1
|
Jo D, Bilodeau M. Sex differences concerning the effects of ankle muscle fatigue on static postural control and spinal proprioceptive input at the ankle. Front Hum Neurosci 2023; 17:1015597. [PMID: 37476006 PMCID: PMC10355328 DOI: 10.3389/fnhum.2023.1015597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 06/21/2023] [Indexed: 07/22/2023] Open
Abstract
Aims The main aim of this study was to determine sex differences in postural control changes with ankle muscle fatigue during a standing forward leaning (FL) task under different vision conditions. The secondary aim was to examine sex differences in the effect of fatigue on soleus (SOL) H-reflex amplitude, a measure of motoneuron excitability with activation of Ia afferents. Methods Fifteen healthy young adult males (mean age: 28.0 years) and 16 healthy young adult females (mean age: 26.1 years) were asked to perform four consecutive FL tasks [30 s; two with eyes open (EO) and two with eyes closed (EC)] before, and immediately following a fatiguing exercise consisting of alternating ankle plantarflexion (6 s) and dorsiflexion (2 s) maximal isometric contractions, and at 5 and 10 min of recovery. Center of pressure (COP) sway variables (mean position, standard deviation, ellipse area, average velocity, and frequency), an ankle co-contraction index, and a ratio of SOL H-reflex to the maximum amplitude of the compound muscle action potential (M-max) were obtained during the FL tasks. A rating of perceived fatigue (RPF) was also documented at the different time points. Results Time to task failure (reduction of 50% in maximal voluntary isometric contraction torque of ankle plantar flexors) and the increase in RPF value were not significantly different between males and females. Both sex groups showed similar and significant increases (p < 0.05) in mean COP sway velocity with no significant changes in co-contraction indices. No significant effects of fatigue and related interactions were found for SOL H/M-max ratio. Discussion The absence of a significant sex difference in postural control change (sway and co-contraction) with fatigue could be explained by similar perceived (RPF) and performance fatigability (exercise duration) between males and females in the present study. Fatigue did not lead to significant changes in SOL spinal motoneuron excitability with activation of Ia afferents.
Collapse
Affiliation(s)
- Donguk Jo
- School of Rehabilitation Sciences, Faculty of Health Sciences, University of Ottawa, Ottawa, ON, Canada
- Aging and Movement Laboratory, Bruyère Research Institute, Ottawa, ON, Canada
| | - Martin Bilodeau
- School of Rehabilitation Sciences, Faculty of Health Sciences, University of Ottawa, Ottawa, ON, Canada
- Aging and Movement Laboratory, Bruyère Research Institute, Ottawa, ON, Canada
- School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, Ottawa, ON, Canada
- LIFE Research Institute, University of Ottawa, Ottawa, ON, Canada
| |
Collapse
|
2
|
Jo D, Pannetier M, Drouin S, Bassil S, Matte C, Bilodeau M. Sex differences in the effect of muscle fatigue on static postural control under different vision and task conditions. PLoS One 2022; 17:e0269705. [PMID: 35731747 PMCID: PMC9216616 DOI: 10.1371/journal.pone.0269705] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 05/25/2022] [Indexed: 11/18/2022] Open
Abstract
The main aim of this study was to compare the effects of ankle plantar flexors fatigue on postural control between healthy young adult males and females. The secondary aim was to determine the effects of vision on the fatigue-induced postural changes. Ten healthy young males and nine females were asked to perform quiet standing (QS) and standing forward lean (FL) tasks with eyes open (EO) and closed (EC) before and immediately following exercise, and throughout a 15-min recovery period. A sustained isometric exercise of ankle plantar flexors was performed until participants were no longer able to maintain a target torque of 50% of maximal voluntary isometric contraction (MVIC). Mean anteroposterior (AP) and mediolateral (ML) positions of the center of pressure (COP), mean COP sway velocity, and 95% ellipse area of COP sway were measured. Ankle plantar flexors fatigue had significant effects on all dependent variables, except for sway area. A fatigue X sex interaction was found for sway velocity with the most challenging task condition (FL-EC), where males showed a significant increase in sway velocity up to 15 min following exercise, whereas females did not. Fatigue X vision interactions for AP position were also found, with the withdrawal of vision leading to a greater backward shift during recovery for both the QS (5 to 15 min) and FL (5 to 10 min) tasks. Our findings suggest the use of different postural control strategies with ankle fatigue between males and females, and also a contribution of vision to compensate for fatigue-induced instability that is not dependent on task difficulty.
Collapse
Affiliation(s)
- Donguk Jo
- School of Rehabilitation Sciences, Faculty of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada
- Aging and Movement Laboratory, Bruyère Research Institute, Ottawa, Ontario, Canada
| | - Maya Pannetier
- School of Rehabilitation Sciences, Faculty of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada
| | - Sophie Drouin
- School of Rehabilitation Sciences, Faculty of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada
| | - Sarah Bassil
- School of Rehabilitation Sciences, Faculty of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada
| | - Caroline Matte
- School of Rehabilitation Sciences, Faculty of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada
| | - Martin Bilodeau
- School of Rehabilitation Sciences, Faculty of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada
- Aging and Movement Laboratory, Bruyère Research Institute, Ottawa, Ontario, Canada
- School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada
- * E-mail:
| |
Collapse
|
3
|
Hill M, Rosicka K, Wdowski M. Effect of sex and fatigue on quiet standing and dynamic balance and lower extremity muscle stiffness. Eur J Appl Physiol 2021; 122:233-244. [PMID: 34669045 DOI: 10.1007/s00421-021-04831-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 10/13/2021] [Indexed: 12/17/2022]
Abstract
PURPOSE The purpose of the present study was to determine whether there are sex differences in fatigue-induced changes in quiet standing and dynamic balance and establish whether changes in muscle torque and resting stiffness may explain the potential sex differences in balance responses. METHODS Sixteen recreationally active men (age; 24.8 ± 5.0 years, height; 178.2 ± 5.6 cm, mass; 77.8 ± 13.2 kg) and 10 women (age; 21.0 ± 1.6 years, height; 167 ± 5.3 cm, mass; 61.3 ± 8.9 kg) were assessed for postural sway, Y balance test performance, isokinetic and isometric knee extensor torque and resting stiffness of the vastus lateralis (VL), gastrocnemius lateralis (GL) and Achilles tendon (AT) before and immediately after fatiguing exercise. The fatigue protocol consisted of five sets of 20-drop jumps. RESULTS The fatiguing exercise elicited similar magnitude (effects size; ES) reductions in muscle torque (men; ES = 0.45-0.80, women; ES = 0.46-0.52), dynamic balance (men; ES = 0.45-0.74, women; ES = 0.47-0.79) and resting VL stiffness (men; ES = 0.46, women; ES = 0.36) in men and women (all p < 0.05). For quiet standing balance, fatigue induced an increase in postural sway metrics (ES = 0.64-1.28) and reduction in resting GL stiffness (ES = 0.40) in men (both p < 0.001) but not women (p > 0.05). CONCLUSION Fatiguing exercise, when producing a similar level of force reduction, induces similar magnitude reductions in dynamic postural control and resting VL stiffness in men and women. Distinct deteriorations in quiet standing balance in men but not women were accompanied by modifications in calf muscle stiffness following exercise-induced muscle fatigue.
Collapse
Affiliation(s)
- M Hill
- Centre for Sport, Exercise and Life Sciences, School of Life Sciences, Coventry University, Whitefriars Street, Coventry, CV1 2DS, UK.
| | - K Rosicka
- Department of Biological Sciences, Faculty of Physical Culture in Gorzów Wlkp., Poznań University of Physical Education, Gorzów Wlkp., Poznań, Poland
| | - M Wdowski
- Centre for Sport, Exercise and Life Sciences, School of Life Sciences, Coventry University, Whitefriars Street, Coventry, CV1 2DS, UK
| |
Collapse
|
4
|
Jo D, Bilodeau M. Rating of perceived exertion (RPE) in studies of fatigue-induced postural control alterations in healthy adults: Scoping review of quantitative evidence. Gait Posture 2021; 90:167-178. [PMID: 34492503 DOI: 10.1016/j.gaitpost.2021.08.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Revised: 07/12/2021] [Accepted: 08/22/2021] [Indexed: 02/02/2023]
Abstract
BACKGROUND Amongst the literature researching the effects of exercise-induced fatigue on postural control in healthy adults, many studies have used the Borg scales to document the rating of perceived exertion (RPE) and have shown a broad range of RPE values. Our main aim was to map fatigue-induced RPE values in included publications. Secondary aims were to summarize the preference and purpose for the use of Borg scales within the included publications and to explore the potential associations between fatigue-induced RPE values and postural control changes. METHODS Five databases (Ovid Medline, PubMed, CINAHL, Scopus, and SPORTDiscus) were systematically searched for synthesizing data among the publications that reported RPE values on the Borg RPE- and Category-Ratio (CR) 10 scales and also found fatigue effects on postural control in healthy adults. Spearman's rank correlations were conducted to assess potential associations between fatigue-induced RPE values and maximal postural control changes across the included publications (group data). RESULTS 45 of 51 studies included in this review reported maximal RPE values following exercise and ranged from 10.4-20 (6-20 Borg RPE) or 0.9-10 (CR10) indicating "very light" or "very weak" to "maximal" exertions. The 6-20 Borg and CR10 scales were mainly used to assess cardiovascular and muscular exertion, respectively. The scales were used mostly to estimate fatigue levels (n = 45), and to a lesser extent to produce a specific exercise intensity (n = 5) and as the criterion for exercise termination (n = 1). In general, there was no significant association between RPE and postural control changes across studies. CONCLUSION The broad range of RPE values and weak correlations may suggest that various fatigue levels can lead to postural control changes. However, one should be careful in comparing the extent of fatigue from RPE values and its potential effect on postural control in the light of many confounding factors.
Collapse
Affiliation(s)
- Donguk Jo
- School of Rehabilitation Sciences, Faculty of Health Sciences, University of Ottawa, 451 Smyth Road, Ottawa, ON, K1H 8M5, Canada; Aging and Movement Laboratory, Bruyère Research Institute, 43 Bruyère St, Ottawa, ON, K1N 5C8, Canada.
| | - Martin Bilodeau
- School of Rehabilitation Sciences, Faculty of Health Sciences, University of Ottawa, 451 Smyth Road, Ottawa, ON, K1H 8M5, Canada; Human Kinetics, Faculty of Health Sciences, University of Ottawa, 451 Smyth Road, Ottawa, ON, K1H 8M5, Canada; Aging and Movement Laboratory, Bruyère Research Institute, 43 Bruyère St, Ottawa, ON, K1N 5C8, Canada.
| |
Collapse
|
5
|
Penedo T, Polastri PF, Rodrigues ST, Santinelli FB, Costa EDC, Imaizumi LFI, Barbieri RA, Barbieri FA. Motor strategy during postural control is not muscle fatigue joint-dependent, but muscle fatigue increases postural asymmetry. PLoS One 2021; 16:e0247395. [PMID: 33630950 PMCID: PMC7906473 DOI: 10.1371/journal.pone.0247395] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 02/06/2021] [Indexed: 11/29/2022] Open
Abstract
The aim of this study was to investigate the effects of ankle and hip muscle fatigue on motor adjustments (experiment 1) and symmetry (experiment 2) of postural control during a quiet standing task. Twenty-three young adults performed a bipedal postural task on separate force platforms, before and after a bilateral ankle and hip muscle fatigue protocol (randomized). Ankle and hip muscles were fatigued separately using a standing calf raise protocol (ankle fatigue) on a step and flexion and extension of the hip (hip fatigue) sitting on a chair, at a controlled movement frequency (0.5Hz), respectively. In both experiments, force, center of pressure, and electromyography parameters were measured. The symmetry index was used in experiment 2 to analyze the postural asymmetry in the parameters. Our main findings showed that muscle fatigue impaired postural stability, regardless of the fatigued muscle region (i.e., ankle or hip). In addition, young adults used an ankle motor strategy (experiment 1) before and after both the ankle and hip muscle fatigue protocols. Moreover, we found increased asymmetry between the lower limbs (experiment 2) during the quiet standing task after muscle fatigue. Thus, we can conclude that the postural motor strategy is not muscle fatigue joint-dependent and a fatigue task increases postural asymmetry, regardless of the fatigued region (hip or ankle). These findings could be applied in sports training and rehabilitation programs with the objective of reducing the fatigue effects on asymmetry and improving balance.
Collapse
Affiliation(s)
- Tiago Penedo
- Department of Physical Education, Human Movement Research Laboratory (MOVI-LAB), Graduate Program in Human Movement, School of Sciences, São Paulo State University (UNESP), Bauru, São Paulo, Brazil
| | - Paula Favaro Polastri
- Department of Physical Education, Laboratory of Information, Vision and Action (LIVIA), Graduate Program in Human Movement, School of Sciences, São Paulo State University (UNESP), Bauru, São Paulo, Brazil
| | - Sérgio Tosi Rodrigues
- Department of Physical Education, Laboratory of Information, Vision and Action (LIVIA), Graduate Program in Human Movement, School of Sciences, São Paulo State University (UNESP), Bauru, São Paulo, Brazil
| | - Felipe Balistieri Santinelli
- Department of Physical Education, Human Movement Research Laboratory (MOVI-LAB), Graduate Program in Human Movement, School of Sciences, São Paulo State University (UNESP), Bauru, São Paulo, Brazil
| | - Elisa de Carvalho Costa
- Department of Physical Education, Human Movement Research Laboratory (MOVI-LAB), Graduate Program in Human Movement, School of Sciences, São Paulo State University (UNESP), Bauru, São Paulo, Brazil
| | - Luis Felipe Itikawa Imaizumi
- Department of Physical Education, Human Movement Research Laboratory (MOVI-LAB), Graduate Program in Human Movement, School of Sciences, São Paulo State University (UNESP), Bauru, São Paulo, Brazil
| | - Ricardo Augusto Barbieri
- Centro Universitário Estácio de Ribeirão Preto, Ribeirão Preto, São Paulo, Brazil
- Graduate Program in Physical Education and Sport at School of Physical Education and Sport of Ribeirao Preto (EEFERP), University of São Paulo (USP), Ribeirão Preto, São Paulo, Brazil
| | - Fabio Augusto Barbieri
- Department of Physical Education, Human Movement Research Laboratory (MOVI-LAB), Graduate Program in Human Movement, School of Sciences, São Paulo State University (UNESP), Bauru, São Paulo, Brazil
- * E-mail:
| |
Collapse
|
6
|
Hwang KJ, Ryu YU. Whole body vibration may have immediate adverse effects on the postural sway of stroke patients. J Phys Ther Sci 2016; 28:473-7. [PMID: 27064678 PMCID: PMC4792993 DOI: 10.1589/jpts.28.473] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Accepted: 10/31/2015] [Indexed: 11/24/2022] Open
Abstract
[Purpose] This study applied whole body vibration (WBV) at different vibration
frequencies to chronic stroke patients and examined its immediate effect on their postural
sway. [Subjects and Methods] A total of 14 (5 males, 9 females) stroke patients
participated. The subjects were randomly assigned to one of the two vibration frequency
groups (10 Hz and 40 Hz). Right before and after the application of WBV, the subjects
performed quiet standing for 30 seconds, and COP parameters (range, total distance, and
mean velocity) were analyzed. [Results] The 10 Hz WBV did not affect the postural sway of
stroke patients. The 40 Hz WBV increased postural sway in the ML direction. [Conclusion]
The results suggest that WBV application to stroke patients in the clinical field may have
adverse effects and therefore caution is necessary.
Collapse
Affiliation(s)
- Ki Jin Hwang
- Department of Physical Therapy, Graduate School, Catholic University of Daegu, Republic of Korea
| | - Young Uk Ryu
- Department of Physical Therapy, College of Medical Science, Catholic University of Daegu, Republic of Korea
| |
Collapse
|
7
|
Garcia MG, Läubli T, Martin BJ. Long-Term Muscle Fatigue After Standing Work. HUMAN FACTORS 2015; 57:1162-73. [PMID: 26048874 DOI: 10.1177/0018720815590293] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2015] [Accepted: 05/12/2015] [Indexed: 05/23/2023]
Abstract
OBJECTIVE The aims of this study were to determine long-term fatigue effects in the lower limbs associated with standing work and to estimate possible age and gender influences. BACKGROUND The progressive accumulation of muscle fatigue effects is assumed to lead to musculoskeletal disorders, as fatigue generated by sustained low-level exertions exhibits long-lasting effects. However, these effects have received little attention in the lower limbs. METHOD Fourteen men and 12 women from two different age groups simulated standing work for 5 hr including 5-min seated rest breaks and a 30-min lunch. The younger group was also tested in a control day. Muscle fatigue was quantified by electrically induced muscle twitches (muscle twitch force [MTF]), postural stability, and subjective evaluation of discomfort. RESULTS MTF showed a significant fatigue effect after standing work that persisted beyond 30 min after the end of the workday. MTF was not affected on the control day. The center of pressure displacement speed increased significantly over time after standing work but was also affected on the control day. Subjective evaluations of discomfort indicated a significant increase in perception of fatigue immediately after the end of standing work; however, this perception did not persist 30 min after. Age and gender did not influence fatigue. CONCLUSION Objective measures show the long-term effects of muscle fatigue after 5 hr of standing work; however, this fatigue is no longer perceived after 30 min of rest postwork. APPLICATION The present results suggest that occupational activities requiring prolonged standing are likely to contribute to lower-extremity and/or back disorders.
Collapse
|
8
|
Vieira MF, de Avelar IS, Silva MS, Soares V, Lobo da Costa PH. Effects of four days hiking on postural control. PLoS One 2015; 10:e0123214. [PMID: 25902060 PMCID: PMC4406731 DOI: 10.1371/journal.pone.0123214] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Accepted: 02/28/2015] [Indexed: 11/19/2022] Open
Abstract
Hiking is a demanding form of exercise that may cause delayed responses of the postural muscles and a loss of somatosensory information, particularly when repeatedly performed for several days. These effects may negatively influence the postural control of hikers. Therefore, the aim of this study was to investigate the effects of a four-day hike on postural control. Twenty-six adults of both sexes travelled 262 kilometers, stopping for lunch and resting in the early evening each day. Force platforms were used to collect center of pressure (COP) data at 100 Hz for 70 seconds before hiking started and immediately after arriving at the rest station each day. The COP time course data were analyzed according to global stabilometric descriptors, spectral analysis and structural descriptors using sway density curve (SDC) and stabilometric diffusion analysis (SDA). Significant increases were found for global variables in both the anterior-posterior and medial-lateral directions (COP sway area, COP total sway path, COP mean velocity, COP root mean square value and COP range). In the spectral analysis, only the 80% power frequency (F80) in the anterior-posterior direction showed a significant increase, reflecting the increase of the sway frequencies. The SDC revealed a significant increase in the mean distance between peaks (MD) and a significant decrease in the mean peak amplitudes (MP), suggesting that a larger torque amplitude is required for stabilization and that the postural stability is reduced. The SDA revealed a decrease in the long-term slope (Hl) and increases in the short-term (Ks) and the long-term (Kl) intercepts. We considered the likelihood that the presence of local and general fatigue, pain and related neuromuscular adaptations and somatosensory deficits may have contributed to these postural responses. Together, these results demonstrated that four days of hiking increased sway frequencies and deteriorated postural control in the standing position.
Collapse
Affiliation(s)
- Marcus Fraga Vieira
- Bioengineering and Biomechanics Laboratory, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
- * E-mail:
| | - Ivan Silveira de Avelar
- Bioengineering and Biomechanics Laboratory, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Maria Sebastiana Silva
- Bioengineering and Biomechanics Laboratory, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Viviane Soares
- Bioengineering and Biomechanics Laboratory, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | | |
Collapse
|
9
|
Kang JI, Moon YJ. Median Frequency Analysis of Shoulder Muscles Using EMG Power Spectrum Analysis After Rotator Cuff Repair. INTERNATIONAL JOURNAL OF CONTENTS 2014. [DOI: 10.5392/ijoc.2014.10.3.090] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
10
|
Degache F, Van Zaen J, Oehen L, Guex K, Trabucchi P, Millet G. Alterations in postural control during the world's most challenging mountain ultra-marathon. PLoS One 2014; 9:e84554. [PMID: 24465417 PMCID: PMC3897373 DOI: 10.1371/journal.pone.0084554] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Accepted: 11/15/2013] [Indexed: 11/18/2022] Open
Abstract
We investigated postural control (PC) effects of a mountain ultra-marathon (MUM): a 330-km trail run with 24000 m of positive and negative change in elevation. PC was assessed prior to (PRE), during (MID) and after (POST) the MUM in experienced ultra-marathon runners (n = 18; finish time = 126 ± 16 h) and in a control group (n = 8) with a similar level of sleep deprivation. Subjects were instructed to stand upright on a posturographic platform over a period of 51.2 seconds using a double-leg stance under two test conditions: eyes open (EO) and eyes closed (EC). Traditional measures of postural stability (center of pressure trajectory analysis) and stabilogram-diffusion analysis (SDA) parameters were analysed. For the SDA, a significantly greater short-term effective diffusion was found at POST compared with PRE in the medio-lateral (ML; Dxs) and antero-posterior (AP) directions (Dys) in runners (p<0.05) The critical time interval (Ctx) in the ML direction was significantly higher at MID (p<0.001) and POST (p<0.05) than at PRE in runners. At MID (p<0.001) and POST (p<0.05), there was a significant difference between the two groups. The critical displacement (Cdx) in the ML was significantly higher at MID and at POST (p<0.001) compared with PRE for runners. A significant difference in Cdx was observed between groups in EO at MID (p<0.05) and POST (p<0.005) in the ML direction and in EC at POST in the ML and AP directions (p<0.05). Our findings revealed significant effects of fatigue on PC in runners, including, a significant increase in Ctx (critical time in ML plan) in EO and EC conditions. Thus, runners take longer to stabilise their body at POST than at MID. It is likely that the mountainous characteristics of MUM (unstable ground, primarily uphill/downhill running, and altitude) increase this fatigue, leading to difficulty in maintaining balance.
Collapse
Affiliation(s)
- Francis Degache
- School of Health Sciences, Health Research Unit, University of Applied Sciences Western Switzerland, Lausanne, Switzerland
| | - Jérôme Van Zaen
- Applied Signal Processing Group, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Lukas Oehen
- Institute of Sports Sciences, Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
| | - Kenny Guex
- School of Health Sciences, Department of Physiotherapy, University of Applied Sciences Western Switzerland, Lausanne, Switzerland
| | | | - Gégoire Millet
- Institute of Sports Sciences, Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
| |
Collapse
|
11
|
Paillard T, Borel L. Unilateral and bilateral fatiguing contractions similarly alter postural stability but differently modify postural position on bipedal stance. Hum Mov Sci 2013; 32:353-62. [PMID: 23628361 DOI: 10.1016/j.humov.2012.12.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Accepted: 12/01/2012] [Indexed: 11/26/2022]
|
12
|
Paillard T. Effects of general and local fatigue on postural control: A review. Neurosci Biobehav Rev 2012; 36:162-76. [DOI: 10.1016/j.neubiorev.2011.05.009] [Citation(s) in RCA: 227] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2011] [Revised: 05/13/2011] [Accepted: 05/19/2011] [Indexed: 12/19/2022]
|