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Influence of acute eccentric exercise on the H:Q ratio.
Int J Sports Med. 2011 Dec; 32(12):935-9.IJ

Abstract

The purpose of the present study was to examine the effects of an acute bout of eccentric exercise on maximal isokinetic concentric peak torque (PT) of the leg flexors and extensors and the hamstrings-to-quadriceps (H:Q) strength ratio. Sixteen male (mean±SD: age=20.9±2 years; stature=177.0±4.4 cm; mass=76.8±10.0 kg) volunteers performed maximal, concentric isokinetic leg extension and flexion muscle actions at 60°·sec - 1 before and after (24-72 h) a bout of eccentric exercise. The eccentric exercise protocol consisted of 4 sets of 10 repetitions for the leg press, leg extension, and leg curl exercises at 120% of the concentric one repetition maximum (1-RM). The results indicated that the acute eccentric exercise protocol resulted in a significant (P<0.05) decrease in isokinetic leg flexion (13-19%) and leg extension (11-16%) PT 24-72 h post-exercise. However, the H:Q ratios were unaltered by the eccentric exercise protocol. These findings suggest that an acute bout of eccentric exercise utilizing both multi - and single - joint dynamic constant external resistance (DCER) exercises results in similar decreases in maximal isokinetic strength of the leg flexors and extensors, but does not alter the H:Q ratio.

Authors+Show Affiliations

Oklahoma State University, Health and Human Performance, Stillwater, Oklahoma, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

22095326

Citation

Thompson, B J., et al. "Influence of Acute Eccentric Exercise On the H:Q Ratio." International Journal of Sports Medicine, vol. 32, no. 12, 2011, pp. 935-9.
Thompson BJ, Smith DB, Sobolewski EJ, et al. Influence of acute eccentric exercise on the H:Q ratio. Int J Sports Med. 2011;32(12):935-9.
Thompson, B. J., Smith, D. B., Sobolewski, E. J., Fiddler, R. E., Everett, L., Klufa, J. L., & Ryan, E. D. (2011). Influence of acute eccentric exercise on the H:Q ratio. International Journal of Sports Medicine, 32(12), 935-9. https://doi.org/10.1055/s-0031-1283184
Thompson BJ, et al. Influence of Acute Eccentric Exercise On the H:Q Ratio. Int J Sports Med. 2011;32(12):935-9. PubMed PMID: 22095326.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of acute eccentric exercise on the H:Q ratio. AU - Thompson,B J, AU - Smith,D B, AU - Sobolewski,E J, AU - Fiddler,R E, AU - Everett,L, AU - Klufa,J L, AU - Ryan,E D, Y1 - 2011/11/17/ PY - 2011/11/19/entrez PY - 2011/11/19/pubmed PY - 2012/3/29/medline SP - 935 EP - 9 JF - International journal of sports medicine JO - Int J Sports Med VL - 32 IS - 12 N2 - The purpose of the present study was to examine the effects of an acute bout of eccentric exercise on maximal isokinetic concentric peak torque (PT) of the leg flexors and extensors and the hamstrings-to-quadriceps (H:Q) strength ratio. Sixteen male (mean±SD: age=20.9±2 years; stature=177.0±4.4 cm; mass=76.8±10.0 kg) volunteers performed maximal, concentric isokinetic leg extension and flexion muscle actions at 60°·sec - 1 before and after (24-72 h) a bout of eccentric exercise. The eccentric exercise protocol consisted of 4 sets of 10 repetitions for the leg press, leg extension, and leg curl exercises at 120% of the concentric one repetition maximum (1-RM). The results indicated that the acute eccentric exercise protocol resulted in a significant (P<0.05) decrease in isokinetic leg flexion (13-19%) and leg extension (11-16%) PT 24-72 h post-exercise. However, the H:Q ratios were unaltered by the eccentric exercise protocol. These findings suggest that an acute bout of eccentric exercise utilizing both multi - and single - joint dynamic constant external resistance (DCER) exercises results in similar decreases in maximal isokinetic strength of the leg flexors and extensors, but does not alter the H:Q ratio. SN - 1439-3964 UR - https://wwww.unboundmedicine.com/medline/citation/22095326/Influence_of_acute_eccentric_exercise_on_the_H:Q_ratio_ DB - PRIME DP - Unbound Medicine ER -