The Isokinetic Concept of Exercise

Hislop, Helen J.; Perrine, J. J.

doi:10.1093/ptj/47.1.114

Cited by 78 publications

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“…Isokinetics, a concept introduced in 1967 (36,59), has gained popularity in a variety of clinical applications. lsokinetic technology is used to strengthen muscle and to assess dysfunction (19,20,29,39,42,43,56,60).…”

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Comparison of Values Generated During Testing of the Knee Using the Cybex II Plus^®and Biodex Model B-2000^®Isokinetic Dynamometers

Thompson¹,

Shingleton²,

Kegerreis³

1989

J Orthop Sports Phys Ther

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Forty-eight, healthy, adult, volunteer subjects (20 males, 28 females) who ranged in age from 21-46 years were studied during isokinetic testing of the knee joint. The same knee of each subject was tested at speeds of 60, 180, and 240°/sec on both the Biodex Model 8-2000" and the Cybex I 1 Plus' isokinetic dynamometers. The following variables were compared: peak torques, angle of peak torques, peak torque to body weight ratios, and flexion to extension ratios. Analysis of correlation coefficients showed statistically significant (p < 0.05) relationships between several pairs of values. However, results of paired t-tests revealed many statistically significant (p < 0.05) and nonuniform differences. The nonuniform differences between data generated by the two brands of isokinetic dynamometers indicated that clinicians should exercise caution when attempting to extrapolate test data from one machine to another.Isokinetics, a concept introduced in 1967 (36, 59), has gained popularity in a variety of clinical applications. lsokinetic technology is used to strengthen muscle and to assess dysfunction (19,20,29,39,42,43,56,60). Other uses for isokinetic dynamometers include passive stretching, preemployment screening, industrial rehabilitation, determining return to competition status, and research (1 1, 24, 45, 46 0190-601

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mentioning

confidence: 99%

Comparison of Values Generated During Testing of the Knee Using the Cybex II Plus^®and Biodex Model B-2000^®Isokinetic Dynamometers

Thompson¹,

Shingleton²,

Kegerreis³

1989

J Orthop Sports Phys Ther

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“…Earlier studies reported ratios of 0.5, however the subjects of such studies did not involve athletes. 17,22 Gilliam10 et al found football players to have a flexor/extensor strength ratio of 0 . 6 .…”

Section: Hamstring/quadriceps Strength Ratiosmentioning

confidence: 99%

SAJSM 1990 No.1

2016

S Afr J SM

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“…Hasta kontraksiyon sırasında karşılayabileceğinden fazla bir kuvvete maruz kalmaz. Test güvenilirliği için hasta kooperasyonu son derece önemlidir (9).…”

Section: Introductionunclassified

Evaluation of Muscle Performance with Isokinetic Test in Patients Using Atorvastatin

Öztürk¹,

Topal²,

Özdemir³

et al. 2014

Turk J Phys Med Rehab

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Objective: Statins are widely used to lower LDL-cholesterol levels. Two of the most important side effects are hepatotoxicity and myopathy. Myopathy is rare and characterized by widespread muscle pain, fatigue, and increased serum creatine phosphokinase levels. In this study, we aimed to show if isokinetic muscle strength is affected in patients on statin therapy. Material and Methods: In this study, we evaluated the visual pain score, sense of weakness, serum creatine phosphokinase levels, and the power of knee muscles by using an isokinetic test that enables the quantitative and objective measurement of the performance of the musculoskeletal system before and after treatment of 26 patients who used 20 mg/day atorvastatin for 3 months. Results: Two patients had myalgia after treatment, and asymptomatic elevation of serum creatine phosphokinase was observed in one patient. Before and after the treatment, there was no statistically significant difference in visual pain scores and serum creatine phosphokinase levels. After treatment, flexion and extension peak torque values at 60°/s velocity were significantly reduced compared to the values before treatment. The effect of statins on mitochondrial phosphorylation and type 1 and type 2a fibers, which mainly use the oxidative path in the production of energy, may explain these results. Conclusion: In conclusion, in this study, 20 mg/day atorvastatin for 3 months caused a decrease in isokinetic muscle strength without causing an increase in serum creatine phosphokinase levels and clinically significant myopathy. Key Words: Atorvastatin, muscle performance, isokinetic test Özet Amaç: Statinler, LDL-kolesterol seviyesinin düşürülmesi için yaygın olarak kullanılırlar. En önemli iki yan etki, hepatotoksisite ve miyopatidir. Miyopati çok nadir görülür ve yaygın kas ağrıları, yorgunluk, serum kreatin fosfokinaz düzeylerinde artma ile karakterizedir. Bu çalışmada atorvastatin kullanan hastalarda, izokinetik kas güçlerindeki etkilenmenin gösterilmesi amaçlanmıştır. Gereç ve Yöntemler: Bu çalışmada 3 ay süreyle 20 mg/gün atorvastatin kullanan 26 hastada, tedavi öncesi ve sonrasında görsel ağrı skoru ile kuvvetsizlik hissi, serum kreatin fosfokinaz seviyeleri, kas-iskelet sistemi performansının niceliksel ve objektif ölçümüne olanak sağlayan izokinetik test ile diz kaslarının kuvveti değerlendirildi. Bulgular: İki hastada tedavi sonrasında miyalji semptomu gözlenirken, bir hastada asemptomatik serum kreatin fosfokinaz yüksekliği gözlendi. Hastaların tedavi öncesi ve sonrası görsel ağrı skorları ile serum kreatin fosfokinaz düzeyleri arasında istatistiksel olarak anlamlı farklılık saptanmadı. 60°/s hızda elde edilen fleksiyon ve ekstansiyon pik tork değerleri, tedavi öncesine göre anlamlı derecede azalmıştı. Bunun statin tedavisine bağlı olarak, mitokondriyal fosforilasyonun bozulması ve enerji üretiminde asıl olarak oksidatif yolu kullanan tip 1 ve tip 2a kas liflerinin etkilenmesine bağlı olabileceği düşünüldü. Sonuç: Bu çalışmada 3 ay süreyle 20 mg/gün atorvastatin ku...

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The Isokinetic Concept of Exercise

Cited by 78 publications

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Comparison of Values Generated During Testing of the Knee Using the Cybex II Plus^®and Biodex Model B-2000^®Isokinetic Dynamometers

Comparison of Values Generated During Testing of the Knee Using the Cybex II Plus^®and Biodex Model B-2000^®Isokinetic Dynamometers

SAJSM 1990 No.1

Evaluation of Muscle Performance with Isokinetic Test in Patients Using Atorvastatin

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The Isokinetic Concept of Exercise

Cited by 78 publications

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Comparison of Values Generated During Testing of the Knee Using the Cybex II Plus®and Biodex Model B-2000®Isokinetic Dynamometers

Comparison of Values Generated During Testing of the Knee Using the Cybex II Plus®and Biodex Model B-2000®Isokinetic Dynamometers

SAJSM 1990 No.1

Evaluation of Muscle Performance with Isokinetic Test in Patients Using Atorvastatin

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Comparison of Values Generated During Testing of the Knee Using the Cybex II Plus^®and Biodex Model B-2000^®Isokinetic Dynamometers

Comparison of Values Generated During Testing of the Knee Using the Cybex II Plus^®and Biodex Model B-2000^®Isokinetic Dynamometers