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PubMed1996

EMG-activity and muscular performance of lower leg during stretch-shortening cycle after cooling.

To test the effect of cooling on EMG-activity of muscles working as an agonist and antagonist in the lower leg, 12 men dressed in shorts and jogging shoes performed a drop-jump exercise after 60 min exposures to 27 degrees C and 10 degrees C. Cooling decreased mean skin temperature 5.6 +/- 0.4 degrees C (mean +/- SD, P < 0.001), whereas rectal temperature was unaffected. The muscle temperature measured from m. gastrocnemius medialis decreased 4.1 +/- 0.3 degrees C (P < 0.01) at the depth of 30 mm below skin surface. To find the optimal stretching velocity for potentiation of elastic energy, the drop-jump exercise was performed from six different bench heights (10, 20, 30, 40, 50, and 60 cm). The optimal velocity was not altered on account of cooling. In cooled subjects during the stretch phase of the drop jumps the EMG-activity of m. triceps surae complex (agonist) increased (P < 0.05-0.001) while the activity of m. tibialis anterior (antagonist) remained unchanged. After cooling during the shortening phase of the jumps the EMG-activity of m. triceps surae complex decreased (P < 0.05-0.001), whereas the activity of m. tibialis anterior increased (P < 0.05-0.001). In addition, after cooling the peak EMG-activity appeared on the average 28 ms earlier, which shifted the peak activity from the shortening phase (at 27 degrees C) to the stretch phase (at 10 degrees C). Cooling increased the mean duration of stretch and shortening phases by 28 +/- 3 ms (P < 0.001) and 23 +/- 2 ms (P < 0.001), respectively. The average force production during the shortening phase was 26% less (P < 0.05) after cooling, which resulted in a decreased rise of body centre of gravity (P < 0.05-0.01). It is concluded that during a stretch-shortening cycle cooling alters the EMG-activity of agonist and antagonist muscles on a contradictory manner and results in an earlier peak EMG-activity. Therefore, alterations in motor unit recruitment could be responsible for the prolonged muscle contraction and decreased force production on account of cooling.

Adult↗
PubMed2002

A case of cold-dependent exercise-induced anaphylaxis.

Exercise-induced anaphylaxis (EIA) is a form of physical urticaria that is induced by exercise. A 16-year-old Japanese boy had a 4-year history of recurrent wealing and dyspnoea after physical exercise such as jogging, playing handball or riding a bicycle in winter. The episodes were not associated with ingestion of foods including wheat or soya bean. A provocation test, with 15 min of exercise and 2 min of cold stimulation immediately before or immediately after the exercise, elicited a weal that was localized to the test area. A challenge test with ingestion of boiled soya beans and exercise did not elicit a weal. Therefore, in this case, cold exposure, but not food ingestion, was essential for inducing EIA. Cold-dependent EIA is different from cold urticaria, food-dependent EIA, cholinergic urticaria and cold-induced cholinergic urticaria, and may be a distinct entity.

Adolescent↗
PubMed1997

Both plasma and renal endothelin-1 participate in the acute cardiovascular response to exercise.

Plasma endothelin (ET-1) and renal endothelin are two distinct functional systems involved in maintaining blood volume. To investigate whether plasma and renal ET-1 participate in the cardiovascular response to exercise-induced hypovolaemia, we studied changes in plasma and urinary ET-1 in healthy non-professional athletes after 2 h of jogging performed both without and with drinking isotonic fluids. After the run, which caused a 13% plasma volume (PV) reduction, plasma and renal ET-1 (+117% and +118%) increased significantly (all P < 0.01). Fluid loss restitution during the run significantly attenuated either the PV contraction (-1.2%) and plasma and renal ET-1 increase (+2 and +3%). At multiple regression analysis changes in AVP plasma concentration, and not in PRA or PV per se, were significantly related to ET-1 changes both in plasma and urine. The present findings indicate that both plasma and renal ET-1 participate in the cardiovascular response to hypovolaemia induced by long-lasting, dynamic exercise.

Adult↗
PubMed2002

Partial and significant reversal of progressive visual and neurological deficits in multiple sclerosis: a possible therapeutic effect.

A 24-year-old woman developed over 18 months fluctuating and progressively increasing visual and cerebellar deficits, due to multiple sclerosis. The minimum visual acuities were 3/19 on the right and the perception of finger movement at 1 m on the left. She became able to walk only with a wide base and with support. Her condition deteriorated despite the use of methylprednisolone, prednisone and interferon beta-1b, so these were ceased. Azathioprine, 25 mg daily increasing to 100 mg daily, reducing following abnormal liver function tests to 50 mg daily, and glatiramer acetate 20 mg daily were commenced. The visual acuities two months later were 3/7.5 on the right and 3/6 on the left and after 4 months 3/4.5 on the right and 3/3 on the left. She was able after 2 months to walk unaided on a narrow base and after 4 months to jog half a kilometre without difficulty. Progressive multiple sclerosis has been held to be irreversible. The response in the present case therefore raises the possibility of a drug effect. It indicates the need for trials of combined immunomodulatory and immunosuppressive therapies in progressive multiple sclerosis.

Adult↗
PubMed2003

Oxygen uptake efficiency slope as monitoring tool for physical training in chronic hemodialysis patients.

The purpose of this study was to clarify the utility of oxygen uptake efficiency slope (OUES) as a monitoring tool, and to investigate the effects of physical training in chronic hemodialysis (HD) patients. Seventeen patients (Trained Group) received physical training 2-3 times per week for 20 weeks at the intervals between exercise tests. Patients underwent a combination training of bicycle ergometry, walking and jogging for 30 min duration. The intensity of physical training was adjusted to maintain the exercising heart rate at between 50 and 60% of the peak heart rate. Twelve patients (Control Group) lived without physical training throughout the 20 weeks. Both the Groups received the symptom limited exercise tests before and after the 20 week physical training. Minute ventilation (VE), carbon dioxide output (VCO2) and oxygen uptake (VO2) were continuously measured during the exercise tests. Oxygen uptake efficiency slope was derived from the logarithmic relation between VO2 and VE during an incremental exercise test. In the Trained Group, OUES after physical training (30.1 +/- 5.8) was significantly (P < 0.01) higher than that before physical training (25.2 +/- 2.6), while in the Control Group, OUES did not change in this study period of 20 weeks. In the Trained Group, changes in OUES correlated with those in the maximum oxygen uptake (r = 0.78, P < 0.001) and the anaerobic threshold (r = 0.61, P < 0.01). It was suggested that OUES was applicable as a monitoring tool for cardiorespiratory functional reserve during physical training in HD patients.

Adult↗
PubMed2003

The effects of physical exercise on plasma prebeta-1 high-density lipoprotein.

The impact of physical exercise on high-density lipoprotein (HDL) metabolism is recognized as a major mechanism of coronary artery disease (CAD) risk reduction. Prebeta-1 HDL subparticle species play a pivotal role in initiating reverse cholesterol transport (RCT). We examined the effect of acute physical exercise on plasma prebeta-1 HDL levels. Nineteen nonsmoking, healthy men (n = 11) and women (n = 8) not receiving lipid-altering medications completed dietary surveys, and had percent body fat determinations, and fasting blood drawn for measurements of plasma lipids, lipoproteins, apolipoprotein A-I (Apo A-I), and absolute and percent prebeta-1 HDL. Each subject completed cardiopulmonary exercise stress testing to Vo(2max) followed by a 4-km course of run-jogging. Laboratory measurements were repeated from blood drawn immediately after exercise. Mean +/- SD values were determined for age, percent body fat, dietary calories, dietary cholesterol, dietary fat, and plasma lipids, lipoproteins, Apo A-I, and absolute and percent prebeta-1 HDL using 1-way analysis of variance (ANOVA). One-way ANOVA comparisons were made for measurements of plasma lipids, lipoproteins, Apo A-I, and absolute and percent prebeta HDL measurements taken before and after exercise for all subjects combined. Entry characteristics showed the following (mean +/-SD): age, 24 +/- 5.8 years; body mass index (BMI), 22.4 +/- 2.6; percent body fat, 13 +/- 5.7; and Vo(2max), 49.1 +/- 7.9 mL O(2)/kg/min. Exercise significantly increased absolute plasma prebeta HDL (0.10 +/- 0.05 to 0.130 +/- 0.07 microg/mL, P =.039) and decreased plasma HDL-triglycerides (23.3 +/- 10.8 to 12.5 +/- 5.6 mg/dL, P =.012). Our findings indicate that prebeta-1 HDL and HDL-triglyceride metabolism are significant components of the effect of acute exercise on RCT. These findings have important relevance for studies pertaining to exercise-related effects on HDL metabolism as pertains to CAD risk reduction.

Adult↗
PubMed2000

Boxing and running lead to a rise in serum levels of S-100B protein.

Permanent neurological dysfunction is the primary medical concern of boxing. Recently it was reported that patients presenting elevated levels of the glial protein S-100B in serum after minor head injuries are more prone to develop neuropsychological deficits than patients with lower levels of S-100B protein. We assessed this protein before and after amateur boxing competitions (n = 10) and sparring bouts (n = 15). In several control groups, we investigated S-100B levels of participants before and after a 25 km race (n = 11), jogging (10 km, n = 12), short-term running (n = 12), and heading footballs (n = 12). There was an increase in S-100B protein after boxing and the running disciplines but not after ergometer cycling or soft heading of footballs. The increase in S-100B protein concentrations due to competitive boxing and after the 25 km race was significantly higher than that after performing other disciplines (p < 0.001). There was no significant difference between the increases caused by sparring and the running disciplines (p = 0.21). The number and severity of the strikes to the head correlated significantly with the increase in the S-100B protein levels. Levels of S-100B protein known to be associated with neuropsychological deficits were not reached in our study. In professional boxing, much higher levels are to be expected and would be worthy of investigation.

Adolescent↗
PubMed2004

[Injuries, training and driving technique of competitive mountain-bikers].

INTRODUCTION: There are only a few studies about mountain-biking. These give a statistical review of injuries in recreational sports - sometimes related to competition sports. This study was performed to evaluate injuries, training and driving style of professional cross-country-mountain-biker. METHODS: 49 professional mountain-bikers from Germany, Austria and Switzerland were interviewed retrospectively by standardised questionnaire. RESULTS: Most commonly the cervical spine and knee (each with 25.7 %) as well as the lumbar spine (22.8 %) are affected by recurrent disorders (n = 101). These disorders are more common in the pre-season and at the end of the season. The most common fracture is the clavicula fracture (n = 15). Ligament and tendon injuries are less frequent (n = 3). Most drivers choose jogging and cross-country for compensation and stretching and massage for regeneration. A regular training for trunk strength accomplish 27 of 49 drivers. Most drivers accomplish a specific strength training in the pre-season, some drivers practise also during the season. DISCUSSION: Recurrent disorders in the cervical and lumbar spine and the knee are the most common disorders in competitive mountainbikers. Trunk training should be emphasised. Further research is needed to improve driving technique to account for the reported disorders of the musculoskeletal system.

Athletic Injuries↗
PubMedDate not supplied

[Is running associated with premature degenerative arthritis of the hip? A systematic review].

AIM: The study was performed to investigated correlations between running and degenerative arthritis of the hip, according to the principles of evidence-based medicine. METHOD: The database Medline, the Cochrane Library, the centre for Evidence Based Medicine in Oxford and the sports science database Spolit, Spofor and Spowis were scanned systematically for the keywords "arthritis, osteoarthritis, degenerative, hip, sports, running, jogging, walking". RESULTS: 10 retrospective case control studies and 3 prospective studies were included for further analysis. The clinical examinations reported in the prospective studies did not reveal a significant difference between runners and non-runners. In one study a slightly increased risk for signs of arthritis at the X-ray was found in runners below 50 years with a very high mileage. No increased risk for degenerative arthritis was reported in most of the retrospective studies. A few authors of retrospective studies reported a slightly to moderately increased risk. The pooled estimate of the included studies showed a slightly increased risk for degenerative arthritis in runners (pooled OR 1.24 95 % CI 0.87-1.85). However, the increased risk did not reach a level of statistical significance. The graphic analysis of the data with the technique of the funnel plot gives an OR of 1.04. CONCLUSION: There is no evidence that running is associated with an increased risk for degenerative arthritis of the hip. There is no evidence for a different risk in men and women.

Case-Control Studies↗
PubMed2005

Muscle metabolism, temperature, and function during prolonged, intermittent, high-intensity running in air temperatures of 33 degrees and 17 degrees C.

Nine unacclimatized university sportsmen performed a prolonged, intermittent, high-intensity shuttle running test in hot (HT) (33 degrees C, dry bulb temperature, approximately 28 %, relative humidity) and moderate (MT) (17 degrees C, 63 %) environmental conditions. Subjects performed 60 m of walking, a 15-m sprint, 60 m of cruising ( approximately 85 % V.O (2max)), and 60 m of jogging ( approximately 45 %V.O (2max)) for 14.8 +/- 0.1 min followed by a 3-min rest, repeated until volitional exhaustion. The hot trial was performed first followed, 14 days later, by the moderate trial. During exercise subjects drank water ad libitum. Subjects ran almost twice as far in the moderate as in the hot trial (HT 11216 +/- 1411, MT 21644 +/- 1629, m, p < 0.01), and the decline in average 15-m sprint performance was greater in the heat (HT, 0.17 +/- 0.05, MT, 0.09 +/- 0.03, s, p < 0.05). Average heart rates, blood lactate and glucose, and plasma adrenaline and noradrenaline concentrations were greater in the HT (main effect trial, p < 0.01), as were serum cortisol concentration (main effect trial p < 0.05, n = 5) and muscle temperature (HT exhaustion vs. same time point in MT, 40.2 +/- 0.3 vs. 39.3 +/- 0.2, degrees C, p < 0.01). Peak torque during knee flexion and extension was not different pre-and post-exercise in the HT. Muscle glycogen utilization tended to be greater in the heat (HT 193.2 +/- 19.5, MT 143.8 +/- 23.9, mmol . kg dry wt (-1), p = 0.055, n = 8). In 7 out of the 8 subjects the increase in utilization was between 19 and just over 200 % greater in the HT. Glycogen remaining in the muscle at exhaustion was greater in the hot than moderate trial (HT 207.4 +/- 34.3, MT 126.5 +/- 46.8, mmol . kg dry wt (-1), p < 0.01, n = 8). Rectal temperature (T (rec)) was higher in the HT at exhaustion than at the same point in time in the moderate trial (HT, 39.60 +/- 0.15 vs. MT 38.75 +/- 0.10, degrees C, interaction trial-time, p < 0.01). There was a very strong negative relationship between rate of rise in T (rec) and distance completed in the HT (HT r = - 0.90, p < 0.01, MT r = - 0.76, p < 0.05). Thus, the earlier onset of exhaustion during prolonged intermittent shuttle running in the heat is associated with hyperthermia. However, while muscle glycogen utilization may be elevated by heat stress, low whole muscle glycogen concentrations would not seem to be the cause of this earlier exhaustion.

Adult↗
PubMed1993

The associations between family history of coronary heart disease, physical activity, dietary intake and body size.

Physical activity has been associated with coronary heart disease (CHD) as well as several CHD risk factors. In this study, we examine the association of a positive family history of CHD and physical activity on dietary intake and body size indicators among 891 healthy young adults (18 to 39 years of age) and 471 older adults (40 to 83) observed between 1980 and 1986. Participants reported the number of times per week they walked and/or jogged one mile, biked three miles, participated in sports, or performed other intense activities. Older men with a family history of CHD reported more physical activity than men without a family history of CHD (60% compared to 28.6%; p = 0.002). Younger women without a family history of CHD reported more physical activity than women with a family history of CHD (30.2% compared to 15.9%; p = 0.004). Fruit and vegetable intake increased with increasing levels of physical activity in younger adults. The only dietary association with family history was higher levels of fatty foods reported among older women with a family history versus those without a family history (p = 0.03). Young women with a family history of CHD were more likely to have higher BMI levels at all levels of physical activity and a higher percent of their ideal body weight per unit of physical activity (p = 0.01). For instance, young women who were most active with a family history of CHD were at 115% of their ideal body weight, while those without a family history were at 110.2% of their ideal body weight. There were no significant interactions between physical activity and CHD family history in this population. These findings suggest that family history of CHD alone may not be adequate to stimulate one to adopt a more healthy lifestyle.

Adolescent↗
PubMed1992

Recreational exercise does not impair menstrual cycles: a prospective study.

To determine whether recreational levels of training (jogging) will provoke short luteal phase menstrual cycles, a prospective study was conducted. Out of 132 women who initiated this study 57 completed it. These individuals were within normal range of cardiorespiratory fitness for 18-40-year-old women. After a control menstrual cycle (#1) and two additional menstrual cycles (#2 and #3) in which light calisthenics were performed, the subjects were then assigned to run less than 10 mi/wk, 10-20 mi/wk or 20-30 mi/wk for either two menstrual cycles (#4 and #5), or four menstrual cycles (#4, #5, #6, #7), followed by a detraining period lasting two menstrual cycles (i.e. #6 and #7 for the 2-month running groups; #8 and #9 for the 4-month running groups). Blood samples were obtained throughout every second menstrual cycle (i.e. cycles #1, #3, #5, #7, #9). Samples were assayed for LH, FSH and P. Body weight and body fat (%) were not altered by training (p greater than 0.05). Improvements in cardiovascular fitness did occur (p less than 0.05). No change in LH attributable to running was found in any of the 6 experimental groups (p greater than 0.05). In some of the groups quite large changes occurred in FSH (p less than 0.05), but there was no discernable pattern of onset of these changes among groups. Some increments in P were found (p less than 0.05) but again these were not consistent. Finally, in none of the six groups was an altered menstrual cycle length discernable (p greater than 0.05), nor was the luteal phase length altered (p greater than 0.05) by running. Therefore, in gynecologically mature women recreational running of up to 30 miles/week for 4 menstrual cycles has no deleterious effects upon their menstrual cycle.

Adult↗
PubMed1989

Results of the surgical treatment of the medial tibial syndrome in athletes.

The medial tibial syndrome (chronic compartment syndrome) is the most common specific overuse injury among athletes in Finland, and it is especially a problem in endurance sports, long-distance running, and jogging. Conservative treatment is usually successful, but if it fails, fasciotomy of the deep posterior compartment is observed to be beneficial. In the years 1975-1984, we performed fasciotomy in 34 patients, of whom 14 had a bilateral operation. Thirty-one patients were active in sports, 22 were long-distance runners and joggers. The operations of 15 patients (22 legs) were performed under local anesthesia as an outpatient procedure. The follow-up results in general were good. In 21 patients (78%) of those 27 who could be followed up, the final result was excellent or good, in 4 (15%) fair, and only in 2 (7%) poor. Fasciotomy is a simple operation and can be performed as an outpatient procedure under local anesthesia. For bilateral symptoms, we recommend two different procedures with a time interval of about 2 weeks to avoid the postoperative hematoma and difficulties in mobilization often seen, when operated simultaneously.

Adolescent↗
PubMed1993

[Biomechanical considerations of impact forces and foot stability in running].

The interaction between "man-shoe and surface" is presented as a model to discuss the complexity of human locomotion. Only if the physiological system "man" interacts positively with the physical requirements of shoe and surface quality running will become effective and economical. Especially during the early ground contact phase the hardness of the shoe construction determines the height of the vertical impact load. These adaptations have consequences in the emg amplitudes during the stretch activation phase of the contact. Comparing various jogging shoes with altered construction properties it can be shown that the "hardness" of the shoe material is well adapted by the variation in the emg amplitude. The influence of the amount of pronation on the impact forces has been confirmed in a separate study. Increased pronation resulted in an increased emg amplitude in the extensor muscles whereas activation in the flexor muscles was decreased. By means of different shoe and insole constructions it is possible to adjust the "man-shoe-surface" interaction to an optimum to carry loads by muscles, joints and ligaments and to avoid overuse and injuries.

Achilles Tendon↗
PubMed1987

Using perceived exertion to prescribe and monitor exercise training heart rate.

We examined whether feedback of heart rate (HR) or HR combined with ratings of perceived exertion (RPE and HR) during a graded exercise test (GXT) and during early trials of field training would reduce the errors commonly seen when training heart rate range (THR) is self-monitored by participants. Asymptomatic males (n = 24) were tested on a Balke treadmill protocol in a randomized, between-groups design under control conditions or conditions where feedback about HR or HR combined with RPE were given as age-predicted THR was approximated. This was followed on alternating days by three field trials of an 800-m jog where errors between prescribed and attained THR were fed back to each subject. A priori 95% confidence intervals for the first field trial showed that signed (algebraic) error for the HR combined with RPE condition (+3 bts/min) was less than for controls (+23.5 bts/min). Feedback of HR alone was no different from the control condition. All groups showed increased accuracy (P less than .05) by the third field trial [absolute error: T1 (18 bts/min) to T3 (9.6 bts/min); signed error: T1 (+14 bts/min) to T3 (+4 bts/min)]. Our results suggest feedback of HR combined with RPE during a GXT may reduce an overshoot in THR during the first of subsequent exercise sessions. Feedback of HR alone appeared sufficient to further reduce THR errors after a third exercise session in the field. The procedures used may have practical importance for sedentary, unfit, or diseased individuals where conservative HR prescriptions are desirable but electronic monitoring is not feasible or cost effective.

Adult↗
PubMed1982

Running performance as a function of the dose-response relationship to beta-adrenoceptor blockade.

There is a discrepancy between the effect of beta-blockade on exercise heart rate and the effect on exercise capacity. Thus, it was of interest to study the dose-response relationship between an unselective (propranolol) and a beta 1-selective (atenolol) blocker and endurance exercise performance. Nine habitually active males ran their own jogging route 10 times and the distances of the routes ranged between 4000 and 10000 m. Placebo (twice), 25, 50, 75, and 100 mg of atenolol and 40, 80, 120, and 160 mg of propranolol were administered orally with a double-blind, crossover procedure. After each experiment, running time and rate of perceived exertion (RPE) were registered. Small drug doses markedly affected exercise heart rates yet such doses minimally affected running performance when on the beta 1 selective blocker. With 160 mg propranolol, a greater exercise impairment occurred than with 100 mg atenolol (P less than 0.05). RPE data suggested that drug treatment induced an increased subjective feeling of fatigue in addition to the impaired performance, and these changes were positively related (r = 0.66, P less than 0.05). Impairment of exercise performance during acute beta-blockade is evidently not related solely to the effect on heart rate. The nature of other drug effects is presently unclear although there is evidence that the metabolic profile of the muscle is implicated.

Adrenergic beta-Antagonists↗
PubMed1988

[Sonography of the Achilles tendon and its bursa].

Pain and disturbed function in the sole of the foot leads to damage of the tendo Achilles and to abnormalities in its vicinity. They are frequent consequences of some sporting activities (jogging). Differentiation between bursitis, fat necrosis, degenerative changes in tendons and their rupture and from abnormalities of the ankle joint is important for treatment. In the symptomatic patients whom we examined, the bursa was involved in 72.9% and lesions of the tendo Achilles were found in 62.1%.

Achilles Tendon↗
PubMed1995

[Exercise-induced urticaria and anaphylaxis].

AIM: The study was designed to characterise more exactly the complex syndrome of exercise-induced urticaria and anaphylaxis in order to obtain guidelines for their management. METHODS: 30 patients (18 women and 12 men with physical exercise-induced urticaria and anaphylaxis were investigated by questionnaire. The following items were of particular interest: age and sex; age at first manifestation; type, duration and intensity of the precipitating activity; type, duration and sequence of symptoms; prophylactic or therapeutic measures as cofactors. RESULTS: Initial symptoms occurred at an average age of 22 (7-50) years. Atopy was present in 70%. Jogging (60%), ball games (40%) and walking (27%) were the most frequent precipitating activities. On each occasion symptoms began a few minutes to hours after the start of the exercise. During a typical episode an average of eight symptoms were observed, most frequently affecting the skin (pruritus, angiooedema, erythema and urticaria), dyspnoea and gastrointestinal manifestations. Syncope occurred in nine patients: before they lost consciousness they noted at least two prodromal symptoms. The most common co-factors were humid-warm weather, severe sweating and eating certain foods shortly before the exercise. Prophylactic measures were quite different between individuals. CONCLUSION: Providing detailed information on how to avoid possible cofactors and manage prodromal symptoms should be at the forefront of looking after such patients, most of whom lead a rather active life.

Adolescent↗