ratios are important in assessing muscular imbalances. Typically, these ratios are derived from assessment of explosive, maximum effort activities. Such assessment can be functional or isokinetic. The single-effort nature of these assessments does not provide information on imbalance changes after muscular contractions. Any such change could indicate an increased risk of injury after a period of activity, thus raising questions as to the correct procedure of muscle imbalance assessment. Therefore, the aim of the current study was to assess muscle imbalances over maximum effort repeated cycling sprints. Seventeen healthy, physically active young adults (females: n=4, height 1.62±0.03 m, body mass 68.0±6.5 kg; males: n=13, height 1.80±0.06 m, body mass 80.5±13.8 kg) performed five 6-s sprints with 24-s rest interval on a Lode Excalibur bike with torque and power data recorded for each leg. Average, average maximum (average of maximum from each sprint) and peak torque (TAv, TAvM and TP respectively) and power (PAv, PAvM and PP respectively) were obtained for each leg. Ratios of these variables were calculated as Formula. Wilcoxon's test revealed a significantly stronger leg (p<0.05) for all torque and power variables. Friedman's test indicated a significant ratio increase between TAv (11.7±6.8%) and TAvM (4.6±3.0%, p=0.001) and TP (4.1±3.5%, p=0.001), as well as between PAv (8.8±5.0%) and PAvM (4.5±2.9%, p=0.003) and PP (4.2±2.6, p=0.003%) but not between TAvM and TP (p=0.421) or PAvM and PP (p=0.981). The results indicate that high-intensity activity increases lower limb strength imbalance, resulting in different ratios. The authors posit that muscle imbalance assessment activities conducted at rested state may not accurately reflect the true strength difference between limbs, leading to inaccurate training or rehabilitation advice.

AB - Abstract Lower limb strength ratios are important in assessing muscular imbalances. Typically, these ratios are derived from assessment of explosive, maximum effort activities. Such assessment can be functional or isokinetic. The single-effort nature of these assessments does not provide information on imbalance changes after muscular contractions. Any such change could indicate an increased risk of injury after a period of activity, thus raising questions as to the correct procedure of muscle imbalance assessment. Therefore, the aim of the current study was to assess muscle imbalances over maximum effort repeated cycling sprints. Seventeen healthy, physically active young adults (females: n=4, height 1.62±0.03 m, body mass 68.0±6.5 kg; males: n=13, height 1.80±0.06 m, body mass 80.5±13.8 kg) performed five 6-s sprints with 24-s rest interval on a Lode Excalibur bike with torque and power data recorded for each leg. Average, average maximum (average of maximum from each sprint) and peak torque (TAv, TAvM and TP respectively) and power (PAv, PAvM and PP respectively) were obtained for each leg. Ratios of these variables were calculated as Formula. Wilcoxon's test revealed a significantly stronger leg (p<0.05) for all torque and power variables. Friedman's test indicated a significant ratio increase between TAv (11.7±6.8%) and TAvM (4.6±3.0%, p=0.001) and TP (4.1±3.5%, p=0.001), as well as between PAv (8.8±5.0%) and PAvM (4.5±2.9%, p=0.003) and PP (4.2±2.6, p=0.003%) but not between TAvM and TP (p=0.421) or PAvM and PP (p=0.981). The results indicate that high-intensity activity increases lower limb strength imbalance, resulting in different ratios. The authors posit that muscle imbalance assessment activities conducted at rested state may not accurately reflect the true strength difference between limbs, leading to inaccurate training or rehabilitation advice.

U2 - 10.1136/bjsm.2010.078972.57

DO - 10.1136/bjsm.2010.078972.57

M3 - Poster

SP - i19

ER -

Bampouras T, Orme D, Relph N, Small K. Previous high-intensity activity affects lower limb strength ratios. 2010. Poster session presented at International Sports Science & Sports Medicine Conference, Newcastle, United Kingdom. https://doi.org/10.1136/bjsm.2010.078972.57