{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,24]],"date-time":"2026-07-24T17:18:30Z","timestamp":1784913510573,"version":"3.55.0"},"reference-count":33,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2025,3,27]],"date-time":"2025-03-27T00:00:00Z","timestamp":1743033600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JFMK"],"abstract":"<jats:p>Background\/Objectives: Hip abductor weakness is a common issue in patients with lower back pain, knee osteoarthritis, and hip disorders, and compromises pelvic stability, gait control, and function. Side-lying hip abduction exercises are widely used as safe and effective interventions for patients unable to perform high-load or weight-bearing activities. However, the influence of ankle joint angles and distal muscle activity on the hip abductor muscles remains unclear. This study aimed to investigate the effects of ankle joint angles and activation states on unilateral right hip abductor strength and muscle activity. Methods: Fifteen healthy male adults (29.1 \u00b1 5.4 years) participated. Surface electromyography (EMG) was used to measure the activity of the tensor fasciae latae (TFL), gluteus medius (G-med), gluteus maximus, tibialis anterior, and medial gas-trocnemius muscles. Hip abduction strength was evaluated in a side-lying position with the ankle positioned at three angles (neutral, dorsiflexion, and plantarflexion) and in three activation states (no activation, maximal dorsiflexion, and maximal plantarflexion). Two-factor (3 \u00d7 3) repeated measures ANOVA was used to analyze strength and EMG activity. Results: ANOVA revealed a significant interaction effect. The results of the simple main effects showed significantly higher hip abduction strength in dorsiflexion than in the neutral position and plantarflexion (p &lt; 0.001). TFL and G-med EMG activities peaked during dorsiflexion, particularly under maximal dorsiflexion. Conclusions: These findings suggest that dorsiflexion enhances hip abductor strength and activity by increasing fascial tension (lateral line and superficial backline) and improving limb alignment. This approach may provide effective rehabilitation strategies. This is a load-adjustable training recovery approach that should be confirmed with future intervention studies.<\/jats:p>","DOI":"10.3390\/jfmk10020110","type":"journal-article","created":{"date-parts":[[2025,3,27]],"date-time":"2025-03-27T12:41:02Z","timestamp":1743079262000},"page":"110","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Effects of Ankle Joint Angles and Surrounding Muscles on Hip Joint Musculature"],"prefix":"10.3390","volume":"10","author":[{"given":"Yuta","family":"Murata","sequence":"first","affiliation":[{"name":"Furu Clinic, 1098 Konancho Terasho, Koka 520-3301, Japan"},{"name":"Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7669-6719","authenticated-orcid":false,"given":"Noriyuki","family":"Kida","sequence":"additional","affiliation":[{"name":"Faculty of Arts and Sciences, Kyoto Institute of Technology, Kyoto 606-8585, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takumi","family":"Jiromaru","sequence":"additional","affiliation":[{"name":"Department of Physical Therapy, School of Health Science, Bukkyo University, Kyoto 604-8418, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michio","family":"Wachi","sequence":"additional","affiliation":[{"name":"Department of Physical Therapy, School of Health Science, Bukkyo University, Kyoto 604-8418, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kohei","family":"Yoshikawa","sequence":"additional","affiliation":[{"name":"Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan"},{"name":"Kanazawa Orthopaedic and Sports Medicine Clinic, 881 Ono, Ritto 520-3016, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shinichi","family":"Noguchi","sequence":"additional","affiliation":[{"name":"Department of Physical Therapy, School of Rehabilitation, Biwako Professional University of Rehabilitation, Higashiomi 527-0145, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hitoshi","family":"Onishi","sequence":"additional","affiliation":[{"name":"Department of Physical Therapy, School of Rehabilitation, Biwako Professional University of Rehabilitation, Higashiomi 527-0145, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,3,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1597","DOI":"10.1093\/ptj\/63.10.1597","article-title":"Timing and relative intensity of hip extensor and abductor muscles action during level and stair ambulation. An EMG study","volume":"63","author":"Lyons","year":"1983","journal-title":"Phys. Ther."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"159","DOI":"10.1016\/S0966-6362(02)00073-5","article-title":"Individual muscle contributions to support in normal walking","volume":"17","author":"Anderson","year":"2003","journal-title":"Gait Posture"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"2623","DOI":"10.1016\/j.jbiomech.2005.08.017","article-title":"Muscles that support the body also modulate forward progression during walking","volume":"39","author":"Liu","year":"2006","journal-title":"J. Biomech."},{"key":"ref_4","first-page":"177","article-title":"Gait analysis before or after varus osteotomy of the femur for hip osteoarthritis","volume":"8","author":"Watanabe","year":"1998","journal-title":"Bio-Med. Mater. Eng."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"507","DOI":"10.1002\/ca.23064","article-title":"Atrophy of hip abductor muscles is related to clinical severity in a hip osteoarthritis population","volume":"31","author":"Zacharias","year":"2018","journal-title":"Clin. Anat."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"95","DOI":"10.1016\/j.jbmt.2012.06.001","article-title":"The muscular force transmission system: Role of the intramuscular connective tissue","volume":"17","author":"Turrina","year":"2013","journal-title":"J. Bodyw. Mov. Ther."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"708","DOI":"10.1016\/j.jelekin.2007.02.003","article-title":"Epimuscular myofascial force transmission between antagonistic and synergistic muscles can explain movement limitation in spastic paresis","volume":"17","author":"Huijing","year":"2007","journal-title":"J. Electromyogr. Kinesiol."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"101","DOI":"10.1016\/S0167-9457(01)00057-4","article-title":"Effects of proprioceptive neuromuscular facilitation on the initiation of voluntary movement and motor evoked potentials in upper limb muscles","volume":"21","author":"Shimura","year":"2002","journal-title":"Hum. Mov. Sci."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"181","DOI":"10.1016\/j.jcm.2020.07.003","article-title":"The proprioceptive neuromuscular facilitation concept in Parkinson disease: A systematic review and meta-analysis","volume":"19","author":"Luvizutto","year":"2020","journal-title":"J. Chiropr. Med."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"904","DOI":"10.1016\/j.jbmt.2017.11.006","article-title":"Quadriceps force production during straight leg raising at different hip positions with and without concomitant ankle dorsiflexion","volume":"22","author":"Mikaili","year":"2018","journal-title":"J. Bodyw. Mov. Ther."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"253","DOI":"10.1016\/j.gaitpost.2012.11.020","article-title":"Muscle function during gait is invariant to age when walking speed is controlled","volume":"38","author":"Lim","year":"2013","journal-title":"Gait Posture"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1138","DOI":"10.1016\/S0003-9993(95)80123-5","article-title":"Ankle inversion injury and hypermobility: Effect on hip and ankle muscle electromyography onset latency","volume":"76","author":"Beckman","year":"1995","journal-title":"Arch. Phys. Med. Rehabil."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"A1","DOI":"10.2519\/jospt.2014.0303","article-title":"Heel pain-plantar fasciitis: Revision 2014","volume":"44","author":"Martin","year":"2014","journal-title":"J. Orthop. Sports Phys. Ther."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"368","DOI":"10.1123\/jsr.2019-0310","article-title":"Effect of isometric hip abduction on foot and ankle muscle activity and medial longitudinal arch during short-foot exercise in individuals with pes Planus","volume":"30","author":"Choi","year":"2020","journal-title":"J. Sport Rehabil."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1428","DOI":"10.1016\/j.apmr.2006.07.264","article-title":"Outcomes of a weight-bearing rehabilitation program for patients diagnosed with patellofemoral pain syndrome","volume":"87","author":"Boling","year":"2006","journal-title":"Arch. Phys. Med. Rehabil."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"487","DOI":"10.2519\/jospt.2005.35.8.487","article-title":"Electromyographic analysis of hip rehabilitation exercises in a group of healthy subjects","volume":"35","author":"Bolgla","year":"2005","journal-title":"J. Orthop. Sports Phys. Ther."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"668","DOI":"10.26603\/ijspt20180668","article-title":"Electromyographic analysis of gluteus maximus, gluteus medius, and tensor fascia latae during therapeutic exercises with and without elastic resistance","volume":"13","author":"Bishop","year":"2018","journal-title":"Int. J. Sports Phys. Ther."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"446","DOI":"10.1016\/j.jelekin.2006.05.001","article-title":"Transcranial magnetic stimulation during resistance training of the tibialis anterior muscle","volume":"17","author":"Griffin","year":"2007","journal-title":"J. Electromyogr. Kinesiol."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"3081","DOI":"10.1589\/jpts.27.3081","article-title":"Comparison of toe grip strength and muscle activities during maximal toe grip strength exertion according to the presence\/absence of an ankle immobilization belt","volume":"27","author":"Soma","year":"2015","journal-title":"J. Phys. Ther. Sci."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"815","DOI":"10.1519\/JSC.0b013e3181aa36b8","article-title":"The reliability and validity of handheld dynamometry for the measurement of lower-extremity muscle strength in older adults","volume":"24","author":"Arnold","year":"2010","journal-title":"J. Strength Cond. Res."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"697","DOI":"10.1002\/ca.22004","article-title":"A review of the anatomy of the hip abductor muscles, gluteus medius, gluteus minimus, and tensor fascia lata","volume":"25","author":"Flack","year":"2012","journal-title":"Clin. Anat."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"82","DOI":"10.2519\/jospt.2010.3025","article-title":"Kinesiology of the hip: A focus on muscular actions","volume":"40","author":"Neumann","year":"2010","journal-title":"J. Orthop. Sports Phys. Ther."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"579","DOI":"10.1111\/joa.13575","article-title":"Distinct displacement of the superficial and deep fascial layers of the iliotibial band during a weight shift task in runners: An exploratory study","volume":"240","author":"Besomi","year":"2022","journal-title":"J. Anat."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"329","DOI":"10.1016\/S0021-9290(98)00186-9","article-title":"Muscle as a collagen fiber reinforced composite: A review of force transmission in muscle and whole limb","volume":"32","author":"Huijing","year":"1999","journal-title":"J. Biomech."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"92","DOI":"10.1093\/ptj\/86.1.92","article-title":"Structure and biomechanics of peripheral nerves: Nerve responses to physical stresses and implications for physical therapist practice","volume":"86","author":"Topp","year":"2006","journal-title":"Phys. Ther."},{"key":"ref_26","unstructured":"Sunderland, S. (1978). Nerves and Nerve Injuries, Churchill Livingstone. [2nd ed.]."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Negro, F., and Farina, D. (2012). Factors influencing the estimates of correlation between motor unit activities in Humans Negro. PLoS ONE, 7.","DOI":"10.1371\/journal.pone.0044894"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"130","DOI":"10.1016\/j.physio.2009.09.007","article-title":"Effect of the abdominal draw-in manoeuvre in combination with ankle dorsiflexion in strengthening the transverse abdominal muscle in healthy young adults: A preliminary, randomised, controlled study","volume":"96","author":"Chon","year":"2010","journal-title":"Physiotherapy"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"463","DOI":"10.1007\/s00221-020-05973-x","article-title":"Inter-muscle differences in modulation of motor evoked potentials and posterior root-muscle reflexes evoked from lower-limb muscles during agonist and antagonist muscle contractions","volume":"239","author":"Saito","year":"2021","journal-title":"Exp. Brain Res."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"1057","DOI":"10.3233\/BMR-200108","article-title":"Is it appropriate to use external loads during side-lying hip abduction exercise for weakened gluteus medius?","volume":"34","author":"Nam","year":"2021","journal-title":"J. Back Musculoskelet. Rehabil."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"418","DOI":"10.1123\/jsr.2016-0088","article-title":"A systematic review of rehabilitation exercises to progressively load the gluteus medius","volume":"26","author":"Ebert","year":"2017","journal-title":"J. Sport Rehabil."},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Monselli, C., Bianco Prevot, L., Accetta, R., Tronconi, L.P., Bolcato, V., and Basile, G. (2024). State of the art in rehabilitation strategies after hip arthroscopy for femoroacetabular impingement syndrome: A systematic review. J. Clin. Med., 13.","DOI":"10.3390\/jcm13237302"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"201","DOI":"10.1097\/PHM.0000000000000155","article-title":"Effect of hip abduction exercise with manual pelvic fixation on recruitment of deep trunk muscles","volume":"94","author":"Kim","year":"2015","journal-title":"Am. J. Phys. Med. Rehabil."}],"container-title":["Journal of Functional Morphology and Kinesiology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2411-5142\/10\/2\/110\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T17:03:34Z","timestamp":1760029414000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2411-5142\/10\/2\/110"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,3,27]]},"references-count":33,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2025,6]]}},"alternative-id":["jfmk10020110"],"URL":"https:\/\/doi.org\/10.3390\/jfmk10020110","relation":{},"ISSN":["2411-5142"],"issn-type":[{"value":"2411-5142","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,3,27]]}}}