The Effect of Resistance Exercise Priming in the Morning on Afternoon Sprint Cross-Country Skiing Performance.

PURPOSE: We tested whether a single session of heavy-load resistance priming conducted in the morning improved double-poling (DP) performance in the afternoon. METHODS: Eight national-level male cross-country skiers (mean [SD]: 23 [3] y, 184 [6] cm, 73 [7] kg, maximum oxygen consumption = 69 [6] mL·kg-1·min-1) carried out 2 days of afternoon performance tests. In the morning, 5 hours before tests, subjects were counterbalanced to either a session of 3 × 3 repetitions (approximately 85%-90% 1-repetition maximum) of squat and sitting pullover exercises or no exercise. The performance was evaluated in DP as time to exhaustion (TTE) (approximately 3 min) on a treadmill and 30-m indoor sprints before and after TTE (30-m DP pre/post). Furthermore, submaximal DP oxygen cost, countermovement jump, and isometric knee-extension force during electrical stimulation were conducted. Participants reported perceived readiness on test days. RESULTS: Resistance exercise session versus no exercise did not differ for TTE (approximately 3 min above) (mean ± 95% confidence interval = 3.6% ± 6.0%; P = .29; effect size [ES], Cohen d = 0.27), 30-m DP pre (-0.56% ± 0.80%; P = .21; ES = 0.20), 30-m DP post (-0.18% ± 1.13%; P = .76; ES = 0.03), countermovement jump (-2.0% ± 2.8%; P = .21; ES = 0.12), DP oxygen cost (-0.13% ± 2.04%; P = .91; ES = 0.02), or perceived readiness (P ≥ .11). Electrical stimulation force was not different in contraction or relaxation time but revealed low-frequency fatigue in the afternoon for the resistance exercise session only (-12% [7%]; P = .01; ES = 1.3). CONCLUSION: A single session of heavy-load, low-volume resistance exercise in the morning did not increase afternoon DP performance of short duration in high-level skiers. However, leg low-frequency fatigue after resistance priming, together with the presence of small positive effects in 2 out of 3 DP tests, may indicate that the preconditioning was too strenuous.

Ventricular fibrillation after accidental injection of bupivacaine into the pericardium.

A postoperative cardiac surgical patient developed ventricular fibrillation immediately after accidental pericardial injection of bupivacaine at room temperature. The possible causes, which include systemic toxicity, local vasoconstriction with myocardial ischaemia, local toxic effect of bupivacaine or local hypothermia, are discussed.

Differential diagnosis of anesthesia induced rhabdomyolysis. A case report.

A four year old boy suffered from a prolonged cardiac arrest during anesthesia. Laboratory examination subsequently demonstrated extensive rhabdomyolysis. The possibility of an underlying muscle disease in this family was investigated by muscle biopsy, histological examination and in-vitro contracture testing. The latter test result was consistent with malignant hyperthermia susceptibility. This case history illustrates the differential diagnosis of anesthesia induced rhabdomyolysis.

[Infectious complications of intrauterine devices]. / Complications infectieuses sous sterilet.

PIP: 5 descriptions of uterine infections caused by an IUD are given. The symptoms are leukorrhea and metroraghia. The antibiotic treatment must be accompanied by removal of the IUD. If symptoms are ignored, the infections become worse, with serious results. 2 of the cases needed drastic surgery and another became sterile. Close surveillance is necessary to avoid such infections and to provide careful treatment if they occur. Prevention should include avoiding IUD use in those who have never given birth, or at the time of curettage.^ieng